From 4bf5d97f08e9371c99b4d7fdff16e52c82a79530 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 08:39:56 +0000 Subject: [PATCH 01/30] Initial plan From 3ccc55b51e9484e022ec5463794bbcc62d1d4298 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 08:48:13 +0000 Subject: [PATCH 02/30] feat: add unary function parsing and tree rendering support Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/1b9ad718-258f-4142-ba5d-146b7d889d15 Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- README.md | 12 +++++ canvas.js | 8 +-- index.html | 4 +- infixToPostfix.js | 130 +++++++++++++++++++++++++++++++++++++++++----- tree.js | 74 +++++++++++++++++--------- 5 files changed, 185 insertions(+), 43 deletions(-) diff --git a/README.md b/README.md index 56d4f59..eb66e8d 100644 --- a/README.md +++ b/README.md @@ -5,6 +5,18 @@ With that in mind, and inspired on my lectures on the tree data structure I deci Visit this [website](https://lnogueir.github.io/expression-tree-gen/) to simulate an expression yourself. +Supported syntax includes: +- Binary operators: `+`, `-`, `*`, `/` +- Single-letter variables: `a`-`z` +- Unary functions: `sin`, `cos`, `tan`, `log`, `ln`, `sqrt`, `exp`, `abs` + +Examples: +- `a+b` +- `sin(a)` +- `sin(a)+cos(b)` +- `sin(cos(a))` +- `sin(a+b)*cos(c)` + ## Credits: * This [article](https://llimllib.github.io/pymag-trees/) which helped me a lot introducing me to Knuth's algorithm for the layout of the tree. diff --git a/canvas.js b/canvas.js index adebbfe..9f9cd42 100644 --- a/canvas.js +++ b/canvas.js @@ -5,10 +5,11 @@ const SAMPLE_EXPRESSIONS = [ '(a + b)*c - (x - y)/z', '(a * b) - c + z / x', + 'sin(a)+cos(b)', + 'sin(a+b)*cos(c)', 'x - y + (c / (a + b))', '(a / y) + b - (c * x)', - '(a - b) * (c + d) / z', - '(a * b) - (x / y)' + '(a - b) * (c + d) / z' ] var canvas = document.querySelector('canvas') var c = canvas.getContext('2d') @@ -61,10 +62,11 @@ function displayErrorMessage() {
- You may only use these brackets ( ).
- Use * for multiplication and / for division.
+ - Supported unary functions: sin, cos, tan, log, ln, sqrt, exp, abs.
- Valid operators and operands are:
Operators: [+ - * / ]
- Operands: Any alphabetic letter. + Operands: Single letters a-z.
`, diff --git a/index.html b/index.html index 47fc397..3b7b178 100644 --- a/index.html +++ b/index.html @@ -20,7 +20,7 @@

Expression Tree Generator

Current Expression: - +
@@ -46,4 +46,4 @@

Expression Tree Generator

- \ No newline at end of file + diff --git a/infixToPostfix.js b/infixToPostfix.js index 402a6f8..3e9c48a 100644 --- a/infixToPostfix.js +++ b/infixToPostfix.js @@ -17,14 +17,100 @@ function isBracketed(expr) { return false; } -function isValidExpression(expr) { - if (expr.length < 3) { - return false; +const VARIABLES = 'abcdefghijklmnopqrstuvwxyz' +const BINARY_OPERATORS = ['*', '/', '-', '+'] +const UNARY_FUNCTIONS = ['sin', 'cos', 'tan', 'log', 'ln', 'sqrt', 'exp', 'abs'] + +function tokenize(expression) { + var tokens = [] + for (var i = 0; i < expression.length; i++) { + var current = expression[i] + if (current === ' ') { + continue + } + if (BINARY_OPERATORS.indexOf(current) !== -1 || current === '(' || current === ')') { + tokens.push(current) + continue + } + if (VARIABLES.indexOf(current) !== -1) { + var ident = current + while (i + 1 < expression.length && VARIABLES.indexOf(expression[i + 1]) !== -1) { + ident += expression[i + 1] + i++ + } + if (ident.length === 1) { + tokens.push(ident) + } else if (UNARY_FUNCTIONS.indexOf(ident) !== -1) { + tokens.push(ident) + } else { + return null + } + continue + } + return null } - for (var i = 0; i < expr.length; i++) { - if ('abcdefghijklmnopqrstuvwxyz*()/+-'.indexOf(expr[i]) === -1) { - return false; + return tokens +} + +function hasUnaryPlusOrMinus(node) { + if (!node || typeof node !== 'object') { + return false + } + if (node.type === 'OperatorNode' && (node.fn === 'unaryPlus' || node.fn === 'unaryMinus')) { + return true + } + if (node.args && node.args.length) { + for (var i = 0; i < node.args.length; i++) { + if (hasUnaryPlusOrMinus(node.args[i])) { + return true + } + } + } + if (node.content && hasUnaryPlusOrMinus(node.content)) { + return true + } + return false +} + +function isValidParsedNode(node) { + if (!node || typeof node !== 'object') { + return false + } + if (node.type === 'ParenthesisNode') { + return isValidParsedNode(node.content) + } + if (node.type === 'SymbolNode') { + return typeof node.name === 'string' && node.name.length === 1 && VARIABLES.indexOf(node.name) !== -1 + } + if (node.type === 'OperatorNode') { + if (node.implicit === true) { + return false + } + if (['add', 'subtract', 'multiply', 'divide'].indexOf(node.fn) === -1) { + return false + } + if (!node.args || node.args.length !== 2) { + return false } + return isValidParsedNode(node.args[0]) && isValidParsedNode(node.args[1]) + } + if (node.type === 'FunctionNode') { + var fnName = node.fn && node.fn.name + if (UNARY_FUNCTIONS.indexOf(fnName) === -1) { + return false + } + if (!node.args || node.args.length !== 1) { + return false + } + return isValidParsedNode(node.args[0]) + } + return false +} + +function isValidExpression(expr) { + var tokens = tokenize(expr) + if (null === tokens || tokens.length < 1) { + return false; } try { while ("(" === expr[0] && ")" === expr[expr.length - 1]) { @@ -33,7 +119,7 @@ function isValidExpression(expr) { } else break; } var res = math.parse(expr); - if ((typeof res.implicit === 'undefined') || res.fn.indexOf('unary') !== -1) { + if (hasUnaryPlusOrMinus(res) || !isValidParsedNode(res)) { return false; } return true; @@ -48,23 +134,38 @@ function infixToPostfix(expression) { return null; } const prec = { "*": 3, "/": 3, "-": 2, "+": 2, "(": 1 } - op_stack = [] - postfixList = [] - tokens = expression.split('') + var op_stack = [] + var postfixList = [] + var tokens = tokenize(expression) + if (null === tokens) { + return null + } for (const token of tokens) { - if ("abcdefghijklmnopqrstuvwxyz".indexOf(token) !== -1) { + if (VARIABLES.indexOf(token) !== -1 && token.length === 1) { postfixList.push(token) + } else if (UNARY_FUNCTIONS.indexOf(token) !== -1) { + op_stack.push(token) } else if ("(" === token) { op_stack.push(token) } else if (")" === token) { var top_op_token = op_stack.pop() while (top_op_token !== '(') { + if (typeof top_op_token === 'undefined') { + return null + } postfixList.push(top_op_token) top_op_token = op_stack.pop() } + var function_token = op_stack.slice(-1)[0] + if (UNARY_FUNCTIONS.indexOf(function_token) !== -1) { + postfixList.push(op_stack.pop()) + } } else { var peek_elem = op_stack.slice(-1)[0]; - while (op_stack.length > 0 && (prec[peek_elem] >= prec[token])) { + while ( + op_stack.length > 0 && + (UNARY_FUNCTIONS.indexOf(peek_elem) !== -1 || prec[peek_elem] >= prec[token]) + ) { postfixList.push(op_stack.pop()) peek_elem = op_stack.slice(-1)[0]; } @@ -72,7 +173,10 @@ function infixToPostfix(expression) { } } while (op_stack.length > 0) { + if (op_stack.slice(-1)[0] === '(') { + return null + } postfixList.push(op_stack.pop()) } return postfixList -} \ No newline at end of file +} diff --git a/tree.js b/tree.js index 2578aa9..f748ca2 100644 --- a/tree.js +++ b/tree.js @@ -1,6 +1,17 @@ -function Node(value) { - const radius = 32.5 +const TREE_BINARY_OPERATORS = ['*', '/', '-', '+'] +const TREE_UNARY_FUNCTIONS = ['sin', 'cos', 'tan', 'log', 'ln', 'sqrt', 'exp', 'abs'] + +function isBinaryOperator(token) { + return TREE_BINARY_OPERATORS.includes(token) +} + +function isUnaryFunction(token) { + return TREE_UNARY_FUNCTIONS.includes(token) +} + +function Node(value, arity = 0) { this.value = value; + this.arity = arity; this.x = null; this.y = null; this.right = null; @@ -8,7 +19,14 @@ function Node(value) { this.isLeaf = () => this.right == null && this.left == null; + this.getRadius = function (context) { + context.font = '25px Times New Roman' + const textWidth = context.measureText(this.value).width + return Math.max(32.5, (textWidth / 2) + 10) + } + this.drawEdge = function (context, x, y, left_way, resolve) { + const radius = this.getRadius(context) context.strokeStyle = 'gray'; context.beginPath() const x_y_ratio = Math.abs(this.y - y) / Math.abs(this.x - x) @@ -22,6 +40,7 @@ function Node(value) { } this.draw = function (context) { + const radius = this.getRadius(context) context.beginPath() context.arc(this.x, this.y, radius, 0, Math.PI * 2, false) context.fillStyle = 'white' @@ -69,33 +88,35 @@ function drawEdgeAnimated(origin_x, origin_y, destine_x, destine_y, ctx, resolve } function constructTree(postfix) { - const OPERATORS = ['*', '/', '-', '+'] var stack = [] - var root = null; - var current; - var shift = false; - for (var i = postfix.length - 1; i >= 0; i--) { - if (null === root) { - current = new Node(postfix[i]); - root = current; - } else { - if (shift) { - current.left = new Node(postfix[i]) - current = current.left - shift = false - } else { - current.right = new Node(postfix[i]) - current = current.right + for (var i = 0; i < postfix.length; i++) { + var token = postfix[i] + if (isBinaryOperator(token)) { + if (stack.length < 2) { + throw new Error('Invalid postfix expression') } - } - if (OPERATORS.includes(postfix[i])) { - stack.push(current); + var rightNode = stack.pop() + var leftNode = stack.pop() + var binaryNode = new Node(token, 2) + binaryNode.left = leftNode + binaryNode.right = rightNode + stack.push(binaryNode) + } else if (isUnaryFunction(token)) { + if (stack.length < 1) { + throw new Error('Invalid postfix expression') + } + var childNode = stack.pop() + var unaryNode = new Node(token, 1) + unaryNode.right = childNode + stack.push(unaryNode) } else { - current = stack.pop(); - shift = true + stack.push(new Node(token, 0)) } } - return root; + if (stack.length !== 1) { + throw new Error('Invalid postfix expression') + } + return stack[0]; } function getSize(root) { @@ -131,6 +152,9 @@ function setCoordinates(root) { subt.y = 1.75 * OFFSET + (depth * 1.5 * OFFSET) i++ setCoordinates(subt.right, depth + 1) + if (null == subt.left && null != subt.right) { + subt.right.x = subt.x + } } } setCoordinates(root, 0) @@ -149,4 +173,4 @@ async function drawTree(root, context) { } drawTree(root.right, context) } -} \ No newline at end of file +} From a4bc34b277497f2ba54ae358b4233c8ef7adf38a Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 08:53:08 +0000 Subject: [PATCH 03/30] chore: address validation feedback nits Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/1b9ad718-258f-4142-ba5d-146b7d889d15 Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- infixToPostfix.js | 12 ++++++------ tree.js | 2 +- 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/infixToPostfix.js b/infixToPostfix.js index 3e9c48a..5535953 100644 --- a/infixToPostfix.js +++ b/infixToPostfix.js @@ -52,7 +52,7 @@ function tokenize(expression) { return tokens } -function hasUnaryPlusOrMinus(node) { +function containsUnaryPlusOrMinus(node) { if (!node || typeof node !== 'object') { return false } @@ -61,12 +61,12 @@ function hasUnaryPlusOrMinus(node) { } if (node.args && node.args.length) { for (var i = 0; i < node.args.length; i++) { - if (hasUnaryPlusOrMinus(node.args[i])) { + if (containsUnaryPlusOrMinus(node.args[i])) { return true } } } - if (node.content && hasUnaryPlusOrMinus(node.content)) { + if (node.content && containsUnaryPlusOrMinus(node.content)) { return true } return false @@ -109,7 +109,7 @@ function isValidParsedNode(node) { function isValidExpression(expr) { var tokens = tokenize(expr) - if (null === tokens || tokens.length < 1) { + if (tokens === null || tokens.length === 0) { return false; } try { @@ -119,7 +119,7 @@ function isValidExpression(expr) { } else break; } var res = math.parse(expr); - if (hasUnaryPlusOrMinus(res) || !isValidParsedNode(res)) { + if (containsUnaryPlusOrMinus(res) || !isValidParsedNode(res)) { return false; } return true; @@ -137,7 +137,7 @@ function infixToPostfix(expression) { var op_stack = [] var postfixList = [] var tokens = tokenize(expression) - if (null === tokens) { + if (tokens === null) { return null } for (const token of tokens) { diff --git a/tree.js b/tree.js index f748ca2..57a8543 100644 --- a/tree.js +++ b/tree.js @@ -152,7 +152,7 @@ function setCoordinates(root) { subt.y = 1.75 * OFFSET + (depth * 1.5 * OFFSET) i++ setCoordinates(subt.right, depth + 1) - if (null == subt.left && null != subt.right) { + if (subt.left === null && subt.right !== null) { subt.right.x = subt.x } } From 2a2c951b3e27b3563d5f16dbc0e06a0f11a32410 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 08:59:18 +0000 Subject: [PATCH 04/30] Initial plan From 8c979219c4169c7f64e376eae9e3bc2ef2664e8d Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 09:13:52 +0000 Subject: [PATCH 05/30] Add custom # operators with inferred arity up to 3 Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/b0a59eb7-ed41-437f-beb7-60d427c204bd Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- README.md | 8 ++ canvas.js | 6 +- index.html | 2 +- infixToPostfix.js | 195 ++++++++++++++++++++++++++++++++++++++++++++-- tree.js | 161 +++++++++++++++++++++++++------------- 5 files changed, 309 insertions(+), 63 deletions(-) diff --git a/README.md b/README.md index eb66e8d..303ed94 100644 --- a/README.md +++ b/README.md @@ -9,6 +9,9 @@ Supported syntax includes: - Binary operators: `+`, `-`, `*`, `/` - Single-letter variables: `a`-`z` - Unary functions: `sin`, `cos`, `tan`, `log`, `ln`, `sqrt`, `exp`, `abs` +- Custom operators/functions: + - Arity 0: `#pi` + - Arity 1-3 (inferred): `#sign(a)`, `#add(a,b)`, `#clamp(x,a,b)` Examples: - `a+b` @@ -16,6 +19,11 @@ Examples: - `sin(a)+cos(b)` - `sin(cos(a))` - `sin(a+b)*cos(c)` +- `#pi` +- `#sign(a)` +- `#add(a,b)` +- `sin(#add(a,b))*#pi` +- `#clamp(x,a,b)` ## Credits: diff --git a/canvas.js b/canvas.js index 9f9cd42..fcf7153 100644 --- a/canvas.js +++ b/canvas.js @@ -7,6 +7,8 @@ '(a * b) - c + z / x', 'sin(a)+cos(b)', 'sin(a+b)*cos(c)', + 'sin(#add(a,b))*#pi', + '#clamp(x,#min(a,b),c)', 'x - y + (c / (a + b))', '(a / y) + b - (c * x)', '(a - b) * (c + d) / z' @@ -19,7 +21,6 @@ var expression = document.getElementById('expression-input').value if (typeof expression !== 'undefined' && null != expression) { expression = expression.replace(/\s+/g, '') - expression = expression.toLowerCase() var postfix = infixToPostfix(expression); if (null !== postfix) { try { @@ -63,10 +64,11 @@ function displayErrorMessage() { - You may only use these brackets ( ).
- Use * for multiplication and / for division.
- Supported unary functions: sin, cos, tan, log, ln, sqrt, exp, abs.
+ - Custom operators: #name, #name(arg), #name(arg1,arg2,arg3) (max arity 3).
- Valid operators and operands are:
Operators: [+ - * / ]
- Operands: Single letters a-z. + Operands: Single letters a-z and custom operators.
`, diff --git a/index.html b/index.html index 3b7b178..75a39a2 100644 --- a/index.html +++ b/index.html @@ -20,7 +20,7 @@

Expression Tree Generator

Current Expression: - +
diff --git a/infixToPostfix.js b/infixToPostfix.js index 5535953..ba73301 100644 --- a/infixToPostfix.js +++ b/infixToPostfix.js @@ -20,6 +20,29 @@ function isBracketed(expr) { const VARIABLES = 'abcdefghijklmnopqrstuvwxyz' const BINARY_OPERATORS = ['*', '/', '-', '+'] const UNARY_FUNCTIONS = ['sin', 'cos', 'tan', 'log', 'ln', 'sqrt', 'exp', 'abs'] +const CUSTOM_IDENTIFIER_START = /[A-Za-z_]/ +const CUSTOM_IDENTIFIER_BODY = /[A-Za-z0-9_]/ +const ALLOWED_CHARACTERS_REGEX = /^[A-Za-z0-9_#,+\-*/()\s]*$/ + +function isCustomToken(token) { + return token && typeof token === 'object' && token.type === 'custom' && typeof token.name === 'string' +} + +function createCustomToken(name, arity) { + var token = { type: 'custom', name: name } + if (typeof arity === 'number') { + token.arity = arity + } + return token +} + +function isFunctionToken(token) { + return UNARY_FUNCTIONS.indexOf(token) !== -1 || isCustomToken(token) +} + +function isVariableToken(token) { + return typeof token === 'string' && token.length === 1 && VARIABLES.indexOf(token) !== -1 +} function tokenize(expression) { var tokens = [] @@ -32,6 +55,23 @@ function tokenize(expression) { tokens.push(current) continue } + if (current === ',') { + tokens.push(current) + continue + } + if (current === '#') { + if (i + 1 >= expression.length || !CUSTOM_IDENTIFIER_START.test(expression[i + 1])) { + return null + } + var customName = expression[i + 1] + i++ + while (i + 1 < expression.length && CUSTOM_IDENTIFIER_BODY.test(expression[i + 1])) { + customName += expression[i + 1] + i++ + } + tokens.push(createCustomToken(customName)) + continue + } if (VARIABLES.indexOf(current) !== -1) { var ident = current while (i + 1 < expression.length && VARIABLES.indexOf(expression[i + 1]) !== -1) { @@ -52,6 +92,107 @@ function tokenize(expression) { return tokens } +function isStopToken(token, stopOnComma) { + return typeof token === 'undefined' || token === ')' || (stopOnComma && token === ',') +} + +function parsePrimary(tokens, index, stopOnComma) { + var token = tokens[index] + if (isStopToken(token, stopOnComma)) { + return null + } + if (isVariableToken(token)) { + return { nextIndex: index + 1 } + } + if (token === '(') { + var grouped = parseAddSubtract(tokens, index + 1, stopOnComma) + if (!grouped || tokens[grouped.nextIndex] !== ')') { + return null + } + return { nextIndex: grouped.nextIndex + 1 } + } + if (UNARY_FUNCTIONS.indexOf(token) !== -1) { + if (tokens[index + 1] !== '(') { + return null + } + var unaryArg = parseAddSubtract(tokens, index + 2, false) + if (!unaryArg || tokens[unaryArg.nextIndex] !== ')') { + return null + } + return { nextIndex: unaryArg.nextIndex + 1 } + } + if (isCustomToken(token)) { + if (tokens[index + 1] !== '(') { + return { nextIndex: index + 1 } + } + var argsIndex = index + 2 + if (tokens[argsIndex] === ')') { + return null + } + var arity = 0 + while (true) { + var arg = parseAddSubtract(tokens, argsIndex, true) + if (!arg) { + return null + } + arity++ + if (arity > 3) { + return null + } + argsIndex = arg.nextIndex + if (tokens[argsIndex] === ',') { + argsIndex++ + if (tokens[argsIndex] === ')' || typeof tokens[argsIndex] === 'undefined') { + return null + } + continue + } + if (tokens[argsIndex] === ')') { + return { nextIndex: argsIndex + 1 } + } + return null + } + } + return null +} + +function parseMultiplyDivide(tokens, index, stopOnComma) { + var left = parsePrimary(tokens, index, stopOnComma) + if (!left) { + return null + } + var i = left.nextIndex + while (tokens[i] === '*' || tokens[i] === '/') { + var right = parsePrimary(tokens, i + 1, stopOnComma) + if (!right) { + return null + } + i = right.nextIndex + } + return { nextIndex: i } +} + +function parseAddSubtract(tokens, index, stopOnComma) { + var left = parseMultiplyDivide(tokens, index, stopOnComma) + if (!left) { + return null + } + var i = left.nextIndex + while (tokens[i] === '+' || tokens[i] === '-') { + var right = parseMultiplyDivide(tokens, i + 1, stopOnComma) + if (!right) { + return null + } + i = right.nextIndex + } + return { nextIndex: i } +} + +function isValidCustomExpression(tokens) { + var parsed = parseAddSubtract(tokens, 0, false) + return !!parsed && parsed.nextIndex === tokens.length +} + function containsUnaryPlusOrMinus(node) { if (!node || typeof node !== 'object') { return false @@ -108,10 +249,17 @@ function isValidParsedNode(node) { } function isValidExpression(expr) { + if (!ALLOWED_CHARACTERS_REGEX.test(expr)) { + return false + } var tokens = tokenize(expr) if (tokens === null || tokens.length === 0) { return false; } + var hasCustom = tokens.some(function (token) { return isCustomToken(token) }) + if (hasCustom) { + return isValidCustomExpression(tokens) + } try { while ("(" === expr[0] && ")" === expr[expr.length - 1]) { if (isBracketed(expr)) { @@ -135,18 +283,43 @@ function infixToPostfix(expression) { } const prec = { "*": 3, "/": 3, "-": 2, "+": 2, "(": 1 } var op_stack = [] + var customCallStack = [] var postfixList = [] var tokens = tokenize(expression) if (tokens === null) { return null } - for (const token of tokens) { - if (VARIABLES.indexOf(token) !== -1 && token.length === 1) { + for (var i = 0; i < tokens.length; i++) { + var token = tokens[i] + if (isVariableToken(token)) { postfixList.push(token) + } else if (isCustomToken(token)) { + if (tokens[i + 1] === '(') { + op_stack.push(token) + } else { + postfixList.push(createCustomToken(token.name, 0)) + } } else if (UNARY_FUNCTIONS.indexOf(token) !== -1) { op_stack.push(token) } else if ("(" === token) { + if (isCustomToken(tokens[i - 1])) { + customCallStack.push({ token: tokens[i - 1], commaCount: 0 }) + } op_stack.push(token) + } else if ("," === token) { + var commaTop = op_stack.pop() + while (commaTop !== '(') { + if (typeof commaTop === 'undefined') { + return null + } + postfixList.push(commaTop) + commaTop = op_stack.pop() + } + op_stack.push('(') + if (customCallStack.length === 0) { + return null + } + customCallStack[customCallStack.length - 1].commaCount++ } else if (")" === token) { var top_op_token = op_stack.pop() while (top_op_token !== '(') { @@ -157,14 +330,23 @@ function infixToPostfix(expression) { top_op_token = op_stack.pop() } var function_token = op_stack.slice(-1)[0] - if (UNARY_FUNCTIONS.indexOf(function_token) !== -1) { - postfixList.push(op_stack.pop()) + if (isFunctionToken(function_token)) { + var emittedFunction = op_stack.pop() + if (isCustomToken(emittedFunction)) { + var customFrame = customCallStack.pop() + if (!customFrame || customFrame.token !== emittedFunction) { + return null + } + postfixList.push(createCustomToken(emittedFunction.name, customFrame.commaCount + 1)) + } else { + postfixList.push(emittedFunction) + } } } else { var peek_elem = op_stack.slice(-1)[0]; while ( op_stack.length > 0 && - (UNARY_FUNCTIONS.indexOf(peek_elem) !== -1 || prec[peek_elem] >= prec[token]) + (isFunctionToken(peek_elem) || prec[peek_elem] >= prec[token]) ) { postfixList.push(op_stack.pop()) peek_elem = op_stack.slice(-1)[0]; @@ -176,6 +358,9 @@ function infixToPostfix(expression) { if (op_stack.slice(-1)[0] === '(') { return null } + if (isCustomToken(op_stack.slice(-1)[0])) { + return null + } postfixList.push(op_stack.pop()) } return postfixList diff --git a/tree.js b/tree.js index 57a8543..2bc781a 100644 --- a/tree.js +++ b/tree.js @@ -9,15 +9,51 @@ function isUnaryFunction(token) { return TREE_UNARY_FUNCTIONS.includes(token) } -function Node(value, arity = 0) { +function isCustomToken(token) { + return token && typeof token === 'object' && token.type === 'custom' && typeof token.name === 'string' +} + +function getTokenArity(token) { + if (isBinaryOperator(token)) { + return 2 + } + if (isUnaryFunction(token)) { + return 1 + } + if (isCustomToken(token)) { + return token.arity || 0 + } + return 0 +} + +function getTokenLabel(token) { + if (isCustomToken(token)) { + return '#' + token.name + } + return token +} + +function Node(value, arity = 0, children = []) { this.value = value; this.arity = arity; this.x = null; this.y = null; - this.right = null; - this.left = null; + this.children = children; + + Object.defineProperty(this, 'left', { + get: () => this.children[0] || null, + set: (node) => { + this.children[0] = node + } + }) + Object.defineProperty(this, 'right', { + get: () => this.children[1] || null, + set: (node) => { + this.children[1] = node + } + }) - this.isLeaf = () => this.right == null && this.left == null; + this.isLeaf = () => this.children.length === 0; this.getRadius = function (context) { context.font = '25px Times New Roman' @@ -25,18 +61,22 @@ function Node(value, arity = 0) { return Math.max(32.5, (textWidth / 2) + 10) } - this.drawEdge = function (context, x, y, left_way, resolve) { + this.drawEdge = function (context, childNode, resolve) { const radius = this.getRadius(context) + const childRadius = childNode.getRadius(context) context.strokeStyle = 'gray'; - context.beginPath() - const x_y_ratio = Math.abs(this.y - y) / Math.abs(this.x - x) - const w = radius * Math.sqrt(1 / (1 + Math.pow(x_y_ratio, 2))) - const d = x_y_ratio * w - if (left_way) { - drawEdgeAnimated(this.x - w, this.y + d, x + w, y - d, context, resolve) - } else { - drawEdgeAnimated(this.x + w, this.y + d, x - w, y - d, context, resolve) + const dx = childNode.x - this.x + const dy = childNode.y - this.y + const distance = Math.sqrt((dx * dx) + (dy * dy)) + if (distance === 0) { + resolve() + return } + const startX = this.x + (dx / distance) * radius + const startY = this.y + (dy / distance) * radius + const endX = childNode.x - (dx / distance) * childRadius + const endY = childNode.y - (dy / distance) * childRadius + drawEdgeAnimated(startX, startY, endX, endY, context, resolve) } this.draw = function (context) { @@ -91,26 +131,15 @@ function constructTree(postfix) { var stack = [] for (var i = 0; i < postfix.length; i++) { var token = postfix[i] - if (isBinaryOperator(token)) { - if (stack.length < 2) { - throw new Error('Invalid postfix expression') - } - var rightNode = stack.pop() - var leftNode = stack.pop() - var binaryNode = new Node(token, 2) - binaryNode.left = leftNode - binaryNode.right = rightNode - stack.push(binaryNode) - } else if (isUnaryFunction(token)) { - if (stack.length < 1) { + var arity = getTokenArity(token) + if (arity === 0) { + stack.push(new Node(getTokenLabel(token), 0, [])) + } else { + if (stack.length < arity) { throw new Error('Invalid postfix expression') } - var childNode = stack.pop() - var unaryNode = new Node(token, 1) - unaryNode.right = childNode - stack.push(unaryNode) - } else { - stack.push(new Node(token, 0)) + var children = stack.splice(stack.length - arity, arity) + stack.push(new Node(getTokenLabel(token), arity, children)) } } if (stack.length !== 1) { @@ -124,8 +153,9 @@ function getSize(root) { function countSize(root) { if (null != root) { size++; - countSize(root.left) - countSize(root.right) + for (var i = 0; i < root.children.length; i++) { + countSize(root.children[i]) + } } } countSize(root); @@ -134,43 +164,64 @@ function getSize(root) { function print_coords(root) { if (null != root) { - print_coords(root.left) console.log(root.value, root.x, root.y) - print_coords(root.right) + for (var i = 0; i < root.children.length; i++) { + print_coords(root.children[i]) + } } } function setCoordinates(root) { - var i = 0 const OFFSET = 50 - const size = getSize(root) + if (null == root) { + return + } + + function getLeafCount(node) { + if (node.children.length === 0) { + node.leafCount = 1 + return 1 + } + var leaves = 0 + for (var j = 0; j < node.children.length; j++) { + leaves += getLeafCount(node.children[j]) + } + node.leafCount = leaves + return leaves + } + + const size = getLeafCount(root) const canvas_mid_point = window.innerWidth / 2; - function setCoordinates(subt, depth) { - if (null != subt) { - setCoordinates(subt.left, depth + 1) - subt.x = canvas_mid_point + (OFFSET * (i - size / 2)) - subt.y = 1.75 * OFFSET + (depth * 1.5 * OFFSET) - i++ - setCoordinates(subt.right, depth + 1) - if (subt.left === null && subt.right !== null) { - subt.right.x = subt.x - } + function assignCoordinates(node, depth, startX, endX) { + node.x = (startX + endX) / 2 + node.y = 1.75 * OFFSET + (depth * 1.5 * OFFSET) + if (node.children.length === 0) { + return + } + var totalLeaves = 0 + for (var i = 0; i < node.children.length; i++) { + totalLeaves += node.children[i].leafCount + } + var currentX = startX + for (var childIndex = 0; childIndex < node.children.length; childIndex++) { + var child = node.children[childIndex] + var width = (endX - startX) * (child.leafCount / totalLeaves) + assignCoordinates(child, depth + 1, currentX, currentX + width) + currentX += width } } - setCoordinates(root, 0) + var totalWidth = size * OFFSET + assignCoordinates(root, 0, canvas_mid_point - (totalWidth / 2), canvas_mid_point + (totalWidth / 2)) } // must be async in order to await till animation is done async function drawTree(root, context) { if (null != root) { root.draw(context) - if (null != root.left) { - await new Promise(resolve => root.drawEdge(context, root.left.x, root.left.y, true, resolve)) - } - drawTree(root.left, context) - if (null != root.right) { - await new Promise(resolve => root.drawEdge(context, root.right.x, root.right.y, false, resolve)) + for (var i = 0; i < root.children.length; i++) { + var child = root.children[i] + await new Promise(resolve => root.drawEdge(context, child, resolve)) + await drawTree(child, context) } - drawTree(root.right, context) } } From b9bd5204ca9a9a3e102bd45d0e07a64d6a4c570a Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 09:21:39 +0000 Subject: [PATCH 06/30] Address review nits and finalize custom operator support Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/b0a59eb7-ed41-437f-beb7-60d427c204bd Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- infixToPostfix.js | 12 ++++++------ tree.js | 21 +++++++++++++-------- 2 files changed, 19 insertions(+), 14 deletions(-) diff --git a/infixToPostfix.js b/infixToPostfix.js index ba73301..4e4077b 100644 --- a/infixToPostfix.js +++ b/infixToPostfix.js @@ -142,7 +142,7 @@ function parsePrimary(tokens, index, stopOnComma) { argsIndex = arg.nextIndex if (tokens[argsIndex] === ',') { argsIndex++ - if (tokens[argsIndex] === ')' || typeof tokens[argsIndex] === 'undefined') { + if (isStopToken(tokens[argsIndex], false)) { return null } continue @@ -256,8 +256,8 @@ function isValidExpression(expr) { if (tokens === null || tokens.length === 0) { return false; } - var hasCustom = tokens.some(function (token) { return isCustomToken(token) }) - if (hasCustom) { + var hasCustomToken = tokens.some(function (token) { return isCustomToken(token) }) + if (hasCustomToken) { return isValidCustomExpression(tokens) } try { @@ -302,8 +302,8 @@ function infixToPostfix(expression) { } else if (UNARY_FUNCTIONS.indexOf(token) !== -1) { op_stack.push(token) } else if ("(" === token) { - if (isCustomToken(tokens[i - 1])) { - customCallStack.push({ token: tokens[i - 1], commaCount: 0 }) + if (i > 0 && isCustomToken(tokens[i - 1])) { + customCallStack.push({ name: tokens[i - 1].name, commaCount: 0 }) } op_stack.push(token) } else if ("," === token) { @@ -334,7 +334,7 @@ function infixToPostfix(expression) { var emittedFunction = op_stack.pop() if (isCustomToken(emittedFunction)) { var customFrame = customCallStack.pop() - if (!customFrame || customFrame.token !== emittedFunction) { + if (!customFrame || customFrame.name !== emittedFunction.name) { return null } postfixList.push(createCustomToken(emittedFunction.name, customFrame.commaCount + 1)) diff --git a/tree.js b/tree.js index 2bc781a..1328565 100644 --- a/tree.js +++ b/tree.js @@ -33,23 +33,28 @@ function getTokenLabel(token) { return token } -function Node(value, arity = 0, children = []) { +function Node(value, arity = 0, children) { + var self = this this.value = value; this.arity = arity; this.x = null; this.y = null; - this.children = children; + this.children = children || []; Object.defineProperty(this, 'left', { - get: () => this.children[0] || null, - set: (node) => { - this.children[0] = node + get: function () { + return self.children[0] || null + }, + set: function (node) { + self.children[0] = node } }) Object.defineProperty(this, 'right', { - get: () => this.children[1] || null, - set: (node) => { - this.children[1] = node + get: function () { + return self.children[1] || null + }, + set: function (node) { + self.children[1] = node } }) From bf0c48cc83a69e843b2f206b86dd971100405142 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 09:28:04 +0000 Subject: [PATCH 07/30] Hide # prefix in node labels, fix font scaling, improve spacing Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/9641a83b-5b89-4e77-8331-bbb358b7a92e Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- tree.js | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-) diff --git a/tree.js b/tree.js index 1328565..e023ed6 100644 --- a/tree.js +++ b/tree.js @@ -28,7 +28,7 @@ function getTokenArity(token) { function getTokenLabel(token) { if (isCustomToken(token)) { - return '#' + token.name + return token.name } return token } @@ -61,9 +61,19 @@ function Node(value, arity = 0, children) { this.isLeaf = () => this.children.length === 0; this.getRadius = function (context) { - context.font = '25px Times New Roman' + return 32.5 + } + + this.getFontSize = function (context) { + const baseSize = 25 + const radius = this.getRadius(context) + const maxTextWidth = (radius - 6) * 2 + context.font = baseSize + 'px Times New Roman' const textWidth = context.measureText(this.value).width - return Math.max(32.5, (textWidth / 2) + 10) + if (textWidth <= maxTextWidth) { + return baseSize + } + return Math.max(8, Math.floor(baseSize * (maxTextWidth / textWidth))) } this.drawEdge = function (context, childNode, resolve) { @@ -92,7 +102,8 @@ function Node(value, arity = 0, children) { context.fill() context.strokeStyle = '#212121' context.stroke() - context.font = '25px Times New Roman' + const fontSize = this.getFontSize(context) + context.font = fontSize + 'px Times New Roman' context.textAlign = 'center' context.textBaseline = 'middle' context.fillStyle = "#212121"; @@ -178,6 +189,7 @@ function print_coords(root) { function setCoordinates(root) { const OFFSET = 50 + const HORIZONTAL_SPACING = 80 if (null == root) { return } @@ -215,7 +227,7 @@ function setCoordinates(root) { currentX += width } } - var totalWidth = size * OFFSET + var totalWidth = size * HORIZONTAL_SPACING assignCoordinates(root, 0, canvas_mid_point - (totalWidth / 2), canvas_mid_point + (totalWidth / 2)) } From f1167f8e48a6b95a9f0d57f88154d2ae8032c6a7 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 09:41:54 +0000 Subject: [PATCH 08/30] Initial plan From d3dc64b6543f02eec562348ad8253022b9f3f3f5 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 09:48:41 +0000 Subject: [PATCH 09/30] feat: add export png control enter-to-generate and animation toggle Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/9d244446-6338-4b90-b8b0-d1dc770c4140 Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- app.css | 12 +++++++++++- canvas.js | 31 ++++++++++++++++++++++++++++++- index.html | 12 ++++++++++++ tree.js | 18 +++++++++++++----- 4 files changed, 66 insertions(+), 7 deletions(-) diff --git a/app.css b/app.css index e697ba4..0e60644 100644 --- a/app.css +++ b/app.css @@ -82,12 +82,22 @@ flex-direction: row; justify-content: center; align-items: center; + flex-wrap: wrap; + row-gap: 10px; } .buttons > * { margin-right: 15px; } + .bg-mode-label, + .animate-toggle-label{ + color: #e0e0e0; + display: inline-flex; + align-items: center; + gap: 6px; + } + .contact-section button{ margin-bottom: 20px; outline: none; @@ -208,4 +218,4 @@ canvas{ border: 1px solid lightgray; width: 100%; height: 100%; -} \ No newline at end of file +} diff --git a/canvas.js b/canvas.js index fcf7153..0c54a65 100644 --- a/canvas.js +++ b/canvas.js @@ -16,6 +16,26 @@ var canvas = document.querySelector('canvas') var c = canvas.getContext('2d') function clearCanvas() { c.clearRect(0, 0, canvas.width, canvas.height) } + function exportCanvas() { + var bgMode = document.getElementById('export-bg-mode').value + var dataURL + if (bgMode === 'white') { + var exportCanvas = document.createElement('canvas') + var exportContext = exportCanvas.getContext('2d') + exportCanvas.width = canvas.width + exportCanvas.height = canvas.height + exportContext.fillStyle = '#ffffff' + exportContext.fillRect(0, 0, exportCanvas.width, exportCanvas.height) + exportContext.drawImage(canvas, 0, 0) + dataURL = exportCanvas.toDataURL('image/png') + } else { + dataURL = canvas.toDataURL('image/png') + } + var link = document.createElement('a') + link.href = dataURL + link.download = 'expression-tree.png' + link.click() + } document.getElementById('generate-tree').addEventListener('click', () => { var expression = document.getElementById('expression-input').value @@ -29,7 +49,7 @@ clearCanvas() canvas.height = document.getElementById('canvas-container').offsetHeight; canvas.width = document.getElementById('canvas-container').offsetWidth; - drawTree(root, c) + drawTree(root, c, document.getElementById('animate-toggle').checked) } catch (e) { displayErrorMessage() } @@ -47,6 +67,15 @@ clearCanvas() }) + document.getElementById('export-tree').addEventListener('click', exportCanvas) + + document.getElementById('expression-input').addEventListener('keydown', (e) => { + if (e.key === 'Enter') { + e.preventDefault() + document.getElementById('generate-tree').click() + } + }) + document.getElementById('expression-input').value = SAMPLE_EXPRESSIONS[Math.floor(Math.random() * SAMPLE_EXPRESSIONS.length)] setTimeout(() => { document.getElementById('generate-tree').click() diff --git a/index.html b/index.html index 75a39a2..5a68624 100644 --- a/index.html +++ b/index.html @@ -26,6 +26,18 @@

Expression Tree Generator

+ + +
diff --git a/tree.js b/tree.js index e023ed6..298087f 100644 --- a/tree.js +++ b/tree.js @@ -76,7 +76,7 @@ function Node(value, arity = 0, children) { return Math.max(8, Math.floor(baseSize * (maxTextWidth / textWidth))) } - this.drawEdge = function (context, childNode, resolve) { + this.drawEdge = function (context, childNode, resolve, animate) { const radius = this.getRadius(context) const childRadius = childNode.getRadius(context) context.strokeStyle = 'gray'; @@ -91,7 +91,15 @@ function Node(value, arity = 0, children) { const startY = this.y + (dy / distance) * radius const endX = childNode.x - (dx / distance) * childRadius const endY = childNode.y - (dy / distance) * childRadius - drawEdgeAnimated(startX, startY, endX, endY, context, resolve) + if (animate) { + drawEdgeAnimated(startX, startY, endX, endY, context, resolve) + } else { + context.beginPath() + context.moveTo(startX, startY) + context.lineTo(endX, endY) + context.stroke() + resolve() + } } this.draw = function (context) { @@ -232,13 +240,13 @@ function setCoordinates(root) { } // must be async in order to await till animation is done -async function drawTree(root, context) { +async function drawTree(root, context, animate = true) { if (null != root) { root.draw(context) for (var i = 0; i < root.children.length; i++) { var child = root.children[i] - await new Promise(resolve => root.drawEdge(context, child, resolve)) - await drawTree(child, context) + await new Promise(resolve => root.drawEdge(context, child, resolve, animate)) + await drawTree(child, context, animate) } } } From 555323ede4ca8a6dcb20a04070b5ba94c4abcb41 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 09:58:23 +0000 Subject: [PATCH 10/30] Initial plan From 7865c16b8042406ca82d3a28b273ce3ddc90de75 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 10:05:25 +0000 Subject: [PATCH 11/30] feat: implement minimal realtime UI with dark mode and sync tree rendering Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/e008f843-b6be-49f2-867a-0a32bd59bc0a Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- app.css | 332 +++++++++++++++++++++-------------------------------- canvas.js | 184 +++++++++++++++++------------ index.html | 91 ++++++++------- tree.js | 73 ++++-------- 4 files changed, 313 insertions(+), 367 deletions(-) diff --git a/app.css b/app.css index 0e60644..211a9af 100644 --- a/app.css +++ b/app.css @@ -1,221 +1,149 @@ -*{ +* { + box-sizing: border-box; margin: 0; padding: 0; - box-sizing: border-box; - font-family: avenir, 'Century Gothic'; - } - .contact-section{ - background-color: #828282; - background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 2000 1500'%3E%3Cdefs%3E%3CradialGradient id='a' gradientUnits='objectBoundingBox'%3E%3Cstop offset='0' stop-color='%23ffffff'/%3E%3Cstop offset='1' stop-color='%23828282'/%3E%3C/radialGradient%3E%3ClinearGradient id='b' gradientUnits='userSpaceOnUse' x1='0' y1='750' x2='1550' y2='750'%3E%3Cstop offset='0' stop-color='%23c1c1c1'/%3E%3Cstop offset='1' stop-color='%23828282'/%3E%3C/linearGradient%3E%3Cpath id='s' fill='url(%23b)' d='M1549.2 51.6c-5.4 99.1-20.2 197.6-44.2 293.6c-24.1 96-57.4 189.4-99.3 278.6c-41.9 89.2-92.4 174.1-150.3 253.3c-58 79.2-123.4 152.6-195.1 219c-71.7 66.4-149.6 125.8-232.2 177.2c-82.7 51.4-170.1 94.7-260.7 129.1c-90.6 34.4-184.4 60-279.5 76.3C192.6 1495 96.1 1502 0 1500c96.1-2.1 191.8-13.3 285.4-33.6c93.6-20.2 185-49.5 272.5-87.2c87.6-37.7 171.3-83.8 249.6-137.3c78.4-53.5 151.5-114.5 217.9-181.7c66.5-67.2 126.4-140.7 178.6-218.9c52.3-78.3 96.9-161.4 133-247.9c36.1-86.5 63.8-176.2 82.6-267.6c18.8-91.4 28.6-184.4 29.6-277.4c0.3-27.6 23.2-48.7 50.8-48.4s49.5 21.8 49.2 49.5c0 0.7 0 1.3-0.1 2L1549.2 51.6z'/%3E%3Cg id='g'%3E%3Cuse href='%23s' transform='scale(0.12) rotate(60)'/%3E%3Cuse href='%23s' transform='scale(0.2) rotate(10)'/%3E%3Cuse href='%23s' transform='scale(0.25) rotate(40)'/%3E%3Cuse href='%23s' transform='scale(0.3) rotate(-20)'/%3E%3Cuse href='%23s' transform='scale(0.4) rotate(-30)'/%3E%3Cuse href='%23s' transform='scale(0.5) rotate(20)'/%3E%3Cuse href='%23s' transform='scale(0.6) rotate(60)'/%3E%3Cuse href='%23s' transform='scale(0.7) rotate(10)'/%3E%3Cuse href='%23s' transform='scale(0.835) rotate(-40)'/%3E%3Cuse href='%23s' transform='scale(0.9) rotate(40)'/%3E%3Cuse href='%23s' transform='scale(1.05) rotate(25)'/%3E%3Cuse href='%23s' transform='scale(1.2) rotate(8)'/%3E%3Cuse href='%23s' transform='scale(1.333) rotate(-60)'/%3E%3Cuse href='%23s' transform='scale(1.45) rotate(-30)'/%3E%3Cuse href='%23s' transform='scale(1.6) rotate(10)'/%3E%3C/g%3E%3C/defs%3E%3Cg transform='translate(2000 0)'%3E%3Cg transform='translate(0 405)'%3E%3Ccircle fill='url(%23a)' r='3000'/%3E%3Cg opacity='0.5'%3E%3Ccircle fill='url(%23a)' r='2000'/%3E%3Ccircle fill='url(%23a)' r='1800'/%3E%3Ccircle fill='url(%23a)' r='1700'/%3E%3Ccircle fill='url(%23a)' r='1651'/%3E%3Ccircle fill='url(%23a)' r='1450'/%3E%3Ccircle fill='url(%23a)' r='1250'/%3E%3Ccircle fill='url(%23a)' r='1175'/%3E%3Ccircle fill='url(%23a)' r='900'/%3E%3Ccircle fill='url(%23a)' r='750'/%3E%3Ccircle fill='url(%23a)' r='500'/%3E%3Ccircle fill='url(%23a)' r='380'/%3E%3Ccircle fill='url(%23a)' r='250'/%3E%3C/g%3E%3Cg transform='rotate(-201.6 0 0)'%3E%3Cuse href='%23g' transform='rotate(10)'/%3E%3Cuse href='%23g' transform='rotate(120)'/%3E%3Cuse href='%23g' transform='rotate(240)'/%3E%3C/g%3E%3Ccircle fill-opacity='0' fill='url(%23a)' r='3000'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E"); - background-attachment: fixed; - background-size: cover; - padding: 60px 0 40px 0; - text-align: center; - } - - .inner-input-container{ - text-align: left; - } - - .inner-input-container > span{ - position: relative; - left: 6px; - color: #e0e0e0; - font-size:20px; - } - - .github-link{ - position: absolute; - right: 35px; - top: 330px; - } - - .github-link > img{ - height: 70px; - background: white; - padding: 15px; - box-shadow: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23); - transition: all 0.3s cubic-bezier(.25,.8,.25,1); - border-radius: 60px; - } - - .github-link > img:hover{ - box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23); - } - - - - .inner-width{ - max-width: 600px; - margin: auto; - padding: 0 20px; - } - - .contact-section h1{ - font-size:30px; - color: #FFF; - margin-bottom: 40px; - text-transform: uppercase; - letter-spacing: 4px; - font-weight: 400; - } - - - .name,.email,.message{ - background: none; - border:none; - outline: none; - border-bottom: 1px solid; - color: #FFF; - padding: 10px 6px; - font-size: 24px; - margin-bottom: 40px; - } - - .name{ - float: center; - width: 540px; - } - - .buttons{ - display: flex; - flex-direction: row; - justify-content: center; - align-items: center; - flex-wrap: wrap; - row-gap: 10px; - } - - .buttons > * { - margin-right: 15px; - } - - .bg-mode-label, - .animate-toggle-label{ - color: #e0e0e0; - display: inline-flex; - align-items: center; - gap: 6px; - } - - .contact-section button{ - margin-bottom: 20px; - outline: none; - background: none; - color: #fafafa; - border: 1px solid #e0e0e0; - padding: 12px 40px; - border-radius: 8px; - text-transform: uppercase; - font-size: 14px; - transition: 0.4s linear; - cursor: pointer; - } - - .contact-section button:hover{ - background: #fafafa; - color: #212121; - } - - .ending-section{ - z-index: 10; - bottom: 0; - position: relative; - background: #001f3f; - padding: 80px 0; - text-align: center; - } - - .end-row{ - display: flex; - flex-direction: row; - align-items: center; - justify-content: space-between; - margin: auto; - color: white; - } - - .end-1-text{ - display: flex; - flex-direction: column; - justify-content: center; - align-items: center; - } - - .end-1-text h4{ - font-weight: 400; - padding: 0 0 .25rem 0; - } - - .end-1-text p{ - font-size: 10px; - width: 75%; - } - - .end-2-text p a{ - text-decoration: none; - color: #FFF; -} - -body{ - margin:0; -} - - .end-1{ - flex: 1; - } - - .end-2-text{ + font-family: avenir, 'Century Gothic', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; +} + +:root { + --bg: #ffffff; + --fg: #212121; + --muted: #9e9e9e; + --node-fill: #ffffff; + --node-stroke: #212121; + --edge: #9e9e9e; + --input-border: #212121; +} + +[data-theme="dark"] { + --bg: #121212; + --fg: #e0e0e0; + --muted: #6b6b6b; + --node-fill: #1e1e1e; + --node-stroke: #e0e0e0; + --edge: #6b6b6b; + --input-border: #e0e0e0; +} + +html, +body { + width: 100%; + height: 100%; +} + +body { + background: var(--bg); + color: var(--fg); +} + +.app { + min-height: 100vh; display: flex; flex-direction: column; - justify-content: center; align-items: center; } -.end-2-text h4{ - padding: 0 0 .25rem 0; - font-weight: 400; +.controls { + width: min(720px, calc(100vw - 2rem)); + margin: 1.25rem auto 0; + display: flex; + flex-direction: column; + align-items: center; + gap: 0.65rem; } -.end-2-text p{ - font-size: 10px; - width: 75%; +.input-wrap { + width: 100%; + position: relative; } -.end-2{ - flex: 1; -} - - @media screen and (max-width:700px){ - .contact-section{ - background: #001f3f; - } - } - - - @media screen and (max-width:600px){ - .name,.email{ - width: 100%; - } - } - -#canvas-container{ +#expression-input { + width: 100%; + border: 1px solid var(--input-border); + border-radius: 10px; + background: transparent; + color: var(--fg); + padding: 0.8rem 5rem 0.8rem 0.85rem; + font-size: 1rem; outline: none; +} + +#expression-input::placeholder { + color: var(--muted); +} + +.warning { + position: absolute; + right: 3rem; + top: 50%; + transform: translateY(-50%); + font-size: 1rem; + line-height: 1; +} + +.icon-btn { border: none; - display: flex; - flex-direction: column; + background: transparent; + color: var(--fg); + display: inline-flex; align-items: center; - margin: auto; - height: 100vh; - width: 100vw; - max-width: 100vw; - background: #FFF; - background-color: #ffffff; - background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='328' height='328' viewBox='0 0 800 800'%3E%3Cg fill='none' stroke='%23e8e8e8' stroke-width='1.7'%3E%3Cpath d='M769 229L1037 260.9M927 880L731 737 520 660 309 538 40 599 295 764 126.5 879.5 40 599-197 493 102 382-31 229 126.5 79.5-69-63'/%3E%3Cpath d='M-31 229L237 261 390 382 603 493 308.5 537.5 101.5 381.5M370 905L295 764'/%3E%3Cpath d='M520 660L578 842 731 737 840 599 603 493 520 660 295 764 309 538 390 382 539 269 769 229 577.5 41.5 370 105 295 -36 126.5 79.5 237 261 102 382 40 599 -69 737 127 880'/%3E%3Cpath d='M520-140L578.5 42.5 731-63M603 493L539 269 237 261 370 105M902 382L539 269M390 382L102 382'/%3E%3Cpath d='M-222 42L126.5 79.5 370 105 539 269 577.5 41.5 927 80 769 229 902 382 603 493 731 737M295-36L577.5 41.5M578 842L295 764M40-201L127 80M102 382L-261 269'/%3E%3C/g%3E%3Cg fill='%23d9d9d9'%3E%3Ccircle cx='769' cy='229' r='7'/%3E%3Ccircle cx='539' cy='269' r='7'/%3E%3Ccircle cx='603' cy='493' r='7'/%3E%3Ccircle cx='731' cy='737' r='7'/%3E%3Ccircle cx='520' cy='660' r='7'/%3E%3Ccircle cx='309' cy='538' r='7'/%3E%3Ccircle cx='295' cy='764' r='7'/%3E%3Ccircle cx='40' cy='599' r='7'/%3E%3Ccircle cx='102' cy='382' r='7'/%3E%3Ccircle cx='127' cy='80' r='7'/%3E%3Ccircle cx='370' cy='105' r='7'/%3E%3Ccircle cx='578' cy='42' r='7'/%3E%3Ccircle cx='237' cy='261' r='7'/%3E%3Ccircle cx='390' cy='382' r='7'/%3E%3C/g%3E%3C/svg%3E"); + justify-content: center; + cursor: pointer; + opacity: 0.85; + transition: opacity 0.15s ease; +} + +.icon-btn:hover { + opacity: 1; +} + +.icon-btn svg { + width: 1.2rem; + height: 1.2rem; +} + +.input-icon { + position: absolute; + right: 0.5rem; + top: 50%; + transform: translateY(-50%); + padding: 0.25rem; +} + +.save-btn { + padding: 0.25rem; +} + +#canvas-container { + flex: 1; + width: 100%; + min-height: 0; + padding: 0.75rem 1rem 0.25rem; } -canvas{ - border: 1px solid lightgray; +canvas { width: 100%; height: 100%; + display: block; +} + +.bottom-bar { + display: flex; + align-items: center; + justify-content: center; + gap: 0.75rem; + padding: 0.35rem 0 0.8rem; +} + +.theme-icon { + display: none; +} + +[data-theme="light"] .sun-icon, +:root:not([data-theme="dark"]) .sun-icon { + display: block; +} + +[data-theme="dark"] .moon-icon { + display: block; } diff --git a/canvas.js b/canvas.js index 0c54a65..efef66a 100644 --- a/canvas.js +++ b/canvas.js @@ -1,6 +1,3 @@ - - - (function () { const SAMPLE_EXPRESSIONS = [ '(a + b)*c - (x - y)/z', @@ -13,94 +10,133 @@ '(a / y) + b - (c * x)', '(a - b) * (c + d) / z' ] + const THEME_STORAGE_KEY = 'etg-theme' + const DEBOUNCE_MS = 150 + var canvas = document.querySelector('canvas') - var c = canvas.getContext('2d') - function clearCanvas() { c.clearRect(0, 0, canvas.width, canvas.height) } - function exportCanvas() { - var bgMode = document.getElementById('export-bg-mode').value - var dataURL - if (bgMode === 'white') { - var exportCanvas = document.createElement('canvas') - var exportContext = exportCanvas.getContext('2d') - exportCanvas.width = canvas.width - exportCanvas.height = canvas.height - exportContext.fillStyle = '#ffffff' - exportContext.fillRect(0, 0, exportCanvas.width, exportCanvas.height) - exportContext.drawImage(canvas, 0, 0) - dataURL = exportCanvas.toDataURL('image/png') - } else { - dataURL = canvas.toDataURL('image/png') + var context = canvas.getContext('2d') + var container = document.getElementById('canvas-container') + var input = document.getElementById('expression-input') + var warning = document.getElementById('warning') + var themeToggle = document.getElementById('theme-toggle') + + var debounceId = null + var currentRoot = null + + function resizeCanvas() { + canvas.height = container.offsetHeight + canvas.width = container.offsetWidth + } + + function clearCanvas() { + context.clearRect(0, 0, canvas.width, canvas.height) + } + + function setWarningVisible(isVisible) { + warning.hidden = !isVisible + } + + function renderRoot(root) { + clearCanvas() + if (!root) { + return + } + setCoordinates(root) + drawTree(root, context) + } + + function renderExpression() { + var expression = input.value + if (typeof expression === 'undefined' || expression === null) { + setWarningVisible(false) + return + } + + expression = expression.replace(/\s+/g, '') + if (expression.length === 0) { + currentRoot = null + setWarningVisible(false) + clearCanvas() + return + } + + try { + var postfix = infixToPostfix(expression) + if (postfix === null) { + setWarningVisible(true) + return + } + var root = constructTree(postfix) + currentRoot = root + setWarningVisible(false) + renderRoot(root) + } catch (error) { + setWarningVisible(true) } + } + + function debouncedRender() { + clearTimeout(debounceId) + debounceId = setTimeout(renderExpression, DEBOUNCE_MS) + } + + function exportCanvas() { var link = document.createElement('a') - link.href = dataURL + link.href = canvas.toDataURL('image/png') link.download = 'expression-tree.png' link.click() } - document.getElementById('generate-tree').addEventListener('click', () => { - var expression = document.getElementById('expression-input').value - if (typeof expression !== 'undefined' && null != expression) { - expression = expression.replace(/\s+/g, '') - var postfix = infixToPostfix(expression); - if (null !== postfix) { - try { - var root = constructTree(postfix) - setCoordinates(root) - clearCanvas() - canvas.height = document.getElementById('canvas-container').offsetHeight; - canvas.width = document.getElementById('canvas-container').offsetWidth; - drawTree(root, c, document.getElementById('animate-toggle').checked) - } catch (e) { - displayErrorMessage() - } - } else { - displayErrorMessage() - } + function getPreferredTheme() { + var storedTheme = localStorage.getItem(THEME_STORAGE_KEY) + if (storedTheme === 'light' || storedTheme === 'dark') { + return storedTheme + } + return window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light' + } + + function applyTheme(theme, shouldPersist) { + document.documentElement.setAttribute('data-theme', theme) + if (shouldPersist) { + localStorage.setItem(THEME_STORAGE_KEY, theme) + } + if (currentRoot) { + renderRoot(currentRoot) + } else { + clearCanvas() + } + } + resizeCanvas() + + window.addEventListener('resize', function () { + resizeCanvas() + if (currentRoot) { + renderRoot(currentRoot) } else { - displayErrorMessage() + clearCanvas() } }) - document.getElementById('clear-tree').addEventListener('click', () => { - document.getElementById('expression-input').value = '' + input.addEventListener('input', debouncedRender) + + document.getElementById('clear-tree').addEventListener('click', function () { + input.value = '' + currentRoot = null + setWarningVisible(false) clearCanvas() + input.focus() }) document.getElementById('export-tree').addEventListener('click', exportCanvas) - document.getElementById('expression-input').addEventListener('keydown', (e) => { - if (e.key === 'Enter') { - e.preventDefault() - document.getElementById('generate-tree').click() - } + themeToggle.addEventListener('click', function () { + var nextTheme = document.documentElement.getAttribute('data-theme') === 'dark' ? 'light' : 'dark' + applyTheme(nextTheme, true) }) - document.getElementById('expression-input').value = SAMPLE_EXPRESSIONS[Math.floor(Math.random() * SAMPLE_EXPRESSIONS.length)] - setTimeout(() => { - document.getElementById('generate-tree').click() - }, 500) -})(); - - + applyTheme(getPreferredTheme(), false) -function displayErrorMessage() { - Swal.fire({ - icon: 'error', - title: 'Invalid expression', - html: ` -
- - You may only use these brackets ( ).
- - Use * for multiplication and / for division.
- - Supported unary functions: sin, cos, tan, log, ln, sqrt, exp, abs.
- - Custom operators: #name, #name(arg), #name(arg1,arg2,arg3) (max arity 3).
- - Valid operators and operands are:
-
- Operators: [+ - * / ]
- Operands: Single letters a-z and custom operators. -
-
- `, - footer: 'Learn more' - }) -} + input.value = SAMPLE_EXPRESSIONS[Math.floor(Math.random() * SAMPLE_EXPRESSIONS.length)] + renderExpression() +})(); diff --git a/index.html b/index.html index 5a68624..a316584 100644 --- a/index.html +++ b/index.html @@ -5,57 +5,70 @@ Expression Tree Generator - - - - -
-
-

Expression Tree Generator

-
- Current Expression: - +
+
+
+ + +
-
- - - - - -
+ +
+
+
-
- -
- -
- - - +
+ + + + +
+ + + + + - - - - - diff --git a/tree.js b/tree.js index 298087f..ec23b51 100644 --- a/tree.js +++ b/tree.js @@ -76,81 +76,51 @@ function Node(value, arity = 0, children) { return Math.max(8, Math.floor(baseSize * (maxTextWidth / textWidth))) } - this.drawEdge = function (context, childNode, resolve, animate) { + this.drawEdge = function (context, childNode) { + const styles = getComputedStyle(document.documentElement) const radius = this.getRadius(context) const childRadius = childNode.getRadius(context) - context.strokeStyle = 'gray'; + const edgeColor = styles.getPropertyValue('--edge').trim() || '#9e9e9e' + context.strokeStyle = edgeColor const dx = childNode.x - this.x const dy = childNode.y - this.y const distance = Math.sqrt((dx * dx) + (dy * dy)) if (distance === 0) { - resolve() return } const startX = this.x + (dx / distance) * radius const startY = this.y + (dy / distance) * radius const endX = childNode.x - (dx / distance) * childRadius const endY = childNode.y - (dy / distance) * childRadius - if (animate) { - drawEdgeAnimated(startX, startY, endX, endY, context, resolve) - } else { - context.beginPath() - context.moveTo(startX, startY) - context.lineTo(endX, endY) - context.stroke() - resolve() - } + context.beginPath() + context.moveTo(startX, startY) + context.lineTo(endX, endY) + context.stroke() } this.draw = function (context) { + const styles = getComputedStyle(document.documentElement) const radius = this.getRadius(context) + const nodeFill = styles.getPropertyValue('--node-fill').trim() || '#ffffff' + const nodeStroke = styles.getPropertyValue('--node-stroke').trim() || '#212121' + const textColor = styles.getPropertyValue('--fg').trim() || '#212121' + context.beginPath() context.arc(this.x, this.y, radius, 0, Math.PI * 2, false) - context.fillStyle = 'white' + context.fillStyle = nodeFill context.fill() - context.strokeStyle = '#212121' + context.strokeStyle = nodeStroke context.stroke() + const fontSize = this.getFontSize(context) context.font = fontSize + 'px Times New Roman' context.textAlign = 'center' context.textBaseline = 'middle' - context.fillStyle = "#212121"; - context.fillText(this.value, this.x, this.y); + context.fillStyle = textColor + context.fillText(this.value, this.x, this.y) } } -function drawEdgeAnimated(origin_x, origin_y, destine_x, destine_y, ctx, resolve) { - const vertices = [{ x: origin_x, y: origin_y }, { x: destine_x, y: destine_y }] - const N = 35; - var waypoints = []; - for (var i = 1; i < vertices.length; i++) { - var pt0 = vertices[i - 1]; - var pt1 = vertices[i]; - var dx = pt1.x - pt0.x; - var dy = pt1.y - pt0.y; - for (var j = 0; j <= N; j++) { - var x = pt0.x + dx * j / N; - var y = pt0.y + dy * j / N; - waypoints.push({ x: x, y: y }); - } - } - var t = 1 - function resolveCallback(callback) { - function animate() { - if (t < waypoints.length - 1) { requestAnimationFrame(animate) } - else { callback() } - ctx.beginPath(); - ctx.moveTo(waypoints[t - 1].x, waypoints[t - 1].y); - ctx.lineTo(waypoints[t].x, waypoints[t].y); - ctx.stroke(); - t++; - } - return animate - } - - requestAnimationFrame(resolveCallback(resolve)) -} - function constructTree(postfix) { var stack = [] for (var i = 0; i < postfix.length; i++) { @@ -239,14 +209,13 @@ function setCoordinates(root) { assignCoordinates(root, 0, canvas_mid_point - (totalWidth / 2), canvas_mid_point + (totalWidth / 2)) } -// must be async in order to await till animation is done -async function drawTree(root, context, animate = true) { +function drawTree(root, context) { if (null != root) { root.draw(context) for (var i = 0; i < root.children.length; i++) { var child = root.children[i] - await new Promise(resolve => root.drawEdge(context, child, resolve, animate)) - await drawTree(child, context, animate) + root.drawEdge(context, child) + drawTree(child, context) } } } From 66531e345bd9fd56cc0d30daea7a85fd1d7bf894 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 10:07:26 +0000 Subject: [PATCH 12/30] chore: add SRI for mathjs CDN script Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/e008f843-b6be-49f2-867a-0a32bd59bc0a Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- index.html | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/index.html b/index.html index a316584..1a1c6fc 100644 --- a/index.html +++ b/index.html @@ -65,7 +65,7 @@ - + From 2cefffe2e67c9131102f303fda3d3bff0ed3df44 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 10:18:05 +0000 Subject: [PATCH 13/30] Initial plan From 193ddfe0f85330ae9fb7b767d5b3f59b3b4bc006 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 10:26:48 +0000 Subject: [PATCH 14/30] Fix parser validation and add export popover with PNG/SVG options Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/83c7ae30-dbfc-4592-97f7-63dc5bddc7f3 Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- app.css | 98 +++++++++++++++++++++++++++++++--- canvas.js | 132 ++++++++++++++++++++++++++++++++++++++++++++-- index.html | 34 +++++++++--- infixToPostfix.js | 96 +-------------------------------- tree.js | 30 +++++++---- 5 files changed, 266 insertions(+), 124 deletions(-) diff --git a/app.css b/app.css index 211a9af..68a7e5f 100644 --- a/app.css +++ b/app.css @@ -34,22 +34,25 @@ body { body { background: var(--bg); color: var(--fg); + display: flex; + flex-direction: column; } .app { - min-height: 100vh; + flex: 1; display: flex; flex-direction: column; - align-items: center; + position: relative; } .controls { width: min(720px, calc(100vw - 2rem)); - margin: 1.25rem auto 0; + margin: auto; display: flex; flex-direction: column; align-items: center; gap: 0.65rem; + z-index: 1; } .input-wrap { @@ -115,10 +118,12 @@ body { } #canvas-container { - flex: 1; + position: fixed; + inset: 0; width: 100%; - min-height: 0; - padding: 0.75rem 1rem 0.25rem; + height: 100%; + padding: 0; + z-index: 0; } canvas { @@ -128,11 +133,15 @@ canvas { } .bottom-bar { + position: fixed; + bottom: 0.8rem; + left: 50%; + transform: translateX(-50%); display: flex; align-items: center; justify-content: center; gap: 0.75rem; - padding: 0.35rem 0 0.8rem; + z-index: 1; } .theme-icon { @@ -147,3 +156,78 @@ canvas { [data-theme="dark"] .moon-icon { display: block; } + +.export-popover { + position: relative; +} + +.export-popover summary { + list-style: none; +} + +.export-popover summary::-webkit-details-marker { + display: none; +} + +.export-panel { + position: absolute; + top: calc(100% + 0.5rem); + right: 0; + width: 180px; + border: 1px solid var(--muted); + border-radius: 12px; + background: var(--bg); + box-shadow: 0 10px 26px rgba(0, 0, 0, 0.15); + padding: 0.75rem; + gap: 0.6rem; +} + +.export-popover:not([open]) .export-panel { + display: none; +} + +.export-popover[open] .export-panel { + display: grid; +} + +.export-fieldset { + border: 0; + padding: 0; + margin: 0; + display: grid; + gap: 0.35rem; +} + +.export-fieldset legend { + font-size: 0.8rem; + margin-bottom: 0.2rem; +} + +.scale-row { + display: flex; + align-items: center; + justify-content: space-between; + gap: 0.5rem; + font-size: 0.9rem; +} + +#png-scale { + border: 1px solid var(--muted); + border-radius: 8px; + background: var(--bg); + color: var(--fg); + padding: 0.2rem 0.35rem; +} + +.download-btn { + border: 1px solid var(--muted); + border-radius: 9px; + background: transparent; + color: var(--fg); + padding: 0.35rem 0.5rem; + cursor: pointer; +} + +.download-btn:hover { + opacity: 0.9; +} diff --git a/canvas.js b/canvas.js index efef66a..e19c736 100644 --- a/canvas.js +++ b/canvas.js @@ -19,6 +19,11 @@ var input = document.getElementById('expression-input') var warning = document.getElementById('warning') var themeToggle = document.getElementById('theme-toggle') + var exportPopover = document.getElementById('export-popover') + var pngScaleRow = document.getElementById('png-scale-row') + var pngScale = document.getElementById('png-scale') + var formatInputs = document.querySelectorAll('input[name="export-format"]') + var downloadExport = document.getElementById('download-export') var debounceId = null var currentRoot = null @@ -80,13 +85,111 @@ debounceId = setTimeout(renderExpression, DEBOUNCE_MS) } - function exportCanvas() { + function triggerDownload(url, filename) { var link = document.createElement('a') - link.href = canvas.toDataURL('image/png') - link.download = 'expression-tree.png' + link.href = url + link.download = filename link.click() } + function exportPng(scale) { + if (!currentRoot) { + return + } + var exportScale = Math.max(1, scale || 1) + var offscreen = document.createElement('canvas') + offscreen.width = canvas.width * exportScale + offscreen.height = canvas.height * exportScale + var offscreenContext = offscreen.getContext('2d') + offscreenContext.scale(exportScale, exportScale) + drawTree(currentRoot, offscreenContext) + triggerDownload(offscreen.toDataURL('image/png'), 'expression-tree.png') + } + + function escapeXml(value) { + return String(value) + .replace(/&/g, '&') + .replace(//g, '>') + .replace(/"/g, '"') + .replace(/'/g, ''') + } + + function getThemeColors() { + var styles = getComputedStyle(document.documentElement) + return { + nodeFill: styles.getPropertyValue('--node-fill').trim() || '#ffffff', + nodeStroke: styles.getPropertyValue('--node-stroke').trim() || '#212121', + edge: styles.getPropertyValue('--edge').trim() || '#9e9e9e', + text: styles.getPropertyValue('--fg').trim() || '#212121' + } + } + + function treeToSvg(root) { + if (!root) { + return '' + } + var measureCanvas = document.createElement('canvas') + var measureContext = measureCanvas.getContext('2d') + var radius = getNodeRadius() + var colors = getThemeColors() + var lines = [] + var nodes = [] + + function walk(node) { + for (var i = 0; i < node.children.length; i++) { + var child = node.children[i] + var dx = child.x - node.x + var dy = child.y - node.y + var distance = Math.sqrt((dx * dx) + (dy * dy)) + if (distance !== 0) { + var startX = node.x + (dx / distance) * radius + var startY = node.y + (dy / distance) * radius + var endX = child.x - (dx / distance) * radius + var endY = child.y - (dy / distance) * radius + lines.push('') + } + walk(child) + } + var fontSize = getNodeFontSize(node.value, measureContext) + nodes.push('' + escapeXml(node.value) + '') + } + + walk(root) + return '' + + '' + + '' + lines.join('') + '' + + nodes.join('') + + '' + } + + function exportSvg() { + if (!currentRoot) { + return + } + var svgString = treeToSvg(currentRoot) + var blob = new Blob([svgString], { type: 'image/svg+xml' }) + var url = URL.createObjectURL(blob) + triggerDownload(url, 'expression-tree.svg') + setTimeout(function () { + URL.revokeObjectURL(url) + }, 0) + } + + function getSelectedExportFormat() { + for (var i = 0; i < formatInputs.length; i++) { + if (formatInputs[i].checked) { + return formatInputs[i].value + } + } + return 'png' + } + + function syncExportOptionsUi() { + var isPng = getSelectedExportFormat() === 'png' + pngScaleRow.hidden = !isPng + } + function getPreferredTheme() { var storedTheme = localStorage.getItem(THEME_STORAGE_KEY) if (storedTheme === 'light' || storedTheme === 'dark') { @@ -128,7 +231,27 @@ input.focus() }) - document.getElementById('export-tree').addEventListener('click', exportCanvas) + for (var formatIndex = 0; formatIndex < formatInputs.length; formatIndex++) { + formatInputs[formatIndex].addEventListener('change', syncExportOptionsUi) + } + + downloadExport.addEventListener('click', function () { + if (getSelectedExportFormat() === 'svg') { + exportSvg() + } else { + exportPng(parseInt(pngScale.value, 10) || 1) + } + exportPopover.open = false + }) + + document.addEventListener('click', function (event) { + if (!exportPopover.open) { + return + } + if (!exportPopover.contains(event.target)) { + exportPopover.open = false + } + }) themeToggle.addEventListener('click', function () { var nextTheme = document.documentElement.getAttribute('data-theme') === 'dark' ? 'light' : 'dark' @@ -136,6 +259,7 @@ }) applyTheme(getPreferredTheme(), false) + syncExportOptionsUi() input.value = SAMPLE_EXPRESSIONS[Math.floor(Math.random() * SAMPLE_EXPRESSIONS.length)] renderExpression() diff --git a/index.html b/index.html index 1a1c6fc..d17da49 100644 --- a/index.html +++ b/index.html @@ -27,13 +27,32 @@
- +
+ + + +
+
+ Format + + +
+ + +
+
@@ -65,7 +84,6 @@ - diff --git a/infixToPostfix.js b/infixToPostfix.js index 4e4077b..7fca6b8 100644 --- a/infixToPostfix.js +++ b/infixToPostfix.js @@ -1,22 +1,3 @@ -function isBracketed(expr) { - var stack = [] - for (var i = 0; i < expr.length; i++) { - if ('(' === expr[i]) { - stack.push('(') - } else if (')' === expr[i]) { - stack.pop() - if (stack.length === 0) { - if (i !== expr.length - 1) { - return false - } else { - return true - } - } - } - } - return false; -} - const VARIABLES = 'abcdefghijklmnopqrstuvwxyz' const BINARY_OPERATORS = ['*', '/', '-', '+'] const UNARY_FUNCTIONS = ['sin', 'cos', 'tan', 'log', 'ln', 'sqrt', 'exp', 'abs'] @@ -188,66 +169,11 @@ function parseAddSubtract(tokens, index, stopOnComma) { return { nextIndex: i } } -function isValidCustomExpression(tokens) { +function isValidTokens(tokens) { var parsed = parseAddSubtract(tokens, 0, false) return !!parsed && parsed.nextIndex === tokens.length } -function containsUnaryPlusOrMinus(node) { - if (!node || typeof node !== 'object') { - return false - } - if (node.type === 'OperatorNode' && (node.fn === 'unaryPlus' || node.fn === 'unaryMinus')) { - return true - } - if (node.args && node.args.length) { - for (var i = 0; i < node.args.length; i++) { - if (containsUnaryPlusOrMinus(node.args[i])) { - return true - } - } - } - if (node.content && containsUnaryPlusOrMinus(node.content)) { - return true - } - return false -} - -function isValidParsedNode(node) { - if (!node || typeof node !== 'object') { - return false - } - if (node.type === 'ParenthesisNode') { - return isValidParsedNode(node.content) - } - if (node.type === 'SymbolNode') { - return typeof node.name === 'string' && node.name.length === 1 && VARIABLES.indexOf(node.name) !== -1 - } - if (node.type === 'OperatorNode') { - if (node.implicit === true) { - return false - } - if (['add', 'subtract', 'multiply', 'divide'].indexOf(node.fn) === -1) { - return false - } - if (!node.args || node.args.length !== 2) { - return false - } - return isValidParsedNode(node.args[0]) && isValidParsedNode(node.args[1]) - } - if (node.type === 'FunctionNode') { - var fnName = node.fn && node.fn.name - if (UNARY_FUNCTIONS.indexOf(fnName) === -1) { - return false - } - if (!node.args || node.args.length !== 1) { - return false - } - return isValidParsedNode(node.args[0]) - } - return false -} - function isValidExpression(expr) { if (!ALLOWED_CHARACTERS_REGEX.test(expr)) { return false @@ -256,25 +182,7 @@ function isValidExpression(expr) { if (tokens === null || tokens.length === 0) { return false; } - var hasCustomToken = tokens.some(function (token) { return isCustomToken(token) }) - if (hasCustomToken) { - return isValidCustomExpression(tokens) - } - try { - while ("(" === expr[0] && ")" === expr[expr.length - 1]) { - if (isBracketed(expr)) { - expr = expr.substring(1, expr.length - 1); - } else break; - } - var res = math.parse(expr); - if (containsUnaryPlusOrMinus(res) || !isValidParsedNode(res)) { - return false; - } - return true; - } - catch (ex) { - return false; - } + return isValidTokens(tokens) } function infixToPostfix(expression) { diff --git a/tree.js b/tree.js index ec23b51..ade6273 100644 --- a/tree.js +++ b/tree.js @@ -33,6 +33,22 @@ function getTokenLabel(token) { return token } +function getNodeRadius() { + return 32.5 +} + +function getNodeFontSize(value, context) { + const baseSize = 25 + const radius = getNodeRadius() + const maxTextWidth = (radius - 6) * 2 + context.font = baseSize + 'px Times New Roman' + const textWidth = context.measureText(value).width + if (textWidth <= maxTextWidth) { + return baseSize + } + return Math.max(8, Math.floor(baseSize * (maxTextWidth / textWidth))) +} + function Node(value, arity = 0, children) { var self = this this.value = value; @@ -60,20 +76,12 @@ function Node(value, arity = 0, children) { this.isLeaf = () => this.children.length === 0; - this.getRadius = function (context) { - return 32.5 + this.getRadius = function () { + return getNodeRadius() } this.getFontSize = function (context) { - const baseSize = 25 - const radius = this.getRadius(context) - const maxTextWidth = (radius - 6) * 2 - context.font = baseSize + 'px Times New Roman' - const textWidth = context.measureText(this.value).width - if (textWidth <= maxTextWidth) { - return baseSize - } - return Math.max(8, Math.floor(baseSize * (maxTextWidth / textWidth))) + return getNodeFontSize(this.value, context) } this.drawEdge = function (context, childNode) { From 84b0c94c471a4ef03b54f6cb216ad5d304bc2e19 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 10:28:03 +0000 Subject: [PATCH 15/30] Ensure SVG blob URL persists long enough for download Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/83c7ae30-dbfc-4592-97f7-63dc5bddc7f3 Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- canvas.js | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/canvas.js b/canvas.js index e19c736..529c882 100644 --- a/canvas.js +++ b/canvas.js @@ -173,7 +173,7 @@ triggerDownload(url, 'expression-tree.svg') setTimeout(function () { URL.revokeObjectURL(url) - }, 0) + }, 1000) } function getSelectedExportFormat() { From 0a74059bacf409f820f18a28da94acc16799d8b3 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 11:13:05 +0000 Subject: [PATCH 16/30] Surface parser errors and display them between input and canvas Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/b76f2e13-c151-4ff7-b4e5-11c4f21e04aa Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- app.css | 19 +++++++++++ canvas.js | 35 ++++++++++++++----- index.html | 3 ++ infixToPostfix.js | 87 ++++++++++++++++++++++++++++++++++------------- 4 files changed, 112 insertions(+), 32 deletions(-) diff --git a/app.css b/app.css index 68a7e5f..b9b3da6 100644 --- a/app.css +++ b/app.css @@ -55,6 +55,25 @@ body { z-index: 1; } +.error-message { + width: 100%; + padding: 0.55rem 0.85rem; + border: 1px solid #e53935; + border-radius: 10px; + background: rgba(229, 57, 53, 0.08); + color: #e53935; + font-size: 0.9rem; + line-height: 1.3; + text-align: center; + word-break: break-word; +} + +[data-theme="dark"] .error-message { + color: #ff6b68; + border-color: #ff6b68; + background: rgba(255, 107, 104, 0.1); +} + .input-wrap { width: 100%; position: relative; diff --git a/canvas.js b/canvas.js index 529c882..9ad927a 100644 --- a/canvas.js +++ b/canvas.js @@ -18,6 +18,7 @@ var container = document.getElementById('canvas-container') var input = document.getElementById('expression-input') var warning = document.getElementById('warning') + var errorMessage = document.getElementById('error-message') var themeToggle = document.getElementById('theme-toggle') var exportPopover = document.getElementById('export-popover') var pngScaleRow = document.getElementById('png-scale-row') @@ -41,6 +42,26 @@ warning.hidden = !isVisible } + function setErrorMessage(message) { + if (message) { + errorMessage.textContent = message + errorMessage.hidden = false + } else { + errorMessage.textContent = '' + errorMessage.hidden = true + } + } + + function showError(message) { + setWarningVisible(true) + setErrorMessage(message) + } + + function clearError() { + setWarningVisible(false) + setErrorMessage('') + } + function renderRoot(root) { clearCanvas() if (!root) { @@ -53,30 +74,26 @@ function renderExpression() { var expression = input.value if (typeof expression === 'undefined' || expression === null) { - setWarningVisible(false) + clearError() return } expression = expression.replace(/\s+/g, '') if (expression.length === 0) { currentRoot = null - setWarningVisible(false) + clearError() clearCanvas() return } try { var postfix = infixToPostfix(expression) - if (postfix === null) { - setWarningVisible(true) - return - } var root = constructTree(postfix) currentRoot = root - setWarningVisible(false) + clearError() renderRoot(root) } catch (error) { - setWarningVisible(true) + showError((error && error.message) ? error.message : 'Invalid expression') } } @@ -226,7 +243,7 @@ document.getElementById('clear-tree').addEventListener('click', function () { input.value = '' currentRoot = null - setWarningVisible(false) + clearError() clearCanvas() input.focus() }) diff --git a/index.html b/index.html index d17da49..1e1b17c 100644 --- a/index.html +++ b/index.html @@ -27,6 +27,8 @@
+ +
+
diff --git a/infixToPostfix.js b/infixToPostfix.js index 7fca6b8..e356435 100644 --- a/infixToPostfix.js +++ b/infixToPostfix.js @@ -42,7 +42,7 @@ function tokenize(expression) { } if (current === '#') { if (i + 1 >= expression.length || !CUSTOM_IDENTIFIER_START.test(expression[i + 1])) { - return null + throw new Error("Expected an identifier after '#'") } var customName = expression[i + 1] i++ @@ -64,11 +64,11 @@ function tokenize(expression) { } else if (UNARY_FUNCTIONS.indexOf(ident) !== -1) { tokens.push(ident) } else { - return null + throw new Error("Unknown identifier '" + ident + "' (use '#" + ident + "' for a custom function)") } continue } - return null + throw new Error("Invalid character '" + current + "' in expression") } return tokens } @@ -174,29 +174,69 @@ function isValidTokens(tokens) { return !!parsed && parsed.nextIndex === tokens.length } +function describeToken(token) { + if (typeof token === 'undefined') { + return 'end of expression' + } + if (isCustomToken(token)) { + return "'#" + token.name + "'" + } + return "'" + token + "'" +} + +function validateTokens(tokens) { + var depth = 0 + for (var k = 0; k < tokens.length; k++) { + if (tokens[k] === '(') { + depth++ + } else if (tokens[k] === ')') { + depth-- + if (depth < 0) { + throw new Error("Mismatched ')' with no matching '('") + } + } + } + if (depth > 0) { + throw new Error("Missing closing ')'") + } + var parsed = parseAddSubtract(tokens, 0, false) + if (!parsed) { + throw new Error('Incomplete or malformed expression') + } + if (parsed.nextIndex !== tokens.length) { + throw new Error('Unexpected token ' + describeToken(tokens[parsed.nextIndex]) + ' at position ' + parsed.nextIndex) + } +} + function isValidExpression(expr) { - if (!ALLOWED_CHARACTERS_REGEX.test(expr)) { + try { + if (!ALLOWED_CHARACTERS_REGEX.test(expr)) { + return false + } + var tokens = tokenize(expr) + if (tokens === null || tokens.length === 0) { + return false; + } + return isValidTokens(tokens) + } catch (e) { return false } - var tokens = tokenize(expr) - if (tokens === null || tokens.length === 0) { - return false; - } - return isValidTokens(tokens) } function infixToPostfix(expression) { - if (!isValidExpression(expression)) { - return null; + if (!ALLOWED_CHARACTERS_REGEX.test(expression)) { + var badMatch = expression.match(/[^A-Za-z0-9_#,+\-*/()\s]/) + throw new Error("Invalid character '" + (badMatch ? badMatch[0] : '?') + "' in expression") + } + var tokens = tokenize(expression) + if (tokens.length === 0) { + throw new Error('Empty expression') } + validateTokens(tokens) const prec = { "*": 3, "/": 3, "-": 2, "+": 2, "(": 1 } var op_stack = [] var customCallStack = [] var postfixList = [] - var tokens = tokenize(expression) - if (tokens === null) { - return null - } for (var i = 0; i < tokens.length; i++) { var token = tokens[i] if (isVariableToken(token)) { @@ -218,21 +258,21 @@ function infixToPostfix(expression) { var commaTop = op_stack.pop() while (commaTop !== '(') { if (typeof commaTop === 'undefined') { - return null + throw new Error("Unexpected ',' outside of a function call") } postfixList.push(commaTop) commaTop = op_stack.pop() } op_stack.push('(') if (customCallStack.length === 0) { - return null + throw new Error("Unexpected ',' outside of a function call") } customCallStack[customCallStack.length - 1].commaCount++ } else if (")" === token) { var top_op_token = op_stack.pop() while (top_op_token !== '(') { if (typeof top_op_token === 'undefined') { - return null + throw new Error("Mismatched ')' with no matching '('") } postfixList.push(top_op_token) top_op_token = op_stack.pop() @@ -243,7 +283,7 @@ function infixToPostfix(expression) { if (isCustomToken(emittedFunction)) { var customFrame = customCallStack.pop() if (!customFrame || customFrame.name !== emittedFunction.name) { - return null + throw new Error("Mismatched custom function call for '#" + emittedFunction.name + "'") } postfixList.push(createCustomToken(emittedFunction.name, customFrame.commaCount + 1)) } else { @@ -263,11 +303,12 @@ function infixToPostfix(expression) { } } while (op_stack.length > 0) { - if (op_stack.slice(-1)[0] === '(') { - return null + var tail = op_stack.slice(-1)[0] + if (tail === '(') { + throw new Error("Missing closing ')'") } - if (isCustomToken(op_stack.slice(-1)[0])) { - return null + if (isCustomToken(tail)) { + throw new Error("Missing closing ')' for '#" + tail.name + "'") } postfixList.push(op_stack.pop()) } From 2a9c4d9af3e1ba4add157485a4ff6b16c9fc37d1 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 11:14:50 +0000 Subject: [PATCH 17/30] Remove now-unused isValidExpression/isValidTokens helpers Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/b76f2e13-c151-4ff7-b4e5-11c4f21e04aa Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- infixToPostfix.js | 20 -------------------- 1 file changed, 20 deletions(-) diff --git a/infixToPostfix.js b/infixToPostfix.js index e356435..64400ae 100644 --- a/infixToPostfix.js +++ b/infixToPostfix.js @@ -169,11 +169,6 @@ function parseAddSubtract(tokens, index, stopOnComma) { return { nextIndex: i } } -function isValidTokens(tokens) { - var parsed = parseAddSubtract(tokens, 0, false) - return !!parsed && parsed.nextIndex === tokens.length -} - function describeToken(token) { if (typeof token === 'undefined') { return 'end of expression' @@ -208,21 +203,6 @@ function validateTokens(tokens) { } } -function isValidExpression(expr) { - try { - if (!ALLOWED_CHARACTERS_REGEX.test(expr)) { - return false - } - var tokens = tokenize(expr) - if (tokens === null || tokens.length === 0) { - return false; - } - return isValidTokens(tokens) - } catch (e) { - return false - } -} - function infixToPostfix(expression) { if (!ALLOWED_CHARACTERS_REGEX.test(expression)) { var badMatch = expression.match(/[^A-Za-z0-9_#,+\-*/()\s]/) From 176a07dfa80aff4664d7557ea17e2bc47061388a Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 13:39:36 +0000 Subject: [PATCH 18/30] Render node labels as LaTeX via KaTeX with graceful fallback Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/ee4d85e1-eab5-46a5-8afd-e949b3a8f90a Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- README.md | 29 ++++++ canvas.js | 112 ++++++++++++++++---- index.html | 8 +- tree.js | 293 +++++++++++++++++++++++++++++++++++++++++++++++++++-- 4 files changed, 410 insertions(+), 32 deletions(-) diff --git a/README.md b/README.md index 303ed94..1248046 100644 --- a/README.md +++ b/README.md @@ -25,6 +25,35 @@ Examples: - `sin(#add(a,b))*#pi` - `#clamp(x,a,b)` +## LaTeX-rendered node labels + +Node labels are typeset with [KaTeX](https://katex.org/) (loaded from a CDN, +so no build step is required) for both the interactive canvas and the +exported PNG / SVG files. A few conventions make common symbols render +nicely out of the box: + +- **Operators**: `*` renders as `·` (`\cdot`), `/` as `÷` (`\div`); `+` + and `-` are left as-is. +- **Unary functions**: `sin`, `cos`, `tan`, `log`, `ln`, `exp` render in + upright math style; `sqrt` shows a radical (`√`) and `abs` shows + `|·|`. +- **Custom token symbols**: well-known names are mapped to their LaTeX + command, e.g. `#pi` → π, `#theta` → θ, `#alpha` → α, `#beta` → β, + `#gamma` → γ, `#lambda` → λ, `#mu` → μ, `#sigma` → σ, `#phi` → φ, + `#omega` → ω (plus uppercase variants like `#Gamma`, `#Delta`, + `#Sigma`, `#Omega`, …), `#infty` / `#infinity` → ∞, `#sum` → ∑, + `#prod` → ∏, `#int` → ∫, `#nabla` → ∇, `#partial` → ∂, + `#emptyset` → ∅. +- **Subscripts**: identifiers ending in digits are rendered with the + digits as a subscript — `x1` → *x*₁, `#theta12` → θ₁₂. An underscore + also introduces a subscript — `#a_foo` → *a*foo. +- **Unknown custom names** fall back to upright `\mathrm{name}` so they + remain legible without looking like variable products. + +If KaTeX fails to load or a label cannot be parsed, the node falls back +to rendering the raw token text, so expressions will always be +displayed. + ## Credits: * This [article](https://llimllib.github.io/pymag-trees/) which helped me a lot introducing me to Knuth's algorithm for the layout of the tree. diff --git a/canvas.js b/canvas.js index 9ad927a..80c2e9a 100644 --- a/canvas.js +++ b/canvas.js @@ -83,6 +83,7 @@ currentRoot = null clearError() clearCanvas() + updateCanvasAccessibility('') return } @@ -92,6 +93,7 @@ currentRoot = root clearError() renderRoot(root) + updateCanvasAccessibility(expression) } catch (error) { showError((error && error.message) ? error.message : 'Invalid expression') } @@ -114,13 +116,19 @@ return } var exportScale = Math.max(1, scale || 1) - var offscreen = document.createElement('canvas') - offscreen.width = canvas.width * exportScale - offscreen.height = canvas.height * exportScale - var offscreenContext = offscreen.getContext('2d') - offscreenContext.scale(exportScale, exportScale) - drawTree(currentRoot, offscreenContext) - triggerDownload(offscreen.toDataURL('image/png'), 'expression-tree.png') + var colors = getThemeColors() + var warmPromise = (typeof warmLatexCache === 'function') + ? warmLatexCache(currentRoot, colors.text) + : Promise.resolve() + warmPromise.then(function () { + var offscreen = document.createElement('canvas') + offscreen.width = canvas.width * exportScale + offscreen.height = canvas.height * exportScale + var offscreenContext = offscreen.getContext('2d') + offscreenContext.scale(exportScale, exportScale) + drawTree(currentRoot, offscreenContext) + triggerDownload(offscreen.toDataURL('image/png'), 'expression-tree.png') + }) } function escapeXml(value) { @@ -142,12 +150,10 @@ } } - function treeToSvg(root) { + function treeToSvg(root, cssText) { if (!root) { return '' } - var measureCanvas = document.createElement('canvas') - var measureContext = measureCanvas.getContext('2d') var radius = getNodeRadius() var colors = getThemeColors() var lines = [] @@ -168,29 +174,73 @@ } walk(child) } - var fontSize = getNodeFontSize(node.value, measureContext) - nodes.push('' + escapeXml(node.value) + '') + + var nodeSvg = '' + + // Try to embed the KaTeX-rendered HTML as a foreignObject so the + // exported SVG stays vector and editable. Fall back to a plain + // element with the raw label if KaTeX is unavailable. + var html = (typeof renderLatexToHtml === 'function') ? renderLatexToHtml(node.latex) : null + if (html) { + var metrics = measureLatexHtml(html, colors.text) + var maxDim = (radius - 6) * 2 + var scale = Math.min(1, maxDim / metrics.width, maxDim / metrics.height) + var drawW = metrics.width * scale + var drawH = metrics.height * scale + var foX = node.x - drawW / 2 + var foY = node.y - drawH / 2 + nodeSvg += '' + + '
' + + '' + html + '
' + } else { + var fontSize = getNodeFontSize(node.rawLabel, measureContextForSvg()) + nodeSvg += '' + + escapeXml(node.rawLabel) + '' + } + nodeSvg += '' + nodes.push(nodeSvg) } walk(root) + var styleBlock = cssText ? '' : '' return '' + - '' + + '' + + styleBlock + '' + lines.join('') + '' + nodes.join('') + '' } + var svgMeasureCanvas = null + function measureContextForSvg() { + if (!svgMeasureCanvas) { + svgMeasureCanvas = document.createElement('canvas') + } + return svgMeasureCanvas.getContext('2d') + } + function exportSvg() { if (!currentRoot) { return } - var svgString = treeToSvg(currentRoot) - var blob = new Blob([svgString], { type: 'image/svg+xml' }) - var url = URL.createObjectURL(blob) - triggerDownload(url, 'expression-tree.svg') - setTimeout(function () { - URL.revokeObjectURL(url) - }, 1000) + var cssPromise = (typeof getKatexCss === 'function') ? getKatexCss() : Promise.resolve('') + cssPromise.then(function (cssText) { + var svgString = treeToSvg(currentRoot, cssText) + var blob = new Blob([svgString], { type: 'image/svg+xml' }) + var url = URL.createObjectURL(blob) + triggerDownload(url, 'expression-tree.svg') + setTimeout(function () { + URL.revokeObjectURL(url) + }, 1000) + }) } function getSelectedExportFormat() { @@ -220,6 +270,10 @@ if (shouldPersist) { localStorage.setItem(THEME_STORAGE_KEY, theme) } + // Invalidate the rasterized LaTeX cache so labels re-render in the new --fg color. + if (typeof invalidateLatexCache === 'function') { + invalidateLatexCache() + } if (currentRoot) { renderRoot(currentRoot) } else { @@ -227,6 +281,23 @@ } } + if (typeof setLatexRerenderHandler === 'function') { + setLatexRerenderHandler(function () { + if (currentRoot) { + renderRoot(currentRoot) + } + }) + } + + function updateCanvasAccessibility(expression) { + if (expression) { + canvas.setAttribute('role', 'img') + canvas.setAttribute('aria-label', 'Expression tree for ' + expression) + } else { + canvas.removeAttribute('aria-label') + } + } + resizeCanvas() window.addEventListener('resize', function () { @@ -245,6 +316,7 @@ currentRoot = null clearError() clearCanvas() + updateCanvasAccessibility('') input.focus() }) diff --git a/index.html b/index.html index 1e1b17c..5856642 100644 --- a/index.html +++ b/index.html @@ -8,6 +8,8 @@ + + @@ -87,9 +89,9 @@ - - - + + + diff --git a/tree.js b/tree.js index ade6273..24eafde 100644 --- a/tree.js +++ b/tree.js @@ -1,6 +1,102 @@ const TREE_BINARY_OPERATORS = ['*', '/', '-', '+'] const TREE_UNARY_FUNCTIONS = ['sin', 'cos', 'tan', 'log', 'ln', 'sqrt', 'exp', 'abs'] +// Names recognized as math symbols / operators for custom tokens. +// Keys are the raw identifier (e.g. '#pi' -> 'pi'), values are LaTeX source. +const LATEX_SYMBOL_MAP = { + // Greek (lowercase) + 'alpha': '\\alpha', 'beta': '\\beta', 'gamma': '\\gamma', 'delta': '\\delta', + 'epsilon': '\\epsilon', 'varepsilon': '\\varepsilon', 'zeta': '\\zeta', 'eta': '\\eta', + 'theta': '\\theta', 'vartheta': '\\vartheta', 'iota': '\\iota', 'kappa': '\\kappa', + 'lambda': '\\lambda', 'mu': '\\mu', 'nu': '\\nu', 'xi': '\\xi', 'omicron': 'o', + 'pi': '\\pi', 'varpi': '\\varpi', 'rho': '\\rho', 'varrho': '\\varrho', + 'sigma': '\\sigma', 'varsigma': '\\varsigma', 'tau': '\\tau', 'upsilon': '\\upsilon', + 'phi': '\\phi', 'varphi': '\\varphi', 'chi': '\\chi', 'psi': '\\psi', 'omega': '\\omega', + // Greek (uppercase) + 'Gamma': '\\Gamma', 'Delta': '\\Delta', 'Theta': '\\Theta', 'Lambda': '\\Lambda', + 'Xi': '\\Xi', 'Pi': '\\Pi', 'Sigma': '\\Sigma', 'Upsilon': '\\Upsilon', + 'Phi': '\\Phi', 'Psi': '\\Psi', 'Omega': '\\Omega', + // Common constants / operators + 'infty': '\\infty', 'infinity': '\\infty', + 'sum': '\\sum', 'prod': '\\prod', 'int': '\\int', + 'nabla': '\\nabla', 'partial': '\\partial', + 'emptyset': '\\emptyset' +} + +// Escape a plain string so it is safe inside LaTeX \text{...}. +function escapeLatexText(value) { + return String(value) + .replace(/\\/g, '\\textbackslash{}') + .replace(/([&%$#_{}])/g, '\\$1') + .replace(/\^/g, '\\^{}') + .replace(/~/g, '\\~{}') +} + +// Convert an identifier like "x1", "a_2", "theta12" into LaTeX with a trailing subscript. +// Returns an object { latex, handled } where `handled` is false if the identifier +// should fall through to the default mapping. +function identifierToLatex(name) { + if (typeof name !== 'string' || name.length === 0) { + return { latex: '', handled: false } + } + // Explicit underscore split: everything after the first `_` becomes the subscript. + var underscoreIdx = name.indexOf('_') + if (underscoreIdx > 0 && underscoreIdx < name.length - 1) { + var base = name.slice(0, underscoreIdx) + var sub = name.slice(underscoreIdx + 1) + var baseLatex = baseIdentifierToLatex(base) + return { latex: baseLatex + '_{' + escapeLatexText(sub) + '}', handled: true } + } + // Trailing digits: "x1" -> x_{1}, "theta12" -> \theta_{12}. + var match = name.match(/^([A-Za-z]+)(\d+)$/) + if (match) { + var baseLatex2 = baseIdentifierToLatex(match[1]) + return { latex: baseLatex2 + '_{' + match[2] + '}', handled: true } + } + return { latex: baseIdentifierToLatex(name), handled: true } +} + +// Map a bare alphabetic identifier (no digits, no underscores) to LaTeX: +// - single letter -> as-is (rendered italic in math mode) +// - known symbol name -> symbol command (e.g. "pi" -> "\pi") +// - anything else -> \mathrm{name} +function baseIdentifierToLatex(name) { + if (name.length === 1) { + return name + } + if (Object.prototype.hasOwnProperty.call(LATEX_SYMBOL_MAP, name)) { + return LATEX_SYMBOL_MAP[name] + } + return '\\mathrm{' + escapeLatexText(name) + '}' +} + +// Produce the LaTeX source that should be rendered inside a node for the given token. +function getTokenLatex(token) { + if (isCustomToken(token)) { + var info = identifierToLatex(token.name) + return info.latex || '\\text{' + escapeLatexText(token.name) + '}' + } + if (isBinaryOperator(token)) { + if (token === '*') { return '\\cdot' } + if (token === '/') { return '\\div' } + return token + } + if (isUnaryFunction(token)) { + if (token === 'sqrt') { return '\\sqrt{\\;}' } + if (token === 'abs') { return '\\lvert\\,\\cdot\\,\\rvert' } + // sin, cos, tan, log, ln, exp all have \-prefixed LaTeX commands. + return '\\' + token + } + if (typeof token === 'string') { + var ident = identifierToLatex(token) + if (ident.handled) { + return ident.latex + } + return '\\text{' + escapeLatexText(token) + '}' + } + return '\\text{' + escapeLatexText(String(token)) + '}' +} + function isBinaryOperator(token) { return TREE_BINARY_OPERATORS.includes(token) } @@ -49,10 +145,172 @@ function getNodeFontSize(value, context) { return Math.max(8, Math.floor(baseSize * (maxTextWidth / textWidth))) } -function Node(value, arity = 0, children) { +// --------------------------------------------------------------------------- +// LaTeX label rasterization cache +// --------------------------------------------------------------------------- +// The canvas 2D API cannot render LaTeX directly, so we rasterize each +// (latex, color) pair via KaTeX -> HTML -> SVG -> . +// The cache is keyed by "|" so theme switches (which change +// --fg) transparently produce a new rendering. +// --------------------------------------------------------------------------- + +const KATEX_VERSION = '0.16.11' +const KATEX_FONT_BASE = 'https://cdn.jsdelivr.net/npm/katex@' + KATEX_VERSION + '/dist/' +const KATEX_CSS_URL = KATEX_FONT_BASE + 'katex.min.css' +const LATEX_BASE_FONT_SIZE = 25 + +var latexImageCache = new Map() +var latexRerenderHandler = null +var katexCssPromise = null + +function setLatexRerenderHandler(handler) { + latexRerenderHandler = handler +} + +function invalidateLatexCache() { + latexImageCache = new Map() +} + +// Fetch the KaTeX stylesheet so rasterized images and exported SVGs render +// correctly (font files, spacing, radicals, etc.). The fetch is lazy and +// shared across all callers. Font URLs are rewritten to absolute so they +// resolve from inside data: URLs and downloaded SVGs. +function getKatexCss() { + if (!katexCssPromise) { + if (typeof fetch !== 'function') { + katexCssPromise = Promise.resolve('') + } else { + katexCssPromise = fetch(KATEX_CSS_URL) + .then(function (response) { + return response.ok ? response.text() : '' + }) + .then(function (css) { + return css.replace(/url\(fonts\//g, 'url(' + KATEX_FONT_BASE + 'fonts/') + }) + .catch(function () { return '' }) + } + } + return katexCssPromise +} + +function renderLatexToHtml(latex) { + if (typeof katex === 'undefined' || !katex || typeof katex.renderToString !== 'function') { + return null + } + try { + return katex.renderToString(latex, { throwOnError: false, output: 'html', displayMode: false }) + } catch (error) { + return null + } +} + +function measureLatexHtml(html, color) { + var measure = document.createElement('div') + measure.setAttribute('aria-hidden', 'true') + measure.style.cssText = + 'position:absolute;left:-9999px;top:-9999px;visibility:hidden;' + + 'color:' + color + ';font-size:' + LATEX_BASE_FONT_SIZE + 'px;' + + 'line-height:1.2;display:inline-block;white-space:nowrap;' + measure.innerHTML = html + document.body.appendChild(measure) + var rect = measure.getBoundingClientRect() + document.body.removeChild(measure) + return { + width: Math.max(1, Math.ceil(rect.width)), + height: Math.max(1, Math.ceil(rect.height)) + } +} + +function buildLatexSvg(html, width, height, color, cssText) { + var style = cssText ? '' : '' + return '' + + style + + '' + + '
' + html + '
' + + '' +} + +// Returns a cache entry: { ready, image, width, height }. +// The entry object is returned synchronously; when the underlying image +// finishes loading, `ready` flips to true and the registered rerender +// handler is invoked so the node can be redrawn. +function getLatexImage(latex, color) { + var key = latex + '|' + color + var cached = latexImageCache.get(key) + if (cached) { return cached } + + var entry = { ready: false, image: null, width: 0, height: 0 } + latexImageCache.set(key, entry) + + var html = renderLatexToHtml(latex) + if (html === null) { + // KaTeX unavailable / failed: leave entry unready so the caller + // falls back to plain text. Retry once KaTeX loads. + if (typeof window !== 'undefined' && typeof katex === 'undefined') { + window.addEventListener('load', function () { + if (latexImageCache.get(key) === entry && !entry.ready) { + latexImageCache.delete(key) + if (latexRerenderHandler) { latexRerenderHandler() } + } + }, { once: true }) + } + return entry + } + + var size = measureLatexHtml(html, color) + entry.width = size.width + entry.height = size.height + + getKatexCss().then(function (cssText) { + var svg = buildLatexSvg(html, size.width, size.height, color, cssText) + var image = new Image() + image.onload = function () { + entry.image = image + entry.ready = true + if (latexRerenderHandler) { latexRerenderHandler() } + } + image.onerror = function () { + // Leave entry unready so callers fall back to plain text. + } + image.src = 'data:image/svg+xml;charset=utf-8,' + encodeURIComponent(svg) + }) + + return entry +} + +// Warm the cache for every label in the given tree and resolve once all +// images have loaded (or failed). Used before PNG export so the offscreen +// draw has the rasters ready. +function warmLatexCache(root, color) { + var promises = [] + function walk(node) { + if (!node) { return } + var entry = getLatexImage(node.latex, color) + if (!entry.ready && entry.width > 0) { + promises.push(new Promise(function (resolve) { + var check = function () { + if (entry.ready) { resolve() } + else { setTimeout(check, 30) } + } + // Cap the wait so a broken image never blocks export forever. + setTimeout(resolve, 2000) + check() + })) + } + for (var i = 0; i < node.children.length; i++) { walk(node.children[i]) } + } + walk(root) + return Promise.all(promises) +} + +function Node(value, arity = 0, children, latex, rawLabel) { var self = this this.value = value; this.arity = arity; + this.latex = (typeof latex === 'string' && latex.length > 0) ? latex : ('\\text{' + escapeLatexText(String(value)) + '}') + this.rawLabel = (typeof rawLabel === 'string') ? rawLabel : String(value) this.x = null; this.y = null; this.children = children || []; @@ -106,6 +364,15 @@ function Node(value, arity = 0, children) { context.stroke() } + this.drawFallbackLabel = function (context, textColor) { + const fontSize = this.getFontSize(context) + context.font = fontSize + 'px Times New Roman' + context.textAlign = 'center' + context.textBaseline = 'middle' + context.fillStyle = textColor + context.fillText(this.rawLabel, this.x, this.y) + } + this.draw = function (context) { const styles = getComputedStyle(document.documentElement) const radius = this.getRadius(context) @@ -120,12 +387,18 @@ function Node(value, arity = 0, children) { context.strokeStyle = nodeStroke context.stroke() - const fontSize = this.getFontSize(context) - context.font = fontSize + 'px Times New Roman' - context.textAlign = 'center' - context.textBaseline = 'middle' - context.fillStyle = textColor - context.fillText(this.value, this.x, this.y) + var entry = getLatexImage(this.latex, textColor) + if (entry && entry.ready && entry.image) { + const maxDim = (radius - 6) * 2 + var w = entry.width + var h = entry.height + var scale = Math.min(1, maxDim / w, maxDim / h) + var drawW = w * scale + var drawH = h * scale + context.drawImage(entry.image, this.x - drawW / 2, this.y - drawH / 2, drawW, drawH) + } else { + this.drawFallbackLabel(context, textColor) + } } } @@ -134,14 +407,16 @@ function constructTree(postfix) { for (var i = 0; i < postfix.length; i++) { var token = postfix[i] var arity = getTokenArity(token) + var label = getTokenLabel(token) + var latex = getTokenLatex(token) if (arity === 0) { - stack.push(new Node(getTokenLabel(token), 0, [])) + stack.push(new Node(label, 0, [], latex, label)) } else { if (stack.length < arity) { throw new Error('Invalid postfix expression') } var children = stack.splice(stack.length - arity, arity) - stack.push(new Node(getTokenLabel(token), arity, children)) + stack.push(new Node(label, arity, children, latex, label)) } } if (stack.length !== 1) { From 6b5a433e0527552248659a2575c8938ecd9ec528 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 13:42:23 +0000 Subject: [PATCH 19/30] Address review: single-pass LaTeX escape, cleaner warm-cache + a11y Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/ee4d85e1-eab5-46a5-8afd-e949b3a8f90a Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- canvas.js | 1 + tree.js | 52 +++++++++++++++++++++++++++++++++++++++++----------- 2 files changed, 42 insertions(+), 11 deletions(-) diff --git a/canvas.js b/canvas.js index 80c2e9a..92ec939 100644 --- a/canvas.js +++ b/canvas.js @@ -294,6 +294,7 @@ canvas.setAttribute('role', 'img') canvas.setAttribute('aria-label', 'Expression tree for ' + expression) } else { + canvas.removeAttribute('role') canvas.removeAttribute('aria-label') } } diff --git a/tree.js b/tree.js index 24eafde..ddcb379 100644 --- a/tree.js +++ b/tree.js @@ -24,12 +24,25 @@ const LATEX_SYMBOL_MAP = { } // Escape a plain string so it is safe inside LaTeX \text{...}. +// Done in a single pass so substitutions cannot re-escape each other +// (e.g. the braces produced by \textbackslash{} must not be treated as +// further `{`/`}` occurrences in the input). function escapeLatexText(value) { - return String(value) - .replace(/\\/g, '\\textbackslash{}') - .replace(/([&%$#_{}])/g, '\\$1') - .replace(/\^/g, '\\^{}') - .replace(/~/g, '\\~{}') + var replacements = { + '\\': '\\textbackslash{}', + '&': '\\&', + '%': '\\%', + '$': '\\$', + '#': '\\#', + '_': '\\_', + '{': '\\{', + '}': '\\}', + '^': '\\^{}', + '~': '\\~{}' + } + return String(value == null ? '' : value).replace(/[\\&%$#_{}^~]/g, function (ch) { + return replacements[ch] + }) } // Convert an identifier like "x1", "a_2", "theta12" into LaTeX with a trailing subscript. @@ -247,14 +260,21 @@ function getLatexImage(latex, color) { var html = renderLatexToHtml(latex) if (html === null) { // KaTeX unavailable / failed: leave entry unready so the caller - // falls back to plain text. Retry once KaTeX loads. + // falls back to plain text. Retry once KaTeX becomes available. if (typeof window !== 'undefined' && typeof katex === 'undefined') { - window.addEventListener('load', function () { + var retry = function () { if (latexImageCache.get(key) === entry && !entry.ready) { latexImageCache.delete(key) if (latexRerenderHandler) { latexRerenderHandler() } } - }, { once: true }) + } + if (typeof document !== 'undefined' && document.readyState === 'complete') { + // `load` has already fired; try again on the next tick so the + // CDN script (if still loading) has a chance to finish. + setTimeout(retry, 0) + } else { + window.addEventListener('load', retry, { once: true }) + } } return entry } @@ -290,12 +310,22 @@ function warmLatexCache(root, color) { var entry = getLatexImage(node.latex, color) if (!entry.ready && entry.width > 0) { promises.push(new Promise(function (resolve) { + var resolved = false + var pollId = 0 + var timeoutId = 0 + var finish = function () { + if (resolved) { return } + resolved = true + if (pollId) { clearTimeout(pollId) } + if (timeoutId) { clearTimeout(timeoutId) } + resolve() + } var check = function () { - if (entry.ready) { resolve() } - else { setTimeout(check, 30) } + if (entry.ready) { finish() } + else { pollId = setTimeout(check, 30) } } // Cap the wait so a broken image never blocks export forever. - setTimeout(resolve, 2000) + timeoutId = setTimeout(finish, 2000) check() })) } From 758c8d38d71c74e861745d1fee4fd720ace8479b Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 14:04:32 +0000 Subject: [PATCH 20/30] Require `#\name` for LaTeX symbols, sharpen canvas on HiDPI, pin controls to top on mobile Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/48759929-9b18-4e12-aafe-9360db561da6 Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- README.md | 33 +++++++++++++++++++-------------- app.css | 6 +++++- canvas.js | 26 ++++++++++++++++++++------ index.html | 2 +- infixToPostfix.js | 13 ++++++++++--- tree.js | 47 ++++++++++++++++++++++++++++++++--------------- 6 files changed, 87 insertions(+), 40 deletions(-) diff --git a/README.md b/README.md index 1248046..63a3f9e 100644 --- a/README.md +++ b/README.md @@ -10,7 +10,7 @@ Supported syntax includes: - Single-letter variables: `a`-`z` - Unary functions: `sin`, `cos`, `tan`, `log`, `ln`, `sqrt`, `exp`, `abs` - Custom operators/functions: - - Arity 0: `#pi` + - Arity 0: `#\pi` (LaTeX symbol), `#myvar` (plain upright text) - Arity 1-3 (inferred): `#sign(a)`, `#add(a,b)`, `#clamp(x,a,b)` Examples: @@ -19,10 +19,10 @@ Examples: - `sin(a)+cos(b)` - `sin(cos(a))` - `sin(a+b)*cos(c)` -- `#pi` +- `#\pi` - `#sign(a)` - `#add(a,b)` -- `sin(#add(a,b))*#pi` +- `sin(#add(a,b))*#\pi` - `#clamp(x,a,b)` ## LaTeX-rendered node labels @@ -37,18 +37,23 @@ nicely out of the box: - **Unary functions**: `sin`, `cos`, `tan`, `log`, `ln`, `exp` render in upright math style; `sqrt` shows a radical (`√`) and `abs` shows `|·|`. -- **Custom token symbols**: well-known names are mapped to their LaTeX - command, e.g. `#pi` → π, `#theta` → θ, `#alpha` → α, `#beta` → β, - `#gamma` → γ, `#lambda` → λ, `#mu` → μ, `#sigma` → σ, `#phi` → φ, - `#omega` → ω (plus uppercase variants like `#Gamma`, `#Delta`, - `#Sigma`, `#Omega`, …), `#infty` / `#infinity` → ∞, `#sum` → ∑, - `#prod` → ∏, `#int` → ∫, `#nabla` → ∇, `#partial` → ∂, - `#emptyset` → ∅. +- **Custom token symbols**: well-known LaTeX command names can be + reached with a leading backslash after `#`, e.g. `#\pi` → π, + `#\theta` → θ, `#\alpha` → α, `#\beta` → β, `#\gamma` → γ, + `#\lambda` → λ, `#\mu` → μ, `#\sigma` → σ, `#\phi` → φ, + `#\omega` → ω (plus uppercase variants like `#\Gamma`, `#\Delta`, + `#\Sigma`, `#\Omega`, …), `#\infty` / `#\infinity` → ∞, `#\sum` → ∑, + `#\prod` → ∏, `#\int` → ∫, `#\nabla` → ∇, `#\partial` → ∂, + `#\emptyset` → ∅. Any other `#\name` is forwarded to KaTeX as the + raw `\name` command. Without the backslash, `#phi` simply renders + as the upright text `phi`. - **Subscripts**: identifiers ending in digits are rendered with the - digits as a subscript — `x1` → *x*₁, `#theta12` → θ₁₂. An underscore - also introduces a subscript — `#a_foo` → *a*foo. -- **Unknown custom names** fall back to upright `\mathrm{name}` so they - remain legible without looking like variable products. + digits as a subscript — `x1` → *x*₁, `#\theta12` → θ₁₂. An + underscore also introduces a subscript — `#a_foo` → + *a*foo. +- **Unknown custom names** without a backslash fall back to upright + `\mathrm{name}` so they remain legible without looking like variable + products. If KaTeX fails to load or a label cannot be parsed, the node falls back to rendering the raw token text, so expressions will always be diff --git a/app.css b/app.css index b9b3da6..d8edc9a 100644 --- a/app.css +++ b/app.css @@ -47,7 +47,11 @@ body { .controls { width: min(720px, calc(100vw - 2rem)); - margin: auto; + /* Pin the input near the top rather than vertically centering it, so + the mobile keyboard opening (which shrinks the visual viewport and + re-centers anything using `margin: auto`) does not push the input + down over the tree. */ + margin: 1rem auto 0 auto; display: flex; flex-direction: column; align-items: center; diff --git a/canvas.js b/canvas.js index 92ec939..49643c7 100644 --- a/canvas.js +++ b/canvas.js @@ -4,7 +4,7 @@ '(a * b) - c + z / x', 'sin(a)+cos(b)', 'sin(a+b)*cos(c)', - 'sin(#add(a,b))*#pi', + 'sin(#add(a,b))*#\\pi', '#clamp(x,#min(a,b),c)', 'x - y + (c / (a + b))', '(a / y) + b - (c * x)', @@ -28,14 +28,28 @@ var debounceId = null var currentRoot = null + var cssWidth = 0 + var cssHeight = 0 function resizeCanvas() { - canvas.height = container.offsetHeight - canvas.width = container.offsetWidth + var dpr = Math.max(1, window.devicePixelRatio || 1) + cssWidth = container.offsetWidth + cssHeight = container.offsetHeight + canvas.width = Math.round(cssWidth * dpr) + canvas.height = Math.round(cssHeight * dpr) + canvas.style.width = cssWidth + 'px' + canvas.style.height = cssHeight + 'px' + // All drawing uses CSS pixels; the transform scales up to the + // high-resolution backing store so the tree stays crisp on HiDPI + // / mobile displays. + context.setTransform(dpr, 0, 0, dpr, 0, 0) } function clearCanvas() { + context.save() + context.setTransform(1, 0, 0, 1, 0, 0) context.clearRect(0, 0, canvas.width, canvas.height) + context.restore() } function setWarningVisible(isVisible) { @@ -122,8 +136,8 @@ : Promise.resolve() warmPromise.then(function () { var offscreen = document.createElement('canvas') - offscreen.width = canvas.width * exportScale - offscreen.height = canvas.height * exportScale + offscreen.width = cssWidth * exportScale + offscreen.height = cssHeight * exportScale var offscreenContext = offscreen.getContext('2d') offscreenContext.scale(exportScale, exportScale) drawTree(currentRoot, offscreenContext) @@ -212,7 +226,7 @@ walk(root) var styleBlock = cssText ? '' : '' return '' + - '' + + '' + styleBlock + '' + lines.join('') + '' + nodes.join('') + diff --git a/index.html b/index.html index 5856642..64703d0 100644 --- a/index.html +++ b/index.html @@ -16,7 +16,7 @@
- + + + +
+
diff --git a/infixToPostfix.js b/infixToPostfix.js index 699733a..b3e52c6 100644 --- a/infixToPostfix.js +++ b/infixToPostfix.js @@ -3,7 +3,7 @@ const BINARY_OPERATORS = ['*', '/', '-', '+'] const UNARY_FUNCTIONS = ['sin', 'cos', 'tan', 'log', 'ln', 'sqrt', 'exp', 'abs'] const CUSTOM_IDENTIFIER_START = /[A-Za-z_]/ const CUSTOM_IDENTIFIER_BODY = /[A-Za-z0-9_]/ -const ALLOWED_CHARACTERS_REGEX = /^[A-Za-z0-9_#\\,+\-*/()\s]*$/ +const NUMBER_BODY = /[0-9]/ function isCustomToken(token) { return token && typeof token === 'object' && token.type === 'custom' && typeof token.name === 'string' @@ -17,6 +17,15 @@ function createCustomToken(name, arity) { return token } +function isLiteralToken(token) { + return token && typeof token === 'object' && token.type === 'literal' && + (token.kind === 'text' || token.kind === 'latex') && typeof token.value === 'string' +} + +function createLiteralToken(kind, value) { + return { type: 'literal', kind: kind, value: value } +} + function isFunctionToken(token) { return UNARY_FUNCTIONS.indexOf(token) !== -1 || isCustomToken(token) } @@ -25,6 +34,15 @@ function isVariableToken(token) { return typeof token === 'string' && token.length === 1 && VARIABLES.indexOf(token) !== -1 } +function isNumberToken(token) { + return typeof token === 'string' && token.length > 0 && /^[0-9]+(\.[0-9]+)?$/.test(token) +} + +function isLeafToken(token) { + return isVariableToken(token) || isNumberToken(token) || isLiteralToken(token) || + (isCustomToken(token) && typeof token.arity === 'number' && token.arity === 0) +} + function tokenize(expression) { var tokens = [] for (var i = 0; i < expression.length; i++) { @@ -40,6 +58,40 @@ function tokenize(expression) { tokens.push(current) continue } + if (current === '"' || current === '$') { + var quote = current + var kind = (quote === '$') ? 'latex' : 'text' + var value = '' + var j = i + 1 + while (j < expression.length && expression[j] !== quote) { + value += expression[j] + j++ + } + if (j >= expression.length) { + throw new Error("Missing closing " + quote + " for literal") + } + tokens.push(createLiteralToken(kind, value)) + i = j + continue + } + if (NUMBER_BODY.test(current)) { + var number = current + while (i + 1 < expression.length && NUMBER_BODY.test(expression[i + 1])) { + number += expression[i + 1] + i++ + } + if (i + 1 < expression.length && expression[i + 1] === '.' && + i + 2 < expression.length && NUMBER_BODY.test(expression[i + 2])) { + number += '.' + i++ + while (i + 1 < expression.length && NUMBER_BODY.test(expression[i + 1])) { + number += expression[i + 1] + i++ + } + } + tokens.push(number) + continue + } if (current === '#') { var customName = '' // Optional leading backslash marks the identifier as a LaTeX command @@ -89,7 +141,7 @@ function parsePrimary(tokens, index, stopOnComma) { if (isStopToken(token, stopOnComma)) { return null } - if (isVariableToken(token)) { + if (isVariableToken(token) || isNumberToken(token) || isLiteralToken(token)) { return { nextIndex: index + 1 } } if (token === '(') { @@ -183,6 +235,10 @@ function describeToken(token) { if (isCustomToken(token)) { return "'#" + token.name + "'" } + if (isLiteralToken(token)) { + var quote = token.kind === 'latex' ? '$' : '"' + return quote + token.value + quote + } return "'" + token + "'" } @@ -211,10 +267,6 @@ function validateTokens(tokens) { } function infixToPostfix(expression) { - if (!ALLOWED_CHARACTERS_REGEX.test(expression)) { - var badMatch = expression.match(/[^A-Za-z0-9_#,+\-*/()\s]/) - throw new Error("Invalid character '" + (badMatch ? badMatch[0] : '?') + "' in expression") - } var tokens = tokenize(expression) if (tokens.length === 0) { throw new Error('Empty expression') @@ -226,7 +278,7 @@ function infixToPostfix(expression) { var postfixList = [] for (var i = 0; i < tokens.length; i++) { var token = tokens[i] - if (isVariableToken(token)) { + if (isVariableToken(token) || isNumberToken(token) || isLiteralToken(token)) { postfixList.push(token) } else if (isCustomToken(token)) { if (tokens[i + 1] === '(') { diff --git a/tree.js b/tree.js index fe4975b..87d71d0 100644 --- a/tree.js +++ b/tree.js @@ -102,6 +102,12 @@ function baseIdentifierToLatex(name) { // Produce the LaTeX source that should be rendered inside a node for the given token. function getTokenLatex(token) { + if (isLiteralToken(token)) { + if (token.kind === 'latex') { + return token.value + } + return '\\text{' + escapeLatexText(token.value) + '}' + } if (isCustomToken(token)) { var info = identifierToLatex(token.name) return info.latex || '\\text{' + escapeLatexText(token.name) + '}' @@ -118,6 +124,10 @@ function getTokenLatex(token) { return '\\' + token } if (typeof token === 'string') { + // Numeric literal: render digits as-is in math mode. + if (/^[0-9]+(\.[0-9]+)?$/.test(token)) { + return token + } var ident = identifierToLatex(token) if (ident.handled) { return ident.latex @@ -139,6 +149,11 @@ function isCustomToken(token) { return token && typeof token === 'object' && token.type === 'custom' && typeof token.name === 'string' } +function isLiteralToken(token) { + return token && typeof token === 'object' && token.type === 'literal' && + (token.kind === 'text' || token.kind === 'latex') && typeof token.value === 'string' +} + function getTokenArity(token) { if (isBinaryOperator(token)) { return 2 @@ -156,6 +171,9 @@ function getTokenLabel(token) { if (isCustomToken(token)) { return token.name } + if (isLiteralToken(token)) { + return token.value + } return token } From 746f351f14451f87174fb535826697bee4b27e12 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 15:35:35 +0000 Subject: [PATCH 23/30] Address review: guard PNG fallback, skip all whitespace, note execCommand deprecation Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/5b75eb54-6f1c-48ba-9bf7-aaf9694c9e14 Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- canvas.js | 12 ++++++++++-- infixToPostfix.js | 2 +- 2 files changed, 11 insertions(+), 3 deletions(-) diff --git a/canvas.js b/canvas.js index dcd31e5..95d8946 100644 --- a/canvas.js +++ b/canvas.js @@ -147,9 +147,15 @@ if (typeof offscreen.toBlob === 'function') { offscreen.toBlob(function (blob) { resolve(blob) }, 'image/png') } else { - // Fallback: derive blob from data URL. + // Fallback: derive blob from data URL. Guard against a + // malformed data URL so we don't throw inside atob(). var dataUrl = offscreen.toDataURL('image/png') - var binary = atob(dataUrl.split(',')[1]) + var commaIndex = dataUrl.indexOf(',') + if (commaIndex === -1) { + resolve(null) + return + } + var binary = atob(dataUrl.slice(commaIndex + 1)) var bytes = new Uint8Array(binary.length) for (var i = 0; i < binary.length; i++) { bytes[i] = binary.charCodeAt(i) } resolve(new Blob([bytes], { type: 'image/png' })) @@ -480,6 +486,8 @@ }) } else { // Fallback for environments without the async Clipboard API. + // document.execCommand('copy') is deprecated but remains the + // only option on older/insecure contexts. try { input.focus() input.select() diff --git a/infixToPostfix.js b/infixToPostfix.js index b3e52c6..ed54d94 100644 --- a/infixToPostfix.js +++ b/infixToPostfix.js @@ -47,7 +47,7 @@ function tokenize(expression) { var tokens = [] for (var i = 0; i < expression.length; i++) { var current = expression[i] - if (current === ' ') { + if (/\s/.test(current)) { continue } if (BINARY_OPERATORS.indexOf(current) !== -1 || current === '(' || current === ')') { From 5fd66539a5b334b93daa5a38a64f47069a66482f Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 20:55:43 +0000 Subject: [PATCH 24/30] Support "..." and $...$ literals as operator (non-leaf) nodes Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/6a07f6e3-f15c-48fd-9a87-599e008970de Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- infixToPostfix.js | 40 ++++++++++++++++++++++++++++++---------- tree.js | 3 +++ 2 files changed, 33 insertions(+), 10 deletions(-) diff --git a/infixToPostfix.js b/infixToPostfix.js index ed54d94..d2bf199 100644 --- a/infixToPostfix.js +++ b/infixToPostfix.js @@ -22,12 +22,16 @@ function isLiteralToken(token) { (token.kind === 'text' || token.kind === 'latex') && typeof token.value === 'string' } -function createLiteralToken(kind, value) { - return { type: 'literal', kind: kind, value: value } +function createLiteralToken(kind, value, arity) { + var token = { type: 'literal', kind: kind, value: value } + if (typeof arity === 'number') { + token.arity = arity + } + return token } function isFunctionToken(token) { - return UNARY_FUNCTIONS.indexOf(token) !== -1 || isCustomToken(token) + return UNARY_FUNCTIONS.indexOf(token) !== -1 || isCustomToken(token) || isLiteralToken(token) } function isVariableToken(token) { @@ -39,7 +43,8 @@ function isNumberToken(token) { } function isLeafToken(token) { - return isVariableToken(token) || isNumberToken(token) || isLiteralToken(token) || + return isVariableToken(token) || isNumberToken(token) || + (isLiteralToken(token) && (typeof token.arity !== 'number' || token.arity === 0)) || (isCustomToken(token) && typeof token.arity === 'number' && token.arity === 0) } @@ -141,7 +146,7 @@ function parsePrimary(tokens, index, stopOnComma) { if (isStopToken(token, stopOnComma)) { return null } - if (isVariableToken(token) || isNumberToken(token) || isLiteralToken(token)) { + if (isVariableToken(token) || isNumberToken(token)) { return { nextIndex: index + 1 } } if (token === '(') { @@ -161,7 +166,7 @@ function parsePrimary(tokens, index, stopOnComma) { } return { nextIndex: unaryArg.nextIndex + 1 } } - if (isCustomToken(token)) { + if (isCustomToken(token) || isLiteralToken(token)) { if (tokens[index + 1] !== '(') { return { nextIndex: index + 1 } } @@ -278,7 +283,7 @@ function infixToPostfix(expression) { var postfixList = [] for (var i = 0; i < tokens.length; i++) { var token = tokens[i] - if (isVariableToken(token) || isNumberToken(token) || isLiteralToken(token)) { + if (isVariableToken(token) || isNumberToken(token)) { postfixList.push(token) } else if (isCustomToken(token)) { if (tokens[i + 1] === '(') { @@ -286,11 +291,17 @@ function infixToPostfix(expression) { } else { postfixList.push(createCustomToken(token.name, 0)) } + } else if (isLiteralToken(token)) { + if (tokens[i + 1] === '(') { + op_stack.push(token) + } else { + postfixList.push(token) + } } else if (UNARY_FUNCTIONS.indexOf(token) !== -1) { op_stack.push(token) } else if ("(" === token) { - if (i > 0 && isCustomToken(tokens[i - 1])) { - customCallStack.push({ name: tokens[i - 1].name, commaCount: 0 }) + if (i > 0 && (isCustomToken(tokens[i - 1]) || isLiteralToken(tokens[i - 1]))) { + customCallStack.push({ token: tokens[i - 1], commaCount: 0 }) } op_stack.push(token) } else if ("," === token) { @@ -321,10 +332,16 @@ function infixToPostfix(expression) { var emittedFunction = op_stack.pop() if (isCustomToken(emittedFunction)) { var customFrame = customCallStack.pop() - if (!customFrame || customFrame.name !== emittedFunction.name) { + if (!customFrame || customFrame.token !== emittedFunction) { throw new Error("Mismatched custom function call for '#" + emittedFunction.name + "'") } postfixList.push(createCustomToken(emittedFunction.name, customFrame.commaCount + 1)) + } else if (isLiteralToken(emittedFunction)) { + var literalFrame = customCallStack.pop() + if (!literalFrame || literalFrame.token !== emittedFunction) { + throw new Error("Mismatched literal function call for " + describeToken(emittedFunction)) + } + postfixList.push(createLiteralToken(emittedFunction.kind, emittedFunction.value, literalFrame.commaCount + 1)) } else { postfixList.push(emittedFunction) } @@ -349,6 +366,9 @@ function infixToPostfix(expression) { if (isCustomToken(tail)) { throw new Error("Missing closing ')' for '#" + tail.name + "'") } + if (isLiteralToken(tail)) { + throw new Error("Missing closing ')' for " + describeToken(tail)) + } postfixList.push(op_stack.pop()) } return postfixList diff --git a/tree.js b/tree.js index 87d71d0..3f2507b 100644 --- a/tree.js +++ b/tree.js @@ -164,6 +164,9 @@ function getTokenArity(token) { if (isCustomToken(token)) { return token.arity || 0 } + if (isLiteralToken(token)) { + return token.arity || 0 + } return 0 } From 83b7ab1d8478f8a6b0f5cff71300a524cfb44733 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Tue, 21 Apr 2026 20:56:47 +0000 Subject: [PATCH 25/30] Consolidate custom/literal arity branch in getTokenArity Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/6a07f6e3-f15c-48fd-9a87-599e008970de Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- tree.js | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/tree.js b/tree.js index 3f2507b..ab47210 100644 --- a/tree.js +++ b/tree.js @@ -161,10 +161,7 @@ function getTokenArity(token) { if (isUnaryFunction(token)) { return 1 } - if (isCustomToken(token)) { - return token.arity || 0 - } - if (isLiteralToken(token)) { + if (isCustomToken(token) || isLiteralToken(token)) { return token.arity || 0 } return 0 From 31bb7d501dc9f910cd7ac0837ee896e94a6f4ed3 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Wed, 22 Apr 2026 10:01:18 +0000 Subject: [PATCH 26/30] Initial plan From 1bb09bfe64c00e14b61c7cfa9f5b5e03c1eb69cb Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Wed, 22 Apr 2026 10:07:01 +0000 Subject: [PATCH 27/30] fix: crop PNG and SVG exports to tree bounds Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/c9e2989e-e474-4379-be4a-3c23f5510fce Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- canvas.js | 52 +++++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 49 insertions(+), 3 deletions(-) diff --git a/canvas.js b/canvas.js index 95d8946..66589b3 100644 --- a/canvas.js +++ b/canvas.js @@ -12,6 +12,7 @@ ] const THEME_STORAGE_KEY = 'etg-theme' const DEBOUNCE_MS = 150 + const EXPORT_PADDING = 16 var canvas = document.querySelector('canvas') var context = canvas.getContext('2d') @@ -127,6 +128,36 @@ link.click() } + function computeTreeBounds(root) { + if (!root) { + return null + } + var radius = getNodeRadius() + var minX = Infinity + var minY = Infinity + var maxX = -Infinity + var maxY = -Infinity + + function walk(node) { + if (!node) { + return + } + minX = Math.min(minX, node.x - radius) + minY = Math.min(minY, node.y - radius) + maxX = Math.max(maxX, node.x + radius) + maxY = Math.max(maxY, node.y + radius) + for (var i = 0; i < node.children.length; i++) { + walk(node.children[i]) + } + } + + walk(root) + if (!isFinite(minX)) { + return null + } + return { minX: minX, minY: minY, maxX: maxX, maxY: maxY } + } + function buildPngBlob(scale) { if (!currentRoot) { return Promise.resolve(null) @@ -137,11 +168,18 @@ ? warmLatexCache(currentRoot, colors.text) : Promise.resolve() return warmPromise.then(function () { + var bounds = computeTreeBounds(currentRoot) + if (!bounds) { + return null + } + var width = (bounds.maxX - bounds.minX) + (2 * EXPORT_PADDING) + var height = (bounds.maxY - bounds.minY) + (2 * EXPORT_PADDING) var offscreen = document.createElement('canvas') - offscreen.width = cssWidth * exportScale - offscreen.height = cssHeight * exportScale + offscreen.width = Math.ceil(width * exportScale) + offscreen.height = Math.ceil(height * exportScale) var offscreenContext = offscreen.getContext('2d') offscreenContext.scale(exportScale, exportScale) + offscreenContext.translate(-bounds.minX + EXPORT_PADDING, -bounds.minY + EXPORT_PADDING) drawTree(currentRoot, offscreenContext) return new Promise(function (resolve) { if (typeof offscreen.toBlob === 'function') { @@ -197,6 +235,14 @@ return '' } var radius = getNodeRadius() + var bounds = computeTreeBounds(root) + if (!bounds) { + return '' + } + var viewBoxX = bounds.minX - EXPORT_PADDING + var viewBoxY = bounds.minY - EXPORT_PADDING + var viewBoxWidth = (bounds.maxX - bounds.minX) + (2 * EXPORT_PADDING) + var viewBoxHeight = (bounds.maxY - bounds.minY) + (2 * EXPORT_PADDING) var colors = getThemeColors() var lines = [] var nodes = [] @@ -254,7 +300,7 @@ walk(root) var styleBlock = cssText ? '' : '' return '' + - '' + + '' + styleBlock + '' + lines.join('') + '' + nodes.join('') + From 08dafb1225ee8d2ab2b030083768f20efb734eda Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Wed, 22 Apr 2026 10:10:28 +0000 Subject: [PATCH 28/30] chore: harden bounds traversal for missing children Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/c9e2989e-e474-4379-be4a-3c23f5510fce Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- canvas.js | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/canvas.js b/canvas.js index 66589b3..4428d5f 100644 --- a/canvas.js +++ b/canvas.js @@ -146,8 +146,9 @@ minY = Math.min(minY, node.y - radius) maxX = Math.max(maxX, node.x + radius) maxY = Math.max(maxY, node.y + radius) - for (var i = 0; i < node.children.length; i++) { - walk(node.children[i]) + var children = node.children || [] + for (var i = 0; i < children.length; i++) { + walk(children[i]) } } From e3b604a8543d11e7539dd9a5b57e39bfd35b1de6 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Wed, 22 Apr 2026 10:11:54 +0000 Subject: [PATCH 29/30] refactor: share padded bounds size for export cropping Agent-Logs-Url: https://github.com/psaegert/expression-tree-gen/sessions/c9e2989e-e474-4379-be4a-3c23f5510fce Co-authored-by: psaegert <36567814+psaegert@users.noreply.github.com> --- canvas.js | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/canvas.js b/canvas.js index 4428d5f..ce68ed9 100644 --- a/canvas.js +++ b/canvas.js @@ -132,6 +132,7 @@ if (!root) { return null } + // All nodes share a single radius (from getNodeRadius()). var radius = getNodeRadius() var minX = Infinity var minY = Infinity @@ -159,6 +160,13 @@ return { minX: minX, minY: minY, maxX: maxX, maxY: maxY } } + function getPaddedBoundsSize(bounds) { + return { + width: (bounds.maxX - bounds.minX) + (2 * EXPORT_PADDING), + height: (bounds.maxY - bounds.minY) + (2 * EXPORT_PADDING) + } + } + function buildPngBlob(scale) { if (!currentRoot) { return Promise.resolve(null) @@ -173,11 +181,10 @@ if (!bounds) { return null } - var width = (bounds.maxX - bounds.minX) + (2 * EXPORT_PADDING) - var height = (bounds.maxY - bounds.minY) + (2 * EXPORT_PADDING) + var size = getPaddedBoundsSize(bounds) var offscreen = document.createElement('canvas') - offscreen.width = Math.ceil(width * exportScale) - offscreen.height = Math.ceil(height * exportScale) + offscreen.width = Math.ceil(size.width * exportScale) + offscreen.height = Math.ceil(size.height * exportScale) var offscreenContext = offscreen.getContext('2d') offscreenContext.scale(exportScale, exportScale) offscreenContext.translate(-bounds.minX + EXPORT_PADDING, -bounds.minY + EXPORT_PADDING) @@ -242,8 +249,9 @@ } var viewBoxX = bounds.minX - EXPORT_PADDING var viewBoxY = bounds.minY - EXPORT_PADDING - var viewBoxWidth = (bounds.maxX - bounds.minX) + (2 * EXPORT_PADDING) - var viewBoxHeight = (bounds.maxY - bounds.minY) + (2 * EXPORT_PADDING) + var size = getPaddedBoundsSize(bounds) + var viewBoxWidth = size.width + var viewBoxHeight = size.height var colors = getThemeColors() var lines = [] var nodes = [] From 266e362bdcfbed7d91a8609160dd0a688a68b6e2 Mon Sep 17 00:00:00 2001 From: psaegert Date: Sat, 13 Jun 2026 17:09:39 +0200 Subject: [PATCH 30/30] docs: fork-aware README + footer credit to original, with screenshots - Rewrite README to reflect the current app (KaTeX labels, numbers, text/ LaTeX literals, PNG/SVG export with scale + copy, live render, dark mode). - Point primary links to this fork's site/repo; credit Lucas Nogueira's original (lnogueir/expression-tree-gen) and link it. - Fix dead Georgia Tech shunting-yard credit link -> runestone (pythonds3); add a no-license attribution note. - Footer now links to BOTH this fork (GitHub icon) and the original ("Fork of lnogueir/expression-tree-gen" text link); wrap/width guard so the floating bar does not overflow on narrow screens. - Add light/dark screenshots (docs/) and embed them near the top. Co-Authored-By: Claude Opus 4.8 (1M context) --- README.md | 191 +++++++++++++++++++++++++------------- app.css | 18 +++- docs/screenshot-dark.png | Bin 0 -> 68714 bytes docs/screenshot-light.png | Bin 0 -> 68599 bytes index.html | 3 +- 5 files changed, 144 insertions(+), 68 deletions(-) create mode 100644 docs/screenshot-dark.png create mode 100644 docs/screenshot-light.png diff --git a/README.md b/README.md index 63a3f9e..53deb8a 100644 --- a/README.md +++ b/README.md @@ -1,66 +1,125 @@ -# expression-tree-gen -Building an expression tree of an arithmetic expression is something quite useful and it is one of the steps a compilers must take to generate machine code. - -With that in mind, and inspired on my lectures on the tree data structure I decided to create a web app that simulates the creation of such a tree given an expression. - -Visit this [website](https://lnogueir.github.io/expression-tree-gen/) to simulate an expression yourself. - -Supported syntax includes: -- Binary operators: `+`, `-`, `*`, `/` -- Single-letter variables: `a`-`z` -- Unary functions: `sin`, `cos`, `tan`, `log`, `ln`, `sqrt`, `exp`, `abs` -- Custom operators/functions: - - Arity 0: `#\pi` (LaTeX symbol), `#myvar` (plain upright text) - - Arity 1-3 (inferred): `#sign(a)`, `#add(a,b)`, `#clamp(x,a,b)` - -Examples: -- `a+b` -- `sin(a)` -- `sin(a)+cos(b)` -- `sin(cos(a))` -- `sin(a+b)*cos(c)` -- `#\pi` -- `#sign(a)` -- `#add(a,b)` -- `sin(#add(a,b))*#\pi` -- `#clamp(x,a,b)` - -## LaTeX-rendered node labels - -Node labels are typeset with [KaTeX](https://katex.org/) (loaded from a CDN, -so no build step is required) for both the interactive canvas and the -exported PNG / SVG files. A few conventions make common symbols render -nicely out of the box: - -- **Operators**: `*` renders as `·` (`\cdot`), `/` as `÷` (`\div`); `+` - and `-` are left as-is. -- **Unary functions**: `sin`, `cos`, `tan`, `log`, `ln`, `exp` render in - upright math style; `sqrt` shows a radical (`√`) and `abs` shows - `|·|`. -- **Custom token symbols**: well-known LaTeX command names can be - reached with a leading backslash after `#`, e.g. `#\pi` → π, - `#\theta` → θ, `#\alpha` → α, `#\beta` → β, `#\gamma` → γ, - `#\lambda` → λ, `#\mu` → μ, `#\sigma` → σ, `#\phi` → φ, - `#\omega` → ω (plus uppercase variants like `#\Gamma`, `#\Delta`, - `#\Sigma`, `#\Omega`, …), `#\infty` / `#\infinity` → ∞, `#\sum` → ∑, - `#\prod` → ∏, `#\int` → ∫, `#\nabla` → ∇, `#\partial` → ∂, - `#\emptyset` → ∅. Any other `#\name` is forwarded to KaTeX as the - raw `\name` command. Without the backslash, `#phi` simply renders - as the upright text `phi`. -- **Subscripts**: identifiers ending in digits are rendered with the - digits as a subscript — `x1` → *x*₁, `#\theta12` → θ₁₂. An - underscore also introduces a subscript — `#a_foo` → - *a*foo. -- **Unknown custom names** without a backslash fall back to upright - `\mathrm{name}` so they remain legible without looking like variable - products. - -If KaTeX fails to load or a label cannot be parsed, the node falls back -to rendering the raw token text, so expressions will always be -displayed. - -## Credits: - -* This [article](https://llimllib.github.io/pymag-trees/) which helped me a lot introducing me to Knuth's algorithm for the layout of the tree. -* This [article](http://ice-web.cc.gatech.edu/ce21/1/static/audio/static/pythonds/BasicDS/InfixPrefixandPostfixExpressions.html) which introduced me to Dijkstra's Shunting-yard algorithm. -* The [mycodeschool](https://www.youtube.com/user/mycodeschool) youtube channel with great videos explaning the algorithms said above. +# Expression Tree Generator + +A small, dependency-light web app that parses an arithmetic expression and draws its **expression tree** live on a canvas as you type. Node labels are typeset with LaTeX (via KaTeX), and the rendered tree can be exported to PNG or SVG. + +

+ Expression tree for sin(#add(a,b))*#\pi, light theme + Expression tree for sin(#add(a,b))*#\pi, dark theme +

+ +**Try it live (this fork): https://psaegert.github.io/expression-tree-gen/** + +> **This is a maintained fork.** The original *Expression Tree Generator* was created by **Lucas Nogueira** ([@lnogueir](https://github.com/lnogueir)). This repository builds on that work with a rewritten real-time UI, LaTeX-rendered node labels, PNG / SVG export, light / dark theming, and a few syntax extensions (numbers, text and LaTeX literals). See [Credits](#credits) and [License and attribution](#license-and-attribution). + +| | Live site | Repository | +| ------------------------- | ----------------------------------------------- | ------------------------------------------------ | +| **This fork** (maintained) | https://psaegert.github.io/expression-tree-gen/ | https://github.com/psaegert/expression-tree-gen | +| Original (Lucas Nogueira) | https://lnogueir.github.io/expression-tree-gen/ | https://github.com/lnogueir/expression-tree-gen | + +## What it does + +Type an expression and the app validates it, converts it to a syntax tree, and renders that tree as labelled circular nodes connected by edges. There is no generate or submit step: the drawing updates automatically as you type (debounced by 150 ms). Invalid input shows an inline error message plus a small warning indicator while keeping the last valid drawing on screen, so the canvas is never abruptly cleared. A random sample expression is pre-filled on first load. + +## Features + +- **Real-time rendering.** The tree redraws on every keystroke (150 ms debounce); there is no generate button. +- **LaTeX-rendered labels.** Node labels are typeset with [KaTeX](https://katex.org/), so operators, Greek letters, subscripts, radicals, and similar symbols render properly. See [Node label rendering](#node-label-rendering) for the conventions. +- **Export to PNG or SVG.** An export menu offers PNG (at 1x, 2x, 3x, or 4x scale) or SVG. Each export is cropped to the tree's bounding box with a small margin. PNGs are rendered crisp on HiDPI displays; SVGs stay vector by embedding the KaTeX output, so they remain editable. +- **Download or copy.** Either download the export as a file (`expression-tree.png` / `expression-tree.svg`) or copy it straight to the clipboard. +- **Copy the expression.** A one-click button copies the current expression text. +- **Light / dark theme.** A toggle switches themes; the choice is saved in `localStorage` and defaults to your operating system preference on the first visit. Labels and edges re-render to match the active theme. +- **Helpful errors.** Invalid input produces a specific message (for example a mismatched parenthesis or an unknown identifier) rather than failing silently. +- **Responsive and accessible.** The canvas resizes with the window and exposes an `aria-label` describing the current expression. + +## Supported syntax + +- **Binary operators:** `+`, `-`, `*`, `/` (standard precedence, with parentheses for grouping) +- **Unary functions:** `sin`, `cos`, `tan`, `log`, `ln`, `sqrt`, `exp`, `abs` +- **Variables:** a single lowercase letter, `a` to `z` +- **Numbers:** integer or decimal literals, for example `2` or `3.14` +- **Custom tokens:** `#name`, for example `#pi`, `#add(a, b)` (see below) +- **Text and LaTeX literals:** `"label"` and `$\latex$` (see below) + +A run of lowercase letters is only accepted if it is a single variable or an exact match of one of the unary function names above. Anything else (an unknown multi-letter identifier, an uppercase letter, an unexpected character) is reported as an error. + +### Custom tokens (`#name`) + +A custom token is a leading `#` followed by an identifier (first character a letter or `_`, then letters, digits, or `_`). Arity is **inferred from usage**, not declared: + +- A custom token **not** followed by `(` is an arity-0 leaf, for example `#pi`. +- A custom token **followed by** `(` is a call whose arity is the number of comma-separated arguments, for example `#add(a, b)` has arity 2. +- Arity is **capped at 3**: a call with more than three arguments is rejected. + +Adding a backslash after the `#` marks the identifier as a LaTeX command, so `#\pi` renders as the symbol π while `#pi` renders as the upright text `pi`. See [Node label rendering](#node-label-rendering). + +### Text and LaTeX literals + +For labels that are not valid identifiers, you can quote them: + +- `"label"` renders the quoted text as a plain-text node label. +- `$...$` renders the quoted content as raw LaTeX, for example `$\frac{a}{b}$`. + +Like custom tokens, a literal followed by `(` becomes a function node whose arity is inferred from its arguments (capped at 3), for example `"relu"(x)` or `$\sigma$(a, b)`. + +### Examples + +```text +sin(#add(a,b))*#\pi +#clamp(x, #min(a,b), c) +(a + b)*c - (x - y)/z +sqrt(a*a + b*b) +2*x + 3.14 +$\Sigma$(a, b, c) +"relu"(x) +``` + +## Node label rendering + +Labels are typeset with [KaTeX](https://katex.org/), loaded from a CDN, so no build step is required. A few conventions make common symbols render nicely out of the box: + +- **Operators:** `*` renders as `·` (`\cdot`), `/` as `÷` (`\div`); `+` and `-` are left as-is. +- **Unary functions:** `sin`, `cos`, `tan`, `log`, `ln`, `exp` render in upright math style; `sqrt` shows a radical (√) and `abs` shows `|·|`. +- **Custom token symbols:** well-known LaTeX command names can be reached with a leading backslash after `#`, for example `#\pi` to π, `#\theta` to θ, `#\alpha` to α, `#\lambda` to λ, `#\sigma` to σ, `#\omega` to ω, plus uppercase variants such as `#\Gamma`, `#\Sigma`, `#\Omega`, and a handful of operators (`#\infty`, `#\sum`, `#\prod`, `#\int`, `#\nabla`, `#\partial`, `#\emptyset`). Any other `#\name` is forwarded to KaTeX as the raw `\name` command. Without the backslash, `#phi` simply renders as the upright text `phi`. +- **Subscripts:** identifiers ending in digits are rendered with the digits as a subscript, so `x1` becomes *x*₁ and `#\theta12` becomes θ₁₂. An underscore also introduces a subscript, so `#a_foo` becomes *a* with subscript foo. +- **Unknown custom names** without a backslash fall back to upright `\mathrm{name}` so they stay legible. + +If KaTeX cannot load or a label cannot be parsed, the node falls back to its raw token text, so expressions are always displayed. + +## How it works + +1. **Tokenize.** The input is scanned into variables, numbers, the binary operators, unary function names, parentheses, commas, `#`-prefixed custom tokens, and quoted literals. Anything outside this grammar raises a descriptive error. +2. **Validate.** A hand-rolled recursive-descent parser checks that the token stream forms a well-formed expression and that parentheses match. There is no external math library. +3. **Infix to postfix.** A valid expression is converted to postfix using Dijkstra's shunting-yard algorithm, extended to count the arguments of custom and literal function calls so the right arity is attached. +4. **Build the tree.** The postfix stream is consumed with a stack, popping each operator or function's children according to its arity. +5. **Lay out.** Layout is a top-down recursive partition: vertical position is set by depth, and each node's horizontal range is split among its children in proportion to their leaf counts. +6. **Render.** Each node is drawn as a circle whose label is a KaTeX rasterization (with a plain-text fallback); edges are trimmed to the node boundaries. SVG export reuses the same geometry but embeds the KaTeX output as vector content. + +## Running locally + +The app is a static site with **no build step**. Its only runtime dependency is **KaTeX**, loaded from a CDN, which is used purely to typeset labels: parsing, layout, and export all run offline, and labels gracefully fall back to plain text if KaTeX cannot load. + +```bash +git clone https://github.com/psaegert/expression-tree-gen.git +cd expression-tree-gen + +# Option A: open index.html directly in your browser +# Option B (recommended): serve the folder, then open http://localhost:8000 +python3 -m http.server 8000 +``` + +## Credits + +This fork is built on the original **Expression Tree Generator** by **Lucas Nogueira** ([lnogueir/expression-tree-gen](https://github.com/lnogueir/expression-tree-gen)). + +Educational references that informed the original project: + +- **Tree layout:** [Drawing Presentable Trees](https://llimllib.github.io/pymag-trees/) by Bill Mill, a tour of tree-layout algorithms from Knuth onward. +- **Infix to postfix:** [Infix, Prefix, and Postfix Expressions](https://runestone.academy/ns/books/published/pythonds3/BasicDS/InfixPrefixandPostfixExpressions.html), the chapter on Dijkstra's shunting-yard conversion from *Problem Solving with Algorithms and Data Structures using Python* by Miller and Ranum. +- **[mycodeschool](https://www.youtube.com/user/mycodeschool)** on YouTube, for clear explanations of the algorithms above. + +## License and attribution + +Neither this fork nor the original repository ships a LICENSE file, so no license is asserted here. If you reuse this code, please credit the original author and link back to the source: + +- Original author: **Lucas Nogueira** ([github.com/lnogueir](https://github.com/lnogueir)) +- Original repository: [github.com/lnogueir/expression-tree-gen](https://github.com/lnogueir/expression-tree-gen) diff --git a/app.css b/app.css index 2976305..e23a65c 100644 --- a/app.css +++ b/app.css @@ -180,12 +180,28 @@ canvas { left: 50%; transform: translateX(-50%); display: flex; + flex-wrap: wrap; align-items: center; justify-content: center; - gap: 0.75rem; + gap: 0.4rem 0.75rem; + max-width: calc(100vw - 1.5rem); z-index: 1; } +.credit { + font-size: 0.8rem; + color: var(--muted); +} + +.credit a { + color: inherit; + text-decoration: underline; +} + +.credit a:hover { + color: var(--fg); +} + .theme-icon { display: none; } diff --git a/docs/screenshot-dark.png b/docs/screenshot-dark.png new file mode 100644 index 0000000000000000000000000000000000000000..0fc6a9a36e781baef258fce5d2d79e840595ad30 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