Update deps and adds some useful API documentation

API usage.md

@@ -0,0 +1,256 @@
+## API and usage
+
+*Install (via npm for Node.js)*
+
+`npm i esquery --save`
+
+*Quick start*
+
+```js
+const esquery = require('esquery');
+
+const conditional = "if (x === 1) { foo(); } else { x = 2; }"
+
+var matches = esquery(conditional, "[name='x']")
+console.log(matches);
+```
+
+The following examples are taken from the test cases in `/tests` folder.
+
+### Attribute query
+
+*for loop*
+
+`for (i = 0; i < foo.length; i++) { foo[i](); }`
+
+- `[operator="="]` - matches `i = 0`
+- `[object.name="foo"]` - object named `foo` ie. `foo.length`
+- `[name=/i|foo/]` - where name of node matches `i` or `foo`
+
+*simple function*
+
+```js
+function foo(x, y) {
+  var z = x + y;
+  z++;
+  return z;
+}
+```
+
+- `[kind="var"]` - a `var`
+- `[id.name="foo"]` - `foo` declaration, fx a function or variable
+- `[left]` - left expression, such as `var z`
+- `FunctionDeclaration[params.0.name=x]` - where first argument of function is named `x`
+
+*simple program*
+
+```js
+var x = 1;
+var y = 'y';
+x = x * 2;
+if (y) { y += 'z'; }
+```
+
+- `[body]` - full body, such as function/scope body
+- `[body.length<2]` - body has less than 2 nodes
+- `[body.length>1]` - body has more than 1 node
+- `[body.length<=2]` - body has 2 or less nodes
+- `[body.length>=1]` - body has 1 or more nodes
+- `[name=/[asdfy]/]` - name matches the characters `asdfy`
+
+*conditional*
+
+```js
+if (x === 1) { foo(); } else { x = 2; }
+if (x == 'test' && true || x) { y = -1; } else if (false) { y = 1; }
+```
+
+- `[name="x"]` - node named `x`
+- `[name!="x"]` - node not named `x`
+- `[name=/x|foo/]` - node matches `x` or `foo`
+- `[name!=/x|y/]` - node does not match `x` or `y`
+- `[callee.name="foo"]` - Where `callee` is named `foo` (ie. function call)
+- `[operator]` - That is any type of operator (such as `==`, `||` etc)
+- `[prefix=true]` - node that has `prefix` set to true, such as `++c`
+- `[test=type(object)]` - where subject of condition is an object, such as `x` in `|| x`
+- `[value=type(boolean)]` - where value is a boolean, such 
+as `&& true`
+
+Example: `prefix`
+
+AST node representing unary operators such as `++`, `~`, `typeof` and `delete`"
+
+`++c` has `prefix: true` and `c++` has `prefix: false`
+
+```js
+interface UnaryExpression <: Expression {
+    type: "UnaryExpression";
+    operator: UnaryOperator;
+    prefix: boolean;
+    argument: Expression;
+}
+```
+
+### Classes
+
+`:statement` - a statement
+`:expression` - an expression
+`:function` - a function
+`:declaration` - a declaration
+`:pattern` - a pattern
+
+Examples:
+
+`[name="x"]:function` - function named `x`
+`[name="foo"]:declaration` - declaration named `foo`
+
+## Complex
+
+- descendant selector (` ` space)
+- child selector (`>`)
+- adjacent sibling selector (`+`)
+- general sibling selector (`~`)
+
+Please see [javascript: expressions-vs-statements](http://www.2ality.com/2012/09/expressions-vs-statements.html)
+
+`IfStatement > BinaryExpression` - `if` statement followed by a [binary expression](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators) fx `3+4` or `x*y`
+
+Valid: `if (2 === 2)`
+
+`IfStatement > BinaryExpression > Identifier`
+
+Valid: `if (x === 2)`
+
+`IfStatement BinaryExpression`
+
+An `if` statement with any binary expression below it.
+
+`VariableDeclaration ~ IfStatement`
+
+`var` declaration with sibling `if` statement
+
+Valid: siblings of same body
+```js
+var x = 1;
+if (x === 2)
+```
+
+`VariableDeclaration + ExpressionStatement`
+
+Valid: variable declaration followed by next sibling which is an expression statement (see [javascript statements and declarations](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements))
+
+```js
+var y = 'y';
+x = x * 2;
+```
+
+### Compound
+
+`[left.name="x"][right.value=1]` - where the left side is a node name `x` and the right has the value `1`
+
+Valid: `x = 1`
+
+`[left.name="x"]:matches(*)` any type of node where the left side is named `x`
+
+### Descendant
+
+`Program IfStatement` - Any program with an `if` statement
+
+`Identifier[name=x]` - identified named `x` such as `const x`. Identifiers are used to name variables and functions and to provide labels for certain loops...
+
+`Identifier [name=x]` - any identifier with named `x`, such as `const x`
+
+`BinaryExpression [name=x]` a binary expression where one side is named `x`, such as `x !== 3`
+
+`AssignmentExpression [name=x]` an assignment where one side is named `x`, such as `x = 2` or `y = x`
+
+### Fields
+
+You can also query on the [Mozilla Parser API](https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey/Parser_API) fields directly
+
+Example:
+
+```js
+interface IfStatement <: Statement {
+    type: "IfStatement";
+    test: Expression;
+    consequent: Statement;
+    alternate: Statement | null;
+}
+```
+
+`.test` - node (object) that has a `test` field set
+`.declarations.init` - node that has `.declarations.init` set
+
+`init` means initialised, such as `var x = 1`, where `x` is initialised to value `1`
+
+```js
+interface VariableDeclaration <: Declaration {
+    type: "VariableDeclaration";
+    declarations: [ VariableDeclarator ];
+    kind: "var" | "let" | "const";
+}
+
+interface VariableDeclarator <: Node {
+    type: "VariableDeclarator";
+    id: Pattern;
+    init: Expression | null;
+}
+```
+
+### :has
+
+`ExpressionStatement:has([name="foo"][type="Identifier"])`
+
+Valid: `const foo = 2`
+
+### Matches
+
+`,` means OR (ie. any of)
+
+- `:matches(IfStatement)`
+- `:matches(BinaryExpression, MemberExpression)`
+- `:matches([name="foo"], ReturnStatement)`
+- `:matches(AssignmentExpression, BinaryExpression)`
+- `AssignmentExpression, BinaryExpression, NonExistant`
+
+### Not
+
+- `:not(Literal)` not a literal
+- `:not([name="x"])` not a node named `x`
+- `:not(*)` - not anything!
+- `:not(Identifier, IfStatement)`
+- `:not([value=1])` not a node set to value of `1`
+
+### Pseudo child
+
+`:first-child` - first child node
+`:last-child` - last child node
+`:nth-child(2)` - 2nd child
+`:nth-last-child(2)` - 2nd last child
+
+### Subject
+
+`!IfStatement Identifier` - any not an If statement with an Identifier under, such as `const x = 3` but not `if (x == 2)`
+
+`!* > [name="foo"]` all nodes but those where the immediate child is a node namded `foo` 
+
+More examples:
+
+- `![test] [name="y"]`
+- `![generator=type(boolean)] > BlockStatement`
+- `![operator=/=+/] > [name="x"]`
+- `!:matches(*) > [name="foo"]`
+- `!:not(BlockStatement) > [name="foo"]`
+- `![left.name="x"][right.value=1]`
+- `* !AssignmentExpression`
+- `!VariableDeclaration ~ IfStatement`
+- `!VariableDeclaration + !ExpressionStatement`
+
+### Types
+
+- `LogicalExpression`
+- `ForStatement`
+- `FunctionDeclaration`
+- `ReturnStatement`
+- `AssignmentExpression`

README.md

@@ -23,4 +23,6 @@ The following selectors are supported:
 * [subject indicator](http://dev.w3.org/csswg/selectors4/#subject): `!IfStatement > [name="foo"]`
 * class of AST node: `:statement`, `:expression`, `:declaration`, `:function`, or `:pattern`
 
-[![Build Status](https://travis-ci.org/estools/esquery.png?branch=master)](https://travis-ci.org/estools/esquery)
+See `API usage.md` document for API usage examples and explanations.
+
+[![Build Status](https://travis-ci.org/estools/esquery.png?branch=master)](https://travis-ci.org/estools/esquery)

esquery.js

@@ -80,6 +80,22 @@
                     }
                     return true;
 
+                case 'has':
+                    var a, collector = [];
+                    for (i = 0, l = selector.selectors.length; i < l; ++i) {
+                      a = [];
+                      estraverse.traverse(node, {
+                          enter: function (node, parent) {
+                              if (parent != null) { a.unshift(parent); }
+                              if (matches(node, selector.selectors[i], a)) {
+                                collector.push(node);
+                              }
+                          },
+                          leave: function () { a.shift(); }
+                      });
+                    }
+                    return collector.length !== 0;
+
                 case 'child':
                     if (matches(node, selector.right, ancestry)) {
                         return matches(ancestry[0], selector.left, ancestry.slice(1));

grammar.pegjs

@@ -49,7 +49,7 @@ sequence
 
 atom
   = wildcard / identifier / attr / field / negation / matches
-  / firstChild / lastChild / nthChild / nthLastChild / class
+  / has / firstChild / lastChild / nthChild / nthLastChild / class
 
 wildcard = a:"*" { return { type: 'wildcard', value: a }; }
 identifier = "#"? i:identifierName { return { type: 'identifier', value: i }; }
@@ -88,12 +88,14 @@ field = "." i:identifierName is:("." identifierName)* {
 
 negation = ":not(" _ ss:selectors _ ")" { return { type: 'not', selectors: ss }; }
 matches = ":matches(" _ ss:selectors _ ")" { return { type: 'matches', selectors: ss }; }
+has = ":has(" _ ss:selectors _ ")" { return { type: 'has', selectors: ss }; }
 
 firstChild = ":first-child" { return nth(1); }
 lastChild = ":last-child" { return nthLast(1); }
 nthChild = ":nth-child(" _ n:[0-9]+ _ ")" { return nth(parseInt(n.join(''), 10)); }
 nthLastChild = ":nth-last-child(" _ n:[0-9]+ _ ")" { return nthLast(parseInt(n.join(''), 10)); }
 
+
 class = ":" c:("statement"i / "expression"i / "declaration"i / "function"i / "pattern"i) {
   return { type: 'class', name: c };
 }

package.json

@@ -1,7 +1,7 @@
 {
   "name": "esquery",
   "preferGlobal": false,
-  "version": "0.4.0",
+  "version": "0.4.1",
   "author": "Joel Feenstra <jrfeenst+esquery@gmail.com>",
   "description": "A query library for ECMAScript AST using a CSS selector like query language.",
   "main": "esquery.js",
@@ -25,16 +25,16 @@
     "query"
   ],
   "devDependencies": {
-    "jstestr": ">=0.4",
-    "pegjs": "~0.7.0",
-    "commonjs-everywhere": "~0.9.4",
-    "esprima": "~1.1.1"
+    "commonjs-everywhere": "~0.9.7",
+    "esprima": "^3.1.0",
+    "jstestr": "^0.4.2",
+    "pegjs": "^0.10.0"
   },
   "license": "BSD",
   "engines": {
-    "node": ">=0.6"
+    "node": ">=5.0.0"
   },
   "dependencies": {
-    "estraverse": "^4.0.0"
+    "estraverse": "^4.2.0"
   }
 }