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+# API Documentation
+
+*Please use only this documented API when working with the parser. Methods
+not documented here are subject to change at any point.*
+
+## `parser` function
+
+This is the module's main entry point.
+
+```js
+var parser = require('postcss-selector-parser');
+```
+
+### `parser([transform])`
+
+Creates a new `processor` instance
+
+```js
+var processor = parser();
+
+// or, with optional transform function
+var transform = function (selectors) {
+    selectors.eachUniversal(function (selector) {
+        selector.remove();
+    });
+};
+
+var processor = parser(transform)
+
+// Example
+var result = processor.process('*.class').result;
+// => .class
+```
+
+[See processor documentation](#processor)
+
+Arguments:
+
+* `transform (function)`: Provide a function to work with the parsed AST.
+
+### `parser.attribute([props])`
+
+Creates a new attribute selector.
+
+```js
+parser.attribute({attribute: 'href'});
+// => [href]
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.className([props])`
+
+Creates a new class selector.
+
+```js
+parser.className({value: 'button'});
+// => .button
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.combinator([props])`
+
+Creates a new selector combinator.
+
+```js
+parser.combinator({value: '+'});
+// => +
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.comment([props])`
+
+Creates a new comment.
+
+```js
+parser.comment({value: '/* Affirmative, Dave. I read you. */'});
+// => /* Affirmative, Dave. I read you. */
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.id([props])`
+
+Creates a new id selector.
+
+```js
+parser.id({value: 'search'});
+// => #search
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.nesting([props])`
+
+Creates a new nesting selector.
+
+```js
+parser.nesting();
+// => &
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.pseudo([props])`
+
+Creates a new pseudo selector.
+
+```js
+parser.pseudo({value: '::before'});
+// => ::before
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.root([props])`
+
+Creates a new root node.
+
+```js
+parser.root();
+// => (empty)
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.selector([props])`
+
+Creates a new selector node.
+
+```js
+parser.selector();
+// => (empty)
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.string([props])`
+
+Creates a new string node.
+
+```js
+parser.string();
+// => (empty)
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.tag([props])`
+
+Creates a new tag selector.
+
+```js
+parser.tag({value: 'button'});
+// => button
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+### `parser.universal([props])`
+
+Creates a new universal selector.
+
+```js
+parser.universal();
+// => *
+```
+
+Arguments:
+
+* `props (object)`: The new node's properties.
+
+## Node types
+
+### `node.type`
+
+A string representation of the selector type. It can be one of the following;
+`attribute`, `class`, `combinator`, `comment`, `id`, `nesting`, `pseudo`,
+`root`, `selector`, `string`, `tag`, or `universal`. Note that for convenience,
+these constants are exposed on the main `parser` as uppercased keys. So for
+example you can get `id` by querying `parser.ID`.
+
+```js
+parser.attribute({attribute: 'href'}).type;
+// => 'attribute'
+```
+
+### `node.parent`
+
+Returns the parent node.
+
+```js
+root.nodes[0].parent === root;
+```
+
+### `node.toString()`, `String(node)`, or `'' + node`
+
+Returns a string representation of the node.
+
+```js
+var id = parser.id({value: 'search'});
+console.log(String(id));
+// => #search
+```
+
+### `node.next()` & `node.prev()`
+
+Returns the next/previous child of the parent node.
+
+```js
+var next = id.next();
+if (next && next.type !== 'combinator') {
+    throw new Error('Qualified IDs are not allowed!');
+}
+```
+
+### `node.replaceWith(node)`
+
+Replace a node with another.
+
+```js
+var attr = selectors.first.first;
+var className = parser.className({value: 'test'});
+attr.replaceWith(className);
+```
+
+Arguments:
+
+* `node`: The node to substitute the original with.
+
+### `node.remove()`
+
+Removes the node from its parent node.
+
+```js
+if (node.type === 'id') {
+    node.remove();
+}
+```
+
+### `node.clone()`
+
+Returns a copy of a node, detached from any parent containers that the
+original might have had.
+
+```js
+var cloned = parser.id({value: 'search'});
+String(cloned);
+
+// => #search
+```
+
+### `node.spaces`
+
+Extra whitespaces around the node will be moved into `node.spaces.before` and
+`node.spaces.after`. So for example, these spaces will be moved as they have
+no semantic meaning:
+
+```css
+      h1     ,     h2   {}
+```
+
+However, *combinating* spaces will form a `combinator` node:
+
+```css
+h1        h2 {}
+```
+
+A `combinator` node may only have the `spaces` property set if the combinator
+value is a non-whitespace character, such as `+`, `~` or `>`. Otherwise, the
+combinator value will contain all of the spaces between selectors.
+
+### `node.source`
+
+An object describing the node's start/end, line/column source position.
+
+Within the following CSS, the `.bar` class node ...
+
+```css
+.foo,
+  .bar {}
+```
+
+... will contain the following `source` object.
+
+```js
+source: {
+    start: {
+        line: 2,
+        column: 3
+    },
+    end: {
+        line: 2,
+        column: 6
+    }
+}
+```
+
+### `node.sourceIndex`
+
+The zero-based index of the node within the original source string.
+
+Within the following CSS, the `.baz` class node will have a `sourceIndex` of `12`.
+
+```css
+.foo, .bar, .baz {}
+```
+
+## Container types
+
+The `root`, `selector`, and `pseudo` nodes have some helper methods for working
+with their children.
+
+### `container.nodes`
+
+An array of the container's children.
+
+```js
+// Input: h1 h2
+selectors.at(0).nodes.length   // => 3
+selectors.at(0).nodes[0].value // => 'h1'
+selectors.at(0).nodes[1].value // => ' '
+```
+
+### `container.first` & `container.last`
+
+The first/last child of the container.
+
+```js
+selector.first === selector.nodes[0];
+selector.last === selector.nodes[selector.nodes.length - 1];
+```
+
+### `container.at(index)`
+
+Returns the node at position `index`.
+
+```js
+selector.at(0) === selector.first;
+selector.at(0) === selector.nodes[0];
+```
+
+Arguments:
+
+* `index`: The index of the node to return.
+
+### `container.index(node)`
+
+Return the index of the node within its container.
+
+```js
+selector.index(selector.nodes[2]) // => 2
+```
+
+Arguments:
+
+* `node`: A node within the current container.
+
+### `container.length`
+
+Proxy to the length of the container's nodes.
+
+```js
+container.length === container.nodes.length
+```
+
+### `container` Array iterators
+
+The container class provides proxies to certain Array methods; these are:
+
+* `container.map === container.nodes.map`
+* `container.reduce === container.nodes.reduce`
+* `container.every === container.nodes.every`
+* `container.some === container.nodes.some`
+* `container.filter === container.nodes.filter`
+* `container.sort === container.nodes.sort`
+
+Note that these methods only work on a container's immediate children; recursive
+iteration is provided by `container.walk`.
+
+### `container.each(callback)`
+
+Iterate the container's immediate children, calling `callback` for each child.
+You may return `false` within the callback to break the iteration.
+
+```js
+var className;
+selectors.each(function (selector, index) {
+    if (selector.type === 'class') {
+        className = selector.value;
+        return false;
+    }
+});
+```
+
+Note that unlike `Array#forEach()`, this iterator is safe to use whilst adding
+or removing nodes from the container.
+
+Arguments:
+
+* `callback (function)`: A function to call for each node, which receives `node`
+  and `index` arguments.
+
+### `container.walk(callback)`
+
+Like `container#each`, but will also iterate child nodes as long as they are
+`container` types.
+
+```js
+selectors.walk(function (selector, index) {
+    // all nodes
+});
+```
+
+Arguments:
+
+* `callback (function)`: A function to call for each node, which receives `node`
+  and `index` arguments.
+
+This iterator is safe to use whilst mutating `container.nodes`,
+like `container#each`.
+
+### `container.walk` proxies
+
+The container class provides proxy methods for iterating over types of nodes,
+so that it is easier to write modules that target specific selectors. Those
+methods are:
+
+* `container.walkAttributes`
+* `container.walkClasses`
+* `container.walkCombinators`
+* `container.walkComments`
+* `container.walkIds`
+* `container.walkNesting`
+* `container.walkPseudos`
+* `container.walkTags`
+* `container.walkUniversals`
+
+### `container.split(callback)`
+
+This method allows you to split a group of nodes by returning `true` from
+a callback. It returns an array of arrays, where each inner array corresponds
+to the groups that you created via the callback.
+
+```js
+// (input) => h1 h2>>h3
+var list = selectors.first.split((selector) => {
+    return selector.type === 'combinator';
+});
+
+// (node values) => [['h1', ' '], ['h2', '>>'], ['h3']]
+```
+
+Arguments:
+
+* `callback (function)`: A function to call for each node, which receives `node`
+  as an argument.
+
+### `container.prepend(node)` & `container.append(node)`
+
+Add a node to the start/end of the container. Note that doing so will set
+the parent property of the node to this container.
+
+```js
+var id = parser.id({value: 'search'});
+selector.append(id);
+```
+
+Arguments:
+
+* `node`: The node to add.
+
+### `container.insertBefore(old, new)` & `container.insertAfter(old, new)`
+
+Add a node before or after an existing node in a container:
+
+```js
+selectors.walk(function (selector) {
+    if (selector.type !== 'class') {
+        var className = parser.className({value: 'theme-name'});
+        selector.parent.insertAfter(selector, className);
+    }
+});
+```
+
+Arguments:
+
+* `old`: The existing node in the container.
+* `new`: The new node to add before/after the existing node.
+
+### `container.removeChild(node)`
+
+Remove the node from the container. Note that you can also use
+`node.remove()` if you would like to remove just a single node.
+
+```js
+selector.length // => 2
+selector.remove(id)
+selector.length // => 1;
+id.parent       // undefined
+```
+
+Arguments:
+
+* `node`: The node to remove.
+
+### `container.removeAll()` or `container.empty()`
+
+Remove all children from the container.
+
+```js
+selector.removeAll();
+selector.length // => 0
+```
+
+## Root nodes
+
+A root node represents a comma separated list of selectors. Indeed, all
+a root's `toString()` method does is join its selector children with a ','.
+Other than this, it has no special functionality and acts like a container.
+
+### `root.trailingComma`
+
+This will be set to `true` if the input has a trailing comma, in order to
+support parsing of legacy CSS hacks.
+
+## Selector nodes
+
+A selector node represents a single compound selector. For example, this
+selector string `h1 h2 h3, [href] > p`, is represented as two selector nodes.
+It has no special functionality of its own.
+
+## Pseudo nodes
+
+A pseudo selector extends a container node; if it has any parameters of its
+own (such as `h1:not(h2, h3)`), they will be its children. Note that the pseudo
+`value` will always contain the colons preceding the pseudo identifier. This
+is so that both `:before` and `::before` are properly represented in the AST.
+
+## Attribute nodes
+
+### `attribute.quoted`
+
+Returns `true` if the attribute's value is wrapped in quotation marks, false if it is not.
+Remains `undefined` if there is no attribute value.
+
+```css
+[href=foo] /* false */
+[href='foo'] /* true */
+[href="foo"] /* true */
+[href] /* undefined */
+```
+
+### `attribute.raws.unquoted`
+
+Returns the unquoted content of the attribute's value.
+Remains `undefined` if there is no attribute value.
+
+```css
+[href=foo] /* foo */
+[href='foo'] /* foo */
+[href="foo"] /* foo */
+[href] /* undefined */
+```
+
+### `attribute.raws.insensitive`
+
+If there is an `i` specifying case insensitivity, returns that `i` along with the whitespace
+around it.
+
+```css
+[id=Bar i ] /* " i " */
+[id=Bar   i  ] /* "   i  " */
+```
+
+## `processor`
+
+### `process(cssText, [options])`
+
+Processes the `cssText`, returning the parsed output
+
+```js
+var processor = parser();
+
+var result = processor.process(' .class').result;
+// =>  .class
+
+// To have the parser normalize whitespace values, utilize the options
+var result = processor.process('  .class  ', {lossless: false}).result;
+// => .class
+```
+
+Arguments:
+
+* `cssText (string)`: The css to be parsed.
+* `[options] (object)`: Process options
+
+Options:
+
+* `lossless (boolean)`: false to normalize the selector whitespace, defaults to true