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node_modules/nwsapi/README.md

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+# [NWSAPI](http://dperini.github.io/nwsapi/)
+
+Fast CSS Selectors API Engine
+
+![](https://img.shields.io/npm/v/nwsapi.svg?colorB=orange&style=flat) ![](https://img.shields.io/github/tag/dperini/nwsapi.svg?style=flat) ![](https://img.shields.io/npm/dw/nwsapi.svg?style=flat) ![](https://img.shields.io/github/issues/dperini/nwsapi.svg?style=flat)
+
+NWSAPI is the development progress of [NWMATCHER](https://github.com/dperini/nwmatcher) aiming at [Selectors Level 4](https://www.w3.org/TR/selectors-4/) conformance. It has been completely reworked to be easily extended and maintained. It is a right-to-left selector parser and compiler written in pure Javascript with no external dependencies. It was initially thought as a cross browser library to improve event delegation and web page scraping in various frameworks but it has become a popular replacement of the native CSS selection and matching functionality in newer browsers and headless environments.
+
+It uses [regular expressions](https://en.wikipedia.org/wiki/Regular_expression) to parse CSS selector strings and [metaprogramming](https://en.wikipedia.org/wiki/Metaprogramming) to transforms these selector strings into Javascript function resolvers. This process is executed only once for each selector string allowing memoization of the function resolvers and achieving unmatched performances.
+
+## Installation
+
+To include NWSAPI in a standard web page:
+
+```html
+<script type="text/javascript" src="nwsapi.js"></script>
+```
+
+To include NWSAPI in a standard web page and automatically replace the native QSA:
+
+```html
+<script type="text/javascript" src="nwsapi.js" onload="NW.Dom.install()"></script>
+```
+
+To use NWSAPI with Node.js:
+
+```
+$ npm install nwsapi
+```
+
+NWSAPI currently supports browsers (as a global, `NW.Dom`) and headless environments (as a CommonJS module).
+
+
+## Supported Selectors
+
+Here is a list of all the CSS2/CSS3/CSS4 [Supported selectors](https://github.com/dperini/nwsapi/wiki/CSS-supported-selectors).
+
+
+## Features and Compliance
+
+You can read more about NWSAPI [features and compliance](https://github.com/dperini/nwsapi/wiki/Features-and-compliance) on the wiki.
+
+
+## API
+
+### DOM Selection
+
+#### `ancestor( selector, context, callback )`
+
+Returns a reference to the nearest ancestor element matching `selector`, starting at `context`. Returns `null` if no element is found. If `callback` is provided, it is invoked for the matched element.
+
+#### `first( selector, context, callback )`
+
+Returns a reference to the first element matching `selector`, starting at `context`. Returns `null` if no element matches. If `callback` is provided, it is invoked for the matched element.
+
+#### `match( selector, element, callback )`
+
+Returns `true` if `element` matches `selector`, starting at `context`; returns `false` otherwise. If `callback` is provided, it is invoked for the matched element.
+
+#### `select( selector, context, callback )`
+
+Returns an array of all the elements matching `selector`, starting at `context`; returns empty `Array` otherwise. If `callback` is provided, it is invoked for each matching element.
+
+
+### DOM Helpers
+
+#### `byId( id, from )`
+
+Returns a reference to the first element with ID `id`, optionally filtered to descendants of the element `from`.
+
+#### `byTag( tag, from )`
+
+Returns an array of elements having the specified tag name `tag`, optionally filtered to descendants of the element `from`.
+
+#### `byClass( class, from )`
+
+Returns an array of elements having the specified class name `class`, optionally filtered to descendants of the element `from`.
+
+
+### Engine Configuration
+
+#### `configure( options )`
+
+The following is the list of currently available configuration options, their default values and descriptions, they are boolean flags that can be set to `true` or `false`:
+
+* `IDS_DUPES`: true  - true to allow using multiple elements having the same id, false to disallow
+* `LIVECACHE`: true  - true for caching both results and resolvers, false for caching only resolvers
+* `MIXEDCASE`: true  - true to match tag names case insensitive, false to match using case sensitive
+* `LOGERRORS`: true  - true to print errors and warnings to the console, false to mute both of them
+
+
+### Examples on extending the basic functionalities
+
+#### `configure( { <configuration-flag>: [ true | false ] } )`
+
+Disable logging errors/warnings to console, disallow duplicate ids. Example:
+
+```js
+NW.Dom.configure( { LOGERRORS: false, IDS_DUPES: false } );
+```
+NOTE: NW.Dom.configure() without parameters return the current configuration.
+
+#### `registerCombinator( symbol, resolver )`
+
+Registers a new symbol and its matching resolver in the combinators table. Example:
+
+```js
+NW.Dom.registerCombinator( '^', 'e.parentElement' );
+```
+
+#### `registerOperator( symbol, resolver )`
+
+Registers a new symbol and its matching resolver in the attribute operators table. Example:
+
+```js
+NW.Dom.registerOperator( '!=', { p1: '^', p2: '$', p3: 'false' } );
+```
+
+#### `registerSelector( name, rexp, func )`
+
+Registers a new selector, the matching RE and the resolver function, in the selectors table. Example:
+
+```js
+NW.Dom.registerSelector('Controls', /^\:(control)(.*)/i,
+  (function(global) {
+    return function(match, source, mode, callback) {
+      var status = true;
+      source = 'if(/^(button|input|select|textarea)/i.test(e.nodeName)){' + source + '}';
+      return { 'source': source, 'status': status };
+    };
+  })(this));
+```