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Showing content from https://github.com/dperini/nwmatcher below:

dperini/nwmatcher: Fast Javascript CSS Selector Engine and Matcher

A fast CSS selector engine and matcher.

To include NWMatcher in a standard web page:

<script type="text/javascript" src="nwmatcher.js"></script>

To use it with Node.js:

NWMatcher currently supports browsers (as a global, NW.Dom) and headless environments (as a CommonJS module).

Here is a list of all the CSS2/CSS3 Supported selectors.

You can read more about NWMatcher features and compliance on the wiki.

first( selector, context )

Returns a reference to the first element matching selector, starting at context.

match( element, selector, context )

Returns true if element matches selector, starting at context; returns false otherwise.

select( selector, context, callback )

Returns an array of all the elements matching selector, starting at context. If callback is provided, it is invoked for each matching element.

Returns a reference to the first element with ID id, optionally filtered to descendants of the element from.

Returns an array of elements having the specified tag name tag, optionally filtered to descendants of the element from.

Returns an array of elements having the specified class name class, optionally filtered to descendants of the element from.

Returns an array of elements having the specified value name for their name attribute, optionally filtered to descendants of the element from.

getAttribute( element, attribute )

Return the value read from the attribute of element with name attribute, as a string.

hasAttribute( element, attribute )

Returns true element has an attribute with name attribute set; returns false otherwise.

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:

CACHING: false - false to disable caching of result sets, true to enable
ESCAPECHR: true - true to allow CSS escaped identifiers, false to disallow
NON_ASCII: true - true to allow identifiers containing non-ASCII (utf-8) chars
SELECTOR3: true - switch syntax RE, true to use Level 3, false to use Level 2
UNICODE16: true - true to allow identifiers containing Unicode (utf-16) chars
SHORTCUTS: false - false to disable mangled selector strings like "+div" or "ul>"
SIMPLENOT: true - true to disallow complex selectors nested in ':not()' classes
SVG_LCASE: false - false to disable matching lowercase tag names of SVG elements
UNIQUE_ID: true - true to disallow multiple elements with the same id (strict)
USE_HTML5: true - true to use HTML5 specs for ":checked" and similar UI states
USE_QSAPI: true - true to use browsers native Query Selector API if available
VERBOSITY: true - true to throw exceptions, false to skip throwing exceptions
LOGERRORS: true - true to print console errors or warnings, false to mute them

Example:

NW.Dom.configure( { USE_QSAPI: false, VERBOSITY: false } );

registerOperator( symbol, resolver )

Registers a new symbol and its matching resolver in the operators table. Example:

NW.Dom.registerOperator( '!=', 'n!="%m"' );

registerSelector( name, rexp, func )

Registers a new selector, with the matching regular expression and the appropriate resolver function, in the selectors table.

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