/**

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* Word or character counting functionality. Count words or characters in a

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* provided text string.

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*

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* @namespace wp.utils

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*

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* @since 2.6.0

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* @output wp-admin/js/word-count.js

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*/

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( function() {

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/**

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* Word counting utility

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*

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* @namespace wp.utils.wordcounter

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* @memberof wp.utils

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*

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* @class

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*

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* @param {Object} settings Optional. Key-value object containing overrides for

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* settings.

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* @param {RegExp} settings.HTMLRegExp Optional. Regular expression to find HTML elements.

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* @param {RegExp} settings.HTMLcommentRegExp Optional. Regular expression to find HTML comments.

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* @param {RegExp} settings.spaceRegExp Optional. Regular expression to find irregular space

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* characters.

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* @param {RegExp} settings.HTMLEntityRegExp Optional. Regular expression to find HTML entities.

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* @param {RegExp} settings.connectorRegExp Optional. Regular expression to find connectors that

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* split words.

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* @param {RegExp} settings.removeRegExp Optional. Regular expression to find remove unwanted

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* characters to reduce false-positives.

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* @param {RegExp} settings.astralRegExp Optional. Regular expression to find unwanted

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* characters when searching for non-words.

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* @param {RegExp} settings.wordsRegExp Optional. Regular expression to find words by spaces.

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* @param {RegExp} settings.characters_excluding_spacesRegExp Optional. Regular expression to find characters which

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* are non-spaces.

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* @param {RegExp} settings.characters_including_spacesRegExp Optional. Regular expression to find characters

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* including spaces.

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* @param {RegExp} settings.shortcodesRegExp Optional. Regular expression to find shortcodes.

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* @param {Object} settings.l10n Optional. Localization object containing specific

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* configuration for the current localization.

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* @param {string} settings.l10n.type Optional. Method of finding words to count.

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* @param {Array} settings.l10n.shortcodes Optional. Array of shortcodes that should be removed

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* from the text.

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*

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* @return {void}

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*/

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function WordCounter( settings ) {

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var key,

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shortcodes;

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// Apply provided settings to object settings.

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if ( settings ) {

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for ( key in settings ) {

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// Only apply valid settings.

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if ( settings.hasOwnProperty( key ) ) {

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this.settings[ key ] = settings[ key ];

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}

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}

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}

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shortcodes = this.settings.l10n.shortcodes;

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// If there are any localization shortcodes, add this as type in the settings.

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if ( shortcodes && shortcodes.length ) {

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this.settings.shortcodesRegExp = new RegExp( '\\[\\/?(?:' + shortcodes.join( '|' ) + ')[^\\]]*?\\]', 'g' );

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}

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}

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// Default settings.

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WordCounter.prototype.settings = {

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HTMLRegExp: /<\/?[a-z][^>]*?>/gi,

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HTMLcommentRegExp: /<!--[\s\S]*?-->/g,

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spaceRegExp: /&nbsp;|&#160;/gi,

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HTMLEntityRegExp: /&\S+?;/g,

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// \u2014 = em-dash.

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connectorRegExp: /--|\u2014/g,

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// Characters to be removed from input text.

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removeRegExp: new RegExp( [

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'[',

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// Basic Latin (extract).

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'\u0021-\u0040\u005B-\u0060\u007B-\u007E',

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// Latin-1 Supplement (extract).

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'\u0080-\u00BF\u00D7\u00F7',

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/*

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* The following range consists of:

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* General Punctuation

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* Superscripts and Subscripts

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* Currency Symbols

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* Combining Diacritical Marks for Symbols

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* Letterlike Symbols

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* Number Forms

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* Arrows

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* Mathematical Operators

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* Miscellaneous Technical

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* Control Pictures

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* Optical Character Recognition

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* Enclosed Alphanumerics

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* Box Drawing

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* Block Elements

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* Geometric Shapes

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* Miscellaneous Symbols

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* Dingbats

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* Miscellaneous Mathematical Symbols-A

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* Supplemental Arrows-A

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* Braille Patterns

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* Supplemental Arrows-B

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* Miscellaneous Mathematical Symbols-B

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* Supplemental Mathematical Operators

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* Miscellaneous Symbols and Arrows

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*/

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'\u2000-\u2BFF',

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// Supplemental Punctuation.

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'\u2E00-\u2E7F',

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']'

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].join( '' ), 'g' ),

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// Remove UTF-16 surrogate points, see https://en.wikipedia.org/wiki/UTF-16#U.2BD800_to_U.2BDFFF

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astralRegExp: /[\uD800-\uDBFF][\uDC00-\uDFFF]/g,

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wordsRegExp: /\S\s+/g,

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characters_excluding_spacesRegExp: /\S/g,

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/*

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* Match anything that is not a formatting character, excluding:

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* \f = form feed

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* \n = new line

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* \r = carriage return

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* \t = tab

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* \v = vertical tab

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* \u00AD = soft hyphen

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* \u2028 = line separator

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* \u2029 = paragraph separator

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*/

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characters_including_spacesRegExp: /[^\f\n\r\t\v\u00AD\u2028\u2029]/g,

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l10n: window.wordCountL10n || {}

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};

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/**

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* Counts the number of words (or other specified type) in the specified text.

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*

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* @since 2.6.0

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*

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* @memberof wp.utils.wordcounter

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*

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* @param {string} text Text to count elements in.

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* @param {string} type Optional. Specify type to use.

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*

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* @return {number} The number of items counted.

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*/

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WordCounter.prototype.count = function( text, type ) {

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var count = 0;

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// Use default type if none was provided.

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type = type || this.settings.l10n.type;

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// Sanitize type to one of three possibilities: 'words', 'characters_excluding_spaces' or 'characters_including_spaces'.

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if ( type !== 'characters_excluding_spaces' && type !== 'characters_including_spaces' ) {

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type = 'words';

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}

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// If we have any text at all.

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if ( text ) {

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text = text + '\n';

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// Replace all HTML with a new-line.

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text = text.replace( this.settings.HTMLRegExp, '\n' );

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// Remove all HTML comments.

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text = text.replace( this.settings.HTMLcommentRegExp, '' );

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// If a shortcode regular expression has been provided use it to remove shortcodes.

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if ( this.settings.shortcodesRegExp ) {

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text = text.replace( this.settings.shortcodesRegExp, '\n' );

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}

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// Normalize non-breaking space to a normal space.

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text = text.replace( this.settings.spaceRegExp, ' ' );

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if ( type === 'words' ) {

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// Remove HTML Entities.

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text = text.replace( this.settings.HTMLEntityRegExp, '' );

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// Convert connectors to spaces to count attached text as words.

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text = text.replace( this.settings.connectorRegExp, ' ' );

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// Remove unwanted characters.

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text = text.replace( this.settings.removeRegExp, '' );

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} else {

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// Convert HTML Entities to "a".

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text = text.replace( this.settings.HTMLEntityRegExp, 'a' );

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// Remove surrogate points.

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text = text.replace( this.settings.astralRegExp, 'a' );

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}

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// Match with the selected type regular expression to count the items.

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text = text.match( this.settings[ type + 'RegExp' ] );

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// If we have any matches, set the count to the number of items found.

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if ( text ) {

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count = text.length;

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}

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}

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return count;

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};

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// Add the WordCounter to the WP Utils.

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window.wp = window.wp || {};

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window.wp.utils = window.wp.utils || {};

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window.wp.utils.WordCounter = WordCounter;

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} )();

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