site/node_modules/style-to-object/dist/style-to-object.js

(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
	typeof define === 'function' && define.amd ? define(factory) :
	(global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.StyleToObject = factory());
})(this, (function () { 'use strict';

	function getDefaultExportFromCjs (x) {
		return x && x.__esModule && Object.prototype.hasOwnProperty.call(x, 'default') ? x['default'] : x;
	}

	// http://www.w3.org/TR/CSS21/grammar.html
	// https://github.com/visionmedia/css-parse/pull/49#issuecomment-30088027
	var COMMENT_REGEX = /\/\*[^*]*\*+([^/*][^*]*\*+)*\//g;

	var NEWLINE_REGEX = /\n/g;
	var WHITESPACE_REGEX = /^\s*/;

	// declaration
	var PROPERTY_REGEX = /^(\*?[-#/*\\\w]+(\[[0-9a-z_-]+\])?)\s*/;
	var COLON_REGEX = /^:\s*/;
	var VALUE_REGEX = /^((?:'(?:\\'|.)*?'|"(?:\\"|.)*?"|\([^)]*?\)|[^};])+)/;
	var SEMICOLON_REGEX = /^[;\s]*/;

	// https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String/Trim#Polyfill
	var TRIM_REGEX = /^\s+|\s+$/g;

	// strings
	var NEWLINE = '\n';
	var FORWARD_SLASH = '/';
	var ASTERISK = '*';
	var EMPTY_STRING = '';

	// types
	var TYPE_COMMENT = 'comment';
	var TYPE_DECLARATION = 'declaration';

	/**
	 * @param {String} style
	 * @param {Object} [options]
	 * @return {Object[]}
	 * @throws {TypeError}
	 * @throws {Error}
	 */
	var inlineStyleParser = function (style, options) {
	  if (typeof style !== 'string') {
	    throw new TypeError('First argument must be a string');
	  }

	  if (!style) return [];

	  options = options || {};

	  /**
	   * Positional.
	   */
	  var lineno = 1;
	  var column = 1;

	  /**
	   * Update lineno and column based on `str`.
	   *
	   * @param {String} str
	   */
	  function updatePosition(str) {
	    var lines = str.match(NEWLINE_REGEX);
	    if (lines) lineno += lines.length;
	    var i = str.lastIndexOf(NEWLINE);
	    column = ~i ? str.length - i : column + str.length;
	  }

	  /**
	   * Mark position and patch `node.position`.
	   *
	   * @return {Function}
	   */
	  function position() {
	    var start = { line: lineno, column: column };
	    return function (node) {
	      node.position = new Position(start);
	      whitespace();
	      return node;
	    };
	  }

	  /**
	   * Store position information for a node.
	   *
	   * @constructor
	   * @property {Object} start
	   * @property {Object} end
	   * @property {undefined|String} source
	   */
	  function Position(start) {
	    this.start = start;
	    this.end = { line: lineno, column: column };
	    this.source = options.source;
	  }

	  /**
	   * Non-enumerable source string.
	   */
	  Position.prototype.content = style;

	  /**
	   * Error `msg`.
	   *
	   * @param {String} msg
	   * @throws {Error}
	   */
	  function error(msg) {
	    var err = new Error(
	      options.source + ':' + lineno + ':' + column + ': ' + msg
	    );
	    err.reason = msg;
	    err.filename = options.source;
	    err.line = lineno;
	    err.column = column;
	    err.source = style;

	    if (options.silent) ; else {
	      throw err;
	    }
	  }

	  /**
	   * Match `re` and return captures.
	   *
	   * @param {RegExp} re
	   * @return {undefined|Array}
	   */
	  function match(re) {
	    var m = re.exec(style);
	    if (!m) return;
	    var str = m[0];
	    updatePosition(str);
	    style = style.slice(str.length);
	    return m;
	  }

	  /**
	   * Parse whitespace.
	   */
	  function whitespace() {
	    match(WHITESPACE_REGEX);
	  }

	  /**
	   * Parse comments.
	   *
	   * @param {Object[]} [rules]
	   * @return {Object[]}
	   */
	  function comments(rules) {
	    var c;
	    rules = rules || [];
	    while ((c = comment())) {
	      if (c !== false) {
	        rules.push(c);
	      }
	    }
	    return rules;
	  }

	  /**
	   * Parse comment.
	   *
	   * @return {Object}
	   * @throws {Error}
	   */
	  function comment() {
	    var pos = position();
	    if (FORWARD_SLASH != style.charAt(0) || ASTERISK != style.charAt(1)) return;

	    var i = 2;
	    while (
	      EMPTY_STRING != style.charAt(i) &&
	      (ASTERISK != style.charAt(i) || FORWARD_SLASH != style.charAt(i + 1))
	    ) {
	      ++i;
	    }
	    i += 2;

	    if (EMPTY_STRING === style.charAt(i - 1)) {
	      return error('End of comment missing');
	    }

	    var str = style.slice(2, i - 2);
	    column += 2;
	    updatePosition(str);
	    style = style.slice(i);
	    column += 2;

	    return pos({
	      type: TYPE_COMMENT,
	      comment: str
	    });
	  }

	  /**
	   * Parse declaration.
	   *
	   * @return {Object}
	   * @throws {Error}
	   */
	  function declaration() {
	    var pos = position();

	    // prop
	    var prop = match(PROPERTY_REGEX);
	    if (!prop) return;
	    comment();

	    // :
	    if (!match(COLON_REGEX)) return error("property missing ':'");

	    // val
	    var val = match(VALUE_REGEX);

	    var ret = pos({
	      type: TYPE_DECLARATION,
	      property: trim(prop[0].replace(COMMENT_REGEX, EMPTY_STRING)),
	      value: val
	        ? trim(val[0].replace(COMMENT_REGEX, EMPTY_STRING))
	        : EMPTY_STRING
	    });

	    // ;
	    match(SEMICOLON_REGEX);

	    return ret;
	  }

	  /**
	   * Parse declarations.
	   *
	   * @return {Object[]}
	   */
	  function declarations() {
	    var decls = [];

	    comments(decls);

	    // declarations
	    var decl;
	    while ((decl = declaration())) {
	      if (decl !== false) {
	        decls.push(decl);
	        comments(decls);
	      }
	    }

	    return decls;
	  }

	  whitespace();
	  return declarations();
	};

	/**
	 * Trim `str`.
	 *
	 * @param {String} str
	 * @return {String}
	 */
	function trim(str) {
	  return str ? str.replace(TRIM_REGEX, EMPTY_STRING) : EMPTY_STRING;
	}

	var parse = /*@__PURE__*/getDefaultExportFromCjs(inlineStyleParser);

	/**
	 * Parses inline style to object.
	 *
	 * @param style - Inline style.
	 * @param iterator - Iterator.
	 * @returns - Style object or null.
	 *
	 * @example Parsing inline style to object:
	 *
	 * ```js
	 * import parse from 'style-to-object';
	 * parse('line-height: 42;'); // { 'line-height': '42' }
	 * ```
	 */
	function StyleToObject(style, iterator) {
	    var styleObject = null;
	    if (!style || typeof style !== 'string') {
	        return styleObject;
	    }
	    var declarations = parse(style);
	    var hasIterator = typeof iterator === 'function';
	    declarations.forEach(function (declaration) {
	        if (declaration.type !== 'declaration') {
	            return;
	        }
	        var property = declaration.property, value = declaration.value;
	        if (hasIterator) {
	            iterator(property, value, declaration);
	        }
	        else if (value) {
	            styleObject = styleObject || {};
	            styleObject[property] = value;
	        }
	    });
	    return styleObject;
	}

	return StyleToObject;

}));
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