/** * @class Ext.String * * A collection of useful static methods to deal with strings * @singleton */ Ext.String = { trimRegex: /^[\x09\x0a\x0b\x0c\x0d\x20\xa0\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u2028\u2029\u202f\u205f\u3000]+|[\x09\x0a\x0b\x0c\x0d\x20\xa0\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u2028\u2029\u202f\u205f\u3000]+$/g, escapeRe: /('|\\)/g, formatRe: /\{(\d+)\}/g, escapeRegexRe: /([-.*+?^${}()|[\]\/\\])/g, /** * Convert certain characters (&, <, >, and ") to their HTML character equivalents for literal display in web pages. * @param {String} value The string to encode * @return {String} The encoded text * @method */ htmlEncode: (function() { var entities = { '&': '&', '>': '>', '<': '<', '"': '"' }, keys = [], p, regex; for (p in entities) { keys.push(p); } regex = new RegExp('(' + keys.join('|') + ')', 'g'); return function(value) { return (!value) ? value : String(value).replace(regex, function(match, capture) { return entities[capture]; }); }; })(), /** * Convert certain characters (&, <, >, and ") from their HTML character equivalents. * @param {String} value The string to decode * @return {String} The decoded text * @method */ htmlDecode: (function() { var entities = { '&': '&', '>': '>', '<': '<', '"': '"' }, keys = [], p, regex; for (p in entities) { keys.push(p); } regex = new RegExp('(' + keys.join('|') + '|&#[0-9]{1,5};' + ')', 'g'); return function(value) { return (!value) ? value : String(value).replace(regex, function(match, capture) { if (capture in entities) { return entities[capture]; } else { return String.fromCharCode(parseInt(capture.substr(2), 10)); } }); }; })(), /** * Appends content to the query string of a URL, handling logic for whether to place * a question mark or ampersand. * @param {String} url The URL to append to. * @param {String} string The content to append to the URL. * @return (String) The resulting URL */ urlAppend : function(url, string) { if (!Ext.isEmpty(string)) { return url + (url.indexOf('?') === -1 ? '?' : '&') + string; } return url; }, /** * Trims whitespace from either end of a string, leaving spaces within the string intact. Example: * @example var s = ' foo bar '; alert('-' + s + '-'); //alerts "- foo bar -" alert('-' + Ext.String.trim(s) + '-'); //alerts "-foo bar-" * @param {String} string The string to escape * @return {String} The trimmed string */ trim: function(string) { return string.replace(Ext.String.trimRegex, ""); }, /** * Capitalize the given string * @param {String} string * @return {String} */ capitalize: function(string) { return string.charAt(0).toUpperCase() + string.substr(1); }, /** * Truncate a string and add an ellipsis ('...') to the end if it exceeds the specified length * @param {String} value The string to truncate * @param {Number} length The maximum length to allow before truncating * @param {Boolean} word True to try to find a common word break * @return {String} The converted text */ ellipsis: function(value, len, word) { if (value && value.length > len) { if (word) { var vs = value.substr(0, len - 2), index = Math.max(vs.lastIndexOf(' '), vs.lastIndexOf('.'), vs.lastIndexOf('!'), vs.lastIndexOf('?')); if (index !== -1 && index >= (len - 15)) { return vs.substr(0, index) + "..."; } } return value.substr(0, len - 3) + "..."; } return value; }, /** * Escapes the passed string for use in a regular expression * @param {String} string * @return {String} */ escapeRegex: function(string) { return string.replace(Ext.String.escapeRegexRe, "\\$1"); }, /** * Escapes the passed string for ' and \ * @param {String} string The string to escape * @return {String} The escaped string */ escape: function(string) { return string.replace(Ext.String.escapeRe, "\\$1"); }, /** * Utility function that allows you to easily switch a string between two alternating values. The passed value * is compared to the current string, and if they are equal, the other value that was passed in is returned. If * they are already different, the first value passed in is returned. Note that this method returns the new value * but does not change the current string. * <pre><code> // alternate sort directions sort = Ext.String.toggle(sort, 'ASC', 'DESC'); // instead of conditional logic: sort = (sort == 'ASC' ? 'DESC' : 'ASC'); </code></pre> * @param {String} string The current string * @param {String} value The value to compare to the current string * @param {String} other The new value to use if the string already equals the first value passed in * @return {String} The new value */ toggle: function(string, value, other) { return string === value ? other : value; }, /** * Pads the left side of a string with a specified character. This is especially useful * for normalizing number and date strings. Example usage: * * <pre><code> var s = Ext.String.leftPad('123', 5, '0'); // s now contains the string: '00123' </code></pre> * @param {String} string The original string * @param {Number} size The total length of the output string * @param {String} character (optional) The character with which to pad the original string (defaults to empty string " ") * @return {String} The padded string */ leftPad: function(string, size, character) { var result = String(string); character = character || " "; while (result.length < size) { result = character + result; } return result; }, /** * Allows you to define a tokenized string and pass an arbitrary number of arguments to replace the tokens. Each * token must be unique, and must increment in the format {0}, {1}, etc. Example usage: * <pre><code> var cls = 'my-class', text = 'Some text'; var s = Ext.String.format('<div class="{0}">{1}</div>', cls, text); // s now contains the string: '<div class="my-class">Some text</div>' </code></pre> * @param {String} string The tokenized string to be formatted * @param {String} value1 The value to replace token {0} * @param {String} value2 Etc... * @return {String} The formatted string */ format: function(format) { var args = Ext.Array.toArray(arguments, 1); return format.replace(Ext.String.formatRe, function(m, i) { return args[i]; }); }, /** * Returns a string with a specified number of repititions a given string pattern. * The pattern be separated by a different string. * * var s = Ext.String.repeat('---', 4); // = '------------' * var t = Ext.String.repeat('--', 3, '/'); // = '--/--/--' * * @param {String} pattern The pattern to repeat. * @param {Number} count The number of times to repeat the pattern (may be 0). * @param {String} sep An option string to separate each pattern. */ repeat: function(pattern, count, sep) { for (var buf = [], i = count; i--; ) { buf.push(pattern); } return buf.join(sep || ''); } };