119 lines
3.8 KiB
JavaScript
119 lines
3.8 KiB
JavaScript
/*! https://mths.be/cssesc v1.0.1 by @mathias */
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'use strict';
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var object = {};
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var hasOwnProperty = object.hasOwnProperty;
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var merge = function merge(options, defaults) {
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if (!options) {
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return defaults;
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}
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var result = {};
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for (var key in defaults) {
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// `if (defaults.hasOwnProperty(key) { … }` is not needed here, since
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// only recognized option names are used.
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result[key] = hasOwnProperty.call(options, key) ? options[key] : defaults[key];
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}
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return result;
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};
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var regexAnySingleEscape = /[ -,\.\/;-@\[-\^`\{-~]/;
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var regexSingleEscape = /[ -,\.\/;-@\[\]\^`\{-~]/;
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var regexAlwaysEscape = /['"\\]/;
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var regexExcessiveSpaces = /(^|\\+)?(\\[A-F0-9]{1,6})\x20(?![a-fA-F0-9\x20])/g;
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// https://mathiasbynens.be/notes/css-escapes#css
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var cssesc = function cssesc(string, options) {
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options = merge(options, cssesc.options);
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if (options.quotes != 'single' && options.quotes != 'double') {
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options.quotes = 'single';
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}
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var quote = options.quotes == 'double' ? '"' : '\'';
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var isIdentifier = options.isIdentifier;
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var firstChar = string.charAt(0);
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var output = '';
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var counter = 0;
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var length = string.length;
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while (counter < length) {
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var character = string.charAt(counter++);
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var codePoint = character.charCodeAt();
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var value = void 0;
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// If it’s not a printable ASCII character…
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if (codePoint < 0x20 || codePoint > 0x7E) {
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if (codePoint >= 0xD800 && codePoint <= 0xDBFF && counter < length) {
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// It’s a high surrogate, and there is a next character.
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var extra = string.charCodeAt(counter++);
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if ((extra & 0xFC00) == 0xDC00) {
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// next character is low surrogate
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codePoint = ((codePoint & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000;
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} else {
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// It’s an unmatched surrogate; only append this code unit, in case
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// the next code unit is the high surrogate of a surrogate pair.
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counter--;
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}
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}
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value = '\\' + codePoint.toString(16).toUpperCase() + ' ';
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} else {
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if (options.escapeEverything) {
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if (regexAnySingleEscape.test(character)) {
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value = '\\' + character;
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} else {
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value = '\\' + codePoint.toString(16).toUpperCase() + ' ';
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}
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// Note: `:` could be escaped as `\:`, but that fails in IE < 8.
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} else if (/[\t\n\f\r\x0B:]/.test(character)) {
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if (!isIdentifier && character == ':') {
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value = character;
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} else {
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value = '\\' + codePoint.toString(16).toUpperCase() + ' ';
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}
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} else if (character == '\\' || !isIdentifier && (character == '"' && quote == character || character == '\'' && quote == character) || isIdentifier && regexSingleEscape.test(character)) {
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value = '\\' + character;
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} else {
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value = character;
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}
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}
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output += value;
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}
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if (isIdentifier) {
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if (/^_/.test(output)) {
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// Prevent IE6 from ignoring the rule altogether (in case this is for an
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// identifier used as a selector)
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output = '\\_' + output.slice(1);
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} else if (/^-[-\d]/.test(output)) {
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output = '\\-' + output.slice(1);
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} else if (/\d/.test(firstChar)) {
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output = '\\3' + firstChar + ' ' + output.slice(1);
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}
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}
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// Remove spaces after `\HEX` escapes that are not followed by a hex digit,
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// since they’re redundant. Note that this is only possible if the escape
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// sequence isn’t preceded by an odd number of backslashes.
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output = output.replace(regexExcessiveSpaces, function ($0, $1, $2) {
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if ($1 && $1.length % 2) {
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// It’s not safe to remove the space, so don’t.
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return $0;
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}
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// Strip the space.
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return ($1 || '') + $2;
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});
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if (!isIdentifier && options.wrap) {
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return quote + output + quote;
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}
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return output;
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};
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// Expose default options (so they can be overridden globally).
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cssesc.options = {
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'escapeEverything': false,
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'isIdentifier': false,
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'quotes': 'single',
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'wrap': false
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};
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cssesc.version = '1.0.1';
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module.exports = cssesc;
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