cssesc.js
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/*! https://mths.be/cssesc v3.0.0 by @mathias */
'use strict';
var object = {};
var hasOwnProperty = object.hasOwnProperty;
var merge = function merge(options, defaults) {
if (!options) {
return defaults;
}
var result = {};
for (var key in defaults) {
// `if (defaults.hasOwnProperty(key) { … }` is not needed here, since
// only recognized option names are used.
result[key] = hasOwnProperty.call(options, key) ? options[key] : defaults[key];
}
return result;
};
var regexAnySingleEscape = /[ -,\.\/:-@\[-\^`\{-~]/;
var regexSingleEscape = /[ -,\.\/:-@\[\]\^`\{-~]/;
var regexAlwaysEscape = /['"\\]/;
var regexExcessiveSpaces = /(^|\\+)?(\\[A-F0-9]{1,6})\x20(?![a-fA-F0-9\x20])/g;
// https://mathiasbynens.be/notes/css-escapes#css
var cssesc = function cssesc(string, options) {
options = merge(options, cssesc.options);
if (options.quotes != 'single' && options.quotes != 'double') {
options.quotes = 'single';
}
var quote = options.quotes == 'double' ? '"' : '\'';
var isIdentifier = options.isIdentifier;
var firstChar = string.charAt(0);
var output = '';
var counter = 0;
var length = string.length;
while (counter < length) {
var character = string.charAt(counter++);
var codePoint = character.charCodeAt();
var value = void 0;
// If it’s not a printable ASCII character…
if (codePoint < 0x20 || codePoint > 0x7E) {
if (codePoint >= 0xD800 && codePoint <= 0xDBFF && counter < length) {
// It’s a high surrogate, and there is a next character.
var extra = string.charCodeAt(counter++);
if ((extra & 0xFC00) == 0xDC00) {
// next character is low surrogate
codePoint = ((codePoint & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000;
} else {
// It’s an unmatched surrogate; only append this code unit, in case
// the next code unit is the high surrogate of a surrogate pair.
counter--;
}
}
value = '\\' + codePoint.toString(16).toUpperCase() + ' ';
} else {
if (options.escapeEverything) {
if (regexAnySingleEscape.test(character)) {
value = '\\' + character;
} else {
value = '\\' + codePoint.toString(16).toUpperCase() + ' ';
}
} else if (/[\t\n\f\r\x0B]/.test(character)) {
value = '\\' + codePoint.toString(16).toUpperCase() + ' ';
} else if (character == '\\' || !isIdentifier && (character == '"' && quote == character || character == '\'' && quote == character) || isIdentifier && regexSingleEscape.test(character)) {
value = '\\' + character;
} else {
value = character;
}
}
output += value;
}
if (isIdentifier) {
if (/^-[-\d]/.test(output)) {
output = '\\-' + output.slice(1);
} else if (/\d/.test(firstChar)) {
output = '\\3' + firstChar + ' ' + output.slice(1);
}
}
// Remove spaces after `\HEX` escapes that are not followed by a hex digit,
// since they’re redundant. Note that this is only possible if the escape
// sequence isn’t preceded by an odd number of backslashes.
output = output.replace(regexExcessiveSpaces, function ($0, $1, $2) {
if ($1 && $1.length % 2) {
// It’s not safe to remove the space, so don’t.
return $0;
}
// Strip the space.
return ($1 || '') + $2;
});
if (!isIdentifier && options.wrap) {
return quote + output + quote;
}
return output;
};
// Expose default options (so they can be overridden globally).
cssesc.options = {
'escapeEverything': false,
'isIdentifier': false,
'quotes': 'single',
'wrap': false
};
cssesc.version = '3.0.0';
module.exports = cssesc;