You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
71 lines
2.3 KiB
71 lines
2.3 KiB
4 weeks ago
|
'use strict';
|
||
|
|
var $ = require('../internals/export');
|
||
|
|
var uncurryThis = require('../internals/function-uncurry-this');
|
||
|
|
var aString = require('../internals/a-string');
|
||
|
|
var hasOwn = require('../internals/has-own-property');
|
||
|
|
var padStart = require('../internals/string-pad').start;
|
||
|
|
var WHITESPACES = require('../internals/whitespaces');
|
||
|
|
|
||
|
|
var $Array = Array;
|
||
|
|
var $escape = RegExp.escape;
|
||
|
|
var charAt = uncurryThis(''.charAt);
|
||
|
|
var charCodeAt = uncurryThis(''.charCodeAt);
|
||
|
|
var numberToString = uncurryThis(1.1.toString);
|
||
|
|
var join = uncurryThis([].join);
|
||
|
|
var FIRST_DIGIT_OR_ASCII = /^[0-9a-z]/i;
|
||
|
|
var SYNTAX_SOLIDUS = /^[$()*+./?[\\\]^{|}]/;
|
||
|
|
var OTHER_PUNCTUATORS_AND_WHITESPACES = RegExp('^[!"#%&\',\\-:;<=>@`~' + WHITESPACES + ']');
|
||
|
|
var exec = uncurryThis(FIRST_DIGIT_OR_ASCII.exec);
|
||
|
|
|
||
|
|
var ControlEscape = {
|
||
|
|
'\u0009': 't',
|
||
|
|
'\u000A': 'n',
|
||
|
|
'\u000B': 'v',
|
||
|
|
'\u000C': 'f',
|
||
|
|
'\u000D': 'r'
|
||
|
|
};
|
||
|
|
|
||
|
|
var escapeChar = function (chr) {
|
||
|
|
var hex = numberToString(charCodeAt(chr, 0), 16);
|
||
|
|
return hex.length < 3 ? '\\x' + padStart(hex, 2, '0') : '\\u' + padStart(hex, 4, '0');
|
||
|
|
};
|
||
|
|
|
||
|
|
// Avoiding the use of polyfills of the previous iteration of this proposal
|
||
|
|
var FORCED = !$escape || $escape('ab') !== '\\x61b';
|
||
|
|
|
||
|
|
// `RegExp.escape` method
|
||
|
|
// https://github.com/tc39/proposal-regex-escaping
|
||
|
|
$({ target: 'RegExp', stat: true, forced: FORCED }, {
|
||
|
|
escape: function escape(S) {
|
||
|
|
aString(S);
|
||
|
|
var length = S.length;
|
||
|
|
var result = $Array(length);
|
||
|
|
|
||
|
|
for (var i = 0; i < length; i++) {
|
||
|
|
var chr = charAt(S, i);
|
||
|
|
if (i === 0 && exec(FIRST_DIGIT_OR_ASCII, chr)) {
|
||
|
|
result[i] = escapeChar(chr);
|
||
|
|
} else if (hasOwn(ControlEscape, chr)) {
|
||
|
|
result[i] = '\\' + ControlEscape[chr];
|
||
|
|
} else if (exec(SYNTAX_SOLIDUS, chr)) {
|
||
|
|
result[i] = '\\' + chr;
|
||
|
|
} else if (exec(OTHER_PUNCTUATORS_AND_WHITESPACES, chr)) {
|
||
|
|
result[i] = escapeChar(chr);
|
||
|
|
} else {
|
||
|
|
var charCode = charCodeAt(chr, 0);
|
||
|
|
// single UTF-16 code unit
|
||
|
|
if ((charCode & 0xF800) !== 0xD800) result[i] = chr;
|
||
|
|
// unpaired surrogate
|
||
|
|
else if (charCode >= 0xDC00 || i + 1 >= length || (charCodeAt(S, i + 1) & 0xFC00) !== 0xDC00) result[i] = escapeChar(chr);
|
||
|
|
// surrogate pair
|
||
|
|
else {
|
||
|
|
result[i] = chr;
|
||
|
|
result[++i] = charAt(S, i);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return join(result, '');
|
||
|
|
}
|
||
|
|
});
|