75 lines
2 KiB
JavaScript
75 lines
2 KiB
JavaScript
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'use strict';
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var NumberToString = require('./Number/toString');
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var StringIndexOf = require('./StringIndexOf');
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var StringPad = require('./StringPad');
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// var StringToCodePoints = require('./StringToCodePoints');
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var UnicodeEscape = require('./UnicodeEscape');
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var UTF16EncodeCodePoint = require('./UTF16EncodeCodePoint');
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var isLeadingSurrogate = require('../helpers/isLeadingSurrogate');
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var isTrailingSurrogate = require('../helpers/isTrailingSurrogate');
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var $TypeError = require('es-errors/type');
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var isCodePoint = require('../helpers/isCodePoint');
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var forEach = require('for-each');
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var regexTester = require('safe-regex-test');
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var isWhiteSpace = regexTester(/^\s$/);
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var isLineTerminator = regexTester(/^[\n\r\u2028\u2029]$/);
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// var punctuators = "(){}[]|,.?*+-^$=<>/#&!%:;@~'`\"\\"; // step 1
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var syntaxCharacter = '^$\\.*+?()[]{}|';
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var otherPunctuators = ",-=<>#&!%:;@~'`\""; // step 3
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// var toEscape = StringToCodePoints(otherPunctuators); // step 4
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var table64 = {
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'\u0009': 't',
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'\u000a': 'n',
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'\u000b': 'v',
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'\u000c': 'f',
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'\u000d': 'r',
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__proto__: null
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};
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module.exports = function EncodeForRegExpEscape(c) {
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if (!isCodePoint(c)) {
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throw new $TypeError('Assertion failed: `c` must be a valid Unicode code point');
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}
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var encoded = UTF16EncodeCodePoint(c);
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if (StringIndexOf(syntaxCharacter, encoded, 0) > -1 || encoded === '\u002F') { // step 1
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return '\\' + encoded; // step 1.a
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} else if (encoded in table64) { // step 2
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return '\\' + table64[encoded]; // step 2.a
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}
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if (
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StringIndexOf(otherPunctuators, encoded, 0) > -1
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|| isWhiteSpace(encoded)
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|| isLineTerminator(encoded)
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|| isLeadingSurrogate(c)
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|| isTrailingSurrogate(c)
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) { // step 5
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if (c < 0xFF) { // step 5.a
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var hex = NumberToString(c, 16); // step 5.a.i
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return '\\x' + StringPad(hex, 2, '0', 'START'); // step 5.a.ii
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}
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var escaped = ''; // step 5.b
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var codeUnits = encoded; // step 5.c
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forEach(codeUnits, function (cu) { // step 5.d
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escaped += UnicodeEscape(cu); // step 5.d.i
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});
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return escaped; // step 5.e
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}
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return encoded; // step 6
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};
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