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Only apply kludge from f48503cd31826f8cfb0f0e2b6964879dbe318385 when unicode regexps are not supported

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This commit is contained in:
Marijn Haverbeke 2014-10-27 10:54:46 +01:00
parent f48503cd31
commit 5d1db2e993
1 changed files with 7 additions and 3 deletions
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10
acorn.js
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@ -912,6 +912,10 @@
finishToken(type, str);
}
var regexpUnicodeSupport = false;
try { new RegExp("\uffff", "u"); regexpUnicodeSupport = true; }
catch(e) {}
// Parse a regular expression. Some context-awareness is necessary,
// since a '/' inside a '[]' set does not end the expression.
@ -939,14 +943,14 @@
var validFlags = /^[gmsiy]*$/;
if (options.ecmaVersion >= 6) validFlags = /^[gmsiyu]*$/;
if (!validFlags.test(mods)) raise(start, "Invalid regular expression flag");
if (mods.indexOf('u') >= 0) {
if (mods.indexOf('u') >= 0 && !regexpUnicodeSupport) {
// Replace each astral symbol and every Unicode code point
// escape sequence that represents such a symbol with a single
// ASCII symbol to avoid throwing on regular expressions that
// are only valid in combination with the `/u` flag.
tmp = tmp
.replace(/\\u\{([0-9a-fA-F]{5,6})\}/g, 'x')
.replace(/[\uD800-\uDBFF][\uDC00-\uDFFF]/g, 'x');
.replace(/\\u\{([0-9a-fA-F]{5,6})\}/g, "x")
.replace(/[\uD800-\uDBFF][\uDC00-\uDFFF]/g, "x");
}
}
// Detect invalid regular expressions.