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Made regexps generated for empty character classes ("[]" and "[^]") work in IE.

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This commit is contained in:
David Majda 2010-04-14 21:08:35 +02:00
parent e79e869993
commit 6abda95a99
1 changed files with 13 additions and 1 deletions
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14
lib/compiler.js
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@ -734,6 +734,18 @@ PEG.Grammar.Literal.prototype.compile = function(resultVar) {
}; };
PEG.Grammar.Class.prototype.compile = function(resultVar) { PEG.Grammar.Class.prototype.compile = function(resultVar) {
/*
* Stupid IE considers regexps /[]/ and /[^]/ syntactically invalid, so we
* translate them into euqivalents it can handle.
*/
if (this._characters === "") {
var regexp = "/^(?!)/";
} else if (this._characters === "^") {
var regexp = "/^[\\S\\s]/";
} else {
var regexp = "/^[" + this._characters + "]/";
}
return PEG.Compiler.formatCode( return PEG.Compiler.formatCode(
"if (this._input.substr(this._pos).match(${regexp}) !== null) {", "if (this._input.substr(this._pos).match(${regexp}) !== null) {",
" var ${resultVar} = this._input[this._pos];", " var ${resultVar} = this._input[this._pos];",
@ -746,7 +758,7 @@ PEG.Grammar.Class.prototype.compile = function(resultVar) {
"}", "}",
{ {
characters: this._characters, characters: this._characters,
regexp: "/^[" + this._characters + "]/", regexp: regexp,
resultVar: resultVar resultVar: resultVar
} }
); );