Source code
Revision control
Copy as Markdown
Other Tools
// Side-effects when calling ToLength(regExp.lastIndex) in
// RegExp.prototype[@@match] for non-global RegExp can recompile the RegExp.
for (var flag of ["", "y"]) {
var regExp = new RegExp("a", flag);
regExp.lastIndex = {
valueOf() {
regExp.compile("b");
return 0;
}
};
var result = regExp[Symbol.match]("b");
assertEq(result !== null, true);
}
// Recompilation modifies flag:
// Case 1: Adds global flag, validate by checking lastIndex.
var regExp = new RegExp("a", "");
regExp.lastIndex = {
valueOf() {
// |regExp| is now in global mode, RegExpBuiltinExec should update the
// lastIndex property to reflect last match.
regExp.compile("a", "g");
return 0;
}
};
regExp[Symbol.match]("a");
assertEq(regExp.lastIndex, 1);
// Case 2: Removes sticky flag with match, validate by checking lastIndex.
var regExp = new RegExp("a", "y");
regExp.lastIndex = {
valueOf() {
// |regExp| is no longer sticky, RegExpBuiltinExec shouldn't modify the
// lastIndex property.
regExp.compile("a", "");
regExp.lastIndex = 9000;
return 0;
}
};
regExp[Symbol.match]("a");
assertEq(regExp.lastIndex, 9000);
// Case 3.a: Removes sticky flag without match, validate by checking lastIndex.
var regExp = new RegExp("a", "y");
regExp.lastIndex = {
valueOf() {
// |regExp| is no longer sticky, RegExpBuiltinExec shouldn't modify the
// lastIndex property.
regExp.compile("b", "");
regExp.lastIndex = 9001;
return 0;
}
};
regExp[Symbol.match]("a");
assertEq(regExp.lastIndex, 9001);
// Case 3.b: Removes sticky flag without match, validate by checking lastIndex.
var regExp = new RegExp("a", "y");
regExp.lastIndex = {
valueOf() {
// |regExp| is no longer sticky, RegExpBuiltinExec shouldn't modify the
// lastIndex property.
regExp.compile("b", "");
regExp.lastIndex = 9002;
return 10000;
}
};
regExp[Symbol.match]("a");
assertEq(regExp.lastIndex, 9002);
if (typeof reportCompare === "function")
reportCompare(true, true);