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var BUGNUMBER = 887016;
var summary = "Trace RegExp.prototype[@@split] behavior.";
print(BUGNUMBER + ": " + summary);
var n;
var log;
var target;
var flags;
var expectedFlags;
var execResult;
var lastIndexResult;
var lastIndexExpected;
var arraySetterObserved = false;
function startObserve() {
for (var i = 0; i < 10; i++) {
Object.defineProperty(Array.prototype, i, {
set: function(v) {
arraySetterObserved = true;
},
configurable: true,
});
}
}
function stopObserve() {
for (var i = 0; i < 10; i++)
delete Array.prototype[i]
}
startObserve();
function P(A) {
return new Proxy(A, {
get(that, name) {
log += "get:result[" + name + "],";
return that[name];
}
});
}
var myRegExp = {
get constructor() {
log += "get:constructor,";
return {
get [Symbol.species]() {
log += "get:species,";
return function(pattern, flags) {
assertEq(pattern, myRegExp);
assertEq(flags, expectedFlags);
log += "call:constructor,";
return {
get lastIndex() {
log += "get:lastIndex,";
return lastIndexResult[n];
},
set lastIndex(v) {
log += "set:lastIndex,";
assertEq(v, lastIndexExpected[n]);
},
get flags() {
log += "get:flags,";
return flags;
},
get exec() {
log += "get:exec,";
return function(S) {
log += "call:exec,";
assertEq(S, target);
return execResult[n++];
};
},
};
};
}
};
},
get flags() {
log += "get:flags,";
return flags;
},
};
function reset() {
n = 0;
log = "";
target = "abcde";
flags = "";
expectedFlags = "y";
arraySetterObserved = false;
}
// Trace match and no match.
reset();
execResult = [ null, P(["b"]), null, P(["d"]), null ];
lastIndexResult = [ , , 2, , 4, , ];
lastIndexExpected = [ 0, 1, 2, 3, 4, ];
var ret = RegExp.prototype[Symbol.split].call(myRegExp, target);
assertEq(arraySetterObserved, false);
assertEq(JSON.stringify(ret), `["a","c","e"]`);
assertEq(log,
"get:constructor," +
"get:species," +
"get:flags," +
"call:constructor," +
"set:lastIndex,get:exec,call:exec," +
"set:lastIndex,get:exec,call:exec,get:lastIndex," +
"get:result[length]," +
"set:lastIndex,get:exec,call:exec," +
"set:lastIndex,get:exec,call:exec,get:lastIndex," +
"get:result[length]," +
"set:lastIndex,get:exec,call:exec,");
// Trace non-empty flags, empty target, no match.
reset();
flags = "iy";
expectedFlags = "iy";
target = "";
execResult = [ null ];
lastIndexResult = [];
lastIndexExpected = [];
ret = RegExp.prototype[Symbol.split].call(myRegExp, target);
assertEq(arraySetterObserved, false);
assertEq(JSON.stringify(ret), `[""]`);
assertEq(log,
"get:constructor," +
"get:species," +
"get:flags," +
"call:constructor," +
"get:exec,call:exec,");
// Trace empty target, match.
reset();
target = "";
execResult = [ P([""]) ];
lastIndexResult = [];
lastIndexExpected = [];
ret = RegExp.prototype[Symbol.split].call(myRegExp, target);
assertEq(arraySetterObserved, false);
assertEq(JSON.stringify(ret), `[]`);
assertEq(log,
"get:constructor," +
"get:species," +
"get:flags," +
"call:constructor," +
"get:exec,call:exec,");
// Trace captures.
reset();
target = "abc";
execResult = [ null, P(["b", "X", "YZ"]), null ];
lastIndexResult = [ , , 2, , ];
lastIndexExpected = [ 0, 1, 2, ];
ret = RegExp.prototype[Symbol.split].call(myRegExp, target);
assertEq(arraySetterObserved, false);
assertEq(JSON.stringify(ret), `["a","X","YZ","c"]`);
assertEq(log,
"get:constructor," +
"get:species," +
"get:flags," +
"call:constructor," +
"set:lastIndex,get:exec,call:exec," +
"set:lastIndex,get:exec,call:exec,get:lastIndex," +
"get:result[length]," +
"get:result[1],get:result[2]," +
"set:lastIndex,get:exec,call:exec,");
// Trace unicode.
// 1. not surrogate pair
// 2. lead surrogate pair
// 3. trail surrogate pair
// 4. lead surrogate pair without trail surrogate pair
// 5. index overflow
reset();
flags = "u";
expectedFlags = "uy";
target = "-\uD83D\uDC38\uDC38\uD83D";
execResult = [ null, null, null, null ];
lastIndexResult = [ , , , , , ];
lastIndexExpected = [ 0, 1, 3, 4, ];
ret = RegExp.prototype[Symbol.split].call(myRegExp, target);
assertEq(arraySetterObserved, false);
assertEq(JSON.stringify(ret), `["-\uD83D\uDC38\\udc38\\ud83d"]`);
assertEq(log,
"get:constructor," +
"get:species," +
"get:flags," +
"call:constructor," +
"set:lastIndex,get:exec,call:exec," +
"set:lastIndex,get:exec,call:exec," +
"set:lastIndex,get:exec,call:exec," +
"set:lastIndex,get:exec,call:exec,");
// Trace unicode, match, same position and different position.
reset();
flags = "u";
expectedFlags = "uy";
target = "-\uD83D\uDC38\uDC38\uD83D";
var E = P(["", "X"]);
execResult = [ E, E, E, E, E, E, E ];
lastIndexResult = [ , 0, 1, 1, 3, 3, 4, 4 ];
lastIndexExpected = [ 0, 1, 1, 3, 3, 4, 4, ];
ret = RegExp.prototype[Symbol.split].call(myRegExp, target);
assertEq(arraySetterObserved, false);
assertEq(JSON.stringify(ret), `["-","X","\uD83D\uDC38","X","\\udc38","X","\\ud83d"]`);
assertEq(log,
"get:constructor," +
"get:species," +
"get:flags," +
"call:constructor," +
"set:lastIndex,get:exec,call:exec,get:lastIndex," +
"set:lastIndex,get:exec,call:exec,get:lastIndex," +
"get:result[length]," +
"get:result[1]," +
"set:lastIndex,get:exec,call:exec,get:lastIndex," +
"set:lastIndex,get:exec,call:exec,get:lastIndex," +
"get:result[length]," +
"get:result[1]," +
"set:lastIndex,get:exec,call:exec,get:lastIndex," +
"set:lastIndex,get:exec,call:exec,get:lastIndex," +
"get:result[length]," +
"get:result[1]," +
"set:lastIndex,get:exec,call:exec,get:lastIndex,");
stopObserve();
if (typeof reportCompare === "function")
reportCompare(true, true);