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var BUGNUMBER = 887016;
var summary = "Trace RegExp.prototype[@@match] behavior.";
print(BUGNUMBER + ": " + summary);
var n;
var log;
var target;
var global;
var unicode;
var logProxy;
var execResult;
var lastIndexResult;
var lastIndexExpected;
function P(A) {
return new Proxy(A, {
get(that, name) {
if (logProxy)
log += "get:result[" + name + "],";
return that[name];
}
});
}
var myRegExp = {
get flags() {
log += "get:flags,";
var flags = "";
if (global) flags += "g";
if (unicode) flags += "u";
return flags;
},
get lastIndex() {
log += "get:lastIndex,";
return lastIndexResult[n];
},
set lastIndex(v) {
log += "set:lastIndex,";
assertEq(v, lastIndexExpected[n]);
},
get exec() {
log += "get:exec,";
return function(S) {
log += "call:exec,";
assertEq(S, target);
return execResult[n++];
};
},
};
function reset() {
n = 0;
log = "";
target = "abcAbcABC";
global = true;
unicode = false;
logProxy = true;
}
// Trace global with non-empty match.
reset();
execResult = [ P(["abc"]), P(["ABC"]), null ];
lastIndexResult = [ , , , ];
lastIndexExpected = [ 0, , , ];
var ret = RegExp.prototype[Symbol.match].call(myRegExp, target);
assertEq(JSON.stringify(ret), `["abc","ABC"]`);
assertEq(log,
"get:flags," +
"set:lastIndex," +
"get:exec,call:exec,get:result[0]," +
"get:exec,call:exec,get:result[0]," +
"get:exec,call:exec,");
// Trace global with empty match.
reset();
execResult = [ P([""]), P([""]), null ];
lastIndexResult = [ , 4, 20, ];
lastIndexExpected = [ 0, 5, 21, ];
ret = RegExp.prototype[Symbol.match].call(myRegExp, target);
assertEq(JSON.stringify(ret), `["",""]`);
assertEq(log,
"get:flags," +
"set:lastIndex," +
"get:exec,call:exec,get:result[0],get:lastIndex,set:lastIndex," +
"get:exec,call:exec,get:result[0],get:lastIndex,set:lastIndex," +
"get:exec,call:exec,");
// Trace global and unicode with empty match.
// 1. not surrogate pair
// 2. lead surrogate pair
// 3. trail surrogate pair
// 4. lead surrogate pair without trail surrogate pair
// 5. index overflow
reset();
unicode = true;
// 0123 4 5678
target = "___\uD83D\uDC38___\uD83D";
execResult = [ P([""]), P([""]), P([""]), P([""]), P([""]), null ];
lastIndexResult = [ , 2, 3, 4, 8, 9, ];
lastIndexExpected = [ 0, 3, 5, 5, 9, 10, ];
ret = RegExp.prototype[Symbol.match].call(myRegExp, target);
assertEq(JSON.stringify(ret), `["","","","",""]`);
assertEq(log,
"get:flags," +
"set:lastIndex," +
"get:exec,call:exec,get:result[0],get:lastIndex,set:lastIndex," +
"get:exec,call:exec,get:result[0],get:lastIndex,set:lastIndex," +
"get:exec,call:exec,get:result[0],get:lastIndex,set:lastIndex," +
"get:exec,call:exec,get:result[0],get:lastIndex,set:lastIndex," +
"get:exec,call:exec,get:result[0],get:lastIndex,set:lastIndex," +
"get:exec,call:exec,");
// Trace global with no match.
reset();
execResult = [ null ];
lastIndexResult = [ , ];
lastIndexExpected = [ 0, ];
ret = RegExp.prototype[Symbol.match].call(myRegExp, target);
assertEq(ret, null);
assertEq(log,
"get:flags," +
"set:lastIndex," +
"get:exec,call:exec,");
// Trace non-global.
reset();
global = false;
execResult = [ P(["abc"]) ];
lastIndexResult = [];
lastIndexExpected = [];
ret = RegExp.prototype[Symbol.match].call(myRegExp, target);
// ret is the Proxy on non-global case, disable logging.
logProxy = false;
assertEq(JSON.stringify(ret), `["abc"]`);
assertEq(log,
"get:flags," +
"get:exec,call:exec,");
if (typeof reportCompare === "function")
reportCompare(true, true);