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support optional chaining operator (#4899)

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This commit is contained in:
Alex Lam S.L
2021-05-03 03:08:29 +01:00
committed by GitHub
parent 203f4b7ad9
commit f0de9a8b5d
12 changed files with 353 additions and 71 deletions
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24
test/ufuzz/index.js
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@@ -152,6 +152,7 @@ var SUPPORT = function(matrix) {
logical_assignment: "[].p ??= 0;",
new_target: "function f() { new.target; }",
nullish: "0 ?? 0",
optional_chaining: "0?.p",
rest: "var [...a] = [];",
rest_object: "var {...a} = {};",
spread: "[...[]];",
@@ -1487,12 +1488,16 @@ function _createExpression(recurmax, noComma, stmtDepth, canThrow) {
return createValue() + " in " + createObjectLiteral(recurmax, stmtDepth, canThrow);
case p++:
var name = getVarName();
var s = name + "[" + createExpression(recurmax, COMMA_OK, stmtDepth, canThrow) + "]";
return canThrow && rng(20) == 0 ? s : name + " && " + s;
var prop = "[" + createExpression(recurmax, COMMA_OK, stmtDepth, canThrow) + "]";
if (SUPPORT.optional_chaining && rng(50) == 0) return name + "?." + prop;
if (canThrow && rng(20) == 0) return name + prop;
return name + " && " + name + prop;
case p++:
var name = getVarName();
var s = name + "." + getDotKey();
return canThrow && rng(20) == 0 ? s : name + " && " + s;
var prop = getDotKey();
if (SUPPORT.optional_chaining && rng(50) == 0) return name + "?." + prop;
if (canThrow && rng(20) == 0) return name + "." + prop;
return name + " && " + name + "." + prop;
case p++:
case p++:
var name = getVarName();
@@ -1534,7 +1539,16 @@ function _createExpression(recurmax, noComma, stmtDepth, canThrow) {
name = rng(3) == 0 ? getVarName() : "f" + rng(funcs + 2);
} while (name in called && !called[name]);
called[name] = true;
return mayDefer("typeof " + name + ' == "function" && --_calls_ >= 0 && ' + name + createArgs(recurmax, stmtDepth, canThrow));
var args = createArgs(recurmax, stmtDepth, canThrow);
var call = "typeof " + name + ' == "function" && --_calls_ >= 0 && ' + name + args;
if (canThrow) {
if (SUPPORT.optional_chaining && args[0] != "`" && rng(50) == 0) {
call = name + "?." + args;
} else if (rng(20) == 0) {
call = name + args;
}
}
return mayDefer(call);
}
_createExpression.N = p;
return _createExpression(recurmax, noComma, stmtDepth, canThrow);