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LibJS: Add spec comments to RegExpConstructor

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Linus Groh 2022-10-16 15:05:48 +02:00
parent 1da66b5879
commit eb5be649a5
1 changed files with 38 additions and 6 deletions
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44
Userland/Libraries/LibJS/Runtime/RegExpConstructor.cpp
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@ -37,59 +37,91 @@ ThrowCompletionOr<Value> RegExpConstructor::call()
auto pattern = vm.argument(0);
auto flags = vm.argument(1);
// 1. Let patternIsRegExp be ? IsRegExp(pattern).
bool pattern_is_regexp = TRY(pattern.is_regexp(vm));
// 2. If NewTarget is undefined, then
// a. Let newTarget be the active function object.
auto& new_target = *this;
// b. If patternIsRegExp is true and flags is undefined, then
if (pattern_is_regexp && flags.is_undefined()) {
// i. Let patternConstructor be ? Get(pattern, "constructor").
auto pattern_constructor = TRY(pattern.as_object().get(vm.names.constructor));
if (same_value(this, pattern_constructor))
// ii. If SameValue(newTarget, patternConstructor) is true, return pattern.
if (same_value(&new_target, pattern_constructor))
return pattern;
}
return TRY(construct(*this));
return TRY(construct(new_target));
}
// 22.2.3.1 RegExp ( pattern, flags ), https://tc39.es/ecma262/#sec-regexp-pattern-flags
ThrowCompletionOr<Object*> RegExpConstructor::construct(FunctionObject&)
ThrowCompletionOr<Object*> RegExpConstructor::construct(FunctionObject& new_target)
{
auto& vm = this->vm();
auto pattern = vm.argument(0);
auto flags = vm.argument(1);
// 1. Let patternIsRegExp be ? IsRegExp(pattern).
bool pattern_is_regexp = TRY(pattern.is_regexp(vm));
// NOTE: Step 2 is handled in call() above.
// 3. Else, let newTarget be NewTarget.
Value pattern_value;
Value flags_value;
// 4. If pattern is an Object and pattern has a [[RegExpMatcher]] internal slot, then
if (pattern.is_object() && is<RegExpObject>(pattern.as_object())) {
// a. Let P be pattern.[[OriginalSource]].
auto& regexp_pattern = static_cast<RegExpObject&>(pattern.as_object());
pattern_value = js_string(vm, regexp_pattern.pattern());
// b. If flags is undefined, let F be pattern.[[OriginalFlags]].
if (flags.is_undefined())
flags_value = js_string(vm, regexp_pattern.flags());
// c. Else, let F be flags.
else
flags_value = flags;
} else if (pattern_is_regexp) {
}
// 5. Else if patternIsRegExp is true, then
else if (pattern_is_regexp) {
// a. Let P be ? Get(pattern, "source").
pattern_value = TRY(pattern.as_object().get(vm.names.source));
// b. If flags is undefined, then
if (flags.is_undefined()) {
// i. Let F be ? Get(pattern, "flags").
flags_value = TRY(pattern.as_object().get(vm.names.flags));
} else {
}
// c. Else, let F be flags.
else {
flags_value = flags;
}
} else {
}
// 6. Else,
else {
// a. Let P be pattern.
pattern_value = pattern;
// b. Let F be flags.
flags_value = flags;
}
// 7. Let O be ? RegExpAlloc(newTarget).
auto regexp_object = TRY(regexp_alloc(vm, new_target));
// 8. Return ? RegExpInitialize(O, P, F).
return TRY(regexp_object->regexp_initialize(vm, pattern_value, flags_value)).ptr();
}
// 22.2.4.2 get RegExp [ @@species ], https://tc39.es/ecma262/#sec-get-regexp-@@species
JS_DEFINE_NATIVE_FUNCTION(RegExpConstructor::symbol_species_getter)
{
// 1. Return the this value.
return vm.this_value();
}