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