3892b6e6ec
This allows passing an existing RegExp object (or an object that is sufficiently like a RegExp object) as the "pattern" argument of the RegExp constructor.
111 lines
3.1 KiB
C++
111 lines
3.1 KiB
C++
/*
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* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/RegExpConstructor.h>
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#include <LibJS/Runtime/RegExpObject.h>
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namespace JS {
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RegExpConstructor::RegExpConstructor(GlobalObject& global_object)
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: NativeFunction(vm().names.RegExp.as_string(), *global_object.function_prototype())
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{
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}
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void RegExpConstructor::initialize(GlobalObject& global_object)
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{
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auto& vm = this->vm();
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NativeFunction::initialize(global_object);
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// 22.2.4.1 RegExp.prototype, https://tc39.es/ecma262/#sec-regexp.prototype
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define_direct_property(vm.names.prototype, global_object.regexp_prototype(), 0);
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define_native_accessor(*vm.well_known_symbol_species(), symbol_species_getter, {}, Attribute::Configurable);
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define_direct_property(vm.names.length, Value(2), Attribute::Configurable);
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}
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RegExpConstructor::~RegExpConstructor()
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{
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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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Value RegExpConstructor::call()
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{
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auto& vm = this->vm();
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auto& global_object = this->global_object();
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auto pattern = vm.argument(0);
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auto flags = vm.argument(1);
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bool pattern_is_regexp = pattern.is_regexp(global_object);
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if (vm.exception())
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return {};
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if (pattern_is_regexp && flags.is_undefined()) {
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auto pattern_constructor = pattern.as_object().get(vm.names.constructor);
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if (vm.exception())
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return {};
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if (same_value(this, pattern_constructor))
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return pattern;
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}
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return construct(*this);
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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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Value RegExpConstructor::construct(FunctionObject&)
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{
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auto& vm = this->vm();
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auto& global_object = this->global_object();
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auto pattern = vm.argument(0);
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auto flags = vm.argument(1);
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bool pattern_is_regexp = pattern.is_regexp(global_object);
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if (vm.exception())
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return {};
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Value pattern_value;
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Value flags_value;
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if (pattern.is_object() && is<RegExpObject>(pattern.as_object())) {
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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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if (flags.is_undefined())
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flags_value = js_string(vm, regexp_pattern.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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pattern_value = pattern.as_object().get(vm.names.source);
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if (vm.exception())
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return {};
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if (flags.is_undefined()) {
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flags_value = pattern.as_object().get(vm.names.flags);
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if (vm.exception())
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return {};
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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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pattern_value = pattern;
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flags_value = flags;
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}
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return regexp_create(global_object, pattern_value, flags_value);
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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_GETTER(RegExpConstructor::symbol_species_getter)
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{
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return vm.this_value(global_object);
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}
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}
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