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/*
* Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/IteratorOperations.h>
namespace JS {
Object* get_iterator(GlobalObject& global_object, Value value, String hint, Value method)
{
auto& vm = global_object.vm();
VERIFY(hint == "sync" || hint == "async");
if (method.is_empty()) {
if (hint == "async")
TODO();
auto object = value.to_object(global_object);
if (!object)
return {};
method = object->get(global_object.vm().well_known_symbol_iterator());
if (vm.exception())
return {};
}
if (!method.is_function()) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotIterable, value.to_string_without_side_effects());
return nullptr;
}
auto iterator = vm.call(method.as_function(), value);
if (vm.exception())
return {};
if (!iterator.is_object()) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotIterable, value.to_string_without_side_effects());
return nullptr;
}
return &iterator.as_object();
}
Object* iterator_next(Object& iterator, Value value)
{
auto& vm = iterator.vm();
auto& global_object = iterator.global_object();
auto next_method = iterator.get(vm.names.next);
if (vm.exception())
return {};
if (!next_method.is_function()) {
vm.throw_exception<TypeError>(global_object, ErrorType::IterableNextNotAFunction);
return nullptr;
}
Value result;
if (value.is_empty())
result = vm.call(next_method.as_function(), &iterator);
else
result = vm.call(next_method.as_function(), &iterator, value);
if (vm.exception())
return {};
if (!result.is_object()) {
vm.throw_exception<TypeError>(global_object, ErrorType::IterableNextBadReturn);
return nullptr;
}
return &result.as_object();
}
void iterator_close([[maybe_unused]] Object& iterator)
{
TODO();
}
Value create_iterator_result_object(GlobalObject& global_object, Value value, bool done)
{
auto& vm = global_object.vm();
auto* object = Object::create_empty(global_object);
object->define_property(vm.names.value, value);
object->define_property(vm.names.done, Value(done));
return object;
}
void get_iterator_values(GlobalObject& global_object, Value value, AK::Function<IterationDecision(Value)> callback)
{
auto& vm = global_object.vm();
auto iterator = get_iterator(global_object, value);
if (!iterator)
return;
while (true) {
auto next_object = iterator_next(*iterator);
if (!next_object)
return;
auto done_property = next_object->get(vm.names.done);
if (vm.exception())
return;
if (!done_property.is_empty() && done_property.to_boolean())
return;
auto next_value = next_object->get(vm.names.value);
if (vm.exception())
return;
auto result = callback(next_value);
if (result == IterationDecision::Break)
return;
VERIFY(result == IterationDecision::Continue);
}
}
}
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