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/*
* Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@gmx.de>
* 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 <AK/Function.h>
#include <LibJS/AST.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/ScriptFunction.h>
#include <LibJS/Runtime/Value.h>
namespace JS {
ScriptFunction::ScriptFunction(const FlyString& name, const Statement& body, Vector<FlyString> parameters, LexicalEnvironment* parent_environment)
: m_name(name)
, m_body(body)
, m_parameters(move(parameters))
, m_parent_environment(parent_environment)
{
HashMap<FlyString, Variable> variables;
for (auto& parameter : parameters) {
variables.set(parameter, {});
}
put("prototype", heap().allocate<Object>());
put_native_property("length", length_getter, length_setter);
}
ScriptFunction::~ScriptFunction()
{
}
void ScriptFunction::visit_children(Visitor& visitor)
{
Function::visit_children(visitor);
visitor.visit(m_parent_environment);
}
LexicalEnvironment* ScriptFunction::create_environment()
{
HashMap<FlyString, Variable> variables;
for (auto& parameter : m_parameters) {
variables.set(parameter, { js_undefined(), DeclarationKind::Var });
}
if (body().is_scope_node()) {
for (auto& declaration : static_cast<const ScopeNode&>(body()).variables()) {
for (auto& declarator : declaration.declarations()) {
variables.set(declarator.id().string(), { js_undefined(), DeclarationKind::Var });
}
}
}
if (variables.is_empty())
return m_parent_environment;
return heap().allocate<LexicalEnvironment>(move(variables), m_parent_environment);
}
Value ScriptFunction::call(Interpreter& interpreter)
{
auto& argument_values = interpreter.call_frame().arguments;
ArgumentVector arguments;
for (size_t i = 0; i < m_parameters.size(); ++i) {
auto name = parameters()[i];
auto value = js_undefined();
if (i < argument_values.size())
value = argument_values[i];
arguments.append({ name, value });
interpreter.current_environment()->set(name, { value, DeclarationKind::Var });
}
return interpreter.run(m_body, arguments, ScopeType::Function);
}
Value ScriptFunction::construct(Interpreter& interpreter)
{
return call(interpreter);
}
Value ScriptFunction::length_getter(Interpreter& interpreter)
{
auto* this_object = interpreter.this_value().to_object(interpreter.heap());
if (!this_object)
return {};
if (!this_object->is_function())
return interpreter.throw_exception<TypeError>("Not a function");
return Value(static_cast<i32>(static_cast<const ScriptFunction*>(this_object)->parameters().size()));
}
void ScriptFunction::length_setter(Interpreter&, Value)
{
}
}
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