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Serenity Operating System
1/*
2 * Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@gmx.de>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <AK/Function.h>
28#include <LibJS/AST.h>
29#include <LibJS/Interpreter.h>
30#include <LibJS/Runtime/Error.h>
31#include <LibJS/Runtime/ScriptFunction.h>
32#include <LibJS/Runtime/Value.h>
33
34namespace JS {
35
36ScriptFunction::ScriptFunction(const Statement& body, Vector<FlyString> parameters)
37 : m_body(body)
38 , m_parameters(move(parameters))
39{
40 put("prototype", heap().allocate<Object>());
41 put_native_property("length", length_getter, length_setter);
42}
43
44ScriptFunction::~ScriptFunction()
45{
46}
47
48Value ScriptFunction::call(Interpreter& interpreter)
49{
50 auto& argument_values = interpreter.call_frame().arguments;
51 ArgumentVector arguments;
52 for (size_t i = 0; i < m_parameters.size(); ++i) {
53 auto name = parameters()[i];
54 auto value = js_undefined();
55 if (i < argument_values.size())
56 value = argument_values[i];
57 arguments.append({ move(name), move(value) });
58 }
59 return interpreter.run(m_body, arguments, ScopeType::Function);
60}
61
62Value ScriptFunction::construct(Interpreter& interpreter)
63{
64 return call(interpreter);
65}
66
67Value ScriptFunction::length_getter(Interpreter& interpreter)
68{
69 auto* this_object = interpreter.this_value().to_object(interpreter.heap());
70 if (!this_object)
71 return {};
72 if (!this_object->is_function())
73 return interpreter.throw_exception<Error>("TypeError", "Not a function");
74 return Value(static_cast<i32>(static_cast<const ScriptFunction*>(this_object)->parameters().size()));
75}
76
77void ScriptFunction::length_setter(Interpreter&, Value)
78{
79}
80
81}