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Serenity Operating System
1/*
2 * Copyright (c) 2020, Linus Groh <mail@linusgroh.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/StringBuilder.h>
28#include <LibJS/AST.h>
29#include <LibJS/Interpreter.h>
30#include <LibJS/Parser.h>
31#include <LibJS/Runtime/Error.h>
32#include <LibJS/Runtime/FunctionConstructor.h>
33#include <LibJS/Runtime/ScriptFunction.h>
34
35namespace JS {
36
37FunctionConstructor::FunctionConstructor()
38{
39 put("prototype", interpreter().function_prototype());
40 put("length", Value(1));
41}
42
43FunctionConstructor::~FunctionConstructor()
44{
45}
46
47Value FunctionConstructor::call(Interpreter& interpreter)
48{
49 return construct(interpreter);
50}
51
52Value FunctionConstructor::construct(Interpreter& interpreter)
53{
54 String parameters_source = "";
55 String body_source = "";
56 if (interpreter.argument_count() == 1)
57 body_source = interpreter.argument(0).to_string();
58 if (interpreter.argument_count() > 1) {
59 Vector<String> parameters;
60 for (size_t i = 0; i < interpreter.argument_count() - 1; ++i)
61 parameters.append(interpreter.argument(i).to_string());
62 StringBuilder parameters_builder;
63 parameters_builder.join(',', parameters);
64 parameters_source = parameters_builder.build();
65 body_source = interpreter.argument(interpreter.argument_count() - 1).to_string();
66 }
67 auto source = String::format("function (%s) { %s }", parameters_source.characters(), body_source.characters());
68 auto parser = Parser(Lexer(source));
69 auto function_expression = parser.parse_function_node<FunctionExpression>();
70 if (parser.has_errors()) {
71 // FIXME: The parser should expose parsing error strings rather than just fprintf()'ing them
72 return interpreter.heap().allocate<Error>("SyntaxError", "");
73 }
74 return function_expression->execute(interpreter);
75}
76
77}