ladybird/Userland/js.cpp

/*
 * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
 * 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/ByteBuffer.h>
#include <AK/NonnullOwnPtr.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <LibJS/AST.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Parser.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/PrimitiveString.h>
#include <LibJS/Runtime/Value.h>
#include <stdio.h>

#define PROGRAM 6

int main(int argc, char** argv)
{
    bool dump_ast = false;
    bool gc_on_every_allocation = false;
    bool print_last_result = false;
    const char* script_path = nullptr;

    Core::ArgsParser args_parser;
    args_parser.add_option(dump_ast, "Dump the AST", "ast-dump", 'A');
    args_parser.add_option(dump_ast, "Print last result", "print-last-result", 'l');
    args_parser.add_option(gc_on_every_allocation, "GC on every allocation", "gc-on-every-allocation", 'g');
    args_parser.add_positional_argument(script_path, "Path to script file", "script");
    args_parser.parse(argc, argv);

    auto file = Core::File::construct(script_path);
    if (!file->open(Core::IODevice::ReadOnly)) {
        fprintf(stderr, "Failed to open %s: %s\n", script_path, file->error_string());
        return 1;
    }
    auto file_contents = file->read_all();

    StringView source;
    if (file_contents.size() >= 2 && file_contents[0] == '#' && file_contents[1] == '!') {
        size_t i = 0;
        for (i = 2; i < file_contents.size(); ++i) {
            if (file_contents[i] == '\n')
                break;
        }
        source = StringView((const char*)file_contents.data() + i, file_contents.size() - i);
    } else {
        source = file_contents;
    }

    JS::Interpreter interpreter;
    interpreter.heap().set_should_collect_on_every_allocation(gc_on_every_allocation);

    auto program = JS::Parser(JS::Lexer(source)).parse_program();

    if (dump_ast)
        program->dump(0);

    auto result = interpreter.run(*program);
    dbg() << "Interpreter returned " << result;

    if (print_last_result)
        printf("%s\n", result.to_string().characters());

    return 0;
}