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/*
* Copyright (c) 2018-2020, 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.
*/
#pragma once
#include <AK/String.h>
#include <AK/Vector.h>
struct Token {
enum Type {
Bare,
SingleQuoted,
DoubleQuoted,
UnterminatedSingleQuoted,
UnterminatedDoubleQuoted,
Comment,
Special,
};
String text;
size_t end;
size_t length;
Type type;
};
enum Attributes {
None = 0x0,
ShortCircuitOnFailure = 0x1,
InBackground = 0x2,
};
struct Redirection {
enum Type {
Pipe,
FileWrite,
FileWriteAppend,
FileRead,
};
Type type;
int fd { -1 };
int rewire_fd { -1 };
size_t redirection_op_start { 0 };
Token path {};
};
struct Rewiring {
int fd { -1 };
int rewire_fd { -1 };
};
struct Subcommand {
Vector<Token> args;
Vector<Redirection> redirections;
Vector<Rewiring> rewirings;
};
struct Command {
Vector<Subcommand> subcommands;
Attributes attributes;
};
class Parser {
public:
explicit Parser(const String& input)
: m_input(input)
{
}
Vector<Command> parse();
private:
enum class AllowEmptyToken {
No,
Yes,
};
void commit_token(Token::Type, AllowEmptyToken = AllowEmptyToken::No);
void commit_subcommand();
void commit_command(Attributes = None);
void do_pipe();
void begin_redirect_read(int fd);
void begin_redirect_write(int fd);
enum State {
Free,
InSingleQuotes,
InDoubleQuotes,
InWriteAppendOrRedirectionPath,
InRedirectionPath,
};
State state() const { return m_state_stack.last(); }
void pop_state()
{
m_state_stack.take_last();
}
void push_state(State state)
{
m_state_stack.append(state);
}
bool in_state(State) const;
Vector<State> m_state_stack { Free };
String m_input;
Vector<Command> m_commands;
Vector<Subcommand> m_subcommands;
Vector<Token> m_tokens;
Vector<Redirection> m_redirections;
Vector<char> m_token;
size_t m_position { 0 };
};
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