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https://github.com/SerenityOS/serenity
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ed90d39cd7
Previously the shell parser would discard empty tokens. We now allow them when they are enclosed in quotes (either '' or "") This means that a command like _echo ""_ will actually pass an empty string to /bin/echo in argv[1] now.
94 lines
2.6 KiB
C++
94 lines
2.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/String.h>
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#include <AK/Vector.h>
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struct Redirection {
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enum Type {
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Pipe,
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FileWrite,
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FileWriteAppend,
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FileRead,
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};
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Type type;
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int fd { -1 };
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int rewire_fd { -1 };
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String path {};
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};
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struct Rewiring {
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int fd { -1 };
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int rewire_fd { -1 };
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};
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struct Subcommand {
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Vector<String> args;
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Vector<Redirection> redirections;
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Vector<Rewiring> rewirings;
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};
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struct Command {
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Vector<Subcommand> subcommands;
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};
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class Parser {
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public:
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explicit Parser(const String& input)
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: m_input(input)
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{
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}
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Vector<Command> parse();
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private:
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enum class AllowEmptyToken { No, Yes };
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void commit_token(AllowEmptyToken = AllowEmptyToken::No);
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void commit_subcommand();
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void commit_command();
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void do_pipe();
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void begin_redirect_read(int fd);
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void begin_redirect_write(int fd);
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enum State {
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Free,
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InSingleQuotes,
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InDoubleQuotes,
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InWriteAppendOrRedirectionPath,
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InRedirectionPath,
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};
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State m_state { Free };
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String m_input;
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Vector<Command> m_commands;
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Vector<Subcommand> m_subcommands;
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Vector<String> m_tokens;
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Vector<Redirection> m_redirections;
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Vector<char> m_token;
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};
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