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134 lines
3.0 KiB
C++
134 lines
3.0 KiB
C++
/*
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* Copyright 2003-2017 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_CUE_PARSER_HXX
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#define MPD_CUE_PARSER_HXX
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#include "check.h"
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#include "DetachedSong.hxx"
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#include "tag/Builder.hxx"
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#include "Compiler.h"
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#include <string>
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#include <memory>
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class CueParser {
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enum {
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/**
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* Parsing the CUE header.
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*/
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HEADER,
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/**
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* Parsing a "FILE ... WAVE".
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*/
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WAVE,
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/**
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* Ignore everything until the next "FILE".
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*/
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IGNORE_FILE,
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/**
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* Parsing a "TRACK ... AUDIO".
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*/
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TRACK,
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/**
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* Ignore everything until the next "TRACK".
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*/
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IGNORE_TRACK,
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} state = HEADER;
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/**
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* Tags read from the CUE header.
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*/
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TagBuilder header_tag;
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/**
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* Tags read for the current song (attribute #current). When
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* #current gets moved to #previous, TagBuilder::Commit() will
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* be called.
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*/
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TagBuilder song_tag;
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std::string filename;
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/**
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* The song currently being edited.
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*/
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std::unique_ptr<DetachedSong> current;
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/**
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* The previous song. It is remembered because its end_time
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* will be set to the current song's start time.
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*/
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std::unique_ptr<DetachedSong> previous;
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/**
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* A song that is completely finished and can be returned to
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* the caller via Get().
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*/
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std::unique_ptr<DetachedSong> finished;
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/**
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* Tracks whether Finish() has been called. If true, then all
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* remaining (partial) results will be delivered by Get().
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*/
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bool end = false;
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public:
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/**
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* Feed a text line from the CUE file into the parser. Call
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* Get() after this to see if a song has been finished.
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*/
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void Feed(const char *line) noexcept;
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/**
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* Tell the parser that the end of the file has been reached. Call
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* Get() after this to see if a song has been finished.
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* This procedure must be done twice!
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*/
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void Finish() noexcept;
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/**
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* Check if a song was finished by the last Feed() or Finish()
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* call.
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*
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* @return a song object that must be freed by the caller, or NULL if
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* no song was finished at this time
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*/
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std::unique_ptr<DetachedSong> Get() noexcept;
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private:
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gcc_pure
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TagBuilder *GetCurrentTag() noexcept;
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/**
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* Commit the current song. It will be moved to "previous",
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* so the next song may soon edit its end time (using the next
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* song's start time).
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*/
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void Commit() noexcept;
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void Feed2(char *p) noexcept;
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};
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#endif
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