From db238cc23f3bb5c9768d30ae24b99e67a5795203 Mon Sep 17 00:00:00 2001 From: Denis Krjuchkov Date: Sun, 24 Nov 2013 17:19:51 +0600 Subject: CommandLine: new command line parser This implementation behaves mostly identical to old parser. Few observable differences: - There are no option groups (single group is used for all options) - Option --stdout is hidden (it has been obsolete for a long time) - MPD executable name (mpd) is hardcoded for simplicity --- src/util/OptionDef.hxx | 63 +++++++++++++++++++++++++++++++++ src/util/OptionParser.cxx | 59 +++++++++++++++++++++++++++++++ src/util/OptionParser.hxx | 88 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 210 insertions(+) create mode 100644 src/util/OptionDef.hxx create mode 100644 src/util/OptionParser.cxx create mode 100644 src/util/OptionParser.hxx (limited to 'src/util') diff --git a/src/util/OptionDef.hxx b/src/util/OptionDef.hxx new file mode 100644 index 000000000..ca9e6083f --- /dev/null +++ b/src/util/OptionDef.hxx @@ -0,0 +1,63 @@ +/* + * Copyright (C) 2003-2013 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifndef MPD_UTIL_OPTIONDEF_HXX +#define MPD_UTIL_OPTIONDEF_HXX + +/** + * Command line option definition. + */ +class OptionDef +{ + const char *long_option; + char short_option; + const char *desc; +public: + constexpr OptionDef(const char *_long_option, const char *_desc) + : long_option(_long_option), + short_option(0), + desc(_desc) { } + + constexpr OptionDef(const char *_long_option, + char _short_option, const char *_desc) + : long_option(_long_option), + short_option(_short_option), + desc(_desc) { } + + bool HasLongOption() const { return long_option != nullptr; } + bool HasShortOption() const { return short_option != 0; } + bool HasDescription() const { return desc != nullptr; } + + const char *GetLongOption() const { + assert(HasLongOption()); + return long_option; + } + + char GetShortOption() const { + assert(HasShortOption()); + return short_option; + } + + const char *GetDescription() const { + assert(HasDescription()); + return desc; + } +}; + +#endif diff --git a/src/util/OptionParser.cxx b/src/util/OptionParser.cxx new file mode 100644 index 000000000..b8addb9a2 --- /dev/null +++ b/src/util/OptionParser.cxx @@ -0,0 +1,59 @@ +/* + * Copyright (C) 2003-2013 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "OptionParser.hxx" +#include "OptionDef.hxx" + +#include + +bool OptionParser::CheckOption(const OptionDef &opt) +{ + assert(option != nullptr); + + if (is_long) + return opt.HasLongOption() && + strcmp(option, opt.GetLongOption()) == 0; + + return opt.HasShortOption() && + option[0] == opt.GetShortOption() && + option[1] == '\0'; +} + +bool OptionParser::ParseNext() +{ + assert(HasEntries()); + char *arg = *argv; + ++argv; + --argc; + if (arg[0] == '-') { + if (arg[1] == '-') { + option = arg + 2; + is_long = true; + } + else { + option = arg + 1; + is_long = false; + } + option_raw = arg; + return true; + } + option = nullptr; + option_raw = nullptr; + return false; +} diff --git a/src/util/OptionParser.hxx b/src/util/OptionParser.hxx new file mode 100644 index 000000000..74091bc29 --- /dev/null +++ b/src/util/OptionParser.hxx @@ -0,0 +1,88 @@ +/* + * Copyright (C) 2003-2013 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifndef MPD_UTIL_OPTIONPARSER_HXX +#define MPD_UTIL_OPTIONPARSER_HXX + +#include + +class OptionDef; + +/** + * Command line option parser. + */ +class OptionParser +{ + int argc; + char **argv; + char *option; + char *option_raw; + bool is_long; +public: + /** + * Constructs #OptionParser. + */ + OptionParser(int _argc, char **_argv) + : argc(_argc - 1), argv(_argv + 1), + option(nullptr), option_raw(nullptr), is_long(false) { } + + /** + * Checks if there are command line entries to process. + */ + bool HasEntries() const { return argc > 0; } + + /** + * Gets the last parsed option. + */ + char *GetOption() { + assert(option_raw != nullptr); + return option_raw; + } + + /** + * Checks if current option is a specified option. + */ + bool CheckOption(const OptionDef& opt); + + /** + * Checks if current option is a specified option + * or specified alternative option. + */ + bool CheckOption(const OptionDef& opt, const OptionDef &alt_opt) { + return CheckOption(opt) || CheckOption(alt_opt); + } + + /** + * Parses current command line entry. + * Returns true on success, false otherwise. + * Regardless of result, advances current position to the next + * command line entry. + */ + bool ParseNext(); + + /** + * Checks if specified string is a command line option. + */ + static bool IsOption(const char *s) { + assert(s != nullptr); + return s[0] == '-'; + } +}; + +#endif -- cgit v1.2.3