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* Copyright (C) 2003 Enrico Zini <enrico@debian.org>
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* This library 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 GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#include "CommandlineParser.h"
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#include <tagcoll/stringf.h>
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using namespace stringf;
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string CommandlineParser::WordWrapper::get(unsigned int width) throw ()
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if (cursor >= s.size())
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// Find the last work break before `width'
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unsigned int brk = cursor;
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for (unsigned int j = cursor; j < s.size() && j < cursor + width; j++)
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} else if (!isspace(s[j]) && (j + 1 == s.size() || isspace(s[j + 1])))
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res = string(s, cursor, string::npos);
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res = string(s, cursor, brk - cursor);
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while (cursor < s.size() && isspace(s[cursor]))
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string CommandlineParser::WordWrapper::get(unsigned int width) throw ()
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while (k > 0 && k + i < s.size() && !isspace(s[i + k]))
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int CommandlineParser::option::intVal() const throw ()
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return atoi(_value.c_str());
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const CommandlineParser::option& CommandlineParser::get(const string& name) const throw ()
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map<string, int>::const_iterator i = byname.find(name);
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if (i == byname.end())
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fprintf(stderr, "Program error: requested info about nonexistant commandline option \"%.*s\".\nAvailable: \n", PFSTR(name));
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for (i = byname.begin(); i != byname.end(); i++)
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fprintf(stderr, " \"%.*s\"\n", PFSTR(i->first));
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assert (i != byname.end());
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const option& o = options[i->second];
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void CommandlineParser::add(const string& name, char shortopt, const string& longopt, const
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string& help, const string& valname, bool val_optional) throw ()
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options.push_back(option(name, shortopt, longopt, help, valname, val_optional));
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shortopts.insert(pair<char, int>(shortopt, options.size() - 1));
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longopts.insert(pair<string, int>(longopt, options.size() - 1));
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byname.insert(pair<string, int>(name, options.size() - 1));
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void CommandlineParser::printHelp() throw ()
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char* columns = getenv("COLUMNS");
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int width = columns ? atoi(columns) : 80;
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unsigned int summax = 0;
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vector<string> summaries;
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// Print the first usage line
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fprintf(stderr, "Usage: %.*s %.*s\n",
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PFSTR(argv0), PFSTR(cmdline_summary));
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// Prepare switch summaries and compute their maximum width
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for (unsigned int i = 0; i < options.size(); i++)
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if (options[i]._shortopt)
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s += string("-") + options[i]._shortopt;
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if (options[i]._longopt.size())
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s += "--" + options[i]._longopt;
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if (options[i]._valname.size())
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string vname = options[i]._val_optional ?
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"[" + options[i]._valname + "]"
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: options[i]._valname;
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if (options[i]._longopt.size())
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if (s.size() > summax)
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summaries.push_back(s);
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for (unsigned int i = 0; i < options.size(); i++)
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WordWrapper ww(options[i]._help);
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string h = ww.get(width - summax - 4);
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fprintf(stderr, " %-*.*s %.*s\n",
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summax, summax, summaries[i].c_str(), PFSTR(h));
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string h = ww.get(width - summax - 4);
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fprintf(stderr, " %-*.*s %.*s\n",
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summax, summax, "", PFSTR(h));
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fprintf(stderr, "%.*s\n", PFSTR(description));
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WordWrapper ww(description);
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string h = ww.get(width);
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fprintf(stderr, "%.*s\n", PFSTR(h));
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bool CommandlineParser::parseLongOption(const string& name, const string& value)
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map<string, int>::iterator o = longopts.find(name);
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if (o == longopts.end())
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fprintf(stderr, "Unknown option name: %.*s\n", PFSTR(name));
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options[o->second]._defined = true;
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if (options[o->second]._valname.size())
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options[o->second]._value = value;
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else if (!options[o->second]._val_optional)
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fprintf(stderr, "Option %.*s requires the %.*s argument\n",
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PFSTR(name), PFSTR(options[o->second]._valname));
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bool CommandlineParser::parseShortOption(char opt, const string& value)
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map<char, int>::iterator o = shortopts.find(opt);
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if (o == shortopts.end())
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fprintf(stderr, "Unknown option: `%c'\n", opt);
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options[o->second]._defined = true;
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if (options[o->second]._valname.size())
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options[o->second]._value = value;
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else if (!options[o->second]._val_optional)
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fprintf(stderr, "Option `%c' requires the %.*s argument\n",
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opt, PFSTR(options[o->second]._valname));
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bool CommandlineParser::parse(int& argc, const char**& argv) throw ()
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bool parses_opts = true;
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for (int i = 1; i < argc; i++)
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if (parses_opts && argv[i][0] == '-' && argv[i][1] != 0)
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if (argv[i][1] == '-')
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// -- option terminator
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string optName = string(argv[i], 2, string::npos);
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unsigned int eqsign = optName.find('=');
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if (eqsign == string::npos)
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if (!parseLongOption(optName))
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if (!parseLongOption(optName.substr(0, eqsign),
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optName.substr(eqsign + 1)))
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// Unpacked short option, might have an argument
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char opt = argv[i][1];
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map<char, int>::iterator o = shortopts.find(opt);
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if (o == shortopts.end())
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fprintf(stderr, "Unknown option: `%c'\n", opt);
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if (options[o->second]._valname.size())
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if (argv[i + 1] && argv[i + 1][0] != '-')
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// Is followed by an argument
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if (!parseShortOption(opt, argv[i]))
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// Is not followed by an argument
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if (!parseShortOption(opt))
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// Does not accept arguments
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if (!parseShortOption(opt))
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// Packed short options
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for (const char* s = argv[i] + 1; *s; s++)
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if (!parseShortOption(*s))
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// Not a switch: keep it in the new argv
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argv[nargc] = argv[i];
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// vim:set ts=4 sw=4:
added
removed
tools/CommandlineParser.cc
