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/*************************************************************************
** CLCommandLine.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2017 Martin Gieseking <martin.gieseking@uos.de> **
** **
** 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 3 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, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#include <algorithm>
#include <cstring>
#include <map>
#include "CLCommandLine.hpp"
#include "version.hpp"
using namespace CL;
using namespace std;
CommandLine::CommandLine (const char *summary, const char *usage, const char *copyright)
: _summary(summary), _usage(usage), _copyright(copyright)
{
}
void CommandLine::parse (int argc, char **argv) {
bool filesOnly = false;
for (int i=1; i < argc; i++) {
istringstream iss(argv[i]);
if (filesOnly || iss.peek() != '-')
_files.push_back(argv[i]);
else {
iss.get(); // skip dash
if (iss.peek() != '-')
parseShortOption(iss, argc, argv, i);
else {
iss.get(); // skip dash
if (iss.peek() == EOF) // "--" only, no following option name?
filesOnly = true; // treat all following options as filenames
else
parseLongOption(iss);
}
}
}
}
static void error (const Option &option, bool shortname, const string &msg) {
ostringstream oss;
oss << "option ";
if (shortname)
oss << '-' << option.shortName();
else
oss << "--" << option.longName();
oss << ": " << msg;
throw CommandLineException(oss.str());
}
static void type_error (const Option &option, bool shortname) {
ostringstream oss;
switch (option.argMode()) {
case Option::ArgMode::NONE:
error(option, shortname, "no argument expected");
break;
case Option::ArgMode::OPTIONAL:
oss << "optional argument ";
if (!option.argName().empty())
oss << "'" << option.argName() << "' ";
oss << "must be of "+option.typeString()+" type";
error(option, shortname, oss.str());
break;
default:
oss << option.typeString()+" argument ";
if (!option.argName().empty())
oss << "'" << option.argName() << "' ";
oss << "expected";
error(option, shortname, oss.str());
}
}
void CommandLine::parseShortOption (istringstream &iss, int argc, char **argv, int &argn) {
bool combined = false;
do {
char shortname = static_cast<char>(iss.get());
if (!isalnum(shortname))
throw CommandLineException(string("syntax error: -")+shortname);
if (Option *option = lookupOption(shortname)) {
if (!combined || option->argMode() == Option::ArgMode::NONE) {
if (option->argMode() == Option::ArgMode::REQUIRED && strlen(argv[argn]) == 2) { // required argument separated by whitespace?
if (argn+1 < argc && argv[argn+1][0] != '-') {
iss.clear(); // reset error flags
iss.str(argv[++argn]); // continue parsing with next command-line field
}
}
if (!option->parse(iss, false))
type_error(*option, true);
if (option->argMode() == Option::ArgMode::NONE)
combined = true;
}
else
throw CommandLineException(string("option -")+ shortname + " must be given separately");
}
else
throw CommandLineException(string("unknown option -")+shortname);
}
while (combined && !iss.eof());
}
void CommandLine::parseLongOption (istream &is) {
string optname;
while (isalnum(is.peek()) || (!optname.empty() && is.peek() == '-'))
optname += char(is.get());
if (optname.empty())
throw CommandLineException("unexpected character '" + string(1, is.peek()) + "' after '--'");
vector<Option*> options = lookupOption(optname);
if (options.empty())
throw CommandLineException("unknown option --"+optname);
else if (options.size() == 1) {
if (!options[0]->parse(is, true))
type_error(*options[0], false);
}
else { // is partially given option ambiguous?
sort(options.begin(), options.end(), [](const Option *opt1, const Option *opt2) {
return opt1->longName() < opt2->longName();
});
string msg = "option --" + optname + " is ambiguous (";
for (const Option *opt : options) {
if (opt != options[0])
msg += ", ";
msg += opt->longName();
}
msg += ')';
throw CommandLineException(msg);
}
}
/** Returns all options that match the given long name. */
vector<Option*> CommandLine::lookupOption (const string &optname) const {
vector<Option*> matches;
int len = optname.length();
for (OptSectPair optsect : options()) {
if (optsect.first->longName() == optname) { // exact match?
matches.clear();
matches.push_back(optsect.first);
break;
}
if (optsect.first->longName().substr(0, len) == optname) // partial match?
matches.push_back(optsect.first);
}
return matches;
}
/** Returns the option that match the given short name. */
Option* CommandLine::lookupOption (char optchar) const {
auto it = find_if(options().begin(), options().end(), [=](const OptSectPair &optsect) {
return optsect.first->shortName() == optchar;
});
return (it != options().end()) ? it->first : nullptr;
}
/** Prints help text including summary of options.
* @param[in] os output stream the help text is printed to
* @param[in] mode output mode (0=section, 1=sorted by short options, 2=sorted by long options) */
void CommandLine::help (ostream &os, int mode) const {
os << PROGRAM_NAME << ' '<< PROGRAM_VERSION << "\n\n";
os << _summary << "\n\n";
// print usage info
size_t start=0, pos=0;
string usage = _usage;
while ((pos = usage.find('\n', start)) != string::npos || start < usage.length()) {
os << (start == 0 ? "Usage: " : " ") << PROGRAM_NAME << ' ' << usage.substr(start, pos) << '\n';
start = (pos != string::npos ? pos+1 : string::npos);
}
if (mode > 0)
os << '\n';
// compute width of first column of help output
map<Option*, pair<string,string>> linecols;
size_t col1width=0;
for (const OptSectPair &ospair : options()) {
string line = ospair.first->helpline();
if ((pos = line.find('\t')) != string::npos) {
linecols.emplace(ospair.first, pair<string,string>(line.substr(0, pos), line.substr(pos+1)));
col1width = max(col1width, pos);
}
}
if (mode > 0) {
bool (*isless)(const OptSectPair&, const OptSectPair&) = [](const OptSectPair &p1, const OptSectPair &p2) {
return p1.first->longName() < p2.first->longName();
};
if (mode == 1) {
isless = [](const OptSectPair &p1, const OptSectPair &p2) {
char c1 = p1.first->shortName(), c2 = p2.first->shortName();
if (c1 == c2)
return p1.first->longName() < p2.first->longName();
if (tolower(c1) == tolower(c2))
return c1 > c2; // lower case before upper case letters
return tolower(c1) < tolower(c2);
};
}
sort(options().begin(), options().end(), isless);
}
// print summary of options
col1width += 2;
int sectno=-1;
for (const OptSectPair &ospair : options()) {
if (mode == 0 && ospair.second != sectno) { // first option in current section?
sectno = ospair.second;
if (section(sectno))
os << '\n' << section(sectno) << ":\n";
}
Option *opt = ospair.first;
os << " " << setw(col1width) << left << linecols[opt].first;
os << setw(0) << linecols[opt].second << '\n';
}
os << '\n' << _copyright << '\n';
}
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