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/*************************************************************************
** CLOption.hpp **
** **
** 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/>. **
*************************************************************************/
#ifndef CL_OPTION_HPP
#define CL_OPTION_HPP
#include <iomanip>
#include <sstream>
#include <string>
namespace CL {
class Option
{
friend class CommandLine;
public:
enum class ArgMode {NONE, OPTIONAL, REQUIRED};
public:
Option (const char *longname, char shortname, const char *summary)
: _shortName(shortname), _longName(longname), _summary(summary), _given(false) {}
virtual ~Option () = default;
virtual std::string typeString () const {return "";}
virtual ArgMode argMode () const {return ArgMode::NONE;}
virtual bool given () const {return _given;}
virtual char shortName () const {return _shortName;}
virtual std::string longName () const {return _longName;}
virtual std::string summary () const {return _summary;}
virtual std::string argName () const {return "";}
virtual std::string valueString () const {return "";}
virtual std::string helpline () const {
std::string line;
if (_shortName != '\0')
line = std::string("-") + _shortName + ", ";
else
line = " ";
line += "--" + std::string(_longName);
if (!argName().empty()) {
if (argMode() == ArgMode::OPTIONAL)
line += '[';
line += '=';
line += argName();
if (argMode() == ArgMode::OPTIONAL)
line += ']';
}
if (_summary) {
line += '\t';
line += _summary;
}
if (argMode() != ArgMode::NONE && !valueString().empty())
line += std::string(" [") + valueString() + "]";
return line;
}
protected:
virtual bool parse (std::istream &is, bool longopt) {
if (is.eof())
return given(argMode() != ArgMode::REQUIRED);
if (argMode() == ArgMode::OPTIONAL && is.peek() == ' ')
return given(false);
if (longopt && is.get() != '=')
return given(false);
return given(parseValue(is));
}
virtual bool parseValue (std::istream &is) {
return is.peek() == EOF || argMode() == ArgMode::NONE;
}
bool given (bool val) {return _given = val;}
private:
char _shortName;
const char *_longName;
const char*_summary;
bool _given;
};
template <typename T>
constexpr const char* typeString () {return "unknown";}
template<> constexpr const char* typeString<bool> () {return "boolean";}
template<> constexpr const char* typeString<int> () {return "integer";}
template<> constexpr const char* typeString<unsigned> () {return "non-negative integer";}
template<> constexpr const char* typeString<double> () {return "floating point";}
template<> constexpr const char* typeString<std::string> () {return "string";}
template <typename T>
inline T parseValue (std::istream &is) {
T value;
is >> value;
return value;
}
template<>
inline std::string parseValue (std::istream &is) {
is >> std::ws;
std::string str;
std::getline(is, str);
return str;
}
template <typename T, Option::ArgMode mode>
class TypedOption : public Option
{
public:
TypedOption (const char *longName, char shortName, const char *argName, T val, const char *summary)
: Option(longName, shortName, summary), _argName(argName), _value(val) {}
TypedOption (const char *longName, char shortName, const char *argName, const char *summary)
: Option(longName, shortName, summary), _argName(argName), _value() {}
T value () const {return _value;}
std::string typeString () const override {return CL::typeString<T>();}
std::string argName() const override {return _argName ? _argName : "";}
std::string valueString () const override {
std::ostringstream oss;
oss << _value;
return oss.str();
}
ArgMode argMode () const override {return mode;}
protected:
bool parseValue (std::istream &is) override {
T value = CL::parseValue<T>(is);
if (!is.fail())
_value = std::move(value);
return !is.fail() || (argMode() == ArgMode::OPTIONAL && is.eof());
}
private:
const char *_argName;
T _value;
};
template <Option::ArgMode mode>
class TypedOption<bool, mode> : public Option
{
public:
TypedOption (const char *longName, char shortName, const char *argName, bool val, const char *summary)
: Option(longName, shortName, summary), _argName(argName), _value(val) {}
TypedOption (const char *longName, char shortName, const char *argName, const char *summary)
: Option(longName, shortName, summary), _argName(argName), _value(false) {}
bool value () const {return _value;}
std::string valueString () const override {return _value ? "yes" : "no";}
ArgMode argMode () const override {return mode;}
std::string typeString () const override {return CL::typeString<bool>();}
std::string argName() const override {return _argName ? _argName : "";}
protected:
bool parseValue (std::istream &is) override {
std::string str;
is >> str;
if (is.fail())
return argMode() != ArgMode::REQUIRED;
if (str == "yes" || str == "y" || str == "true" || str == "1")
_value = true;
else if (str == "no" || str == "n" || str == "false" || str == "0")
_value = false;
else
return false;
return true;
}
private:
const char *_argName;
bool _value;
};
} // namespace CL
#endif
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