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/* Copyright 2013 MultiMC Contributors
*
* Authors: Orochimarufan <orochimarufan.x3@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef CMDUTILS_H
#define CMDUTILS_H
#include <exception>
#include <QString>
#include <QVariant>
#include <QHash>
#include <QStringList>
/**
* @file utils/cmdutils.h
* @brief commandline parsing utilities
*/
namespace Util {
namespace Commandline {
/**
* @brief The FlagStyle enum
* Specifies how flags are decorated
*/
enum class FlagStyle {
GNU, /**< --option and -o (GNU Style) */
Unix, /**< -option and -o (Unix Style) */
Windows, /**< /option and /o (Windows Style) */
#ifdef Q_OS_WIN32
Default = Windows
#else
Default = GNU
#endif
};
/**
* @brief The ArgumentStyle enum
*/
enum class ArgumentStyle {
Space, /**< --option=value */
Equals, /**< --option value */
SpaceAndEquals, /**< --option[= ]value */
#ifdef Q_OS_WIN32
Default = Equals
#else
Default = SpaceAndEquals
#endif
};
/**
* @brief The ParsingError class
*/
class ParsingError : public std::exception
{
public:
ParsingError(const QString &what) throw();
ParsingError(const ParsingError &e) throw();
~ParsingError() throw() {}
char *what() const throw();
QString qwhat() const throw();
private:
QString m_what;
};
/**
* @brief The Parser class
*/
class Parser
{
public:
/**
* @brief Parser constructor
* @param flagStyle the FlagStyle to use in this Parser
* @param argStyle the ArgumentStyle to use in this Parser
*/
Parser(FlagStyle flagStyle=FlagStyle::Default, ArgumentStyle argStyle=ArgumentStyle::Default);
/**
* @brief set the flag style
* @param style
*/
void setFlagStyle(FlagStyle style);
/**
* @brief get the flag style
* @return
*/
FlagStyle flagStyle();
/**
* @brief set the argument style
* @param style
*/
void setArgumentStyle(ArgumentStyle style);
/**
* @brief get the argument style
* @return
*/
ArgumentStyle argumentStyle();
/**
* @brief define a boolean switch
* @param name the parameter name
* @param def the default value
*/
void addSwitch(QString name, bool def=false) throw (const char *);
/**
* @brief define an option that takes an additional argument
* @param name the parameter name
* @param def the default value
*/
void addOption(QString name, QVariant def=QVariant()) throw (const char *);
/**
* @brief define a positional argument
* @param name the parameter name
* @param required wether this argument is required
* @param def the default value
*/
void addArgument(QString name, bool required=true, QVariant def=QVariant()) throw (const char *);
/**
* @brief adds a flag to an existing parameter
* @param name the (existing) parameter name
* @param flag the flag character
* @see addSwitch addArgument addOption
* Note: any one parameter can only have one flag
*/
void addShortOpt(QString name, QChar flag) throw (const char *);
/**
* @brief adds documentation to a Parameter
* @param name the parameter name
* @param metavar a string to be displayed as placeholder for the value
* @param doc a QString containing the documentation
*/
void addDocumentation(QString name, QString doc, QString metavar=QString()) throw (const char *);
/**
* @brief generate a help message
* @param progName the program name to use in the help message
* @param helpIndent how much the parameter documentation should be indented
* @param flagsInUsage whether we should use flags instead of options in the usage
* @return a help message
*/
QString compileHelp(QString progName, int helpIndent=22, bool flagsInUsage=true);
/**
* @brief generate a short usage message
* @param progName the program name to use in the usage message
* @param useFlags whether we should use flags instead of options
* @return a usage message
*/
QString compileUsage(QString progName, bool useFlags=true);
/**
* @brief parse
* @param argv a QStringList containing the program ARGV
* @return a QHash mapping argument names to their values
*/
QHash<QString, QVariant> parse(QStringList argv) throw (ParsingError);
/**
* @brief clear all definitions
*/
void clear();
~Parser();
private:
FlagStyle m_flagStyle;
ArgumentStyle m_argStyle;
enum class OptionType {
Switch,
Option
};
// Important: the common part MUST BE COMMON ON ALL THREE structs
struct CommonDef {
QString name;
QString doc;
QString metavar;
QVariant def;
};
struct OptionDef {
// common
QString name;
QString doc;
QString metavar;
QVariant def;
// option
OptionType type;
QChar flag;
};
struct PositionalDef {
// common
QString name;
QString doc;
QString metavar;
QVariant def;
// positional
bool required;
};
QHash<QString, OptionDef *> m_options;
QHash<QChar, OptionDef *> m_flags;
QHash<QString, CommonDef *> m_params;
QList<PositionalDef *> m_positionals;
QList<OptionDef *> m_optionList;
void getPrefix(QString &opt, QString &flag);
};
}
}
#endif // CMDUTILS_H
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