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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 <stdexcept>
#include <QString>
#include <QVariant>
#include <QHash>
#include <QStringList>
#include "libutil_config.h"
/**
* @file libutil/include/cmdutils.h
* @brief commandline parsing and processing utilities
*/
namespace Util {
namespace Commandline {
/**
* @brief split a string into argv items like a shell would do
* @param args the argument string
* @return a QStringList containing all arguments
*/
LIBUTIL_EXPORT QStringList splitArgs(QString args);
/**
* @brief The FlagStyle enum
* Specifies how flags are decorated
*/
namespace FlagStyle
{
enum Enum
{
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
*/
namespace ArgumentStyle
{
enum Enum
{
Space, /**< --option=value */
Equals, /**< --option value */
SpaceAndEquals, /**< --option[= ]value */
#ifdef Q_OS_WIN32
Default = Equals
#else
Default = SpaceAndEquals
#endif
};
}
/**
* @brief The ParsingError class
*/
class LIBUTIL_EXPORT ParsingError : public std::runtime_error
{
public:
ParsingError(const QString &what);
};
/**
* @brief The Parser class
*/
class LIBUTIL_EXPORT 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::Enum flagStyle = FlagStyle::Default,
ArgumentStyle::Enum argStyle = ArgumentStyle::Default);
/**
* @brief set the flag style
* @param style
*/
void setFlagStyle(FlagStyle::Enum style);
/**
* @brief get the flag style
* @return
*/
FlagStyle::Enum flagStyle();
/**
* @brief set the argument style
* @param style
*/
void setArgumentStyle(ArgumentStyle::Enum style);
/**
* @brief get the argument style
* @return
*/
ArgumentStyle::Enum argumentStyle();
/**
* @brief define a boolean switch
* @param name the parameter name
* @param def the default value
*/
void addSwitch(QString name, bool def = false);
/**
* @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());
/**
* @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());
/**
* @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);
/**
* @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
* Note: on positional arguments, metavar replaces the name as displayed.
* on options , metavar replaces the value placeholder
*/
void addDocumentation(QString name, QString doc, QString metavar = QString());
/**
* @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);
/**
* @brief clear all definitions
*/
void clear();
~Parser();
private:
FlagStyle::Enum m_flagStyle;
ArgumentStyle::Enum m_argStyle;
enum OptionType
{
otSwitch,
otOption
};
// 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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