pollymc/libutil/include/cmdutils.h

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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>
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#include "libutil_config.h"
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/**
* @file libutil/include/cmdutils.h
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* @brief commandline parsing utilities
*/
namespace Util {
namespace Commandline {
/**
* @brief The FlagStyle enum
* Specifies how flags are decorated
*/
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namespace FlagStyle
{
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enum LIBUTIL_EXPORT Enum
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{
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GNU, /**< --option and -o (GNU Style) */
Unix, /**< -option and -o (Unix Style) */
Windows, /**< /option and /o (Windows Style) */
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#ifdef Q_OS_WIN32
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Default = Windows
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#else
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Default = GNU
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#endif
};
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}
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/**
* @brief The ArgumentStyle enum
*/
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namespace ArgumentStyle
{
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enum LIBUTIL_EXPORT Enum
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{
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Space, /**< --option=value */
Equals, /**< --option value */
SpaceAndEquals, /**< --option[= ]value */
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#ifdef Q_OS_WIN32
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Default = Equals
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#else
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Default = SpaceAndEquals
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#endif
};
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}
namespace OptionType
{
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enum LIBUTIL_EXPORT Enum
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{
Switch,
Option
};
}
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/**
* @brief The ParsingError class
*/
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class LIBUTIL_EXPORT ParsingError : public std::exception
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{
public:
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ParsingError(const QString &what);
ParsingError(const ParsingError &e);
~ParsingError() throw() {}
const char *what() const throw();
QString qwhat() const;
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private:
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QString m_what;
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};
/**
* @brief The Parser class
*/
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class LIBUTIL_EXPORT Parser
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{
public:
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/**
* @brief Parser constructor
* @param flagStyle the FlagStyle to use in this Parser
* @param argStyle the ArgumentStyle to use in this Parser
*/
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Parser(FlagStyle::Enum flagStyle = FlagStyle::Default,
ArgumentStyle::Enum argStyle = ArgumentStyle::Default);
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/**
* @brief set the flag style
* @param style
*/
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void setFlagStyle(FlagStyle::Enum style);
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/**
* @brief get the flag style
* @return
*/
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FlagStyle::Enum flagStyle();
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/**
* @brief set the argument style
* @param style
*/
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void setArgumentStyle(ArgumentStyle::Enum style);
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/**
* @brief get the argument style
* @return
*/
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ArgumentStyle::Enum argumentStyle();
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/**
* @brief define a boolean switch
* @param name the parameter name
* @param def the default value
*/
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void addSwitch(QString name, bool def = false);
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/**
* @brief define an option that takes an additional argument
* @param name the parameter name
* @param def the default value
*/
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void addOption(QString name, QVariant def = QVariant());
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/**
* @brief define a positional argument
* @param name the parameter name
* @param required wether this argument is required
* @param def the default value
*/
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void addArgument(QString name, bool required = true, QVariant def = QVariant());
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/**
* @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
*/
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void addDocumentation(QString name, QString doc, QString metavar = QString());
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/**
* @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
*/
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QString compileHelp(QString progName, int helpIndent = 22, bool flagsInUsage = true);
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/**
* @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
*/
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QString compileUsage(QString progName, bool useFlags = true);
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/**
* @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();
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private:
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FlagStyle::Enum m_flagStyle;
ArgumentStyle::Enum m_argStyle;
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// 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
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OptionType::Enum type;
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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);
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};
}
}
#endif // CMDUTILS_H