The complete source code of IdealIRC http://www.idealirc.org/
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idealirc/ICommand/ICommand.h

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/*
* IdealIRC - Internet Relay Chat client
* Copyright (C) 2021 Tom-Andre Barstad.
* This software is licensed under the Software Attribution License.
* See LICENSE for more information.
*/
#ifndef ICOMMAND_H
#define ICOMMAND_H
#include "ICommand/CommandData.h"
#include <QObject>
#include <memory>
class IRC;
class IWinStatus;
class MdiManager;
struct ICommandPriv;
class ICommand : public QObject
{
Q_OBJECT
friend struct ICommandPriv;
public:
explicit ICommand(IRC& connection_);
~ICommand();
void parse(QString text);
IRC& getConnection();
private:
bool tryParseIRC(QString cmdLine);
bool tryParseInternal(QString cmdLine);
void print_notEnoughParameters(const QString& command);
void print_invalidCommandSwitch(const QString& command);
void print_invalidWindowTypeForCommand(const QString& command);
void print_notConnectedToServer(const QString& command);
/* Predicates for parsing commands */
static std::optional<std::string> prd_AnyWord(int& idx, const QString& line);
static std::optional<std::string> prd_AnyWordToUpper(int& idx, const QString& line);
static std::optional<std::string> prd_OptionalChannel(int& idx, const QString& line);
static std::optional<std::string> prd_NotSwitch(int& idx, const QString& line);
static std::optional<std::string> prd_Switch(int& idx, const QString& line);
static std::optional<std::string> prd_Message(int& idx, const QString& line);
std::unique_ptr<ICommandPriv> mp;
};
#endif // ICOMMAND_H