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/*=========================================================================
Program: CMake - Cross-Platform Makefile Generator
Module: $RCSfile$
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) 2002 Kitware, Inc., Insight Consortium. All rights reserved.
See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef cmCommand_h
#define cmCommand_h
#include "cmListFileCache.h"
#include "cmMakefile.h"
/** \class cmCommand
* \brief Superclass for all commands in CMake.
*
* cmCommand is the base class for all commands in CMake. A command
* manifests as an entry in CMakeLists.txt and produces one or
* more makefile rules. Commands are associated with a particular
* makefile. This base class cmCommand defines the API for commands
* to support such features as enable/disable, inheritance,
* documentation, and construction.
*/
class cmCommand
{
public:
/**
* Construct the command. By default it is enabled with no makefile.
*/
cmCommand()
{m_Makefile = 0; m_Enabled = true;}
/**
* Need virtual destructor to destroy real command type.
*/
virtual ~cmCommand() {}
/**
* Specify the makefile.
*/
void SetMakefile(cmMakefile*m)
{m_Makefile = m; }
/**
* This is called by the cmMakefile when the command is first
* encountered in the CMakeLists.txt file. It expands the command's
* arguments and then invokes the InitialPass.
*/
virtual bool InvokeInitialPass(const std::vector<cmListFileArgument>& args)
{
std::vector<std::string> expandedArguments;
m_Makefile->ExpandArguments(args, expandedArguments);
return this->InitialPass(expandedArguments);
}
/**
* This is called when the command is first encountered in
* the CMakeLists.txt file.
*/
virtual bool InitialPass(std::vector<std::string> const& args) = 0;
/**
* This is called at the end after all the information
* specified by the command is accumulated. Most commands do
* not implement this method. At this point, reading and
* writing to the cache can be done.
*/
virtual void FinalPass() {};
/**
* This is a virtual constructor for the command.
*/
virtual cmCommand* Clone() = 0;
/**
* This determines if the command gets propagated down
* to makefiles located in subdirectories.
*/
virtual bool IsInherited()
{
return false;
}
/**
* This determines if the command is invoked when in script mode.
*/
virtual bool IsScriptable()
{
return false;
}
/**
* This determines if the method is deprecated or not.
*/
virtual bool IsDeprecated(int /*major*/, int /*minor*/)
{
return false;
}
/**
* The name of the command as specified in CMakeList.txt.
*/
virtual const char* GetName() = 0;
/**
* Succinct documentation.
*/
virtual const char* GetTerseDocumentation() = 0;
/**
* More documentation.
*/
virtual const char* GetFullDocumentation() = 0;
/**
* Enable the command.
*/
void EnabledOn()
{m_Enabled = true;}
/**
* Disable the command.
*/
void EnabledOff()
{m_Enabled = false;}
/**
* Query whether the command is enabled.
*/
bool GetEnabled()
{return m_Enabled;}
/**
* Disable or enable the command.
*/
void SetEnabled(bool enabled)
{m_Enabled = enabled;}
/**
* Return the last error string.
*/
const char* GetError()
{
if(m_Error.length() == 0)
{
m_Error = this->GetName();
m_Error += " unknown error.";
}
return m_Error.c_str();
}
/**
* Returns true if this class is the given class, or a subclass of it.
*/
static bool IsTypeOf(const char *type)
{ return !strcmp("cmCommand", type); }
/**
* Returns true if this object is an instance of the given class or
* a subclass of it.
*/
virtual bool IsA(const char *type)
{ return cmCommand::IsTypeOf(type); }
protected:
void SetError(const char* e)
{
m_Error = this->GetName();
m_Error += " ";
m_Error += e;
}
cmMakefile* m_Makefile;
private:
bool m_Enabled;
std::string m_Error;
};
// All subclasses of cmCommand should invoke this macro.
#define cmTypeMacro(thisClass,superclass) \
typedef superclass Superclass; \
static bool IsTypeOf(const char *type) \
{ \
if ( !strcmp(#thisClass,type) ) \
{ \
return true; \
} \
return Superclass::IsTypeOf(type); \
} \
virtual bool IsA(const char *type) \
{ \
return thisClass::IsTypeOf(type); \
} \
static thisClass* SafeDownCast(cmCommand *c) \
{ \
if ( c && c->IsA(#thisClass) ) \
{ \
return (thisClass *)c; \
} \
return 0;\
}
#endif
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