CMake/Source/cmCommand.h

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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.
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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.
=========================================================================*/
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#ifndef cmCommand_h
#define cmCommand_h
#include "cmObject.h"
#include "cmListFileCache.h"
#include "cmMakefile.h"
#include "cmCommandArgumentsHelper.h"
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/** \class cmCommand
* \brief Superclass for all commands in CMake.
*
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* 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 cmObject
{
public:
cmTypeMacro(cmCommand, cmObject);
/**
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* Construct the command. By default it is enabled with no makefile.
*/
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cmCommand()
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{this->Makefile = 0; this->Enabled = true;}
/**
* Need virtual destructor to destroy real command type.
*/
virtual ~cmCommand() {}
/**
* Specify the makefile.
*/
void SetMakefile(cmMakefile*m)
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{this->Makefile = m; }
cmMakefile* GetMakefile() { return this->Makefile; }
/**
* 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,
cmExecutionStatus &status)
{
std::vector<std::string> expandedArguments;
if(!this->Makefile->ExpandArguments(args, expandedArguments))
{
// There was an error expanding arguments. It was already
// reported, so we can skip this command without error.
return true;
}
return this->InitialPass(expandedArguments,status);
}
/**
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* This is called when the command is first encountered in
* the CMakeLists.txt file.
*/
virtual bool InitialPass(std::vector<std::string> const& args,
cmExecutionStatus &) = 0;
/**
* This is called at the end after all the information
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* 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.
*/
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virtual void FinalPass() {};
/**
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* This is a virtual constructor for the command.
*/
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virtual cmCommand* Clone() = 0;
/**
* This determines if the command is invoked when in script mode.
*/
virtual bool IsScriptable()
{
return false;
}
/**
* This determines if usage of the method is discouraged or not.
* This is currently only used for generating the documentation.
*/
virtual bool IsDiscouraged()
{
return false;
}
/**
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* The name of the command as specified in CMakeList.txt.
*/
virtual const char* GetName() = 0;
/**
* Succinct documentation.
*/
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virtual const char* GetTerseDocumentation() = 0;
/**
* More documentation.
*/
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virtual const char* GetFullDocumentation() = 0;
/**
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* Enable the command.
*/
void EnabledOn()
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{this->Enabled = true;}
/**
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* Disable the command.
*/
void EnabledOff()
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{this->Enabled = false;}
/**
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* Query whether the command is enabled.
*/
bool GetEnabled()
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{return this->Enabled;}
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/**
* Disable or enable the command.
*/
void SetEnabled(bool enabled)
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{this->Enabled = enabled;}
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/**
* Return the last error string.
*/
const char* GetError()
{
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if(this->Error.length() == 0)
{
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this->Error = this->GetName();
this->Error += " unknown error.";
}
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return this->Error.c_str();
}
/**
* Set the error message
*/
void SetError(const char* e)
{
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this->Error = this->GetName();
this->Error += " ";
this->Error += e;
}
protected:
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cmMakefile* Makefile;
cmCommandArgumentsHelper Helper;
private:
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bool Enabled;
std::string Error;
};
#endif