/*=========================================================================

  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 cmLocalGenerator_h
#define cmLocalGenerator_h

#include "cmStandardIncludes.h"

class cmMakefile;
class cmGlobalGenerator;
class cmTarget;
class cmSourceFile;


/** \class cmLocalGenerator
 * \brief Create required build files for a directory.
 *
 * Subclasses of this abstract class generate makefiles, DSP, etc for various
 * platforms. This class should never be constructued directly. A
 * GlobalGenerator will create it and invoke the appropriate commands on it.
 */
class cmLocalGenerator
{
public:
  cmLocalGenerator();
  virtual ~cmLocalGenerator();
  
  /**
   * Generate the makefile for this directory. 
   */
  virtual void Generate() {};

  /**
   * Process the CMakeLists files for this directory to fill in the
   * m_Makefile ivar 
   */
  virtual void Configure();

  /**
   * Perform any final calculations prior to generation
   */
  virtual void ConfigureFinalPass();

  /**
   * Generate the install rules files in this directory.
   */
  virtual void GenerateInstallRules();

  /**
   * Generate the test files for tests.
   */
  virtual void GenerateTestFiles();
  

  ///! Get the makefile for this generator
  cmMakefile *GetMakefile() {
    return this->m_Makefile; };
  
  ///! Get the GlobalGenerator this is associated with
  cmGlobalGenerator *GetGlobalGenerator() {
    return m_GlobalGenerator; };

  ///! Set the Global Generator, done on creation by the GlobalGenerator
  void SetGlobalGenerator(cmGlobalGenerator *gg);

  /** 
   * Convert something to something else. This is a centralized coversion
   * routine used by the generators to handle relative paths and the like.
   * The flags determine what is actually done. 
   *
   * relative: treat the argument as a directory and convert it to make it
   * relative or full or unchanged. If relative (HOME, START etc) then that
   * specifies what it should be relative to.
   *
   * output: make the result suitable for output to a...
   *
   * optional: should any relative path operation be controlled by the rel
   * path setting
   */
  enum RelativeRoot { NONE, FULL, HOME, START, HOME_OUTPUT, START_OUTPUT };
  enum OutputFormat { UNCHANGED, MAKEFILE, SHELL };
  std::string Convert(const char* source, 
                      RelativeRoot relative, 
                      OutputFormat output = UNCHANGED,
                      bool optional = false);
  
  ///! Call this prior to using Convert
  void SetupPathConversions();
  
  /**
   * Convert the given path to an output path that is optionally
   * relative based on the cache option CMAKE_USE_RELATIVE_PATHS.  The
   * remote path must use forward slashes and not already be escaped
   * or quoted.
   */
  std::string ConvertToOptionallyRelativeOutputPath(const char* remote);

  // flag to determine if this project should be included in a parent project
  bool GetExcludeAll()
    {
      return m_ExcludeFromAll;
    }
  void SetExcludeAll(bool b)
    {
      m_ExcludeFromAll = b;
    }
  
  ///! set/get the parent generator 
  cmLocalGenerator* GetParent(){return m_Parent;}
  void SetParent(cmLocalGenerator* g) { m_Parent = g; g->AddChild(this); }

  ///! set/get the children
  void AddChild(cmLocalGenerator* g) { this->Children.push_back(g); }
  std::vector<cmLocalGenerator*>& GetChildren() { return this->Children; };
    

  void AddLanguageFlags(std::string& flags, const char* lang);
  void AddSharedFlags(std::string& flags, const char* lang, bool shared);
  void AddConfigVariableFlags(std::string& flags, const char* var);
  void AppendFlags(std::string& flags, const char* newFlags);
  ///! Get the include flags for the current makefile and language
  const char* GetIncludeFlags(const char* lang); 

  /** Translate a dependency as given in CMake code to the name to
      appear in a generated build file.  If the given name is that of
      a CMake target it will be transformed to the real output
      location of that target for the given configuration.  Otherwise
      the original name will be returned.  If the local argument is
      given it is set to indicate whethr the name is of a utility
      target available in the same makefile.  */
  std::string GetRealDependency(const char* name, const char* config,
                                bool* local=0);

  ///! for existing files convert to output path and short path if spaces
  std::string ConvertToOutputForExisting(const char* p);
  
  /** Called from command-line hook to check dependencies.  */
  virtual void CheckDependencies(cmMakefile* /* mf */, 
                                 bool /* verbose */,
                                 bool /* clear */) {};
  
  /** Called from command-line hook to scan dependencies.  */
  virtual bool ScanDependencies(std::vector<std::string> const& /* args */) {return true;};

  /** Compute the list of link libraries and directories for the given
      target and configuration.  */
  void ComputeLinkInformation(cmTarget& target, const char* config,
                              std::vector<cmStdString>& outLibs,
                              std::vector<cmStdString>& outDirs,
                              std::vector<cmStdString>* fullPathLibs=0);

protected:
  /** Construct a script from the given list of command lines.  */
  std::string ConstructScript(const cmCustomCommandLines& commandLines,
                              const char* newline = "\n");

  ///! Fill out these strings for the given target.  Libraries to link, flags, and linkflags.
  void GetTargetFlags(std::string& linkLibs, 
                      std::string& flags,
                      std::string& linkFlags,
                      cmTarget&target);
  
  ///! put all the libraries for a target on into the given stream
  virtual void OutputLinkLibraries(std::ostream&, const char* name,cmTarget &);

  /** Compute the string to use to refer to a target in an install
      file.  */
  std::string GetInstallReference(cmTarget& target, const char* config,
                                  std::vector<std::string> const& configs,
                                  bool implib = false);
  void PrepareInstallReference(std::ostream& fout, cmTarget& target,
                               std::vector<std::string> const& configs);

  /** Get the include flags for the current makefile and language.  */
  void GetIncludeDirectories(std::vector<std::string>& dirs);

  // Expand rule variables in CMake of the type found in language rules
  void ExpandRuleVariables(std::string& string,
                           const char* language,
                           const char* objects=0,
                           const char* target=0,
                           const char* linkLibs=0,
                           const char* source=0,
                           const char* object =0,
                           const char* flags = 0,
                           const char* objectsquoted = 0,
                           const char* targetSOName = 0,
                           const char* linkFlags = 0);
  // Expand rule variables in a single string
  std::string ExpandRuleVariable(std::string const& variable,
                                 const char* lang,
                                 const char* objects,
                                 const char* target,
                                 const char* linkLibs,
                                 const char* source,
                                 const char* object,
                                 const char* flags,
                                 const char* objectsquoted,
                                 const char* targetSOName,
                                 const char* linkFlags);
  
  ///! Convert a target to a utility target for unsupported languages of a generator
  void AddBuildTargetRule(const char* llang, cmTarget& target);
  ///! add a custom command to build a .o file that is part of a target 
  void AddCustomCommandToCreateObject(const char* ofname, 
                                      const char* lang, 
                                      cmSourceFile& source,
                                      cmTarget& target);
  // Create Custom Targets and commands for unsupported languages
  // The set passed in should contain the languages supported by the
  // generator directly.  Any targets containing files that are not
  // of the types listed will be compiled as custom commands and added
  // to a custom target.
  void CreateCustomTargetsAndCommands(std::set<cmStdString> const&);
  virtual void AddInstallRule(std::ostream& fout, const char* dest, int type, 
    const char* files, bool optional = false, const char* properties = 0);

  cmMakefile *m_Makefile;
  cmGlobalGenerator *m_GlobalGenerator;
  // members used for relative path function ConvertToMakefilePath
  std::string m_RelativePathToSourceDir;
  std::string m_RelativePathToBinaryDir;
  std::vector<std::string> m_HomeDirectoryComponents;
  std::vector<std::string> m_StartDirectoryComponents;
  std::vector<std::string> m_HomeOutputDirectoryComponents;
  std::vector<std::string> m_StartOutputDirectoryComponents;
  bool m_ExcludeFromAll;
  cmLocalGenerator* m_Parent;
  std::vector<cmLocalGenerator*> Children;
  std::map<cmStdString, cmStdString> m_LanguageToIncludeFlags;
  bool m_WindowsShell;
  bool m_ForceUnixPath;
  bool m_UseRelativePaths;
  bool m_IgnoreLibPrefix;
  bool Configured;
};

#endif