Add option of watching variables

8 files changed, 203 insertions, 3 deletions

diff --git a/Source/CMakeLists.txt b/Source/CMakeLists.txt
index 358442d..f7bac8b 100644
--- a/Source/CMakeLists.txt
+++ b/Source/CMakeLists.txt
@@ -20,6 +20,7 @@ cmGlobalGenerator.cxx
 cmGlobalUnixMakefileGenerator.cxx
 cmLocalGenerator.cxx
 cmLocalUnixMakefileGenerator.cxx
+cmVariableWatch.cxx
 cmake.h
 cmakewizard.h
 cmMakeDepend.h
@@ -39,6 +40,7 @@ cmGlobalGenerator.h
 cmGlobalUnixMakefileGenerator.h
 cmLocalGenerator.h
 cmLocalUnixMakefileGenerator.h
+cmVariableWatch.h
 )
 
 # configure the .h file
diff --git a/Source/Makefile.in b/Source/Makefile.in
index 8b069e9..1d8bd9a 100644
--- a/Source/Makefile.in
+++ b/Source/Makefile.in
@@ -32,6 +32,7 @@ cmTarget.o \
 cmCustomCommand.o \
 cmCacheManager.o \
 cmListFileCache.o \
+cmVariableWatch.o \
 cmSourceGroup.o
 
 DEPENDS = cmConfigure.h @CMAKE_ROOT_DIR@/Source/*.h
@@ -56,6 +57,7 @@ cmCommands.o : $(DEPENDS) $(srcdir)/*Command*.cxx
 cmTarget.o : $(DEPENDS)
 cmCacheManager.o : $(DEPENDS)
 cmSourceGroup.o : $(DEPENDS)
+cmVariableWatch.o : $(DEPENDS)
 
 
 cmake: ${OBJS}
diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index 8c44fb8..c26d5ab 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -26,6 +26,7 @@
 #include "cmCacheManager.h"
 #include "cmFunctionBlocker.h"
 #include "cmListFileCache.h"
+#include "cmVariableWatch.h"
 #include "cmake.h"
 #include <stdio.h>  // required for sprintf
 
@@ -558,6 +559,11 @@ void cmMakefile::AddDefinition(const char* name, const char* value)
     }
   m_Definitions.erase( DefinitionMap::key_type(name));
   m_Definitions.insert(DefinitionMap::value_type(name, value));
+  cmVariableWatch* vv = this->GetVariableWatch();
+  if ( vv )
+    {
+    vv->VariableAccessed(name, cmVariableWatch::VARIABLE_MODIFIED_ACCESS);
+    }
 }
 
 
@@ -582,6 +588,11 @@ void cmMakefile::AddDefinition(const char* name, bool value)
     m_Definitions.erase( DefinitionMap::key_type(name));
     m_Definitions.insert(DefinitionMap::value_type(name, "OFF"));
     }
+  cmVariableWatch* vv = this->GetVariableWatch();
+  if ( vv )
+    {
+    vv->VariableAccessed(name, cmVariableWatch::VARIABLE_MODIFIED_ACCESS);
+    }
 }
 
 
@@ -594,6 +605,11 @@ void cmMakefile::AddCacheDefinition(const char* name, bool value, const char* do
 void cmMakefile::RemoveDefinition(const char* name)
 {
   m_Definitions.erase(DefinitionMap::key_type(name));
+  cmVariableWatch* vv = this->GetVariableWatch();
+  if ( vv )
+    {
+    vv->VariableAccessed(name, cmVariableWatch::VARIABLE_REMOVED_ACCESS);
+    }
 }
 
 void cmMakefile::SetProjectName(const char* p)
@@ -860,7 +876,7 @@ std::string cmMakefile::GetParentListFileName(const char *currentFileName)
 
 void cmMakefile::ExpandVariables()
 {
-  // Now expand varibles in the include and link strings
+  // Now expand variables in the include and link strings
   for(std::vector<std::string>::iterator d = m_IncludeDirectories.begin();
         d != m_IncludeDirectories.end(); ++d)
     {
@@ -886,12 +902,29 @@ bool cmMakefile::IsOn(const char* name) const
 
 const char* cmMakefile::GetDefinition(const char* name) const
 {
+  const char* def = 0;
   DefinitionMap::const_iterator pos = m_Definitions.find(name);
   if(pos != m_Definitions.end())
     {
-    return (*pos).second.c_str();
+    def = (*pos).second.c_str();
+    }
+  else
+    {
+    def = this->GetCacheManager()->GetCacheValue(name);
     }
-  return this->GetCacheManager()->GetCacheValue(name);
+  cmVariableWatch* vv = this->GetVariableWatch();
+  if ( vv )
+    {
+    if ( def )
+      {
+      vv->VariableAccessed(name, cmVariableWatch::VARIABLE_READ_ACCESS);
+      }
+    else 
+      {
+      vv->VariableAccessed(name, cmVariableWatch::UNKNOWN_VARIABLE_READ_ACCESS);
+      }
+    }
+  return def;
 }
 
 
@@ -1430,6 +1463,25 @@ int cmMakefile::TryCompile(const char *srcdir, const char *bindir,
   return ret;
 }
 
+cmake *cmMakefile::GetCMakeInstance() const
+{
+  if ( m_LocalGenerator && m_LocalGenerator->GetGlobalGenerator() )
+    {
+    return m_LocalGenerator->GetGlobalGenerator()->GetCMakeInstance();
+    }
+  return 0;
+}
+
+cmVariableWatch *cmMakefile::GetVariableWatch() const
+{
+  if ( this->GetCMakeInstance() &&
+       this->GetCMakeInstance()->GetVariableWatch() )
+    {
+    return this->GetCMakeInstance()->GetVariableWatch();
+    }
+  return 0;
+}
+
 cmCacheManager *cmMakefile::GetCacheManager() const
 {
   return m_LocalGenerator->GetGlobalGenerator()->GetCMakeInstance()->GetCacheManager();
diff --git a/Source/cmMakefile.h b/Source/cmMakefile.h
index 399b2ac..558066b 100644
--- a/Source/cmMakefile.h
+++ b/Source/cmMakefile.h
@@ -30,6 +30,7 @@ class cmCommand;
 class cmLocalGenerator;
 class cmMakeDepend;
 class cmSourceFile;
+class cmVariableWatch;
 
 /** \class cmMakefile
  * \brief Process the input CMakeLists.txt file.
@@ -531,6 +532,8 @@ public:
    * given a current CMakeLists file name
    */
   cmCacheManager *GetCacheManager() const;
+  cmake *GetCMakeInstance() const;
+  cmVariableWatch* GetVariableWatch() const;
 
   //! Determine wether this is a local or global build.
   bool GetLocal() const;
diff --git a/Source/cmVariableWatch.cxx b/Source/cmVariableWatch.cxx
new file mode 100644
index 0000000..74548fb
--- /dev/null
+++ b/Source/cmVariableWatch.cxx
@@ -0,0 +1,59 @@
+/*=========================================================================
+
+  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.
+
+=========================================================================*/
+#include "cmVariableWatch.h"
+
+cmVariableWatch::cmVariableWatch()
+{
+}
+
+cmVariableWatch::~cmVariableWatch()
+{
+}
+
+void cmVariableWatch::AddWatch(const std::string& variable, 
+                               WatchMethod method, void* client_data /*=0*/)
+{
+  cmVariableWatch::Pair p;
+  p.m_Method = method;
+  p.m_ClientData = client_data;
+  cmVariableWatch::VectorOfPairs* vp = &m_WatchMap[variable];
+  cmVariableWatch::VectorOfPairs::size_type cc;
+  for ( cc = 0; cc < vp->size(); cc ++ )
+    {
+    cmVariableWatch::Pair* pair = &(*vp)[cc];
+    if ( pair->m_Method == method )
+      {
+      (*vp)[cc] = p;
+      return;
+      }
+    }
+  vp->push_back(p);
+}
+
+void  cmVariableWatch::VariableAccessed(const std::string& variable, int access_type) const
+{
+  cmVariableWatch::StringToVectorOfPairs::const_iterator mit = m_WatchMap.find(variable);
+  if ( mit  != m_WatchMap.end() )
+    {
+    const cmVariableWatch::VectorOfPairs* vp = &mit->second;
+    cmVariableWatch::VectorOfPairs::const_iterator it;
+    for ( it = vp->begin(); it != vp->end(); it ++ )
+      {
+      it->m_Method(variable, access_type, it->m_ClientData);
+      }
+    }
+}
diff --git a/Source/cmVariableWatch.h b/Source/cmVariableWatch.h
new file mode 100644
index 0000000..88fdd54
--- /dev/null
+++ b/Source/cmVariableWatch.h
@@ -0,0 +1,72 @@
+/*=========================================================================
+
+  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 cmVariableWatch_h
+#define cmVariableWatch_h
+
+#include "cmStandardIncludes.h"
+
+/** \class cmVariableWatch
+ * \brief Helper class for watching of variable accesses.
+ *
+ * Calls function when variable is accessed
+ */
+class cmVariableWatch
+{
+public:
+  typedef void (WatchMethod)(const std::string& variable, int access_type, void* client_data);
+
+  cmVariableWatch();
+  ~cmVariableWatch();
+
+  /**
+   * Add watch to the variable
+   */
+  void AddWatch(const std::string& variable, WatchMethod method, void* client_data=0);
+  
+  /**
+   * This method is called when variable is accessed
+   */
+  void VariableAccessed(const std::string& variable, int access_type) const;
+
+  /**
+   * Different access types.
+   */
+  enum
+    {
+      VARIABLE_READ_ACCESS,
+      UNKNOWN_VARIABLE_READ_ACCESS,
+      VARIABLE_MODIFIED_ACCESS,
+      VARIABLE_REMOVED_ACCESS,
+      NO_ACCESS
+    };
+  
+protected:
+  struct Pair
+  {
+    WatchMethod* m_Method;
+    void*        m_ClientData;
+    Pair() : m_Method(0), m_ClientData(0) {}
+  };
+
+  typedef std::vector< Pair > VectorOfPairs;
+  typedef std::map<std::string, VectorOfPairs > StringToVectorOfPairs;
+
+  StringToVectorOfPairs m_WatchMap;
+};
+
+
+#endif
diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index 5a4fa1f..e6b1fe6 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -21,6 +21,7 @@
 #include "cmLocalGenerator.h"
 #include "cmCommands.h"
 #include "cmCommand.h"
+#include "cmVariableWatch.h"
 
 // include the generator
 #if defined(_WIN32) && !defined(__CYGWIN__)
@@ -62,6 +63,7 @@ cmake::cmake()
   m_GlobalGenerator = 0;
   m_ProgressCallback = 0;
   m_ProgressCallbackClientData = 0;
+  m_VariableWatch = new cmVariableWatch;
 
   this->AddDefaultCommands();
 }
@@ -79,6 +81,7 @@ cmake::~cmake()
     {
     delete (*j).second;
     }
+  delete m_VariableWatch;
 }
 
 bool cmake::CommandExists(const char* name) const
diff --git a/Source/cmake.h b/Source/cmake.h
index 602f152..d6ecbe5 100644
--- a/Source/cmake.h
+++ b/Source/cmake.h
@@ -45,6 +45,7 @@ class cmLocalGenerator;
 class cmCacheManager;
 class cmMakefile;
 class cmCommand;
+class cmVariableWatch;
 
 class cmake
 {
@@ -227,6 +228,10 @@ class cmake
   ///! this is called by generators to update the progress
   void UpdateProgress(const char *msg, float prog);
 
+
+  ///! Get the variable watch object
+  cmVariableWatch* GetVariableWatch() { return m_VariableWatch; }
+
 protected:
   typedef std::map<cmStdString, cmCommand*> RegisteredCommandsMap;
   RegisteredCommandsMap m_Commands;
@@ -252,6 +257,8 @@ protected:
    */
   int AddCMakePaths(const char *arg0);
 
+  cmVariableWatch* m_VariableWatch;
+
 private:
   ProgressCallback m_ProgressCallback;
   void* m_ProgressCallbackClientData;