ENH: Moved variable and #cmakedefine replacement from cmConfigureFileCommand.cxx to a ConfigureString method on cmMakefile. This will give other commands access to the configuration code.

Source/cmConfigureFileCommand.cxx

@@ -110,33 +110,12 @@ void cmConfigureFileCommand::ConfigureFile()
     // now copy input to output and expand variables in the
     // input file at the same time
     std::string inLine;
-    cmsys::RegularExpression cmdefine("#cmakedefine[ \t]*([A-Za-z_0-9]*)");
+    std::string outLine;
     while( cmSystemTools::GetLineFromStream(fin, inLine) )
       {
-      m_Makefile->ExpandVariablesInString(inLine, m_EscapeQuotes, m_AtOnly);
-      m_Makefile->RemoveVariablesInString(inLine, m_AtOnly);
-      // look for special cmakedefine symbol and handle it
-      // is the symbol defined
-      if (cmdefine.find(inLine))
-        {
-        const char *def = m_Makefile->GetDefinition(cmdefine.match(1).c_str());
-        if(!cmSystemTools::IsOff(def))
-          {
-          cmSystemTools::ReplaceString(inLine,
-            "#cmakedefine", "#define");
-          fout << inLine << "\n";
-          }
-        else
-          {
-          cmSystemTools::ReplaceString(inLine,
-            "#cmakedefine", "#undef");
-          fout << "/* " << inLine << " */\n";
-          }
-        }
-      else
-        {
-        fout << inLine << "\n";
-        }
+      outLine = "";
+      m_Makefile->ConfigureString(inLine, outLine, m_AtOnly, m_EscapeQuotes);
+      fout << outLine.c_str() << "\n";
       }
     // close the files before attempting to copy
     fin.close();

Source/cmMakefile.cxx

@@ -67,7 +67,8 @@ cmMakefile::cmMakefile()
   this->AddSourceGroup("Header Files", "\\.(h|h\\+\\+|hm|hpp|hxx|in|txx|inl)$");
   this->AddSourceGroup("CMake Rules", "\\.rule$");
   this->AddDefaultDefinitions();
-}
+  m_cmDefineRegex.compile("#cmakedefine[ \t]*([A-Za-z_0-9]*)");
+  }
 
 const char* cmMakefile::GetReleaseVersion()
 {
@@ -2207,3 +2208,64 @@ std::string cmMakefile::GetModulesFile(const char* filename)
     }
   return "";
 }
+
+void cmMakefile::ConfigureString(const std::string& input,
+                                 std::string& output, bool atOnly,
+                                 bool escapeQuotes)
+{
+  // Split input to handle one line at a time.
+  std::string::const_iterator lineStart = input.begin();  
+  while(lineStart != input.end())
+    {
+    // Find the end of this line.
+    std::string::const_iterator lineEnd = lineStart;
+    while(lineEnd != input.end() && *lineEnd != '\n')
+      {
+      ++lineEnd;
+      }
+
+    // Copy the line.
+    std::string line(lineStart, lineEnd);
+
+    // Skip the newline character.
+    bool haveNewline = (lineEnd != input.end());
+    if(haveNewline)
+      {
+      ++lineEnd;
+      }
+
+    // Replace #cmakedefine instances.
+    if(m_cmDefineRegex.find(line))
+      {
+      const char* def = this->GetDefinition(m_cmDefineRegex.match(1).c_str());
+      if(!cmSystemTools::IsOff(def))
+        {
+        cmSystemTools::ReplaceString(line, "#cmakedefine", "#define");
+        output += line;
+        }
+      else
+        {
+        cmSystemTools::ReplaceString(line, "#cmakedefine", "#undef");
+        output += "/* ";
+        output += line;
+        output += " */";
+        }
+      }
+    else
+      {
+      output += line;
+      }
+
+    if(haveNewline)
+      {
+      output += "\n";
+      }
+
+    // Move to the next line.
+    lineStart = lineEnd;
+    }
+
+  // Perform variable replacements.
+  this->ExpandVariablesInString(output, escapeQuotes, atOnly);
+  this->RemoveVariablesInString(output, atOnly);
+}

Source/cmMakefile.h

@@ -24,6 +24,8 @@
 #include "cmListFileCache.h"
 #include "cmCacheManager.h"
 
+#include <cmsys/RegularExpression.hxx>
+
 class cmFunctionBlocker;
 class cmCommand;
 class cmLocalGenerator;
@@ -541,7 +543,14 @@ public:
    */
   void ExpandVariables();  
   void ExpandVariablesInCustomCommands();
-  
+
+  /**
+   * Replace variables and #cmakedefine lines in the given string.
+   * See cmConfigureFileCommand for details.
+   */
+  void ConfigureString(const std::string& input, std::string& output,
+                       bool atOnly, bool escapeQuotes);
+
   /**
    * find what source group this source is in
    */
@@ -693,6 +702,8 @@ private:
 
   // used in AddDefinition for performance improvement
   DefinitionMap::key_type  m_TemporaryDefinitionKey;
+
+  cmsys::RegularExpression m_cmDefineRegex;
 };