From c1b3484c2d5e2bce3234fba775af4a39182ccbc4 Mon Sep 17 00:00:00 2001
From: Alexander Neundorf <neundorf@kde.org>
Date: Tue, 21 Aug 2007 11:30:09 -0400
Subject: ENH: store the matches for paren-delimited subexpression in
 CMAKE_MATCH_[0..9] variables, so to get multiple subexpressions from one
 string STRING(REGEX MATCH) has to be executed only once

Alex
---
 Source/cmStringCommand.cxx | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/Source/cmStringCommand.cxx b/Source/cmStringCommand.cxx
index 4bc9ca6..437b121 100644
--- a/Source/cmStringCommand.cxx
+++ b/Source/cmStringCommand.cxx
@@ -248,6 +248,7 @@ bool cmStringCommand::RegexMatch(std::vector<std::string> const& args)
     input += args[i];
     }
   
+  this->ClearMatches();
   // Compile the regular expression.
   cmsys::RegularExpression re;
   if(!re.compile(regex.c_str()))
@@ -262,6 +263,7 @@ bool cmStringCommand::RegexMatch(std::vector<std::string> const& args)
   std::string output;
   if(re.find(input.c_str()))
     {
+    this->StoreMatches(re);
     std::string::size_type l = re.start();
     std::string::size_type r = re.end();
     if(r-l == 0)
@@ -295,6 +297,7 @@ bool cmStringCommand::RegexMatchAll(std::vector<std::string> const& args)
     input += args[i];
     }
   
+  this->ClearMatches();
   // Compile the regular expression.
   cmsys::RegularExpression re;
   if(!re.compile(regex.c_str()))
@@ -311,6 +314,7 @@ bool cmStringCommand::RegexMatchAll(std::vector<std::string> const& args)
   const char* p = input.c_str();
   while(re.find(p))
     {
+    this->StoreMatches(re);
     std::string::size_type l = re.start();
     std::string::size_type r = re.end();
     if(r-l == 0)
@@ -397,6 +401,7 @@ bool cmStringCommand::RegexReplace(std::vector<std::string> const& args)
     input += args[i];
     }
   
+  this->ClearMatches();
   // Compile the regular expression.
   cmsys::RegularExpression re;
   if(!re.compile(regex.c_str()))
@@ -413,6 +418,7 @@ bool cmStringCommand::RegexReplace(std::vector<std::string> const& args)
   std::string::size_type base = 0;
   while(re.find(input.c_str()+base))
     {
+    this->StoreMatches(re);
     std::string::size_type l2 = re.start();
     std::string::size_type r = re.end();
     
@@ -473,6 +479,28 @@ bool cmStringCommand::RegexReplace(std::vector<std::string> const& args)
 }
 
 //----------------------------------------------------------------------------
+void cmStringCommand::ClearMatches()
+{
+  for (unsigned int i=0; i<10; i++)
+    {
+    char name[128];
+    sprintf(name, "CMAKE_MATCH_%d", i);
+    this->Makefile->AddDefinition(name, "");
+    }
+}
+
+//----------------------------------------------------------------------------
+void cmStringCommand::StoreMatches(cmsys::RegularExpression& re)
+{
+  for (unsigned int i=0; i<10; i++)
+    {
+    char name[128];
+    sprintf(name, "CMAKE_MATCH_%d", i);
+    this->Makefile->AddDefinition(name, re.match(i).c_str());
+    }
+}
+
+//----------------------------------------------------------------------------
 bool cmStringCommand::HandleCompareCommand(std::vector<std::string> const&
                                            args)
 {
-- 
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