1 files changed, 83 insertions, 0 deletions
diff --git a/Source/cmGeneratorExpressionLexer.cxx b/Source/cmGeneratorExpressionLexer.cxx
new file mode 100644
index 0000000..1c83466
--- /dev/null
+++ b/Source/cmGeneratorExpressionLexer.cxx
@@ -0,0 +1,83 @@
+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2012 Stephen Kelly <steveire@gmail.com>
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#include "cmGeneratorExpressionLexer.h"
+
+
+//----------------------------------------------------------------------------
+cmGeneratorExpressionLexer::cmGeneratorExpressionLexer()
+  : SawBeginExpression(false), SawGeneratorExpression(false)
+{
+
+}
+
+//----------------------------------------------------------------------------
+static void InsertText(const char *upto, const char *c,
+                        std::vector<cmGeneratorExpressionToken> &result)
+{
+  if (upto != c)
+    {
+    result.push_back(cmGeneratorExpressionToken(
+                          cmGeneratorExpressionToken::Text, upto, c - upto));
+    }
+}
+
+//----------------------------------------------------------------------------
+std::vector<cmGeneratorExpressionToken>
+cmGeneratorExpressionLexer::Tokenize(const std::string& input)
+{
+  std::vector<cmGeneratorExpressionToken> result;
+
+  const char *c = input.c_str();
+  const char *upto = c;
+
+  for ( ; *c; ++c)
+    {
+    switch(*c)
+      {
+      case '$':
+        if(c[1] == '<')
+          {
+          InsertText(upto, c, result);
+          result.push_back(cmGeneratorExpressionToken(
+                           cmGeneratorExpressionToken::BeginExpression, c, 2));
+          upto = c + 2;
+          ++c;
+          SawBeginExpression = true;
+          }
+        break;
+      case '>':
+        InsertText(upto, c, result);
+        result.push_back(cmGeneratorExpressionToken(
+                            cmGeneratorExpressionToken::EndExpression, c, 1));
+        upto = c + 1;
+        SawGeneratorExpression = SawBeginExpression;
+        break;
+      case ':':
+        InsertText(upto, c, result);
+        result.push_back(cmGeneratorExpressionToken(
+                            cmGeneratorExpressionToken::ColonSeparator, c, 1));
+        upto = c + 1;
+        break;
+      case ',':
+        InsertText(upto, c, result);
+        result.push_back(cmGeneratorExpressionToken(
+                            cmGeneratorExpressionToken::CommaSeparator, c, 1));
+        upto = c + 1;
+        break;
+      default:
+        break;
+      }
+  }
+  InsertText(upto, c, result);
+
+  return result;
+}