1 files changed, 55 insertions, 0 deletions
diff --git a/Source/cmMathCommand.cxx b/Source/cmMathCommand.cxx
new file mode 100644
index 0000000..ca8b926
--- /dev/null
+++ b/Source/cmMathCommand.cxx
@@ -0,0 +1,55 @@
+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+
+  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 "cmMathCommand.h"
+
+#include "cmExprParserHelper.h"
+
+bool cmMathCommand::InitialPass(std::vector<std::string> const& args,
+                                cmExecutionStatus&)
+{
+  if (args.size() < 1) {
+    this->SetError("must be called with at least one argument.");
+    return false;
+  }
+  const std::string& subCommand = args[0];
+  if (subCommand == "EXPR") {
+    return this->HandleExprCommand(args);
+  }
+  std::string e = "does not recognize sub-command " + subCommand;
+  this->SetError(e);
+  return false;
+}
+
+bool cmMathCommand::HandleExprCommand(std::vector<std::string> const& args)
+{
+  if (args.size() != 3) {
+    this->SetError("EXPR called with incorrect arguments.");
+    return false;
+  }
+
+  const std::string& outputVariable = args[1];
+  const std::string& expression = args[2];
+
+  cmExprParserHelper helper;
+  if (!helper.ParseString(expression.c_str(), 0)) {
+    std::string e = "cannot parse the expression: \"" + expression + "\": ";
+    e += helper.GetError();
+    this->SetError(e);
+    return false;
+  }
+
+  char buffer[1024];
+  sprintf(buffer, "%d", helper.GetResult());
+
+  this->Makefile->AddDefinition(outputVariable, buffer);
+  return true;
+}