From 494c3cd485a8ac243ba96fdd8ac60b5df1b023d7 Mon Sep 17 00:00:00 2001
From: Glenn Maynard <gmaynard@users.sourceforge.net>
Date: Fri, 22 Sep 2006 18:53:39 +0000
Subject: [PATCH] LuaHelpers::RunExpression

---
 stepmania/src/LuaManager.cpp | 11 +++++++++++
 stepmania/src/LuaManager.h   |  4 ++++
 2 files changed, 15 insertions(+)

diff --git a/stepmania/src/LuaManager.cpp b/stepmania/src/LuaManager.cpp
index 9f29caeed2..64f423a82c 100644
--- a/stepmania/src/LuaManager.cpp
+++ b/stepmania/src/LuaManager.cpp
@@ -539,6 +539,17 @@ bool LuaHelpers::RunScript( Lua *L, const RString &sExpression, const RString &s
 	return true;
 }
 
+bool LuaHelpers::RunExpression( Lua *L, const RString &sExpression )
+{
+	RString sFullExpression = "return " + sExpression;
+
+	bool bSuccess = LuaHelpers::RunScript( L, sFullExpression, "", 1 );
+	if( !bSuccess )
+		lua_pushnil( L );
+
+	return bSuccess;
+}
+
 bool LuaHelpers::RunExpressionB( const RString &str )
 {
 	Lua *L = LUA->Get();
diff --git a/stepmania/src/LuaManager.h b/stepmania/src/LuaManager.h
index bffdaa9c08..3431a3964c 100644
--- a/stepmania/src/LuaManager.h
+++ b/stepmania/src/LuaManager.h
@@ -56,6 +56,10 @@ namespace LuaHelpers
 	 * The return value is left on the Lua stack. */
 	bool RunScript( Lua *L, const RString &sExpression, const RString &sName = "", int iReturnValues = 0 );
 
+	/* Run the given expression, returning a single value, and leave the return value on the
+	 * stack.  On error, push nil. */
+	bool RunExpression( Lua *L, const RString &sExpression );
+
 	bool RunScriptFile( const RString &sFile );
 
 	/* Strip "//" comments and "+". */