13 files changed, 125 insertions, 5 deletions

diff --git a/src/astfunction.cpp b/src/astfunction.cpp
index f5e25dc..c37a70d 100644
--- a/src/astfunction.cpp
+++ b/src/astfunction.cpp
@@ -14,7 +14,7 @@ AstFunction::~AstFunction()
         delete pAst;
 }
 
-Variable AstFunction::call( class GameState &gState )
+void AstFunction::call( class GameState &gState )
 {
         gState.parse( pAst );
 }
diff --git a/src/astfunction.h b/src/astfunction.h
index a546b19..5e71753 100644
--- a/src/astfunction.h
+++ b/src/astfunction.h
@@ -10,7 +10,7 @@ public:
         virtual ~AstFunction();
 
         virtual Bu::String getName() const { return sName; }
-        virtual Variable call( class GameState &gState );
+        virtual void call( class GameState &gState );
 
         void addParam( const Bu::String &sName );
         const Bu::StringList &getParamList() { return lParam; }
diff --git a/src/function.h b/src/function.h
index c1289f4..6696d5a 100644
--- a/src/function.h
+++ b/src/function.h
@@ -11,7 +11,7 @@ public:
         virtual ~Function();
 
         virtual Bu::String getName() const=0;
-        virtual Variable call( class GameState &gState )=0;
+        virtual void call( class GameState &gState )=0;
 };
 
 #endif
diff --git a/src/functiondelete.cpp b/src/functiondelete.cpp
new file mode 100644
index 0000000..c9bfef4
--- /dev/null
+++ b/src/functiondelete.cpp
@@ -0,0 +1,19 @@
+#include "functiondelete.h"
+
+#include "gamestate.h"
+
+FunctionDelete::FunctionDelete()
+{
+}
+
+FunctionDelete::~FunctionDelete()
+{
+}
+
+void FunctionDelete::call( class GameState &gState )
+{
+        Variable v = gState.pop();
+        VariableRef r = v.getVariableRef();
+        gState.delVariable( r.sName, r.sid );
+}
+
diff --git a/src/functiondelete.h b/src/functiondelete.h
new file mode 100644
index 0000000..3545343
--- /dev/null
+++ b/src/functiondelete.h
@@ -0,0 +1,16 @@
+#ifndef FUNCTION_DELETE_H
+#define FUNCTION_DELETE_H
+
+#include "function.h"
+
+class FunctionDelete : public Function
+{
+public:
+        FunctionDelete();
+        virtual ~FunctionDelete();
+
+        virtual Bu::String getName() const { return "delete"; }
+        virtual void call( class GameState &gState );
+};
+
+#endif
diff --git a/src/functiondisplay.cpp b/src/functiondisplay.cpp
index 332a2c9..fa5b79c 100644
--- a/src/functiondisplay.cpp
+++ b/src/functiondisplay.cpp
@@ -13,7 +13,7 @@ FunctionDisplay::~FunctionDisplay()
 {
 }
 
-Variable FunctionDisplay::call( class GameState &gState )
+void FunctionDisplay::call( class GameState &gState )
 {
         Variable v = gState.popDeref();
         sio << "Display:  " << v << sio.nl;
diff --git a/src/functiondisplay.h b/src/functiondisplay.h
index d1a63a9..3b7e828 100644
--- a/src/functiondisplay.h
+++ b/src/functiondisplay.h
@@ -10,7 +10,7 @@ public:
         virtual ~FunctionDisplay();
 
         virtual Bu::String getName() const { return "display"; }
-        virtual Variable call( class GameState &gState );
+        virtual void call( class GameState &gState );
 };
 
 #endif
diff --git a/src/functionexists.cpp b/src/functionexists.cpp
new file mode 100644
index 0000000..71e03f6
--- /dev/null
+++ b/src/functionexists.cpp
@@ -0,0 +1,19 @@
+#include "functionexists.h"
+
+#include "gamestate.h"
+
+FunctionExists::FunctionExists()
+{
+}
+
+FunctionExists::~FunctionExists()
+{
+}
+
+void FunctionExists::call( class GameState &gState )
+{
+        Variable v = gState.pop();
+        VariableRef r = v.getVariableRef();
+        gState.push( Variable( gState.hasVariable( r.sName, r.sid ) ) );
+}
+
diff --git a/src/functionexists.h b/src/functionexists.h
new file mode 100644
index 0000000..5313331
--- /dev/null
+++ b/src/functionexists.h
@@ -0,0 +1,16 @@
+#ifndef FUNCTION_EXISTS_H
+#define FUNCTION_EXISTS_H
+
+#include "function.h"
+
+class FunctionExists : public Function
+{
+public:
+        FunctionExists();
+        virtual ~FunctionExists();
+
+        virtual Bu::String getName() const { return "exists"; }
+        virtual void call( class GameState &gState );
+};
+
+#endif
diff --git a/src/game.cpp b/src/game.cpp
index 6c980ee..87d82b7 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -1,10 +1,14 @@
 #include "game.h"
 
 #include "functiondisplay.h"
+#include "functionexists.h"
+#include "functiondelete.h"
 
 Game::Game()
 {
         addFunction( new FunctionDisplay() );
+        addFunction( new FunctionExists() );
+        addFunction( new FunctionDelete() );
 }
 
 Game::~Game()
diff --git a/src/gamestate.cpp b/src/gamestate.cpp
index 902d0a9..a3758ce 100644
--- a/src/gamestate.cpp
+++ b/src/gamestate.cpp
@@ -65,6 +65,46 @@ void GameState::callFunction( const Bu::String &sName )
         pGame->getFunction( sName )->call( *this );
 }
 
+bool GameState::hasVariable( const Bu::String &sName, ScopeId id )
+{
+        switch( id )
+        {
+                case sidLocal:
+                        return lsLocal.peek()->has( sName );
+
+                case sidGlobal:
+                        return sGlobal.has( sName );
+
+                case sidPlayer:
+                        return sPlayer.has( sName );
+
+                case sidSituation:
+                        return hsSituation.get( sCurSituation )->has( sName );
+        }
+        
+        throw Bu::ExceptionBase("Really bad scopeid passed into getVariable");
+}
+
+void GameState::delVariable( const Bu::String &sName, ScopeId id )
+{
+        switch( id )
+        {
+                case sidLocal:
+                        return lsLocal.peek()->erase( sName );
+
+                case sidGlobal:
+                        return sGlobal.erase( sName );
+
+                case sidPlayer:
+                        return sPlayer.erase( sName );
+
+                case sidSituation:
+                        return hsSituation.get( sCurSituation )->erase( sName );
+        }
+        
+        throw Bu::ExceptionBase("Really bad scopeid passed into getVariable");
+}
+
 Variable GameState::getVariable( const Bu::String &sName, ScopeId id )
 {
         try
diff --git a/src/gamestate.h b/src/gamestate.h
index 6000419..61e18e8 100644
--- a/src/gamestate.h
+++ b/src/gamestate.h
@@ -26,6 +26,8 @@ public:
 
         void callFunction( const Bu::String &sName );
 
+        bool hasVariable( const Bu::String &sName, ScopeId id );
+        void delVariable( const Bu::String &sName, ScopeId id );
         Variable getVariable( const Bu::String &sName, ScopeId id=sidLocal );
         void setVariable( const Bu::String &sName, const Variable &v, ScopeId id=sidLocal );
 
diff --git a/test.stage b/test.stage
index 516471d..060e11d 100644
--- a/test.stage
+++ b/test.stage
@@ -48,6 +48,10 @@ situation <<start>>
                 display("This is the setup phase for start, " + name);
                 sillyDisplay( "Hello", name == player.name );
 
+                display( exists(name) );
+                delete( name );
+                display( exists(name) );
+
                 getThing();
                 myGoto( <<stuff>> );
                 display("You shouldn't see this.");