added Scene::processForNode() to process for nodes

git-svn-id: svn://anubis/fart/branches/scene-file-scripting@332 7f9b0f55-74a9-4bce-be96-3c2cd072584d

parser/nodes.h

@@ -42,6 +42,11 @@ class Node
             std::cerr << "Warning: Node::getString() called!" << std::endl;
             return "";
         }
+        virtual refptr<Node> getNode(int idx)
+        {
+            std::cerr << "Warning: Node::getNode() called!" << std::endl;
+            return NULL;
+        }
 
         virtual bool isShape() { return false; }
         virtual bool isMaterial() { return false; }
@@ -550,11 +555,21 @@ class ForNode : public Node
 {
     public:
         ForNode(refptr<Node> e1, refptr<Node> e2, refptr<Node> e3)
-            : m_e1(e1), m_e2(e2), m_e3(e3)
         {
+            m_nodes[0] = e1;
+            m_nodes[1] = e2;
+            m_nodes[2] = e3;
+        }
+        refptr<Node> getNode(int idx)
+        {
+            if (0 <= idx && idx <= 2)
+            {
+                return m_nodes[idx];
+            }
+            return NULL;
         }
     protected:
-        refptr<Node> m_e1, m_e2, m_e3;
+        refptr<Node> m_nodes[3];
 };
 
 #endif

parser/parser.yy

@@ -593,6 +593,10 @@ expression: term                    { $$ = $1; }
           | stmt_expression         { $$ = $1; }
           ;
 
+maybe_expression: /* empty */
+                | expression        { $$ = $1; }
+                ;
+
 stmt_expression: assignment              { $$ = $1; }
                | local_assignment        { $$ = $1; }
                | local_decl              { $$ = $1; }
@@ -640,7 +644,7 @@ local_decl: LOCAL VARREF {
           }
           ;
 
-for: FOR LPAREN expression SEMICOLON bool_expression SEMICOLON expression RPAREN LCURLY general_items RCURLY {
+for: FOR LPAREN maybe_expression SEMICOLON bool_expression SEMICOLON maybe_expression RPAREN LCURLY general_items RCURLY {
     $$ = new ForNode($3, $5, $7);
     $$->addChildren($10);
    }