added Extrude and Polygon classes, still in progress

git-svn-id: svn://anubis/fart/trunk@269 7f9b0f55-74a9-4bce-be96-3c2cd072584d

parser/parser.yy

@@ -207,6 +207,7 @@ extrude_items: /* empty */
 extrude_item: polygon { $$ = $1; }
             | ngon { $$ = $1; }
             | offset { $$ = $1; }
+            | shape_item { $$ = $1; }
             ;
 
 intersect: INTERSECT LCURLY bool_items RCURLY {
@@ -309,9 +310,35 @@ number: DEC_NUMBER  { $$ = $1; }
 ngon: NGON DEC_NUMBER { $$ = new NGonNode($2->getInteger()); }
     ;
 
-offset: OFFSET number { $$ = new OffsetNode($2->getNumber()); }
+offset: OFFSET number {
+        $$ = new OffsetNode($2->getNumber());
+      }
+      | OFFSET number LCURLY offset_items RCURLY {
+        $$ = new OffsetNode($2->getNumber());
+        $$->addChildren($4);
+      }
       ;
 
+offset_items: /* empty */
+             | offset_item offset_items {
+                    $$ = new ItemsNode();
+                    $$->addChild($1);
+                    $$->addChildren($2);
+                }
+             ;
+
+offset_item: SCALE number {
+                $$ = new ScaleNode(new Vector($2->getNumber(), $2->getNumber(),
+                    $2->getNumber()));
+           }
+           | SCALE vector2 {
+                $$ = new ScaleNode($2->getVector());
+           }
+           | POSITION vector2 {
+                $$ = new PositionNode($2->getVector());
+           }
+           ;
+
 options: OPTIONS LCURLY options_items RCURLY {
             $$ = new OptionsNode();
             $$->addChildren($3);