Add shapes to grammar

src/fart.propane

@@ -22,15 +22,33 @@ static bool parse_number(uint8_t const * match_text, size_t match_length, double
 >>
 
 drop /\s+/;
+drop /#.*/;
 
 token background;
+token box;
+token camera;
+token color;
 token comma /,/;
+token cyl;
 token gt />/;
 token height;
+token intersect;
 token lcurly /\{/;
 token lt /</;
+token material;
 token options;
+token plane;
+token position;
 token rcurly /\}/;
+token rotate;
+token scale;
+token size;
+token sphere;
+token subtract;
+token target;
+token translate;
+token union;
+token up;
 token width;
 
 token uint /\d+/ <<
@@ -46,10 +64,12 @@ token number /-?\d+(\.\d+)?/ <<
     }
 >>
 
-Start -> Options? SceneItems;
+start Scene;
 
 Background -> background Vector;
 
+Color -> color Vector;
+
 Height -> height uint;
 
 Number -> uint;
@@ -64,7 +84,49 @@ OptionsItem -> Background;
 OptionsItem -> Height;
 OptionsItem -> Width;
 
+Position -> position Vector;
+
+Rotate -> rotate Number comma Vector;
+Rotate -> rotate Number comma Vector lcurly SceneItems rcurly;
+
+Scale -> scale Number;
+Scale -> scale Number lcurly SceneItems rcurly;
+Scale -> scale Vector;
+Scale -> scale Vector lcurly SceneItems rcurly;
+
+SceneItemBlock -> SceneItemName lcurly SceneItems rcurly;
+
+Scene -> Options? SceneItems;
+
 SceneItems -> ;
+SceneItems -> SceneItem SceneItems;
+
+SceneItem -> Color;
+SceneItem -> Position;
+SceneItem -> Rotate;
+SceneItem -> Scale;
+SceneItem -> SceneItemBlock;
+SceneItem -> Size;
+SceneItem -> Target;
+SceneItem -> Translate;
+SceneItem -> Up;
+
+SceneItemName -> box;
+SceneItemName -> camera;
+SceneItemName -> cyl;
+SceneItemName -> material;
+SceneItemName -> plane;
+SceneItemName -> sphere;
+
+Size -> size Number;
+Size -> size Vector;
+
+Target -> target Vector;
+
+Translate -> translate Vector;
+Translate -> translate Vector lcurly SceneItems rcurly;
+
+Up -> up Vector;
 
 Vector -> lt Number comma Number comma Number gt;
 Vector -> lt Number comma Number comma Number comma Number gt;