reimplement parsing code (but program does not compile yet because I have to change type of 'USE_SQUARES' constructure)

fcore/layer-tree.sml

@@ -9,6 +9,9 @@ struct
     in NODE {key = minKey, value = grid, left = LEAF, right = LEAF}
     end
 
+  fun singleton grid =
+    NODE {key = minKey, value = grid, left = LEAF, right = LEAF}
+
   fun insert (newKey, newValue, tree) =
     case tree of
       LEAF => NODE {key = newKey, value = newValue, left = LEAF, right = LEAF}

fcore/parser/parser.md

@@ -11,9 +11,9 @@ int ::= (0-9)+
 
 item ::= **{** int int int int int int int int **}**
 
-grid ::= **[** item **]**
+layer ::= **[** item **]**
 
-grid_list ::= int int **{** (grid)+ **}**
+layer_tree ::= int int **{** (layer)* **}**
 ```
 
 The first two `int`s in the grid `int int **{** (item)+ **}**` always follow the order: `canvasWidth canvasHeight`.

fcore/parser/parser.mlb

@@ -1,16 +0,0 @@
-$(SML_LIB)/basis/basis.mlb
-
-ann
-  "allowVectorExps true"
-in
-  space-dfa.sml
-  int-dfa.sml
-  brace-dfa.sml
-  all-dfa.sml
-end
-
-tokens.sml
-lexer.sml
-
-parse-grid.sml
-parser.sml

fcore/parser/parser.sml

@@ -18,20 +18,32 @@ struct
         end
     | _ => SOME (tokens, grid)
 
+  fun parseLayers (tokens, canvasWidth, canvasHeight, tree, counter) =
+    let
+      val grid = ParseGrid.make (canvasWidth, canvasHeight)
+    in
+      case parseItems (tokens, grid) of
+        SOME (tokens, grid) =>
+          let val tree = LayerTree.insert (counter, grid, tree)
+          in parseLayers (tokens, canvasWidth, canvasHeight, tree, counter + 1)
+          end
+      | NONE => (tokens, tree)
+    end
+
   fun parse string =
     case Lexer.scan string of
       SOME tokens =>
         (case tokens of
-           T.INT canvasWidth :: T.INT canvasHeight :: T.L_BRACE :: tl =>
+           T.INT canvasWidth :: T.INT canvasHeight :: tl =>
              let
-               val grid = ParseGrid.make (canvasWidth, canvasHeight)
+               val maxSide = Int.max (canvasWidth, canvasHeight)
+               val tree = LayerTree.init maxSide
+               val (tokens, tree) = parseLayers
+                 (tl, canvasWidth, canvasHeight, tree, 1)
              in
-               case parseItems (tl, grid) of
-                 SOME (tokens, grid) =>
-                   (case tokens of
-                      [T.R_BRACE] => SOME (canvasWidth, canvasHeight, grid)
-                    | _ => NONE)
-               | NONE => NONE
+               case tokens of
+                 [T.R_BRACE] => SOME tree
+               | _ => NONE
              end
          | _ => NONE)
     | NONE => NONE