Add 'dotscape/' from commit 'f306501a68a51b634e895c5fdac70788ae899d75'

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git-subtree-split: f306501a68

dotscape/fcore/parser/parser.md

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+# Parsing
+
+The parsing functionality is for saving and loading from a custom file format.
+
+The BNF for the custom file format is below.
+
+Terminals are surrounded by `**` to the left and right. (rule)+ means "1 or more".
+
+```
+int ::= (0-9)+
+
+item ::= **{** int int int int int int int int **}**
+
+layer ::= **[** item **]**
+
+layer_tree ::= int int **{** (layer)* **}**
+```
+
+The first two `int`s in the `layer_tree` always follow the order: `canvasWidth canvasHeight`.
+
+The large number of `int`s in the `item` always follow the order: `x y ex ey r g b a`.