dotscape/fcore/parser/parser.md

# 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`.
begin parser to load from file 2025-07-12 02:02:21 +01:00			`# Parsing`

			`The parsing functionality is for saving and loading from a custom file format.`

			`The BNF for the custom file format is below.`

change BNF (but not implementation of BNF) for parsing, to handle layers, and also change minimum key in layer tree to be 1 2025-08-09 11:10:34 +01:00			Terminals are surrounded by `**` to the left and right. (rule)+ means "1 or more".
begin parser to load from file 2025-07-12 02:02:21 +01:00
			```
			`int ::= (0-9)+`

			`item ::= { int int int int int int int int }`

reimplement parsing code (but program does not compile yet because I have to change type of 'USE_SQUARES' constructure) 2025-08-09 11:29:36 +01:00			`layer ::= [ item ]`
change BNF (but not implementation of BNF) for parsing, to handle layers, and also change minimum key in layer tree to be 1 2025-08-09 11:10:34 +01:00
reimplement parsing code (but program does not compile yet because I have to change type of 'USE_SQUARES' constructure) 2025-08-09 11:29:36 +01:00			`layer_tree ::= int int { (layer)* }`
begin parser to load from file 2025-07-12 02:02:21 +01:00			```

progress towards saving export string in correct format (but note there is currently an exception somewhere because of changes; need to fix) 2025-08-09 11:56:18 +01:00			The first two `int`s in the `layer_tree` always follow the order: `canvasWidth canvasHeight`.
done with parsing logic in functional core 2025-07-12 03:08:05 +01:00
progress towards saving export string in correct format (but note there is currently an exception somewhere because of changes; need to fix) 2025-08-09 11:56:18 +01:00			The large number of `int`s in the `item` always follow the order: `x y ex ey r g b a`.