start: decl*

decl: iface
	| node

iface: IFACE IDENT "{" iface_field (COMMA iface_field)? COMMA? "}"
iface_field: IDENT COLON IDENT

node: NODE IDENT COLON IDENT "{" variant* "}"
variant: prod "=>" "{" equation_* "}"
prod: sym*
sym: sym_rename
	| STRING
sym_rename: "<" IDENT ":" node_ref ">"
node_ref: IDENT
	| STRING
equation_: equation SEMI
equation: expr EQ expr

expr: expr_dot
	| expr_add
	| expr_mul
	| expr_call
	| IDENT
expr_dot: expr DOT expr
expr_add: expr ADD expr
expr_mul: expr MUL expr
expr_call: expr LPAR args RPAR
args: expr (COMMA expr)? COMMA?

IDENT: /([a-zA-Z][a-zA-Z0-9_]*)|(_[a-zA-Z0-9_]+)/
IFACE: "iface"
NODE: "node"
LANG: "<"
RANG: ">"
ADD: "+"
MUL: "*"
COMMA: ","
COLON: ":"
LPAR: "("
RPAR: ")"
EQ: "="
DOT: "."
SEMI: ";"
THICCARROW: "=>"

%import python.STRING
%import common.WS
%ignore WS