program: decl*

?decl: iface
	| node

sep_trail{item, punc}: item (punc item)? punc?

iface: "iface" ident "{" sep_trail{iface_field, ","} "}"
iface_field: ident ":" ident

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

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

ident: IDENT
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