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|
start: (_item? _NL)* _item?
_item: rule
| token
| statement
rule: RULE rule_params priority? ":" expansions
token: TOKEN token_params priority? ":" expansions
rule_params: ["{" RULE ("," RULE)* "}"]
token_params: ["{" TOKEN ("," TOKEN)* "}"]
priority: "." NUMBER
statement: "%ignore" expansions -> ignore
| "%import" import_path ["->" name] -> import
| "%import" import_path name_list -> multi_import
| "%declare" name+ -> declare
!import_path: "."? name ("." name)*
name_list: "(" name ("," name)* ")"
?expansions: alias (_VBAR alias)*
?alias: expansion ["->" RULE]
?expansion: expr*
?expr: atom [OP | "~" NUMBER [".." NUMBER]]
?atom: "(" expansions ")"
| "[" expansions "]" -> maybe
| value
?value: STRING ".." STRING -> literal_range
| name
| (REGEXP | STRING) -> literal
| name "{" value ("," value)* "}" -> template_usage
name: RULE
| TOKEN
_VBAR: _NL? "|"
OP: /[+*]|[?](?![a-z])/
RULE: /!?[_?]?[a-z][_a-z0-9]*/
TOKEN: /_?[A-Z][_A-Z0-9]*/
STRING: _STRING "i"?
REGEXP: /\/(?!\/)(\\\/|\\\\|[^\/\n])*?\/[imslux]*/
_NL: /(\r?\n)+\s*/
%import common.ESCAPED_STRING -> _STRING
%import common.SIGNED_INT -> NUMBER
%import common.WS_INLINE
COMMENT: /\s*/ "//" /[^\n]/*
%ignore WS_INLINE
%ignore COMMENT
|
