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|
start: (_item | _NL)*
_item: rule
| token
| statement
_rule_or_token: RULE
| TOKEN
rule: RULE rule_params priority? ":" expansions{_rule_or_token} _NL
token: TOKEN priority? ":" expansions{TOKEN} _NL
rule_params: ["{" RULE ("," RULE)* "}"]
priority: "." NUMBER
statement: "%ignore" expansions{TOKEN} _NL -> ignore
| "%import" import_path{_rule_or_token} ["->" _rule_or_token] _NL -> import
| "%import" import_path{_rule_or_token} name_list{_rule_or_token} _NL -> multi_import
| "%declare" TOKEN+ -> declare
!import_path{name}: "."? name ("." name)*
name_list{name}: "(" name ("," name)* ")"
?expansions{name}: alias{name} (_VBAR alias{name})*
?alias{name}: expansion{name} ["->" RULE]
?expansion{name}: expr{name}*
?expr{name}: atom{name} [OP | "~" NUMBER [".." NUMBER]]
?atom{name}: "(" expansions{name} ")"
| "[" expansions{name} "]" -> maybe
| value{name}
?value{name}: STRING ".." STRING -> literal_range
| name
| (REGEXP | STRING) -> literal
| name "{" value{name} ("," value{name})* "}" -> template_usage
_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.INT -> NUMBER
%import common.WS_INLINE
COMMENT: /\s*/ "//" /[^\n]/*
%ignore WS_INLINE
%ignore COMMENT
|
