mirror of https://github.com/lark-parser/lark.git
50 lines
980 B
Plaintext
50 lines
980 B
Plaintext
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start: (_item | _NL)*
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_item: rule
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| token
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| statement
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rule: RULE priority? ":" expansions _NL
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token: TOKEN priority? ":" expansions _NL
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priority: "." NUMBER
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statement: "%ignore" expansions _NL -> ignore
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| "%import" import_args ["->" TOKEN] _NL -> import
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import_args: name ("." name)*
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?expansions: alias (_VBAR alias)*
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?alias: expansion ["->" RULE]
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?expansion: expr*
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?expr: atom [OP | "~" NUMBER [".." NUMBER]]
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?atom: "(" expansions ")"
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| "[" expansions "]" -> maybe
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| STRING ".." STRING -> literal_range
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| name
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| (REGEXP | STRING) -> literal
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name: RULE
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| TOKEN
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_VBAR: _NL? "|"
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OP: /[+*][?]?|[?](?![a-z])/
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RULE: /!?[_?]?[a-z][_a-z0-9]*/
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TOKEN: /_?[A-Z][_A-Z0-9]*/
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STRING: _STRING "i"?
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REGEXP: /\/(?!\/)(\\\/|\\\\|[^\/\n])*?\/[imslux]*/
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_NL: /(\r?\n)+\s*/
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%import common.ESCAPED_STRING -> _STRING
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%import common.INT -> NUMBER
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%import common.WS_INLINE
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COMMENT: "//" /[^\n]/*
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%ignore WS_INLINE
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%ignore COMMENT
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