You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
63 lines
1.5 KiB
Plaintext
63 lines
1.5 KiB
Plaintext
# Lark grammar of Lark's syntax
|
|
# Note: Lark is not bootstrapped, its parser is implemented in load_grammar.py
|
|
|
|
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
|
|
| "%override" rule -> override_rule
|
|
| "%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: /\/(?!\/)(\\\/|\\\\|[^\/])*?\/[imslux]*/
|
|
_NL: /(\r?\n)+\s*/
|
|
|
|
%import common.ESCAPED_STRING -> _STRING
|
|
%import common.SIGNED_INT -> NUMBER
|
|
%import common.WS_INLINE
|
|
|
|
COMMENT: /\s*/ "//" /[^\n]/* | /\s*/ "#" /[^\n]/*
|
|
|
|
%ignore WS_INLINE
|
|
%ignore COMMENT
|