lily/language.grammar

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token whitespace = /[ \n\t]+/ [ skip ];
token upper_identifier = /[A-Z_][a-z_A-Z0-9]*/;
token lower_identifier = /[a-z_][a-z_A-Z0-9]*/;
token kw_data = /data/;
token kw_type = /type/;
token kw_defn = /defn/;
token tkn_ocurly = /{/;
token tkn_ccurly = /}/;
token tkn_oparen = /\(/;
token tkn_cparen = /\)/;
token tkn_eq = /=/;
token tkn_comma = /,/;
rule S = program;
rule program
= definition program?
;
rule definition
= kw_data upper_identifier tkn_eq data_body
| kw_type upper_identifier tkn_eq type_body
| kw_defn lower_identifier params? tkn_eq defn_body
;
rule data_body
= tkn_ocurly data_elems tkn_ccurly
;
rule data_elems
= data_elem
| data_elem tkn_comma data_elems
;
rule data_elem
= upper_identifier
| upper_identifier tkn_oparen data_elem_types tkn_cparen
;
rule data_elem_types
= type
| type tkn_comma data_elem_types
;
rule type_body
= tkn_ocurly type tkn_ccurly
;
rule params
= lower_identifier params?
;
rule defn_body
= tkn_ocurly expr tkn_ccurly
;
rule expr
= lower_identifier
;
rule type
= upper_identifier
;