136 lines
2.4 KiB
Plaintext
136 lines
2.4 KiB
Plaintext
token whitespace = /[ \n\t]+/ [ skip ];
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token upper_identifier = /[A-Z_][a-z_A-Z0-9]*/;
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token lower_identifier = /[a-z_][a-z_A-Z0-9]*/;
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token number = /[0-9]+/;
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token kw_data = /data/;
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token kw_type = /type/;
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token kw_defn = /defn/;
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token kw_let = /let/;
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token kw_letrec = /letrec/;
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token kw_in = /in/;
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token kw_case = /case/;
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token kw_of = /of/;
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token tkn_ocurly = /{/;
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token tkn_ccurly = /}/;
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token tkn_oparen = /\(/;
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token tkn_cparen = /\)/;
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token tkn_eq = /=/;
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token tkn_comma = /,/;
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token tkn_arrow = /->/;
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token op_add = /\+/;
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token op_sub = /-/;
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token op_mul = /\*/;
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token op_div = /\//;
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rule S = program;
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rule program
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= definition program?
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;
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rule definition
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= kw_data upper_identifier tkn_eq data_body
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| kw_type upper_identifier tkn_eq type_body
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| kw_defn lower_identifier params? tkn_eq defn_body
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;
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rule data_body
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= tkn_ocurly data_elems tkn_ccurly
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;
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rule data_elems
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= data_elem
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| data_elem tkn_comma data_elems
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;
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rule data_elem
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= upper_identifier
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| upper_identifier tkn_oparen data_elem_types tkn_cparen
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;
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rule data_elem_types
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= type
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| type tkn_comma data_elem_types
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;
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rule type_body
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= tkn_ocurly type tkn_ccurly
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;
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rule params
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= lower_identifier params?
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;
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rule defn_body
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= tkn_ocurly expr tkn_ccurly
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;
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rule expr
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= expr_add
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| expr_let
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| expr_letrec
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| expr_case
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;
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rule expr_add
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= expr_add op_add expr_mul
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| expr_add op_sub expr_mul
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| expr_mul
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;
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rule expr_mul
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= expr_mul op_mul expr_app
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| expr_mul op_div expr_app
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| expr_app
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;
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rule expr_app
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= expr_app? expr_app_bottom
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;
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rule expr_app_bottom
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= lower_identifier
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| upper_identifier
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| number
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| tkn_oparen expr tkn_cparen
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;
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rule expr_curly
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= tkn_ocurly expr tkn_ccurly
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;
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rule expr_let
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= kw_let lower_identifier tkn_eq expr_curly kw_in expr_curly
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;
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rule expr_letrec
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= kw_letrec lower_identifier tkn_eq expr_curly kw_in expr_curly
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;
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rule expr_case
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= kw_case expr kw_of tkn_ocurly expr_case_branches tkn_ccurly
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;
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rule expr_case_branches
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= expr_case_branch expr_case_branches?
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;
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rule expr_case_branch
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= pattern tkn_arrow expr_curly
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;
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rule pattern
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= lower_identifier
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| upper_identifier
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| upper_identifier tkn_oparen patterns tkn_cparen
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;
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rule patterns
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= lower_identifier
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| lower_identifier tkn_comma patterns
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;
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rule type
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= upper_identifier
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;
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