131 lines
2.6 KiB
Plaintext
131 lines
2.6 KiB
Plaintext
/* milly's Bison grammar */
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%{
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#include <stdio.h>
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int yylex();
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void yyerror(const char *);
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%}
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%token IDENT
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%token PARAM_IDENT
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%token INT STRING
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%token TRUE FALSE
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%token CASE LET IN MATCH OF DEF DATATYPE ALIAS TYPECHECK
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%token ARROW
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/* Function constructor is right associative */
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%right ARROW
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%start program
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%%
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program: decl
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| decl program
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/* Types syntax */
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type: atomic_type
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| type ARROW type
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atomic_type: type_app
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| PARAM_IDENT
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| '(' type ')'
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| '(' type tuple_types ')'
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type_app_atom: PARAM_IDENT
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| '(' type ')'
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| '(' type tuple_types ')'
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| IDENT
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type_app: IDENT
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| type_app_atom type_app
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tuple_types: ',' type
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| tuple_types ',' type
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/* Declaration syntax */
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decl: datatype_decl
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| alias_decl
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| typecheck_decl
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| value_decl
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| func_decl
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datatype_decl: DATATYPE def_type_params IDENT '{' datatype_alts '}'
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/* type parameters of a definition */
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def_type_params: %empty
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| PARAM_IDENT def_type_params
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datatype_alts: %empty
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| IDENT OF type datatype_alts_cont
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| IDENT datatype_alts_cont
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datatype_alts_cont: %empty
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| ',' IDENT type datatype_alts_cont
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| ',' IDENT datatype_alts_cont
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alias_decl: ALIAS def_type_params IDENT '=' type
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typecheck_decl: TYPECHECK IDENT ':' type
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value_decl: DEF IDENT '=' expr
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func_decl: DEF IDENT param_patterns '=' expr fun_alts
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param_patterns: pattern
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| pattern param_patterns
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fun_alts: %empty
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| '|' IDENT param_patterns '=' expr fun_alts
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/* Expressions */
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atomic_expr: IDENT
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| INT
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| TRUE | FALSE
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| STRING
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| '[' list_elems ']'
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| '(' expr ',' expr list_elems_cont ')'
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| '(' expr ')'
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list_elems: %empty
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| expr list_elems_cont
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list_elems_cont: %empty
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| ',' expr list_elems_cont
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fun_app_expr: atomic_expr
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| fun_app_expr atomic_expr
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expr: fun_app_expr
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| MATCH expr '{' case_alts '}'
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| LET let_decls IN expr
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case_alts: %empty
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| CASE pattern ARROW expr case_alts
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let_decls: decl | decl let_decls
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/* Pattern language */
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pattern: IDENT
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| INT
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| TRUE | FALSE
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| STRING
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| '<' IDENT ctor_param_patterns '>'
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| '(' pattern ',' pattern pattern_list_cont ')'
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| '[' pattern_list ']'
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ctor_param_patterns: %empty | param_patterns
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pattern_list: %empty
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| pattern pattern_list_cont
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pattern_list_cont: %empty
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| ',' pattern pattern_list_cont
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%%
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void yyerror(const char *err) {
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fprintf(stderr, "Error: %s", err);
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}
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