35 lines
536 B
OCaml
35 lines
536 B
OCaml
%{
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open Ast
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%}
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%token <int> INT
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%token <float> DOUBLE
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%token <string> SYM
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%token <string> STR
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%token LPAREN
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%token RPAREN
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%token QUOTE
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%token EOF
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%start <Ast.lisp_val option> prog
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%%
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prog:
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| EOF { None }
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| e = expr { Some e }
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;
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expr:
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| i = INT { LInt i }
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| d = DOUBLE {LDouble d}
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| s = SYM { LSymbol s }
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| s = STR { LString (String.uppercase_ascii s) }
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| LPAREN; l = lisp_list_rest { l }
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| QUOTE; e = expr { LQuoted e}
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;
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lisp_list_rest:
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| RPAREN { LNil }
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| e = expr; lr = lisp_list_rest { LCons (e, lr) }
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;
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