51 lines
1.6 KiB
Plaintext
51 lines
1.6 KiB
Plaintext
%{
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open FSharp.Text.Parsing
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%}
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%token <int> INT
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%token <string> VAR
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%token LPAR RPAR EQ
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// FIXME: You should declare tokens for:
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// + Operators
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// + Keywords
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// The token for identifier (variable name) is
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// already provided ('VAR')
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%token LET IN TO OF EOF
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%token TIMES
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%token PLUS MINUS
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%token SUM PROD MAX ARGMAX
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// FIXME: Add precedence rules here.
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%nonassoc letprec overprec
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%left TIMES
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%left PLUS MINUS
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%start Prog
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%type <AbSyn.EXP> Prog
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%type <AbSyn.EXP> Exp
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%%
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Prog : Exp EOF { $1 }
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;
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Exp : INT { AbSyn.CONSTANT (AbSyn.INT $1) }
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| VAR { AbSyn.VARIABLE $1 }
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| LPAR Exp RPAR { $2 }
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| Exp PLUS Exp { AbSyn.OPERATE (AbSyn.BPLUS, $1, $3) }
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| Exp MINUS Exp { AbSyn.OPERATE (AbSyn.BMINUS, $1, $3) }
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| Exp TIMES Exp { AbSyn.OPERATE (AbSyn.BTIMES, $1, $3) }
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| LET VAR EQ Exp IN Exp %prec letprec { AbSyn.LET_IN ($2, $4, $6) }
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| SUM VAR EQ Exp TO Exp OF Exp %prec overprec { AbSyn.OVER (AbSyn.RSUM, $2, $4, $6, $8) }
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| PROD VAR EQ Exp TO Exp OF Exp %prec overprec { AbSyn.OVER (AbSyn.RPROD, $2, $4, $6, $8) }
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| MAX VAR EQ Exp TO Exp OF Exp %prec overprec { AbSyn.OVER (AbSyn.RMAX, $2, $4, $6, $8) }
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| ARGMAX VAR EQ Exp TO Exp OF Exp %prec overprec { AbSyn.OVER (AbSyn.RARGMAX, $2, $4, $6, $8) }
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// FIXME: You should implement parsing for:
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// + infix opeators
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// + let ... = ... in ...
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// + sum ... = ... to ... of ... [and likewise for prod, ...]
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;
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%%
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