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|
%{
open Ast
%}
// The start token becomes a parser function in the compiled code:
%start start
// These are the terminal tokens of the grammar along with the types of
// the data carried by each token:
%token <System.Int32> INT32
%token <System.Double> FLOAT
%token PLUS MINUS ASTER SLASH
%token LPAREN RPAREN
%token EOF
// This is the type of the data produced by a successful reduction of the 'start'
// symbol:
%type < Ast.Equation > start
%%
// These are the rules of the grammar along with the F# code of the
// actions executed as rules are reduced. In this case the actions
// produce data using F# data construction terms.
start: Prog { Equation($1) }
Prog:
| Expr EOF { $1 }
Expr:
| Expr PLUS Term { Plus($1, $3) }
| Expr MINUS Term { Minus($1, $3) }
| Term { Term($1) }
Term:
| Term ASTER Factor { Times($1, $3) }
| Term SLASH Factor { Divide($1, $3) }
| Factor { Factor($1) }
Factor:
| FLOAT { Float($1) }
| INT32 { Integer($1) }
| LPAREN Expr RPAREN { ParenEx($2) }
|
