61 lines
1.4 KiB
OCaml
61 lines
1.4 KiB
OCaml
%{
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open Ast
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open Ast.Syntax
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%}
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%token <int> Lint
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%token <bool> Lbool
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%token <Ast.type_t> Ltype
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%token <string> Lvar
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%token Lend Lassign Lsc Lreturn
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%token Ladd Lsub Lmul Ldiv
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%left Ladd Lsub Lmul Ldiv
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%start prog
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%type <Ast.Syntax.block> prog
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%%
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prog:
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| Lend { [] }
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| i = instr ; Lsc ; b = prog { i @ b }
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;
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instr:
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| Lreturn ; e = expr { [ Return { expr = e ; pos = $startpos } ] }
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| t = Ltype ; v = Lvar {
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[ Decl { name = v ; type_t = t ; pos = $startpos(t) } ]
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}
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| t = Ltype ; v = Lvar ; Lassign ; e = expr
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{ [ Decl { name = v ; type_t = t ; pos = $startpos(t) }
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; Assign { var = v ; expr = e ; pos = $startpos(v) } ]
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}
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| v = Lvar ; Lassign ; e = expr {
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[ Assign { var = v ; expr = e ; pos = $startpos($2) } ]
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}
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expr:
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| n = Lint {
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Val { value = Int (n) ; pos = $startpos(n) }
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}
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| b = Lbool {
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Val { value = Bool (b) ; pos = $startpos(b) }
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}
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| v = Lvar {
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Var { name = v ; pos = $startpos(v) }
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}
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| a = expr ; Ladd ; b = expr {
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Call { func = "%add" ; args = [ a ; b ] ; pos = $startpos($2) }
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}
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| a = expr ; Lsub ; b = expr {
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Call { func = "%sub" ; args = [ a ; b ] ; pos = $startpos($2) }
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}
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| a = expr ; Lmul ; b = expr {
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Call { func = "%mul" ; args = [ a ; b ] ; pos = $startpos($2) }
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}
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| a = expr ; Ldiv ; b = expr {
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Call { func = "%div" ; args = [ a ; b ] ; pos = $startpos($2) }
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}
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;
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