X-Git-Url: http://git.joshuawise.com/snipe.git/blobdiff_plain/12aa4087bee3e70f170d7457794921de4e385227..0a24e44d4e9f82f8d3d83de8e58c83c8cf2868b6:/parse/l1.grm

diff --git a/parse/l1.grm b/parse/l1.grm
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-(* L1 Compiler
- * L1 grammar
- * Author: Kaustuv Chaudhuri <kaustuv+@cs.cmu.edu>
- * Modified: Frank Pfenning <fp@cs.cmu.edu>
- *)
-
-structure A = Ast
-
-(* for simplicity, we only mark expressions, not statements *)
-
-(* mark e with region (left, right) in source file *)
-fun mark (e, (left, right)) = A.Marked (Mark.mark' (e, ParseState.ext (left, right)))
-
-(* create lval from expression; here just an id *)
-(* generates error if not an identifier *)
-fun make_lval (A.Var(id)) ext = id
-  | make_lval (A.Marked(marked_exp)) ext =
-      make_lval (Mark.data marked_exp) (Mark.ext marked_exp)
-  | make_lval _ ext = ( ErrorMsg.error ext "not a variable" ;
-			Symbol.bogus )
-
-(* expand_asnop (exp1, "op=", exp2) region = "exp1 = exp1 op exps"
- * or = "exp1 = exp2" if asnop is "="
- * generates error if exp1 is an lval (identifier)
- * syntactically expands a compound assignment operator
- *)
-fun expand_asnop (exp1, NONE, exp2) (left, right) =
-      A.Assign(make_lval exp1 NONE, exp2)
-  | expand_asnop (exp1, SOME(oper), exp2) (left, right) =
-      A.Assign(make_lval exp1 NONE,
-	       mark(A.OpExp(oper, [exp1, exp2]), (left, right)))
-
-%%
-%header (functor L1LrValsFn (structure Token : TOKEN))
-
-%term 
-   EOF
- | SEMI
- | INTNUM of Word32.word
- | IDENT of Symbol.symbol
- | RETURN
- | PLUS | MINUS | STAR | SLASH | PERCENT
- | ASSIGN | PLUSEQ | MINUSEQ | STAREQ | SLASHEQ | PERCENTEQ
- | LBRACE | RBRACE
- | LPAREN | RPAREN
- | UNARY | ASNOP (* dummy *)
-
-%nonterm 
-   program of A.program
- | stms of A.stm list
- | stm of A.stm
- | simp of A.stm
- | return of A.stm
- | exp of A.exp
- | asnop of A.oper option
-
-%verbose                                (* print summary of errors *)
-%pos int                                (* positions *)
-%start program
-%eop EOF
-%noshift EOF
-
-%name L1
-
-%left PLUS MINUS
-%left STAR SLASH PERCENT
-%right UNARY
-%left LPAREN
-
-%%
-
-program    : LBRACE stms return RBRACE
-                                   (stms@[return])
-
-return     : RETURN exp SEMI       (A.Return exp)
-
-stms       :                       ([])
-           | stm stms              (stm :: stms)
-
-stm        : simp SEMI             (simp)
-simp       : exp asnop exp %prec ASNOP
-                                   (expand_asnop (exp1, asnop, exp2) (exp1left, exp2right))
-
-exp        : LPAREN exp RPAREN     (exp)
-           | INTNUM                (mark (A.ConstExp(INTNUM),(INTNUMleft,INTNUMright)))
-           | IDENT                 (mark (A.Var(IDENT), (IDENTleft,IDENTright)))
-           | exp PLUS exp          (mark (A.OpExp (A.PLUS, [exp1,exp2]), (exp1left,exp2right)))
-           | exp MINUS exp         (mark (A.OpExp (A.MINUS, [exp1,exp2]), (exp1left,exp2right)))
-           | exp STAR exp          (mark (A.OpExp (A.TIMES, [exp1,exp2]), (exp1left,exp2right)))
-           | exp SLASH exp         (mark (A.OpExp (A.DIVIDEDBY, [exp1,exp2]), (exp1left,exp2right)))
-           | exp PERCENT exp       (mark (A.OpExp (A.MODULO, [exp1,exp2]), (exp1left,exp2right)))
-           | MINUS exp %prec UNARY (mark (A.OpExp (A.NEGATIVE, [exp]), (MINUSleft,expright)))
-
-asnop      : ASSIGN                (NONE)
-           | PLUSEQ                (SOME(A.PLUS))
-           | MINUSEQ               (SOME(A.MINUS))
-           | STAREQ                (SOME(A.TIMES))
-           | SLASHEQ               (SOME(A.DIVIDEDBY))
-           | PERCENTEQ             (SOME(A.MODULO))