Add if..then..else

[hcoop/domtool2.git] / src / domtool.grm

diff --git a/src/domtool.grm b/src/domtool.grm
index 549a183..c9cd837 100644 (file)
--- a/src/domtool.grm
+++ b/src/domtool.grm
@@ -31,7 +31,8 @@ open Ast
  | ARROW | DARROW | LARROW
  | COLON | CARET | BANG | AND
  | LPAREN | RPAREN | LBRACK | RBRACK | LBRACE | RBRACE
- | EQ | COMMA | BSLASH | SEMI | LET | IN | END
+ | EQ | COMMA | BSLASH | BSLASHBSLASH | SEMI | LET | IN | BEGIN | END
+ | IF | THEN | ELSE
  | ROOT
  | EXTERN | TYPE | VAL | WITH | WHERE | CONTEXT
 
@@ -53,6 +54,7 @@ open Ast
  | ctxt of pred
  | recd of record
  | recdNe of record
+ | SEMIopt of unit
 
 %verbose                                (* print summary of errors *)
 %pos int                                (* positions *)
@@ -114,6 +116,8 @@ exp    : apps                              (apps)
        | BSLASH SYMBOL COLON LPAREN typ RPAREN ARROW exp (ELam (SYMBOL, SOME typ, exp),
                                                          (BSLASHleft, expright))
        | BSLASH SYMBOL ARROW exp           (ELam (SYMBOL, NONE, exp), (BSLASHleft, expright))
+       | BSLASHBSLASH SYMBOL COLON ctxt ARROW exp (EALam (SYMBOL, ctxt, exp),
+                                                         (BSLASHBSLASHleft, expright))
        | CSYMBOL EQ exp                    (ESet (CSYMBOL, exp), (CSYMBOLleft, expright))
        | exp SEMI exp                      (let
                                                val ls = case #1 exp2 of
@@ -123,22 +127,28 @@ exp    : apps                              (apps)
                                                (ESeq ls, (exp1left, exp2right))
                                            end)
        | exp SEMI                          (exp)
-       | SYMBOL LARROW CSYMBOL SEMI exp    (EGet (SYMBOL, CSYMBOL, exp), (SYMBOLleft, expright))
+       | SYMBOL LARROW CSYMBOL SEMI exp    (EGet (SYMBOL, NONE, CSYMBOL, exp), (SYMBOLleft, expright))
+       | SYMBOL COLON typ LARROW CSYMBOL SEMI exp (EGet (SYMBOL, SOME typ, CSYMBOL, exp), (SYMBOLleft, expright))
+       | IF exp THEN exp ELSE exp          (EIf (exp1, exp2, exp3), (IFleft, exp3right))
 
 apps   : term                              (term)
        | apps term                         (EApp (apps, term), (appsleft, termright))
 
 term   : LPAREN exp RPAREN                 (exp)
+       | BEGIN exp END                     (exp)
        | INT                               (EInt INT, (INTleft, INTright))
        | STRING                            (EString STRING, (STRINGleft, STRINGright))
        | LBRACK elist RBRACK               (EList elist, (LBRACKleft, RBRACKright))
        | LET exp IN exp END                (ELocal (exp1, exp2), (LETleft, ENDright))
        | SYMBOL                            (EVar SYMBOL, (SYMBOLleft, SYMBOLright))
 
-sets   : CSYMBOL EQ apps                   ([(ESet (CSYMBOL, apps), (CSYMBOLleft, appsright))])
+sets   : CSYMBOL EQ apps SEMIopt           ([(ESet (CSYMBOL, apps), (CSYMBOLleft, appsright))])
        | CSYMBOL EQ apps SEMI sets         ((ESet (CSYMBOL, apps), (CSYMBOLleft, appsright))
                                            :: sets)
 
+SEMIopt: SEMI                              ()
+       |                                   ()
+
 elist  :                                   ([])
        | elistNe                           (elistNe)