Add if..then..else

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

(* HCoop Domtool (http://hcoop.sourceforge.net/)
 * Copyright (c) 2006, Adam Chlipala
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *)

(* Parser for Domtool configuration files *)

open Ast

%%
%header (functor DomtoolLrValsFn(structure Token : TOKEN))

%term 
   EOF
 | SYMBOL of string | CSYMBOL of string
 | STRING of string | DOC of string
 | INT of int
 | ARROW | DARROW | LARROW
 | COLON | CARET | BANG | AND
 | LPAREN | RPAREN | LBRACK | RBRACK | LBRACE | RBRACE
 | EQ | COMMA | BSLASH | BSLASHBSLASH | SEMI | LET | IN | BEGIN | END
 | IF | THEN | ELSE
 | ROOT
 | EXTERN | TYPE | VAL | WITH | WHERE | CONTEXT

%nonterm 
   file of file
 | decls of decl list
 | decl of decl
 | decl' of decl'
 | docOpt of string option
 | expOpt of exp option
 | exp of exp
 | apps of exp
 | term of exp
 | sets of exp list
 | elist of exp list
 | elistNe of exp list
 | clist of exp list
 | typ of typ
 | ctxt of pred
 | recd of record
 | recdNe of record
 | SEMIopt of unit

%verbose                                (* print summary of errors *)
%pos int                                (* positions *)
%start file
%pure
%eop EOF
%noshift EOF

%name Domtool

%right SEMI
%nonassoc COLON
%nonassoc IN
%right ARROW DARROW
%right COMMA
%nonassoc EQ
%right WITH
%right WHERE
%right AND
%nonassoc CARET BANG

%%

file   : docOpt decls expOpt               (docOpt, decls, expOpt)

decls  :                                   ([])
       | decl decls                        (decl :: decls)

decl   : decl' SEMI docOpt                 (decl', docOpt, (decl'left, docOptright))

decl'  : EXTERN TYPE SYMBOL                (DExternType SYMBOL)
       | EXTERN VAL SYMBOL COLON typ       (DExternVal (SYMBOL, typ))
       | VAL SYMBOL EQ exp                 (DVal (SYMBOL, NONE, exp))
       | VAL SYMBOL COLON typ EQ exp       (DVal (SYMBOL, SOME typ, exp))
       | CONTEXT CSYMBOL                   (DContext CSYMBOL)

docOpt :                                   (NONE)
       | DOC                               (SOME DOC)

expOpt :                                   (NONE)
       | exp                               (SOME (ELocal (exp, (ESkip, (expleft, expright))),
						  (expleft, expright)))


exp    : apps                              (apps)
       | apps WHERE sets END               (ELocal ((ESeq sets, (setsleft, setsright)), apps),
					    (appsleft, ENDright))
       | apps WITH END                     (EWith (apps, (ESkip, (WITHleft, ENDright))),
					    (appsleft, ENDright))
       | apps WITH exp END                 (EWith (apps, exp), (appsleft, ENDright))
       | apps WHERE sets WITH END          (ELocal ((ESeq sets, (setsleft, setsright)),
						    (EWith (apps, (ESkip, (WITHleft, ENDright))),
						     (appsleft, ENDright))),
					    (appsleft, ENDright))
       | apps WHERE sets WITH exp END      (ELocal ((ESeq sets, (setsleft, setsright)),
						    (EWith (apps, exp), (appsleft, ENDright))),
					    (appsleft, ENDright))

       | 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
							     ESeq ls => exp :: ls
							   | _ => [exp1, exp2]
					    in
						(ESeq ls, (exp1left, exp2right))
					    end)
       | exp SEMI                          (exp)
       | 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 SEMIopt           ([(ESet (CSYMBOL, apps), (CSYMBOLleft, appsright))])
       | CSYMBOL EQ apps SEMI sets         ((ESet (CSYMBOL, apps), (CSYMBOLleft, appsright))
					    :: sets)

SEMIopt: SEMI                              ()
       |                                   ()

elist  :                                   ([])
       | elistNe                           (elistNe)

elistNe: exp                               ([exp])
       | exp COMMA elistNe                 (exp :: elistNe)

typ    : SYMBOL                            (TBase SYMBOL, (SYMBOLleft, SYMBOLright))
       | LBRACK typ RBRACK                 (TList typ, (LBRACKleft, RBRACKright))
       | typ ARROW typ                     (TArrow (typ1, typ2), (typleft, typright))
       | LBRACK ctxt RBRACK recd DARROW recd (TAction (ctxt, recd1, recd2), (LBRACKleft, recd2right))
       | LBRACK ctxt RBRACK recd           (TAction (ctxt, recd, StringMap.empty),
					    (LBRACKleft, recdright))
       | LBRACK ctxt RBRACK                (TAction (ctxt, StringMap.empty, StringMap.empty),
					    (LBRACKleft, ctxtright))
       | LPAREN typ RPAREN                 (typ)
       | ctxt DARROW typ                   (TNested (ctxt, typ), (ctxtleft, typright))

recd   : LBRACE RBRACE                     (StringMap.empty)
       | LBRACE recdNe RBRACE              (recdNe)

recdNe : CSYMBOL COLON typ                 (StringMap.insert (StringMap.empty, CSYMBOL, typ))
       | CSYMBOL COLON typ COMMA recdNe    (StringMap.insert (recdNe, CSYMBOL, typ))

ctxt   : ROOT                              (CRoot, (ROOTleft, ROOTright))
       | CSYMBOL                           (CConst CSYMBOL, (CSYMBOLleft, CSYMBOLright))
       | CARET ctxt                        (CPrefix ctxt, (CARETleft, ctxtright))
       | BANG ctxt                         (CNot ctxt, (BANGleft, ctxtright))
       | ctxt AND ctxt                     (CAnd (ctxt1, ctxt2), (ctxt1left, ctxt2right))
       | LPAREN ctxt RPAREN                (ctxt)