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/***************************************************************************
* Copyright (C) 2004 by Thomas Nagy *
* tnagy2^8@yahoo.fr *
* *
* 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. *
***************************************************************************/
/* File parser.mly */
%{
open Chemset
(*let parse_error somestring = Printf.printf "%s \n" somestring;;
*)
%}
%token <int> INT
%token PLUS MINUS
%token LPAREN RPAREN LBRACKET RBRACKET
%token EOF
%token <string> CAPITAL
%token <string> MINOR
%token ARROW
%start main
%type <Chemset.listitems> main
%%
main:
equation EOF { $1 }
;
equation:
expr ARROW expr { chem_negate $3; List.append $1 $3 }
;
expr:
item { $1::[] }
| item PLUS expr { $1::$3 }
;
item:
MINOR symbols { {ikey=$1; itbl=$2; sign=1} }
| INT symbols { {ikey=string_of_int($1); itbl=$2; sign=1} }
;
symbols:
qte { $1 }
| qte symbols { chem_add $1 $2 }
;
qte:
element INT { createchem $1 $2 }
| element { createchem $1 1 }
| LPAREN symbols RPAREN INT { chem_mult $2 $4 }
| LBRACKET INT PLUS RBRACKET { createchem "+" $2 }
| LBRACKET INT MINUS RBRACKET { createchem "-" $2 }
| LBRACKET PLUS RBRACKET { createchem "+" 1 }
| LBRACKET MINUS RBRACKET { createchem "-" 1 }
;
element:
CAPITAL MINOR { $1 ^ $2 }
| CAPITAL { $1 }
;
|
