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84 lines
2.5 KiB
84 lines
2.5 KiB
/***************************************************************************
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* Copyright (C) 2004 by Thomas Nagy *
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* tnagy2^8@yahoo.fr *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
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***************************************************************************/
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/* File parser.mly */
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%{
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open Chemset
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(*let parse_error somestring = Printf.printf "%s \n" somestring;;
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*)
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%}
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%token <int> INT
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%token PLUS MINUS
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%token LPAREN RPAREN LBRACKET RBRACKET
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%token EOF
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%token <string> CAPITAL
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%token <string> MINOR
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%token ARROW
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%start main
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%type <Chemset.listitems> main
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%%
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main:
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equation EOF { $1 }
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;
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equation:
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expr ARROW expr { chem_negate $3; List.append $1 $3 }
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;
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expr:
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item { $1::[] }
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| item PLUS expr { $1::$3 }
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;
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item:
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MINOR symbols { {ikey=$1; itbl=$2; sign=1} }
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| INT symbols { {ikey=string_of_int($1); itbl=$2; sign=1} }
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;
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symbols:
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qte { $1 }
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| qte symbols { chem_add $1 $2 }
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;
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qte:
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element INT { createchem $1 $2 }
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| element { createchem $1 1 }
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| LPAREN symbols RPAREN INT { chem_mult $2 $4 }
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| LBRACKET INT PLUS RBRACKET { createchem "+" $2 }
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| LBRACKET INT MINUS RBRACKET { createchem "-" $2 }
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| LBRACKET PLUS RBRACKET { createchem "+" 1 }
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| LBRACKET MINUS RBRACKET { createchem "-" 1 }
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;
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element:
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CAPITAL MINOR { $1 ^ $2 }
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| CAPITAL { $1 }
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;
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