(* Copyright (C) 2000, HELM Team.
 * 
 * This file is part of HELM, an Hypertextual, Electronic
 * Library of Mathematics, developed at the Computer Science
 * Department, University of Bologna, Italy.
 * 
 * HELM 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.
 * 
 * HELM 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 HELM; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA  02111-1307, USA.
 * 
 * For details, see the HELM World-Wide-Web page,
 * http://cs.unibo.it/helm/.
 *)

(******************************************************************************)
(*                                                                            *)
(*                               PROJECT HELM                                 *)
(*                                                                            *)
(*                     Ferruccio Guidi <fguidi@cs.unibo.it>                   *)
(*                                 23/05/2002                                 *)
(*                                                                            *)
(*                                                                            *)
(******************************************************************************)

{ 
   open MQueryTParser
}

let SPC   = [' ' '\t' '\n']+
let ALPHA = ['A'-'Z' 'a'-'z']
let NUM   = ['0'-'9']
let IDEN  = ALPHA (NUM | ALPHA)*
let DQ    = '"'
let SQ    = '''
let QSTR  = [^ ''']*
let USTR  = [^ '"' ':' '/' '#' '?' '*']+

rule rtoken = parse
   | DQ               { DQT   }
   | ":/"             { PROT  }
   | "/"              { SLASH }
   | "#1"             { FRAG  }
   | "?"              { QUEST }
   | "**"             { SSTAR }
   | "*"              { STAR  }
   | USTR             { STR (Lexing.lexeme lexbuf) }
and stoken = parse
   | SQ               { SQT   }
   | QSTR             { STR (Lexing.lexeme lexbuf) }
and qtoken = parse
   | SPC              { qtoken lexbuf }
   | '('              { LPR    }
   | ')'              { RPR    }
   | '$'              { DLR    }
   | SQ               { STR (qstr stoken lexbuf) }
   | DQ               { REF (ref rtoken lexbuf) }
   | "name"           { NAME   }
   | "mainconclusion" { MCONCL }
   | "conclusion"     { CONCL  }
   | "true"           { TRUE   }
   | "false"          { FALSE  }
   | "and"            { AND    }
   | "or"             { OR     }
   | "not"            { NOT    }
   | "is"             { IS     }
   | "select"         { SELECT }
   | "in"             { IN     }
   | "where"          { WHERE  }
   | "use"            { USE    }
   | "position"       { POS    }
   | "usedby"         { USEDBY }
   | "pattern"        { PATT   }
   | "union"          { UNION  }
   | "intersect"      { INTER  }
   | IDEN             { ID (Lexing.lexeme lexbuf) }
   | eof              { EOF   }