dfa.icc

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2004
 *
 *  Last modified:
 *     $Date: 2008-02-06 18:48:22 +0100 (Wed, 06 Feb 2008) $ by $Author: schulte $
 *     $Revision: 6102 $
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.org
 *
 *  Permission is hereby granted, free of charge, to any person obtaining
 *  a copy of this software and associated documentation files (the
 *  "Software"), to deal in the Software without restriction, including
 *  without limitation the rights to use, copy, modify, merge, publish,
 *  distribute, sublicense, and/or sell copies of the Software, and to
 *  permit persons to whom the Software is furnished to do so, subject to
 *  the following conditions:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

namespace Gecode {

  class DFA::DFAI : public SharedHandle::Object {
  public:
    unsigned int n_states;
    unsigned int n_symbols;
    unsigned int n_trans;
    int final_fst;
    int final_lst;
    Transition* trans;
    class HashEntry {
    public:
      int symbol;            
      const Transition* fst; 
      const Transition* lst; 
    };
    HashEntry* table;
    int n_log;
    GECODE_INT_EXPORT void fill(void);
    DFAI(unsigned int nt);
    GECODE_INT_EXPORT DFAI(void);
    virtual ~DFAI(void);
    GECODE_INT_EXPORT virtual SharedHandle::Object* copy(void) const;
  };
  
  forceinline
  DFA::DFAI::DFAI(unsigned int nt)
    : trans(nt == 0 ? NULL :
            static_cast<Transition*>(Memory::malloc(sizeof(Transition)*nt))) {}
  
  forceinline
  DFA::DFAI::~DFAI(void) {
    if (n_trans > 0)
      Memory::free(trans);
    Memory::free(table);
  }

  forceinline
  DFA::DFA(void) {}


  forceinline
  DFA::DFA(const DFA& d)
    : SharedHandle(d) {}

  forceinline unsigned int
  DFA::n_states(void) const {
    const DFAI* d = static_cast<DFAI*>(object());
    return (d == NULL) ? 1 : d->n_states;
  }

  forceinline unsigned int
  DFA::n_symbols(void) const {
    const DFAI* d = static_cast<DFAI*>(object());
    return (d == NULL) ? 0 : d->n_symbols;
  }

  forceinline unsigned int
  DFA::n_transitions(void) const {
    const DFAI* d = static_cast<DFAI*>(object());
    return (d == NULL) ? 0 : d->n_trans;
  }

  forceinline int
  DFA::final_fst(void) const {
    const DFAI* d = static_cast<DFAI*>(object());
    return (d == NULL) ? 0 : d->final_fst;
  }

  forceinline int
  DFA::final_lst(void) const {
    const DFAI* d = static_cast<DFAI*>(object());
    return (d == NULL) ? 0 : d->final_lst;
  }

  forceinline int
  DFA::symbol_min(void) const {
    const DFAI* d = static_cast<DFAI*>(object());
    return ((d != NULL) && (d->n_trans > 0)) ? 
      d->trans[0].symbol : Int::Limits::min;
  }

  forceinline int
  DFA::symbol_max(void) const {
    const DFAI* d = static_cast<DFAI*>(object());
    return ((d != NULL) && (d->n_trans > 0)) ? 
      d->trans[d->n_trans-1].symbol : Int::Limits::max;
  }



  /*
   * Iterating over all transitions
   *
   */

  forceinline
  DFA::Transitions::Transitions(const DFA& d) {
    const DFAI* o = static_cast<DFAI*>(d.object());
    if (o != NULL) {
      c_trans = &o->trans[0];
      e_trans = c_trans+o->n_trans;
    } else {
      c_trans = e_trans = NULL;
    }
  }

  forceinline
  DFA::Transitions::Transitions(const DFA& d, int n) {
    const DFAI* o = static_cast<DFAI*>(d.object());
    if (o != NULL) {
      int mask = (1<<o->n_log)-1;
      int p = n & mask;
      while ((o->table[p].fst != NULL) && (o->table[p].symbol != n))
        p = (p+1) & mask;
      c_trans = o->table[p].fst;
      e_trans = o->table[p].lst;
    } else {
      c_trans = e_trans = NULL;
    }
  }

  forceinline bool
  DFA::Transitions::operator()(void) const {
    return c_trans < e_trans;
  }

  forceinline void
  DFA::Transitions::operator++(void) {
    c_trans++;
  }

  forceinline int
  DFA::Transitions::i_state(void) const {
    return c_trans->i_state;
  }

  forceinline int
  DFA::Transitions::symbol(void) const {
    return c_trans->symbol;
  }

  forceinline int
  DFA::Transitions::o_state(void) const {
    return c_trans->o_state;
  }

  /*
   * Iterating over symbols
   *
   */

  forceinline
  DFA::Symbols::Symbols(const DFA& d) {
    const DFAI* o = static_cast<DFAI*>(d.object());
    if (o != NULL) {
      c_trans = &o->trans[0];
      e_trans = c_trans+o->n_trans;
    } else {
      c_trans = e_trans = NULL;
    }
  }

  forceinline bool
  DFA::Symbols::operator()(void) const {
    return c_trans < e_trans;
  }

  forceinline void
  DFA::Symbols::operator++(void) {
    int s = c_trans->symbol;
    do {
      c_trans++;
    } while ((c_trans < e_trans) && (s == c_trans->symbol));
  }

  forceinline int
  DFA::Symbols::val(void) const {
    return c_trans->symbol;
  }

}


// STATISTICS: int-prop