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/*=============================================================================*\
* File: gfsmSemiring.c
* Author: Bryan Jurish <moocow@ling.uni-potsdam.de>
* Description: finite state machine library
*
* Copyright (c) 2004-2007 Bryan Jurish.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*=============================================================================*/
#include <gfsmSemiring.h>
//-- no-inline definitions
#ifndef GFSM_INLINE_ENABLED
# include <gfsmSemiring.hi>
#endif
/*======================================================================
* Semiring: methods: constructors etc.
*/
/*======================================================================
* Semiring: methods: general accessors
*/
/*--------------------------------------------------------------
* compare()
*/
gint gfsm_sr_compare(gfsmSemiring *sr, gfsmWeight x, gfsmWeight y)
{
switch (sr->type) {
case gfsmSRTLog:
case gfsmSRTTropical: return (x < y ? -1 : (x > y ? 1 : 0));
case gfsmSRTTrivial: return 0;
case gfsmSRTPLog: return (x < y ? 1 : (x > y ? -1 : 0));
case gfsmSRTUser:
return (gfsm_sr_compare(sr,x,y) ? -1 : (gfsm_sr_compare(sr,y,x) ? 1 : 0));
if (((gfsmUserSemiring*)sr)->less_func) {
if ((*((gfsmUserSemiring*)sr)->less_func)(sr,x,y)) return -1;
if ((*((gfsmUserSemiring*)sr)->less_func)(sr,y,x)) return 1;
return 0;
}
case gfsmSRTBoolean:
case gfsmSRTReal:
default: return (x > y ? -1 : (x < y ? 1 : 0));
}
return 0; //-- should never happen
}
/*======================================================================
* Semiring: string utilities
*/
/*--------------------------------------------------------------
* name_to_type()
*/
gfsmSRType gfsm_sr_name_to_type(const char *name)
{
if (strcmp(name,"boolean") ==0) return gfsmSRTBoolean;
else if (strcmp(name,"log") ==0) return gfsmSRTLog;
else if (strcmp(name,"plog") ==0) return gfsmSRTPLog;
else if (strcmp(name,"real") ==0) return gfsmSRTReal;
else if (strcmp(name,"trivial") ==0) return gfsmSRTTrivial;
else if (strcmp(name,"tropical") ==0) return gfsmSRTTropical;
else if (strcmp(name,"user") ==0) return gfsmSRTUser;
return gfsmSRTUnknown;
}
/*--------------------------------------------------------------
* type_to_name()
*/
gchar *gfsm_sr_type_to_name(gfsmSRType type)
{
switch (type) {
case gfsmSRTBoolean: return "boolean";
case gfsmSRTLog: return "log";
case gfsmSRTPLog: return "plog";
case gfsmSRTTrivial: return "trivial";
case gfsmSRTTropical: return "tropical";
case gfsmSRTReal: return "real";
default: return "unknown";
}
}
/*======================================================================
* Semiring: general utilities
*/
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