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yap-6.3/packages/http/http_error.c

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2010-06-23 11:52:34 +01:00
/* $Id$
Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: wielemak@science.uva.nl
WWW: http://www.swi-prolog.org
Copyright (C): 2007, University of Amsterdam
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 <SWI-Stream.h>
#include <SWI-Prolog.h>
#define O_DEBUG 1
static functor_t FUNCTOR_error2; /* error(Formal, Context) */
static functor_t FUNCTOR_type_error2; /* type_error(Term, Expected) */
static functor_t FUNCTOR_domain_error2; /* domain_error(Term, Expected) */
static functor_t FUNCTOR_permission_error3; /* permission_error(Op, Type, Term) */
static functor_t FUNCTOR_existence_error2; /* existence_error(Type, Term) */
static int debuglevel = 0;
#define MKFUNCTOR(name, arity) PL_new_functor(PL_new_atom(name), arity)
#ifdef O_DEBUG
#define DEBUG(n, g) if ( debuglevel >= n ) g
#else
#define DEBUG(n, g) (void)0
#endif
#ifdef O_DEBUG
static foreign_t
http_stream_debug(term_t level)
{ return PL_get_integer(level, &debuglevel);
}
#endif
/*******************************
* ERRORS *
*******************************/
static int
type_error(term_t actual, const char *expected)
{ term_t ex;
if ( (ex = PL_new_term_ref()) &&
PL_unify_term(ex,
PL_FUNCTOR, FUNCTOR_error2,
PL_FUNCTOR, FUNCTOR_type_error2,
PL_CHARS, expected,
PL_TERM, actual,
PL_VARIABLE) )
return PL_raise_exception(ex);
return FALSE;
}
static int
domain_error(term_t actual, const char *domain)
{ term_t ex;
if ( (ex = PL_new_term_ref()) &&
PL_unify_term(ex,
PL_FUNCTOR, FUNCTOR_error2,
PL_FUNCTOR, FUNCTOR_domain_error2,
PL_CHARS, domain,
PL_TERM, actual,
PL_VARIABLE) )
return PL_raise_exception(ex);
return FALSE;
}
static int
existence_error(term_t actual, const char *type)
{ term_t ex;
if ( (ex = PL_new_term_ref()) &&
PL_unify_term(ex,
PL_FUNCTOR, FUNCTOR_error2,
PL_FUNCTOR, FUNCTOR_existence_error2,
PL_CHARS, type,
PL_TERM, actual,
PL_VARIABLE) )
return PL_raise_exception(ex);
return FALSE;
}
static int
permission_error(const char *op, const char *objtype, term_t obj)
{ term_t ex;
if ( (ex = PL_new_term_ref()) &&
PL_unify_term(ex,
PL_FUNCTOR, FUNCTOR_error2,
PL_FUNCTOR, FUNCTOR_permission_error3,
PL_CHARS, op,
PL_CHARS, objtype,
PL_TERM, obj,
PL_VARIABLE) )
return PL_raise_exception(ex);
return FALSE;
}
static int
instantiation_error()
{ term_t ex;
if ( (ex = PL_new_term_ref()) &&
PL_unify_term(ex,
PL_FUNCTOR, FUNCTOR_error2,
PL_CHARS, "instantiation_error",
PL_VARIABLE) )
return PL_raise_exception(ex);
return FALSE;
}
static int
get_int_ex(term_t t, int *i)
{ if ( PL_get_integer(t, i) )
return TRUE;
return type_error(t, "integer");
}
static int
get_bool_ex(term_t t, int *i)
{ if ( PL_get_bool(t, i) )
return TRUE;
return type_error(t, "boolean");
}
static void
init_errors()
{ FUNCTOR_error2 = MKFUNCTOR("error", 2);
FUNCTOR_type_error2 = MKFUNCTOR("type_error", 2);
FUNCTOR_domain_error2 = MKFUNCTOR("domain_error", 2);
FUNCTOR_existence_error2 = MKFUNCTOR("existence_error", 2);
FUNCTOR_permission_error3 = MKFUNCTOR("permission_error", 3);
#ifdef O_DEBUG
PL_register_foreign("http_stream_debug", 1, http_stream_debug, 0);
#endif
}