#!@PERL@ -w -I @srcdir@/../../xapian-core/
# @configure_input@
#
# generate-python-exceptions.in: generate error handling code for python
# bindings
#
# Copyright (C) 2003,2004,2006,2007 Olly Betts
# Copyright (C) 2007 Richard Boulton
#
# This program 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.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA

use strict;
use exception_data;

my @allclasses = (@baseclasses, @classes);

open FD, ">except.i" or die $!;

print FD <<"EOF";
/* python/except.i: Custom Python exception handling.
 * Warning: This file is generated by $0
 * - do not modify directly!
 *
 * Copyright 2007 Lemur Consulting Ltd
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */
EOF

print FD <<'EOF';
namespace Xapian {

%exceptionclass Error;
%ignore Error::get_description;
%extend Error {
    std::string __str__() const {
	std::string desc($self->get_msg());
	if (!$self->get_context().empty()) {
	    desc += " (context: ";
	    desc += $self->get_context();
	    desc += ')';
	}
	if ($self->get_error_string()) {
	    desc += " (";
	    desc += $self->get_error_string();
	    desc += ')';
	}
	return desc;
    }
}
EOF

for (@allclasses) {
    my ($class, $parent, $comment) = split /\t/, $_, 3;
    print FD "%exceptionclass $class;\n";
}

print FD <<'EOF';
}
%include "xapian/error.h"

%{
static void XapianSetPythonException() {
    try {
	throw;
    } catch (Swig::DirectorException &e) {
	/* This happens if a director raised an exception.  The original Python
	 * error state should still be set, so we don't need to do anything. */
EOF

for (reverse @allclasses) {
    my ($class, $parent, $comment) = split /\t/, $_, 3;
    print FD <<"EOF";
    } catch (const Xapian::$class &e) {
	SWIG_Python_Raise(SWIG_NewPointerObj((new Xapian::$class(e)),
					     SWIGTYPE_p_Xapian__$class,
					     SWIG_POINTER_OWN),
			  "Xapian::$class",
			  SWIGTYPE_p_Xapian__$class);
EOF
}

print FD <<'EOF';
    } catch (const Xapian::Error &e) {
	SWIG_Python_Raise(SWIG_NewPointerObj((new Xapian::Error(e)),
					     SWIGTYPE_p_Xapian__Error,
					     SWIG_POINTER_OWN),
			  "Xapian::Error",
			  SWIGTYPE_p_Xapian__Error);
    } catch (const std::exception& e) {
        SWIG_Error(SWIG_RuntimeError, e.what());
    } catch (...) {
	SWIG_Error(SWIG_UnknownError, "unknown error in Xapian");
    }
}
%}

/* Note that we have to re-acquire the GIL in the catch() here, because
 * XapianSetPythonException accesses Python datastructures.  */
%exception {
    try {
	$action
    } catch (...) {
	SWIG_PYTHON_THREAD_END_ALLOW;
	XapianSetPythonException();
	SWIG_fail;
    }
}

/* The following exception directives are for the methods defined by
 * director classes, which don't drop the GIL in the first place. */
%exception Xapian::MatchDecider::operator() {
    try {
	$action
    } catch (...) {
	XapianSetPythonException();
	SWIG_fail;
    }
}
%exception Xapian::ExpandDecider::operator() {
    try {
	$action
    } catch (...) {
	XapianSetPythonException();
	SWIG_fail;
    }
}
%exception Xapian::Stopper::operator() {
    try {
	$action
    } catch (...) {
	XapianSetPythonException();
	SWIG_fail;
    }
}
%exception Xapian::Stopper::get_description {
    try {
	$action
    } catch (...) {
	XapianSetPythonException();
	SWIG_fail;
    }
}

/* If a Python error is raised by a call to a director function, the following
 * code should cause a C++ exception to be thrown.
 */
%feature("director:except") {
    if ($error != NULL) {
	throw Swig::DirectorMethodException();
    }
}

/* vim:syntax=cpp:set noexpandtab: */
EOF

close FD or die $!;