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/*
* Copyright (c) 2023 Balazs Scheidler <balazs.scheidler@axoflow.com>
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#ifndef FILTERX_EXPR_H_INCLUDED
#define FILTERX_EXPR_H_INCLUDED
#include "filterx-object.h"
#include "cfg-lexer.h"
typedef struct _FilterXExpr FilterXExpr;
struct _FilterXExpr
{
guint32 ref_cnt;
const gchar *type;
guint32 ignore_falsy_result:1;
/* evaluate expression */
FilterXObject *(*eval)(FilterXExpr *self);
/* not to be used except for FilterXMessageRef, replace any cached values
* with the unmarshaled version */
void (*_update_repr)(FilterXExpr *self, FilterXObject *new_repr);
/* assign a new value to this expr */
gboolean (*assign)(FilterXExpr *self, FilterXObject *new_value);
/* is the expression set? */
gboolean (*is_set)(FilterXExpr *self);
/* unset the expression */
gboolean (*unset)(FilterXExpr *self);
void (*free_fn)(FilterXExpr *self);
CFG_LTYPE lloc;
gchar *expr_text;
};
/*
* Evaluate the expression and return the result as a FilterXObject. The
* result can either be a
*
* 1) raw representation (e.g. a marshalled series of bytes + syslog-ng
* type hint encapsulated into a FilterXMessageValue)
*
* 2) typed representation (e.g. a demarshalled object, something other
* than FilterXMessageValue, like FilterXJSON)
*
* If the caller is not ok with handling the raw representation, just use
* filterx_expr_eval_typed() which will unmarshall any values before
* returning them.
*/
static inline FilterXObject *
filterx_expr_eval(FilterXExpr *self)
{
return self->eval(self);
}
/*
* Evaluate the expression and return the result as a typed FilterXObject.
* This function will call filterx_expr_eval() and then unmarshal the result
* so the result is always a typed object.
*/
static inline FilterXObject *
filterx_expr_eval_typed(FilterXExpr *self)
{
FilterXObject *result = filterx_expr_eval(self);
if (!result)
return NULL;
FilterXObject *unmarshalled = filterx_object_unmarshal(result);
if (!unmarshalled)
{
filterx_object_unref(result);
return NULL;
}
if (result == unmarshalled)
{
filterx_object_unref(unmarshalled);
return result;
}
filterx_object_unref(result);
if (self->_update_repr)
self->_update_repr(self, unmarshalled);
return unmarshalled;
}
static inline gboolean
filterx_expr_assign(FilterXExpr *self, FilterXObject *new_value)
{
if (self->assign)
return self->assign(self, new_value);
return FALSE;
}
static inline gboolean
filterx_expr_is_set(FilterXExpr *self)
{
if (self->is_set)
return self->is_set(self);
return FALSE;
}
static inline gboolean
filterx_expr_unset(FilterXExpr *self)
{
if (self->unset)
return self->unset(self);
return FALSE;
}
void filterx_expr_set_location(FilterXExpr *self, CfgLexer *lexer, CFG_LTYPE *lloc);
EVTTAG *filterx_expr_format_location_tag(FilterXExpr *self);
void filterx_expr_init_instance(FilterXExpr *self);
FilterXExpr *filterx_expr_new(void);
FilterXExpr *filterx_expr_ref(FilterXExpr *self);
void filterx_expr_unref(FilterXExpr *self);
void filterx_expr_free_method(FilterXExpr *self);
typedef struct _FilterXUnaryOp
{
FilterXExpr super;
FilterXExpr *operand;
} FilterXUnaryOp;
void filterx_unary_op_free_method(FilterXExpr *s);
void filterx_unary_op_init_instance(FilterXUnaryOp *self, FilterXExpr *operand);
typedef struct _FilterXBinaryOp
{
FilterXExpr super;
FilterXExpr *lhs, *rhs;
} FilterXBinaryOp;
void filterx_binary_op_free_method(FilterXExpr *s);
void filterx_binary_op_init_instance(FilterXBinaryOp *self, FilterXExpr *lhs, FilterXExpr *rhs);
gboolean filterx_expr_list_eval(GList *expressions, FilterXObject **result);
#endif
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