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/* expr.c - an expression class.
* This module contains all code needed to represent expressions. Most
* importantly, that means code to parse and execute them. Expressions
* heavily depend on (loadable) functions, so it works in conjunction
* with the function manager.
*
* Module begun 2007-11-30 by Rainer Gerhards
*
* Copyright 2007 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of rsyslog.
*
* Rsyslog 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 3 of the License, or
* (at your option) any later version.
*
* Rsyslog 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 Rsyslog. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*/
/* This is the syntax of an expression. I keep it as inline documentation
* as this enhances the chance that it is updates should there be a change.
*
* expr = (simple-string / template-string / function / property) [* expr ]
* simple-string = "'" chars "'"
* template-string = '"' template-as--1.19.11-and-below '"'
* ; string as used in previous $template directive
* function = function-name "(" expr ")"
* property = [list of property names]
*/
/* vi:set ai:
*/
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