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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, 2008 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.
*/
#include "config.h"
#include <stdlib.h>
#include <assert.h>
#include "rsyslog.h"
#include "template.h"
#include "expr.h"
/* static data */
DEFobjStaticHelpers
/* Standard-Constructor
*/
BEGINobjConstruct(expr) /* be sure to specify the object type also in END macro! */
ENDobjConstruct(expr)
/* ConstructionFinalizer
* rgerhards, 2008-01-09
*/
rsRetVal exprConstructFinalize(expr_t *pThis)
{
DEFiRet;
ISOBJ_TYPE_assert(pThis, expr);
finalize_it:
RETiRet;
}
/* destructor for the expr object */
BEGINobjDestruct(expr) /* be sure to specify the object type also in END and CODESTART macros! */
CODESTARTobjDestruct(expr)
/* ... then free resources */
ENDobjDestruct(expr)
/* evaluate an expression and store the result. pMsg is optional, but if
* it is not given, no message-based variables can be accessed. The expression
* must previously have been created.
* rgerhards, 2008-02-09
*/
rsRetVal
exprEval(expr_t *pThis, msg_t *pMsg)
{
DEFiRet;
ISOBJ_TYPE_assert(pThis, expr);
RETiRet;
}
/* returns the expression result as a string. The string is read-only and valid
* only as long as the expression exists and is not newly evaluated. If the caller
* needs to access it for an extended period of time, it must copy it. This is a
* performance optimization, as most expression results are expected to be used
* only for a brief period. In such cases, it saves us the need to copy the string.
* Also, it is assumed that most callers will hold their private expression. If it
* is not shared, the caller can count on the string to remain stable as long as it
* does not reevaluate the expression (via exprEval or other means) or destruct it.
* rgerhards, 2008-02-09
*/
rsRetVal
exprGetStr(expr_t *pThis, rsCStrObj **ppStr)
{
DEFiRet;
ISOBJ_TYPE_assert(pThis, expr);
ASSERT(ppStr != NULL);
RETiRet;
}
/* parse an expression from a string. The string MUST include the full expression. The
* expression object is only created if there is no error during parsing.
* The string is a standard C string. It must NOT contain anything else but the
* expression. Most importantly, it must not contain any comments after the
* expression.
* rgerhards, 2008-02-09 (a rainy tenerife return flight day ;))
*/
rsRetVal
exprParseStr(expr_t **ppThis, uchar *p)
{
DEFiRet;
expr_t *pThis = NULL;
ASSERT(ppThis != NULL);
ASSERT(p != NULL);
CHKiRet(exprConstruct(&pThis));
CHKiRet(rsCStrConstruct(&pThis->cstrConst));
/* so far, we are a dummy - we just pull the first string and
* ignore the rest...
*/
while(*p && *p != '"')
++p; /* find begin of string */
if(*p == '"')
++p; /* eat it */
/* we got it, now copy over everything up until the end of the string */
while(*p && *p != '"') {
CHKiRet(rsCStrAppendChar(pThis->cstrConst, *p));
++p;
}
/* we are done with it... */
CHKiRet(rsCStrFinish(pThis->cstrConst));
CHKiRet(exprConstructFinalize(&pThis));
/* we are successfully done, so store the result */
*ppThis = pThis;
finalize_it:
if(iRet != RS_RET_OK) {
if(pThis != NULL)
exprDestruct(pThis);
}
RETiRet;
}
/* Initialize the expr class. Must be called as the very first method
* before anything else is called inside this class.
* rgerhards, 2008-02-19
*/
BEGINObjClassInit(expr, 1) /* class, version */
OBJSetMethodHandler(objMethod_CONSTRUCTION_FINALIZER, exprConstructFinalize);
ENDObjClassInit(expr)
/* vi:set ai:
*/
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