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/* $Id: Matching.cpp $ */
/** @file
* @todo r=bird: brief description, please.
*
* Definition of template classes that provide simple API to
* do matching between values and value filters constructed from strings.
*/
/*
* Copyright (C) 2006-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* 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, in version 3 of the
* License.
*
* 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, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#define LOG_GROUP LOG_GROUP_MAIN
#include "Matching.h"
#include "LoggingNew.h"
#include <stdlib.h>
#include <iprt/errcore.h>
namespace matching
{
// static
void ParsedIntervalFilter_base::parse (const char *aFilter,
ParsedIntervalFilter_base *that)
{
// initially null and valid
that->mNull = true;
that->mValid = true;
that->mErrorPosition = 0;
if (!aFilter || strncmp(aFilter, RT_STR_TUPLE("int:")) != 0)
return;
that->mNull = false;
size_t len = strlen (aFilter);
Mode mode = Single; // what's expected next
size_t start = 4, end = 4;
size_t err = 0; // less than 4 indicates success
do
{
end = strcspn(aFilter + start, ",-");
end += start;
char delim = aFilter[end];
if (delim == '-')
{
if (mode == End)
{
err = end;
break;
}
else
mode = Start;
}
// skip spaces around numbers
size_t s = start;
while (s < end && aFilter[s] == ' ') ++s;
size_t e = end - 1;
while (e > s && aFilter[e] == ' ') --e;
++e;
that->parseValue(aFilter, s, e, mode);
if (!that->mValid)
return;
if (mode == Start)
mode = End;
else if (mode == End)
mode = Single;
start = end + 1;
}
while (start <= len);
if (err >= 4)
{
that->mValid = false;
that->mErrorPosition = err;
}
}
// static
size_t ParsedIntervalFilter_base::parseValue (
const char *aFilter, size_t aStart, size_t aEnd,
bool aIsSigned, const Limits &aLimits,
Widest &val)
{
char *endptr = NULL;
int vrc = 0;
if (aIsSigned)
vrc = RTStrToInt64Ex(aFilter + aStart, &endptr, 0, &val.ll);
else
vrc = RTStrToUInt64Ex(aFilter + aStart, &endptr, 0, &val.ull);
AssertReturn(endptr, 0);
size_t parsed = (size_t)(endptr - aFilter);
// return parsed if not able to parse to the end
if (parsed != aEnd)
return parsed;
// return aStart if out if range
if (vrc == VWRN_NUMBER_TOO_BIG ||
(aIsSigned &&
(val.ll < aLimits.min.ll ||
val.ll > aLimits.max.ll)) ||
(!aIsSigned &&
(val.ull < aLimits.min.ull ||
val.ull > aLimits.max.ull)))
return aStart;
return parsed;
}
void ParsedBoolFilter::parse (const Bstr &aFilter)
{
mNull = false;
mValid = true;
mErrorPosition = 0;
if (aFilter.isEmpty())
{
mValueAny = true;
mValue = false;
}
else
{
mValueAny = false;
if (aFilter == L"true" || aFilter == L"yes" || aFilter == L"1")
mValue = true;
else
if (aFilter == L"false" || aFilter == L"no" || aFilter == L"0")
mValue = false;
else
mValid = false;
}
}
void ParsedRegexpFilter_base::parse (const Bstr &aFilter)
{
/// @todo (dmik) parse "rx:<regexp>" string
// note, that min/max checks must not be done, when the string
// begins with "rx:". These limits are for exact matching only!
// empty or null string means any match (see #isMatch() below),
// so we don't apply Min/Max restrictions in this case
if (!aFilter.isEmpty())
{
size_t len = aFilter.length();
if (mMinLen > 0 && len < mMinLen)
{
mNull = mValid = false;
mErrorPosition = len;
return;
}
if (mMaxLen > 0 && len > mMaxLen)
{
mNull = mValid = false;
mErrorPosition = mMaxLen;
return;
}
}
mSimple = aFilter;
mNull = false;
mValid = true;
mErrorPosition = 0;
}
bool ParsedRegexpFilter_base::isMatch (const Bstr &aValue) const
{
/// @todo (dmik) do regexp matching
// empty or null mSimple matches any match
return mSimple.isEmpty()
|| (mIgnoreCase && mSimple.compare(aValue, Bstr::CaseInsensitive) == 0)
|| (!mIgnoreCase && mSimple.compare(aValue) == 0);
}
} /* namespace matching */
/* vi: set tabstop=4 shiftwidth=4 expandtab: */
|
