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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2025 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
OpenFOAM 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.
OpenFOAM 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 OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
\*---------------------------------------------------------------------------*/
#include "regExp.H"
#include "string.H"
#include "List.H"
// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
template<class StringType>
bool Foam::regExp::matchGrouping
(
const std::string& str,
List<StringType>& groups
) const
{
if (preg_ && str.size())
{
const size_t nmatch = ngroups() + 1;
List<regmatch_t> pmatch(nmatch);
// Also verify that the entire string was matched.
// pmatch[0] is the entire match
// pmatch[1..] are the (...) sub-groups
if
(
regexec(preg_, str.c_str(), nmatch, pmatch.begin(), 0) == 0
&& (pmatch[0].rm_so == 0 && pmatch[0].rm_eo == label(str.size()))
)
{
groups.setSize(ngroups());
label groupI = 0;
for (size_t matchI = 1; matchI < nmatch; matchI++)
{
if (pmatch[matchI].rm_so != -1 && pmatch[matchI].rm_eo != -1)
{
groups[groupI] = str.substr
(
pmatch[matchI].rm_so,
pmatch[matchI].rm_eo - pmatch[matchI].rm_so
);
}
else
{
groups[groupI].clear();
}
groupI++;
}
return true;
}
}
groups.clear();
return false;
}
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
Foam::regExp::regExp()
:
preg_(0)
{}
Foam::regExp::regExp(const char* pattern, const bool ignoreCase)
:
preg_(0)
{
set(pattern, ignoreCase);
}
Foam::regExp::regExp(const std::string& pattern, const bool ignoreCase)
:
preg_(0)
{
set(pattern.c_str(), ignoreCase);
}
// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
Foam::regExp::~regExp()
{
clear();
}
// * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * * //
void Foam::regExp::set(const char* pattern, const bool ignoreCase) const
{
clear();
// Avoid nullptr and zero-length patterns
if (pattern && *pattern)
{
int cflags = REG_EXTENDED;
if (ignoreCase)
{
cflags |= REG_ICASE;
}
const char* pat = pattern;
// Check for embedded prefix for ignore-case
// this is the only embedded prefix we support
// - a simple check is sufficient
if (!strncmp(pattern, "(?i)", 4))
{
cflags |= REG_ICASE;
pat += 4;
// avoid zero-length patterns
if (!*pat)
{
return;
}
}
preg_ = new regex_t;
int err = regcomp(preg_, pat, cflags);
if (err != 0)
{
char errbuf[200];
regerror(err, preg_, errbuf, sizeof(errbuf));
FatalErrorInFunction
<< "Failed to compile regular expression '" << pattern << "'"
<< nl << errbuf
<< exit(FatalError);
}
}
}
void Foam::regExp::set(const std::string& pattern, const bool ignoreCase) const
{
return set(pattern.c_str(), ignoreCase);
}
bool Foam::regExp::clear() const
{
if (preg_)
{
regfree(preg_);
delete preg_;
preg_ = 0;
return true;
}
return false;
}
std::string::size_type Foam::regExp::find(const std::string& str) const
{
if (preg_ && str.size())
{
size_t nmatch = 1;
regmatch_t pmatch[1];
if (regexec(preg_, str.c_str(), nmatch, pmatch, 0) == 0)
{
return pmatch[0].rm_so;
}
}
return string::npos;
}
bool Foam::regExp::match(const std::string& str) const
{
if (preg_ && str.size())
{
size_t nmatch = 1;
regmatch_t pmatch[1];
// Also verify that the entire string was matched
// pmatch[0] is the entire match
if
(
regexec(preg_, str.c_str(), nmatch, pmatch, 0) == 0
&& (pmatch[0].rm_so == 0 && pmatch[0].rm_eo == label(str.size()))
)
{
return true;
}
}
return false;
}
bool Foam::regExp::match
(
const std::string& str,
List<std::string>& groups
) const
{
return matchGrouping(str, groups);
}
bool Foam::regExp::match
(
const std::string& str,
List<Foam::string>& groups
) const
{
return matchGrouping(str, groups);
}
// * * * * * * * * * * * * * * Member Operators * * * * * * * * * * * * * * //
void Foam::regExp::operator=(const char* pat)
{
set(pat);
}
void Foam::regExp::operator=(const std::string& pat)
{
set(pat);
}
// ************************************************************************* //
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