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regExp.H
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regExp.H
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/*---------------------------------------------------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2011-2017 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/>.
Class
Foam::regExp
Description
Wrapper around POSIX extended regular expressions.
The PCRE '(?i)' extension is provided to compile the regular expression
as being case-insensitive.
See also
The manpage regex(7) for more information about POSIX regular expressions.
These differ somewhat from \c Perl and \c sed regular expressions.
SourceFiles
regExp.C
\*---------------------------------------------------------------------------*/
#ifndef regExp_H
#define regExp_H
#include <regex.h>
#include <string>
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
// Forward declaration of classes
class string;
template<class T> class List;
/*---------------------------------------------------------------------------*\
Class regExp Declaration
\*---------------------------------------------------------------------------*/
class regExp
{
// Private data
//- Precompiled regular expression
mutable regex_t* preg_;
// Private Member Functions
//- Disallow default bitwise copy construct
regExp(const regExp&);
//- Disallow default bitwise assignment
void operator=(const regExp&);
//- Return true if it matches and sets the sub-groups matched.
// Templated to support both std::string and Foam::string
template<class StringType>
bool matchGrouping
(
const std::string&,
List<StringType>& groups
) const;
public:
// Static Member Functions
//- Is character a regular expression meta-character?
// any character: '.' \n
// quantifiers: '*', '+', '?' \n
// grouping: '(', '|', ')' \n
// range: '[', ']' \n
//
// Don't bother checking for '{digit}' bounds
inline static bool meta(char c)
{
return
(
(c == '.') // any character
|| (c == '*' || c == '+' || c == '?') // quantifiers
|| (c == '(' || c == ')' || c == '|') // grouping/branching
|| (c == '[' || c == ']') // range
);
}
// Constructors
//- Construct null
regExp();
//- Construct from character array, optionally ignoring case
regExp(const char*, const bool ignoreCase=false);
//- Construct from std::string (or string), optionally ignoring case
regExp(const std::string&, const bool ignoreCase=false);
//- Destructor
~regExp();
// Member functions
// Access
//- Return true if a precompiled expression does not exist
inline bool empty() const
{
return !preg_;
}
//- Does a precompiled expression exist?
inline bool exists() const
{
return preg_ ? true : false;
}
//- Return the number of (groups)
inline int ngroups() const
{
return int(preg_ ? preg_->re_nsub : 0);
}
// Editing
//- Compile pattern into a regular expression,
// optionally ignoring case
void set(const char*, const bool ignoreCase=false) const;
//- Compile pattern into a regular expression,
// optionally ignoring case
void set(const std::string&, const bool ignoreCase=false) const;
//- Release precompiled expression.
// Returns true if precompiled expression existed before clear
bool clear() const;
// Searching
//- Find position within string.
// Returns the index where it begins or string::npos if not found
std::string::size_type find(const std::string& str) const;
//- Return true if it matches the entire string
// The begin-of-line (^) and end-of-line ($) anchors are implicit
bool match(const std::string&) const;
//- Return true if it matches and sets the sub-groups matched
// The begin-of-line (^) and end-of-line ($) anchors are implicit
bool match(const std::string&, List<std::string>& groups) const;
//- Return true if it matches and sets the sub-groups matched
// The begin-of-line (^) and end-of-line ($) anchors are implicit
bool match(const std::string&, List<string>& groups) const;
//- Return true if the regex was found within string
bool search(const std::string& str) const
{
return std::string::npos != find(str);
}
// Member Operators
//- Assign and compile pattern from a character array
// Always case sensitive
void operator=(const char*);
//- Assign and compile pattern from string
// Always case sensitive
void operator=(const std::string&);
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //