wordRe.H

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    Copyright (C) 2017-2019 OpenCFD Ltd.
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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.
 
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    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
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Class
    Foam::wordRe
 
Description
    A wordRe is a Foam::word, but can contain a regular expression for
    matching words or strings.
 
    By default the constructors will generally preserve the argument as a
    string literal and the assignment operators will use the wordRe::DETECT
    compOption to scan the string for regular expression meta characters
    and/or invalid word characters and react accordingly.
 
    The exceptions are when constructing/assigning from another
    Foam::wordRe (preserve the same type) or from a Foam::word (always
    literal).
 
Note
    If the string contents are changed - eg, by the operator+=() or by
    string::replace(), etc - it will be necessary to use compile() to
    synchronize the regular expression.
 
SourceFiles
    wordRe.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef wordRe_H
#define wordRe_H
 
#include "word.H"
#include "regExp.H"
#include "keyType.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Forward Declarations
class Istream;
class Ostream;
 
/*---------------------------------------------------------------------------*\
                           Class wordRe Declaration
\*---------------------------------------------------------------------------*/
 
class wordRe
:
    public word
{
    // Private Member Data
 
        //- The regular expression
        regExp re_;
 
 
public:
 
    // Static Data Members
 
        //- An empty wordRe
        static const wordRe null;
 
 
    // Public Data Types
 
        //- Enumeration with compile options
        //  Note that 'REGEX' is implicit if 'ICASE' is specified alone.
        enum compOption
        {
            LITERAL = 0, 
            REGEX   = 1, 
            ICASE   = 2, 
            NOCASE  = 2, 
            DETECT  = 4, 
            UNKNOWN = 4, 
            REGEX_ICASE  = (REGEX|ICASE),   
            DETECT_ICASE = (DETECT|ICASE),  
        };
 
 
    // Constructors
 
        //- Construct null
        inline wordRe();
 
        //- Copy construct
        inline wordRe(const wordRe& str);
 
        //- Move construct
        inline wordRe(wordRe&& str);
 
        //- Construct from keyType, using its compile information
        inline explicit wordRe(const keyType& str);
 
        //- Copy from character array, treat as a literal
        inline explicit wordRe(const char* str);
 
        //- Copy from std::string, treat as a literal
        inline explicit wordRe(const std::string& str);
 
        //- Copy from string, treat as a literal
        inline explicit wordRe(const string& str);
 
        //- Copy from word, treat as a literal
        inline explicit wordRe(const word& str);
 
        //- Copy from keyType, use specified compile option
        inline wordRe(const keyType& str, const compOption opt);
 
        //- Copy from character array, use specified compile option
        inline wordRe(const char* str, const compOption opt);
 
        //- Copy from std::string, use specified compile option
        inline wordRe(const std::string& str, const compOption opt);
 
        //- Copy from string, use specified compile option
        inline wordRe(const string& str, const compOption opt);
 
        //- Copy from word, use specified compile option
        inline wordRe(const word& str, const compOption opt);
 
        //- Construct from Istream
        //  Words are treated as literals, strings with an auto-test
        explicit wordRe(Istream& is);
 
 
    // Member Functions
 
        //- Is this a meta character?
        inline static bool meta(char c);
 
        //- Is this character valid for a wordRe?
        //  This is largely identical with what word accepts, but also
        //  permit brace-brackets, which are valid for some regexs.
        inline static bool valid(char c);
 
        //- Test string for regular expression meta characters
        inline static bool isPattern(const std::string& str);
 
 
    // Access
 
        //- The wordRe is treated as literal string, not as pattern.
        inline bool isLiteral() const;
 
        //- The wordRe is treated as a pattern, not as literal string.
        inline bool isPattern() const;
 
 
    // Infrastructure
 
        //- Compile the regular expression
        inline bool compile();
 
        //- Possibly compile the regular expression, with greater control
        inline bool compile(const compOption opt);
 
        //- Make wordRe a literal again, instead of a regular expression.
        //  Optionally strip invalid word characters.
        inline void uncompile(bool adjust = false);
 
 
    // Editing
 
        //- Copy string, auto-test for regular expression or other options
        inline void set(const std::string& str, const compOption opt = DETECT);
 
        //- Copy string, auto-test for regular expression or other options
        inline void set(const char* str, const compOption opt = DETECT);
 
        //- Clear string and regular expression
        inline void clear();
 
        //- Swap contents. Self-swapping is a no-op
        inline void swap(wordRe& str);
 
 
    // Matching/Searching
 
        //- Smart match as regular expression or as a string.
        //  Optionally force a literal match only
        inline bool match(const std::string& text, bool literal=false) const;
 
 
    // Miscellaneous
 
        //- Return a string with quoted meta-characters
        inline string quotemeta() const;
 
        //- Output some basic info
        Ostream& info(Ostream& os) const;
 
 
    // Member Operators
 
        //- Perform smart match on text, as per match()
        //  Allows use as a predicate.
        inline bool operator()(const std::string& text) const;
 
 
        //- Copy assignment, retaining type (literal or regex)
        //  Self-assignment is a no-op.
        inline void operator=(const wordRe& str);
 
        //- Copy word, never a regular expression
        inline void operator=(const word& str);
 
        //- Copy keyType and its type (literal or regex)
        //  Always case sensitive
        inline void operator=(const keyType& str);
 
        //- Copy string, auto-test for regular expression
        //  Always case sensitive
        inline void operator=(const string& str);
 
        //- Copy string, auto-test for regular expression
        //  Always case sensitive
        inline void operator=(const std::string& str);
 
        //- Copy string, auto-test for regular expression
        //  Always case sensitive
        inline void operator=(const char* str);
 
        //- Move assignment.
        //  Self-assignment is a no-op.
        inline void operator=(wordRe&& str);
};
 
 
// IOstream Operators
 
//- Read operator
Istream& operator>>(Istream& is, wordRe& val);
 
//- Write operator
Ostream& operator<<(Ostream& os, const wordRe& val);
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "wordReI.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //