wordRe.H

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    Copyright (C) 2017-2022 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
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    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()
    or uncompile() to synchronize the regular expression.
 
SourceFiles
    wordReI.H
    wordRe.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_wordRe_H
#define Foam_wordRe_H
 
#include "word.H"
#include "regExp.H"
#include "stdFoam.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Forward Declarations
class keyType;
class token;
class wordRe;
Istream& operator>>(Istream& is, wordRe& val);
Ostream& operator<<(Ostream& os, const wordRe& val);
 
//- Hashing for wordRe
template<> struct Hash<wordRe> : string::hasher {};
 
 
/*---------------------------------------------------------------------------*\
                           Class wordRe Declaration
\*---------------------------------------------------------------------------*/
 
class wordRe
:
    public word
{
    // Private Member Data
 
        //- The regular expression
        std::unique_ptr<Foam::regExp> regexPtr_;
 
 
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
 
        //- Default construct, empty literal
        inline wordRe();
 
        //- Copy construct
        inline wordRe(const wordRe& str);
 
        //- Move construct
        inline wordRe(wordRe&& str);
 
        //- Implicit copy construct from word, as LITERAL
        inline wordRe(const word& str);
 
        //- Implicit move construct from word, as LITERAL
        inline wordRe(word&& str);
 
        //- Implicit copy construct from other string-types,
        //- with specified compile option (default is LITERAL)
        inline wordRe
        (
            const std::string& str,
            const compOption opt = compOption::LITERAL
        );
 
        //- Implicit construct from character array,
        //- with specified compile option (default is LITERAL)
        inline wordRe
        (
            const char* str,
            const compOption opt = compOption::LITERAL
        );
 
        //- Implicit copy construct from keyType, using its compile type
        wordRe(const keyType& str);
 
        //- Construct from Istream by reading a token
        //  Words are treated as literals, strings with an auto-detect
        explicit wordRe(Istream& is);
 
 
    // Member Functions
 
        //- Test for valid wordRe character?
        //  Like Foam::word, but with brace-brackets,
        //  which are valid for some regexs.
        inline static bool valid(const char c);
 
 
    // Access
 
        //- The wordRe is a literal string, not a pattern.
        inline bool isLiteral() const noexcept;
 
        //- The wordRe is a pattern, not a literal string.
        inline bool isPattern() const noexcept;
 
 
    // Infrastructure
 
        //- Inherit all regular string assign() methods
        using word::assign;
 
        //- Assign from word or string token.
        //  Words are treated as literals, strings with an auto-detect
        //  \return false if the token was the incorrect type
        bool assign(const token& tok);
 
        //- Compile as regular expression (if possible)
        inline bool compile();
 
        //- Mark as literal string, remove any regular expression
        inline void uncompile();
 
        //- Possibly compile the regular expression, with greater control
        inline bool compile(const compOption opt);
 
        //- Mark as literal string, optionally stripping invalid word
        //- characters when changing to a literal
        inline void uncompile(bool adjust);
 
 
    // 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;
 
 
    // 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
        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
 
// ************************************************************************* //