token.H

Go to the documentation of this file.

/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2017-2020 OpenCFD Ltd.
-------------------------------------------------------------------------------
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::token
 
Description
    A token holds an item read from Istream.
 
SourceFiles
    tokenI.H
    token.C
    tokenIO.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef token_H
#define token_H
 
#include "label.H"
#include "uLabel.H"
#include "scalar.H"
#include "word.H"
#include "InfoProxy.H"
#include "refCount.H"
#include "typeInfo.H"
 
#define NoHashTableC
#include "runTimeSelectionTables.H"
 
#include <iostream>
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Forward Declarations
class token;
Ostream& operator<<(Ostream& os, const token& tok);
 
 
/*---------------------------------------------------------------------------*\
                            Class token Declaration
\*---------------------------------------------------------------------------*/
 
class token
{
public:
 
    //- Enumeration defining the types of token.
    //  Since these values are also used to tag content in Pstream,
    //  the maximum number of types is limited to 30.
    enum tokenType
    {
        UNDEFINED = 0,    
 
        // Fundamental types
        FLAG,             
        PUNCTUATION,      
        BOOL,             
        LABEL,            
        FLOAT,            
        DOUBLE,           
 
        // Pointer types
        WORD,             
        STRING,           
        DIRECTIVE,        
        VARIABLE,         
        VERBATIM,         
        COMPOUND,         
 
        ERROR,            
 
        // Aliases
        FLOAT_SCALAR = FLOAT,
        DOUBLE_SCALAR = DOUBLE,
        VERBATIMSTRING = VERBATIM
    };
 
 
    //- Stream or output control flags (1-byte width)
    enum flagType
    {
        NO_FLAG = 0,   
        ASCII   = 1,   
        BINARY  = 2    
    };
 
 
    //- Standard punctuation tokens (a character)
    enum punctuationToken : char
    {
        NULL_TOKEN     = '\0',  
        SPACE          = ' ',   
        TAB            = '\t',  
        NL             = '\n',  
 
        END_STATEMENT  = ';',   
        BEGIN_LIST     = '(',   
        END_LIST       = ')',   
        BEGIN_SQR      = '[',   
        END_SQR        = ']',   
        BEGIN_BLOCK    = '{',   
        END_BLOCK      = '}',   
        COLON          = ':',   
        COMMA          = ',',   
        HASH           = '#',   
        DOLLAR         = '$',   
        ATSYM          = '@',   
        SQUOTE         = '\'',  
        DQUOTE         = '"',   
 
        ASSIGN         = '=',   
        ADD            = '+',   
        SUBTRACT       = '-',   
        MULTIPLY       = '*',   
        DIVIDE         = '/',   
 
        BEGIN_STRING   = DQUOTE, 
        END_STRING     = DQUOTE  
    };
 
 
    //- Abstract base class for complex tokens
    class compound
    :
        public refCount
    {
        bool empty_;
 
        //- No copy construct
        compound(const compound&) = delete;
 
        //- No copy assignment
        compound& operator=(const compound&) = delete;
 
    public:
 
        //- Declare type-name, virtual type (with debug switch)
        TypeName("compound");
 
        //- Declare run-time constructor selection table
        declareRunTimeSelectionTable
        (
            autoPtr,
            compound,
            Istream,
            (Istream& is),
            (is)
        );
 
 
        // Constructors
 
            //- Default construct
            compound()
            :
                empty_(false)
            {}
 
 
        // Selectors
 
            //- Select null constructed
            static autoPtr<compound> New(const word& type, Istream& is);
 
            //- Return true if name is a known (registered) compound type
            static bool isCompound(const word& name);
 
 
        //- Destructor
        virtual ~compound() = default;
 
 
        // Member Functions
 
            bool empty() const
            {
                return empty_;
            }
 
            bool& empty()
            {
                return empty_;
            }
 
            virtual label size() const = 0;
 
            virtual void write(Ostream& os) const = 0;
 
 
        // Operators
 
            //- Output operator
            friend Ostream& operator<<(Ostream& os, const compound& ct);
    };
 
 
    //- A templated class for holding compound tokens
    template<class T>
    class Compound
    :
        public token::compound,
        public T
    {
    public:
 
        //- Declare type-name, virtual type (with debug switch)
        TypeName("Compound<T>");
 
        Compound(Istream& is)
        :
            T(is)
        {}
 
        label size() const
        {
            return T::size();
        }
 
        void write(Ostream& os) const
        {
            operator<<(os, static_cast<const T&>(*this));
        }
    };
 
 
    //- An undefined token
    static const token undefinedToken;
 
 
private:
 
    //- A %union of token types
    union content
    {
        // Fundamental values. Largest first for any {} initialization.
        int64_t int64Val;
        int32_t int32Val;
 
        int flagVal;   // bitmask - stored as int, not enum
        punctuationToken punctuationVal;
        label labelVal;
        floatScalar floatVal;
        doubleScalar doubleVal;
 
        // Pointers
        word* wordPtr;
        string* stringPtr;
        mutable compound* compoundPtr;
    };
 
 
    // Private Data
 
        //- The data content (as a union).
        //  For memory alignment this should appear as the first member.
        content data_;
 
        //- The token type
        tokenType type_;
 
        //- Line number in the file the token was read from
        label lineNumber_;
 
 
    // Private Member Functions
 
        //- Set as UNDEFINED and zero the union content without any checking
        inline void setUndefined();
 
        // Parse error, expected 'expected', found ...
        void parseError(const char* expected) const;
 
 
public:
 
    // Static Data Members
 
        //- The type name is "token"
        static constexpr const char* const typeName = "token";
 
 
    // Constructors
 
        //- Default construct, initialized to an UNDEFINED token.
        inline constexpr token() noexcept;
 
        //- Copy construct
        inline token(const token& t);
 
        //- Move construct. The original token is left as UNDEFINED.
        inline token(token&& t);
 
        //- Construct punctuation character token
        inline explicit token(punctuationToken p, label lineNumber=0);
 
        //- Construct label token
        inline explicit token(const label val, label lineNumber=0);
 
        //- Construct float token
        inline explicit token(const floatScalar val, label lineNumber=0);
 
        //- Construct double token
        inline explicit token(const doubleScalar val, label lineNumber=0);
 
        //- Copy construct word token
        inline explicit token(const word& w, label lineNumber=0);
 
        //- Copy construct string token
        inline explicit token(const string& str, label lineNumber=0);
 
        //- Move construct word token
        inline explicit token(word&& w, label lineNumber=0);
 
        //- Move construct string token
        inline explicit token(string&& str, label lineNumber=0);
 
        //- Construct from Istream
        explicit token(Istream& is);
 
 
    //- Destructor
    inline ~token();
 
 
    // Static Functions
 
        //- Create a bool token.
        inline static token boolean(bool on);
 
        //- Create a token with stream flags, no sanity check
        //
        //  \param bitmask the flags to set
        inline static token flag(int bitmask);
 
        //- True if the character is a punctuation separator (eg, in ISstream).
        //  Since it could also start a number, SUBTRACT is not included as
        //  a separator.
        //
        //  \param c the character to test, passed as int for consistency with
        //      isdigit, isspace etc.
        inline static bool isseparator(int c);
 
 
    // Member Functions
 
    // Status
 
        //- Return the name of the token type
        word name() const;
 
        //- Return the token type
        inline tokenType type() const;
 
        //- Change the token type, for similar types.
        //  This can be used to change between string-like variants
        //  (eg, STRING, VARIABLE, etc)
        //  To change types entirely (eg, STRING to DOUBLE),
        //  use the corresponding assignment operator.
        //
        //  \return true if the change was successful or no change was required
        inline bool setType(const tokenType tokType);
 
        //- The line number for the token
        inline label lineNumber() const;
 
        //- The line number for the token
        inline label& lineNumber();
 
        //- True if token is not UNDEFINED or ERROR
        inline bool good() const;
 
        //- Token is UNDEFINED
        inline bool undefined() const;
 
        //- Token is ERROR
        inline bool error() const;
 
        //- Token is BOOL
        inline bool isBool() const;
 
        //- Token is FLAG
        inline bool isFlag() const;
 
        //- Token is PUNCTUATION
        inline bool isPunctuation() const;
 
        //- Token is PUNCTUATION and isseparator
        inline bool isSeparator() const;
 
        //- Token is LABEL
        inline bool isLabel() const;
 
        //- Token is FLOAT
        inline bool isFloat() const;
 
        //- Token is DOUBLE
        inline bool isDouble() const;
 
        //- Token is FLOAT or DOUBLE
        inline bool isScalar() const;
 
        //- Token is LABEL, FLOAT or DOUBLE
        inline bool isNumber() const;
 
        //- Token is WORD or DIRECTIVE word
        inline bool isWord() const;
 
        //- Token is DIRECTIVE (word variant)
        inline bool isDirective() const;
 
        //- Token is STRING, VARIABLE or VERBATIM string
        inline bool isString() const;
 
        //- Token is VARIABLE (string variant)
        inline bool isVariable() const;
 
        //- Token is VERBATIM string (string variant)
        inline bool isVerbatim() const;
 
        //- Token is WORD, DIRECTIVE, STRING, VARIABLE or VERBATIM
        inline bool isStringType() const;
 
        //- Token is COMPOUND
        inline bool isCompound() const;
 
 
    // Access
 
        //- Return boolean token value.
        //  Report FatalIOError and return false if token is not BOOL or LABEL
        inline bool boolToken() const;
 
        //- Return flag bitmask value.
        //  Report FatalIOError and return NO_FLAG if token is not FLAG
        inline int flagToken() const;
 
        //- Return punctuation character.
        //  Report FatalIOError and return \b \\0 if token is not PUNCTUATION
        inline punctuationToken pToken() const;
 
        //- Return label value.
        //  Report FatalIOError and return \b 0 if token is not LABEL
        inline label labelToken() const;
 
        //- Return float value.
        //  Report FatalIOError and return \b 0 if token is not FLOAT
        inline floatScalar floatToken() const;
 
        //- Return double value.
        //  Report FatalIOError and return \b 0 if token is not DOUBLE
        inline doubleScalar doubleToken() const;
 
        //- Return float or double value.
        //  Report FatalIOError and return \b 0 if token is not a
        //  FLOAT or DOUBLE
        inline scalar scalarToken() const;
 
        //- Return label, float or double value.
        //  Report FatalIOError and return \b 0 if token is not a
        //  LABEL, FLOAT or DOUBLE
        inline scalar number() const;
 
        //- Return const reference to the word contents.
        //  Report FatalIOError and return \b "" if token is not a
        //  WORD or DIRECTIVE
        inline const word& wordToken() const;
 
        //- Return const reference to the string contents.
        //  Report FatalIOError and return \b "" if token is not a
        //  STRING, VARIABLE, VERBATIM or an upcast WORD or DIRECTIVE
        inline const string& stringToken() const;
 
        //- Read access for compound token
        inline const compound& compoundToken() const;
 
        //- Return reference to compound token and decrease its internal
        //- refCount accordingly.
        //  The Istream is used for reference error messages only.
        compound& transferCompoundToken(const Istream& is);
 
 
    // Edit
 
        //- Reset token to UNDEFINED and clear any allocated storage
        inline void reset();
 
        //- Clear token and set to be ERROR.
        inline void setBad();
 
        //- Swap token contents: type, data, line-number
        inline void swap(token& tok);
 
 
    // Info
 
        //- Return info proxy for printing token information to a stream
        InfoProxy<token> info() const
        {
            return *this;
        }
 
 
    // Member Operators
 
    // Assignment
 
        //- Copy assign
        inline void operator=(const token& tok);
 
        //- Move assign
        inline void operator=(token&& tok);
 
        //- Copy assign from punctuation
        inline void operator=(const punctuationToken p);
 
        //- Copy assign from label
        inline void operator=(const label val);
 
        //- Copy assign from float
        inline void operator=(const floatScalar val);
 
        //- Copy assign from double
        inline void operator=(const doubleScalar val);
 
        //- Copy assign from word
        inline void operator=(const word& w);
 
        //- Copy assign from string
        inline void operator=(const string& str);
 
        //- Move assign from word
        inline void operator=(word&& w);
 
        //- Move assign from string
        inline void operator=(string&& str);
 
        //- Assign compound with reference counting to token
        inline void operator=(compound* compoundPtr);
 
 
    // Equality
 
        inline bool operator==(const token& tok) const;
        inline bool operator==(const punctuationToken p) const;
        inline bool operator==(const label val) const;
        inline bool operator==(const floatScalar val) const;
        inline bool operator==(const doubleScalar val) const;
        inline bool operator==(const std::string& s) const;
 
 
    // Inequality
 
        inline bool operator!=(const token& tok) const;
        inline bool operator!=(const punctuationToken p) const;
        inline bool operator!=(const label val) const;
        inline bool operator!=(const floatScalar val) const;
        inline bool operator!=(const doubleScalar val) const;
        inline bool operator!=(const std::string& s) const;
 
 
    // IOstream Operators
 
        friend Ostream& operator<<(Ostream& os, const token& tok);
 
        friend Ostream& operator<<(Ostream& os, const punctuationToken& pt);
        friend ostream& operator<<(ostream& os, const punctuationToken& pt);
 
        friend ostream& operator<<(ostream& os, const InfoProxy<token>& ct);
 
 
    // Housekeeping
 
        //- Token is FLOAT
        //  \deprecated(2020-01) - isFloat()
        bool isFloatScalar() const { return isFloat(); };
 
        //- Token is DOUBLE
        //  \deprecated(2020-01) - isDouble()
        bool isDoubleScalar() const { return isDouble(); }
 
        //- Return float value.
        //  \deprecated(2020-01) - floatToken()
        floatScalar floatScalarToken() const { return floatToken(); }
 
        //- Return double value.
        //  \deprecated(2020-01) - doubleToken()
        doubleScalar doubleScalarToken() const { return doubleToken(); }
 
        //- Deprecated(2017-11) transfer word pointer to the token
        //  \deprecated(2017-11) - use move assign from word
        void operator=(word*) = delete;
 
        //- Deprecated(2017-11) transfer string pointer to the token
        //  \deprecated(2017-11) - use move assign from string
        void operator=(string*) = delete;
};
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
// IOstream Operators
 
Istream& operator>>(Istream& is, token& tok);
Ostream& operator<<(Ostream& os, const token::punctuationToken& pt);
ostream& operator<<(ostream& os, const token::punctuationToken& pt);
Ostream& operator<<(Ostream& os, const token::compound& ct);
 
ostream& operator<<(ostream& os, const InfoProxy<token>& ip);
 
template<>
Ostream& operator<<(Ostream& os, const InfoProxy<token>& ip);
 
 
// Handling of compound types
 
#define defineCompoundTypeName(Type, Name)                                     \
    defineTemplateTypeNameAndDebugWithName(token::Compound<Type>, #Type, 0);
 
#define addCompoundToRunTimeSelectionTable(Type, Name)                         \
    token::compound::addIstreamConstructorToTable<token::Compound<Type>>       \
        add##Name##IstreamConstructorToTable_;
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "tokenI.H"
#include "Istream.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //