102 lines
3.8 KiB
C
102 lines
3.8 KiB
C
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/*
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__________ ____ ___
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_____ __ _\______ \_____ _______ ______ __________\ \/ /
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/ \| | \ ___/\__ \\_ __ \/ ___// __ \_ __ \ /
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| Y Y \ | / | / __ \| | \/\___ \\ ___/| | \/ \
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|__|_| /____/|____| (____ /__| /____ >\___ >__| /___/\ \
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\/ \/ \/ \/ \_/
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Copyright (C) 2016 Ingo Berg
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All rights reserved.
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muParserX - A C++ math parser library with array and string support
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Copyright (c) 2016, Ingo Berg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef MU_IPARSER_VALUE_READER_H
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#define MU_IPARSER_VALUE_READER_H
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#include "mpValue.h"
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#include "mpIToken.h"
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#include "mpTokenReader.h"
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/** \defgroup valreader Value reader classes
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This group lists all classes that detect and parse values in an expression string.
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*/
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MUP_NAMESPACE_START
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class TokenReader;
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/** \brief Interface for custom value reader objects.
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\ingroup valreader
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Value readers are objects used for identifying values
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in an expression.
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*/
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class IValueReader
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{
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public:
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IValueReader();
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IValueReader(const IValueReader &ref);
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virtual ~IValueReader();
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/** \brief Check a certain position in an expression for the presence of a value.
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\param a_iPos [in/out] Reference to an integer value representing the current
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position of the parser in the expression.
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\param a_Val If a value is found it is stored in a_Val
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\return true if a value was found
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*/
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virtual bool IsValue(const char_type *a_szExpr,
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int &a_iPos,
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Value &a_Val ) = 0;
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/** \brief Clone this ValueReader object.
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\return Pointer to the cloned value reader object.
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*/
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virtual IValueReader* Clone(TokenReader *pParent) const = 0;
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/** \brief Assign this value reader object to a token
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reader object.
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The token reader does the tokenization of the expression.
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It uses this value reader to detect values.
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*/
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virtual void SetParent(TokenReader *pTokenReader);
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protected:
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const IToken* TokenHistory(std::size_t pos) const;
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private:
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TokenReader *m_pTokenReader; ///< Pointer to the TokenReader class used for token recognition
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}; // class IValueReader
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MUP_NAMESPACE_END
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#endif
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