138 lines
5.2 KiB
C
138 lines
5.2 KiB
C
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/** \file
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\brief Definition of the token reader used to break the expression string up
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into tokens.
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<pre>
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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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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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</pre>
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*/
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#ifndef MUP_TOKEN_READER_H
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#define MUP_TOKEN_READER_H
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//--- Standard includes ----------------------------------------------------
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#include <cstdio>
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#include <cstring>
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#include <map>
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#include <stack>
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#include <string>
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#include <list>
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//--- muParserX framework --------------------------------------------------
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#include "mpIToken.h"
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#include "mpError.h"
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#include "mpStack.h"
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#include "mpFwdDecl.h"
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MUP_NAMESPACE_START
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/** \brief Token reader for the ParserXBase class. */
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class TokenReader
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{
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friend class ParserXBase;
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public:
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typedef std::vector<ptr_tok_type> token_buf_type;
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private:
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TokenReader(const TokenReader &a_Reader);
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TokenReader& operator=(const TokenReader &a_Reader);
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void Assign(const TokenReader &a_Reader);
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void DeleteValReader();
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void SetParent(ParserXBase *a_pParent);
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int ExtractToken(const char_type *a_szCharSet, string_type &a_sTok, int a_iPos) const;
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void SkipCommentsAndWhitespaces();
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bool IsBuiltIn(ptr_tok_type &t);
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bool IsEOF(ptr_tok_type &t);
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bool IsNewline(ptr_tok_type &a_Tok);
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bool IsNewLine(ptr_tok_type &t);
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bool IsInfixOpTok(ptr_tok_type &t);
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bool IsFunTok(ptr_tok_type &t);
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bool IsPostOpTok(ptr_tok_type &t);
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bool IsOprt(ptr_tok_type &t);
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bool IsValTok(ptr_tok_type &t);
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bool IsVarOrConstTok(ptr_tok_type &t);
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bool IsUndefVarTok(ptr_tok_type &t);
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bool IsComment();
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const ptr_tok_type& Store(const ptr_tok_type &t, int pos);
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ParserXBase *m_pParser; ///< Pointer to the parser bound to this token reader
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string_type m_sExpr; ///< The expression beeing currently parsed
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int m_nPos; ///< Current parsing position in the expression
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int m_nNumBra; ///< Number of open parenthesis
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int m_nNumIndex; ///< Number of open index paranethesis
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int m_nNumCurly; ///< Number of open curly brackets
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int m_nNumIfElse; ///< Coubter for if-then-else levels
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int m_nSynFlags; ///< Flags to controll the syntax flow
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token_buf_type m_vTokens;
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ECmdCode m_eLastTokCode;
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mutable fun_maptype *m_pFunDef;
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mutable oprt_bin_maptype *m_pOprtDef;
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mutable oprt_ifx_maptype *m_pInfixOprtDef;
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mutable oprt_pfx_maptype *m_pPostOprtDef;
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mutable val_maptype *m_pConstDef;
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val_vec_type *m_pDynVarShadowValues; ///< Value items created for holding values of variables created at parser runtime
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var_maptype *m_pVarDef; ///< The only non const pointer to parser internals
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readervec_type m_vValueReader; ///< Value token identification function
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var_maptype m_UsedVar;
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float_type m_fZero; ///< Dummy value of zero, referenced by undefined variables
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public:
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TokenReader(ParserXBase *a_pParent);
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~TokenReader();
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TokenReader* Clone(ParserXBase *a_pParent) const;
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void AddValueReader(IValueReader *a_pReader);
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void AddSynFlags(int flag);
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int GetPos() const;
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const string_type& GetExpr() const;
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const var_maptype& GetUsedVar() const;
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const token_buf_type& GetTokens() const;
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void SetExpr(const string_type &a_sExpr);
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void ReInit();
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ptr_tok_type ReadNextToken();
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}; // class TokenReader
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MUP_NAMESPACE_END
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#endif
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