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Diffstat (limited to 'src/include/xbexpnode.h')
| -rwxr-xr-x | src/include/xbexpnode.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/src/include/xbexpnode.h b/src/include/xbexpnode.h new file mode 100755 index 0000000..51efa9b --- /dev/null +++ b/src/include/xbexpnode.h @@ -0,0 +1,120 @@ +/* xbexpnode.h + +XBase64 Software Library + +Copyright (c) 1997,2003,2014,2022 Gary A Kunkel + +The xb64 software library is covered under the terms of the GPL Version 3, 2007 license. + +Email Contact: + + XDB-devel@lists.sourceforge.net + XDB-users@lists.sourceforge.net + +*/ + + +#ifndef __XB_EXPNODE_H__ +#define __XB_EXPNODE_H__ + +// #ifdef CMAKE_COMPILER_IS_GNUCC +// #pragma interface +// #endif + +#ifdef XB_EXPRESSION_SUPPORT + + +namespace xb{ + +//class XBDLLEXPORT xbDbf; + +/************************************************************************/ +//! @brief Expression node class for handling expression nodes. +/*! +The xbExpNode class is used by the expression logic for handling specific +nodes within a tree of nodes.<br> + +Expressions are parsed into nodes and a logical tree of nodes is created +out of all the individual components within the expression.<br> + +This class is used for handling a specific node within a tree.<br> + +An application program will typically not need to be concerned with +this class.<br> + +*/ +class XBDLLEXPORT xbExpNode { + public: + xbExpNode(); + xbExpNode( xbString &sNodeText, char cReturnType, char cNodeType ); + xbExpNode( xbString &sNodeText, char cNodeType ); + xbExpNode( char cNodeType ); + + virtual ~xbExpNode(); + xbInt16 AddChild( xbExpNode *n ); + xbExpNode *GetChild( xbUInt32 ulChildNo ) const; + xbUInt32 GetChildCnt() const; + xbUInt32 GetChildNo() const; + xbDbf *GetDbf() const; + xbInt16 GetFieldNo() const; + xbExpNode *GetFirstNode(); + xbExpNode *GetNextNode() const; + void GetNodeText( xbString &sNodeText ) const; + char GetNodeType() const; + xbExpNode *GetParent() const; + xbString &GetStringResult(); + xbBool GetBoolResult() const; + xbDouble GetNumericResult() const; + xbUInt32 GetResultLen() const; + xbExpNode *GetRightSibling() const; + char GetReturnType() const; + xbInt16 GetWeight() const; + xbBool HasRightSibling() const; + xbBool IsOperator() const; + xbBool IsUnaryOperator() const; + void RemoveLastChild(); + void SetResultLen( xbUInt32 ulResultLen ); + void SetDbfInfo( xbDbf *dbf ); + void SetDbfInfo( xbDbf *dbf, xbInt16 iFieldNo ); + void SetNodeText( xbString &sNodeText ); + void SetNodeType( char cNodeType ); + void SetParent( xbExpNode *n ); + void SetResult( xbString &sResult ); + void SetResult( xbDate &dtResult ); + void SetResult( xbBool bResult ); + void SetResult( xbDouble dResult ); + void SetReturnType( char cReturnType ); + void SetWeight( xbInt16 iWeight ); + + #ifdef XB_DEBUG_SUPPORT + void DumpNode( xbInt16 iOption ) const; // 0 = no children, 1 = and children + #endif + + private: + xbString sNodeText; // expression text + char cReturnType; // one of: XB_EXP_CHAR, XB_EXP_DATE, XB_EXP_LOGICAL, XB_EXP_NUMERIC + char cNodeType; // one of: XB_EXP_CONSTANT, XB_EXP_FUNCTION, XB_EXP_FIELD, XB_EXP_OPERATOR + xbString sResult; // char result, and operator + xbDouble dResult; // numeric and bool results + xbExpNode * nParent; // pointer to parent + xbLinkList<xbExpNode *> llChildren; // linked list of descendent nodes + xbDbf *dbf; // pointer to dbf, used for field, RECNO() and RECCOUNT() + xbInt16 iFieldNo; // field no if DBF field + xbUInt32 ulResultLen; // for string results, accumulated length of character operations + // includes the sum of all nodes under this + this + // date = 8, numeric = 4, logical = 1 + xbInt16 iWeight; // used for building the tree of nodes, assigned to operators + // the higher the number, the lower it goes on the tree + +}; + +/************************************************************************/ + +/* Expression handler */ + + +}; +#endif // XB_EXPRESSION_SUPPORT +#endif // __XB_EXP_H__ + + |