45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
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//***************************************************************************
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//
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// (c) 2000 by Microsoft Corp. All Rights Reserved.
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//
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// like.h
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//
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// a-davcoo 28-Feb-00 Implements the SQL like operation.
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//
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//***************************************************************************
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#ifndef _LIKE_H_
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#define _LIKE_H_
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#include <string.h>
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// The CLike class implements the SQL "like" operation. To compare test strings
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// to an expression, construct an instance of the CLike class using the expression
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// and an optional escape character. Then use the Match() method on that instance
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// to test each string. Note, this class makes it's own copy of the expression
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// used to construct it. This implementation supports the '%' and '_' wildard
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// characters as well as the [] and [^] constructs for matching sets of characters
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// and ranges of characters.
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class CLike
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{
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public:
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CLike (LPCWSTR expression, WCHAR escape='\0');
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~CLike (void);
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bool Match (LPCWSTR string);
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protected:
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LPWSTR m_expression;
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WCHAR m_escape;
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// Recursive function and helpers for performing like operation.
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bool DoLike (LPCWSTR pattern, LPCWSTR string, WCHAR escape);
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bool MatchSet (LPCWSTR pattern, LPCWSTR string, int &skip);
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};
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#endif // _LIKE_H_
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