135 lines
3.6 KiB
C++
135 lines
3.6 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Copyright (C) 1992-1998, Microsoft Corporation.
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//
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// File: SCANNER.HXX
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//
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// Contents: Query scanner
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//
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// Classes: CQueryScanner
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//
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// History: 29-Apr-92 AmyA Created.
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// 23-Jun-92 MikeHew Added weight tokens.
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// 15-Jun-94 t-jeffc Added regex support & error info
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//
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//----------------------------------------------------------------------------
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#pragma once
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#include <ci64.hxx>
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enum Token {
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EQUAL_TOKEN = 0, // the order of these operators is important -
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NOT_EQUAL_TOKEN, // they are used to index an array
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GREATER_TOKEN,
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GREATER_EQUAL_TOKEN,
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LESS_TOKEN,
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LESS_EQUAL_TOKEN,
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ALLOF_TOKEN,
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SOMEOF_TOKEN,
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AND_TOKEN, // order doesn't matter from here on...
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OR_TOKEN,
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PROX_TOKEN,
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NOT_TOKEN,
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FUZZY_TOKEN,
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FUZ2_TOKEN,
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PROP_TOKEN,
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PROP_REGEX_TOKEN,
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PROP_NATLANG_TOKEN,
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OPEN_TOKEN,
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CLOSE_TOKEN,
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W_OPEN_TOKEN,
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W_CLOSE_TOKEN,
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COMMA_TOKEN,
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EOS_TOKEN,
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TEXT_TOKEN,
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QUOTES_TOKEN,
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C_OPEN_TOKEN,
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C_CLOSE_TOKEN,
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PLUS_TOKEN,
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CONTAINS_TOKEN,
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ISEMPTY_TOKEN,
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ISTYPEEQUAL_TOKEN
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};
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// chars that cannot appear in a phrase
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#define PHRASE_STR L"{}!&|~*@#$()[],=<>\n\"^"
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// chars that cannot appear in a command or path
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#define CMND_STR L"{}!&|~*@#()[],=<> \t\n\""
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// chars that cannot appear outside of the <> braces in a regex
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#define REGEX_STR L"&|~()[], \n"
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// chars that cannot appear in an unquoted column name
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#define COLUMN_STR L"{}!&|~*@#()[],=<>+%$^{}:;'./?\\` \t\n\""
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//+---------------------------------------------------------------------------
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//
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// Class: CQueryScanner
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//
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// Purpose: Scans the input from the property list file, the startup
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// file and the console.
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//
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// History: 29-Apr-92 AmyA Created.
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//
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//----------------------------------------------------------------------------
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class CQueryScanner
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{
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public:
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CQueryScanner( WCHAR const * buffer,
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BOOL fLookForTextualKeywords,
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LCID lcid = GetUserDefaultLCID(),
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BOOL fTreatPlusAsToken = FALSE );
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Token LookAhead() { return _token; }
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void Accept();
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void AcceptWord();
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void AcceptColumn();
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void AcceptQuote() { Win4Assert( L'"' == *_text ); _text++; }
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void AcceptCommand();
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BOOL IsEmpty() { return ( _token == EOS_TOKEN ); }
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WCHAR* AcqPath();
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WCHAR* AcqWord();
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WCHAR* AcqColumn();
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WCHAR* AcqPhrase();
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WCHAR* AcqLine( BOOL fParseQuotes = TRUE );
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WCHAR* AcqRegEx();
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WCHAR* AcqPhraseInQuotes();
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BOOL GetNumber( ULONG & number, BOOL & fAtEndOfString );
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BOOL GetNumber( LONG & number, BOOL & fAtEndOfString );
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BOOL GetNumber( unsigned _int64 & number, BOOL & fAtEndOfString );
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BOOL GetNumber( _int64 & number, BOOL & fAtEndOfString );
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BOOL GetNumber( double & number );
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WCHAR GetCommandChar();
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void ResetBuffer( WCHAR const * buffer );
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ULONG CurrentOffset()
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{
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return CiPtrToUlong( _text - _pBuf );
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}
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private:
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WCHAR * AllocReturnString( int cch );
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void EatWhiteSpace();
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WCHAR * FindStringToken( WCHAR * pwcIn, Token & token, unsigned & cwc );
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BOOL IsEndOfTextToken();
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WCHAR const * _pBuf;
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WCHAR const * _pLookAhead;
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WCHAR const * _text;
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Token _token;
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BOOL _fLookForTextualKeywords;
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BOOL _fTreatPlusAsToken;
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LCID _lcid;
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};
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