| 1 | /**************************************************************************
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| 2 | *
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| 3 | * GSDLQueryLex.h -- Lexical analyser for a simple query language, for GSDL
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| 4 | * Copyright (C) 2000 Rodger McNab
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| 5 | *
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| 6 | * This program is free software; you can redistribute it and/or modify
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| 7 | * it under the terms of the GNU General Public License as published by
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| 8 | * the Free Software Foundation; either version 2 of the License, or
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| 9 | * (at your option) any later version.
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| 10 | *
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| 11 | * This program is distributed in the hope that it will be useful,
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | * GNU General Public License for more details.
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| 15 | *
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| 16 | * You should have received a copy of the GNU General Public License
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| 17 | * along with this program; if not, write to the Free Software
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| 18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 19 | *
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| 20 | * $Id: GSDLQueryLex.h 1127 2000-04-18 04:09:11Z kjm18 $
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| 21 | *
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| 22 | **************************************************************************/
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| 23 |
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| 24 | #ifndef GSDLQUERYLEX_H
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| 25 | #define GSDLQUERYLEX_H
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| 26 |
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| 27 | #include "UCArray.h"
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| 28 |
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| 29 |
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| 30 | // note: white space is ignored
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| 31 | enum LexType {NoTypeE, OpenBracketE, CloseBracketE, TermE, AndOpE, OrOpE,
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| 32 | NotOpE, NearOpE, QuoteE, IntegerE, TermWeightE, StemMethodE,
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| 33 | RangeE, AtE, TagE, OpenSquareBracketE, CloseSquareBracketE};
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| 34 |
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| 35 | struct LexEl {
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| 36 | LexType lexType;
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| 37 | UCArray text;
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| 38 | int num; // for IntegerE
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| 39 |
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| 40 | void Clear () {
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| 41 | lexType = NoTypeE;
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| 42 | UCArrayClear (text);
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| 43 | num = 0;
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| 44 | }
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| 45 | LexEl () { Clear (); }
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| 46 | };
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| 47 |
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| 48 |
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| 49 | // returns true if another lexical element could be parsed.
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| 50 | bool ParseLexEl (UCArray::const_iterator &here,
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| 51 | UCArray::const_iterator end,
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| 52 | LexEl &el);
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| 53 |
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| 54 |
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| 55 | #endif
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| 56 |
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