mirror of
https://github.com/rn10950/RetroZilla.git
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141 lines
6.0 KiB
C++
141 lines
6.0 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Howard Chu <hyc@symas.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsMsgSearchCore.h"
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#ifndef __nsMsgSearchBoolExpression_h
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#define __nsMsgSearchBoolExpression_h
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//-----------------------------------------------------------------------------
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// nsMsgSearchBoolExpression is a class added to provide AND/OR terms in search queries.
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// A nsMsgSearchBoolExpression contains either a search term or two nsMsgSearchBoolExpressions and
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// a boolean operator.
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// I (mscott) am placing it here for now....
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//-----------------------------------------------------------------------------
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/* CBoolExpression --> encapsulates one or more search terms by internally
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representing the search terms and their boolean operators as a binary
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expression tree. Each node in the tree consists of either
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(1) a boolean operator and two nsMsgSearchBoolExpressions or
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(2) if the node is a leaf node then it contains a search term.
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With each search term that is part of the expression we may also keep
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a character string. The character
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string is used to store the IMAP/NNTP encoding of the search term. This
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makes generating a search encoding (for online) easier.
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For IMAP/NNTP: nsMsgSearchBoolExpression has/assumes knowledge about how
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AND and OR search terms are combined according to IMAP4 and NNTP protocol.
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That is the only piece of IMAP/NNTP knowledge it is aware of.
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Order of Evaluation: Okay, the way in which the boolean expression tree
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is put together directly effects the order of evaluation. We currently
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support left to right evaluation.
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Supporting other order of evaluations involves adding new internal add
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term methods.
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*/
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class nsMsgSearchBoolExpression
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{
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public:
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// create a leaf node expression
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nsMsgSearchBoolExpression(nsIMsgSearchTerm * aNewTerm,
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char * aEncodingString = NULL);
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// create a non-leaf node expression containing 2 expressions
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// and a boolean operator
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nsMsgSearchBoolExpression(nsMsgSearchBoolExpression *,
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nsMsgSearchBoolExpression *,
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nsMsgSearchBooleanOperator boolOp);
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nsMsgSearchBoolExpression();
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~nsMsgSearchBoolExpression(); // recursively destroys all sub
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// expressions as well
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// accessors
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// Offline
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static nsMsgSearchBoolExpression * AddSearchTerm (nsMsgSearchBoolExpression * aOrigExpr, nsIMsgSearchTerm * aNewTerm, char * aEncodingStr); // IMAP/NNTP
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static nsMsgSearchBoolExpression * AddExpressionTree(nsMsgSearchBoolExpression * aOrigExpr, nsMsgSearchBoolExpression * aExpression, PRBool aBoolOp);
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// parses the expression tree and all
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// expressions underneath this node to
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// determine if the end result is PR_TRUE or PR_FALSE.
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PRBool OfflineEvaluate(nsIMsgDBHdr *msgToMatch,
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const char *defaultCharset, nsIMsgSearchScopeTerm *scope,
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nsIMsgDatabase *db, const char *headers, PRUint32 headerSize,
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PRBool Filtering);
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// assuming the expression is for online
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// searches, determine the length of the
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// resulting IMAP/NNTP encoding string
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PRInt32 CalcEncodeStrSize();
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// fills pre-allocated
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// memory in buffer with
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// the IMAP/NNTP encoding for the expression
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void GenerateEncodeStr(nsCString * buffer);
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// if we are not a leaf node, then we have two other expressions
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// and a boolean operator
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nsMsgSearchBoolExpression * m_leftChild;
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nsMsgSearchBoolExpression * m_rightChild;
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nsMsgSearchBooleanOperator m_boolOp;
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protected:
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// if we are a leaf node, all we have is a search term
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nsIMsgSearchTerm * m_term;
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// store IMAP/NNTP encoding for the search term if applicable
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nsCString m_encodingStr;
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// internal methods
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// the idea is to separate the public interface for adding terms to
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// the expression tree from the order of evaluation which influences
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// how we internally construct the tree. Right now, we are supporting
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// left to right evaluation so the tree is constructed to represent
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// that by calling leftToRightAddTerm. If future forms of evaluation
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// need to be supported, add new methods here for proper tree construction.
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nsMsgSearchBoolExpression * leftToRightAddTerm(nsIMsgSearchTerm * newTerm,
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char * encodingStr);
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};
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#endif
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