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/* ============================================================================ |
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* Douglas Thrift's Search Engine License |
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* |
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* Copyright (C) 2002-2003, Douglas Thrift. All Rights Reserved. |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright notice, |
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* this list of conditions and the following disclaimer in the documentation |
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* and/or other materials provided with the distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, if any, must |
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* include the following acknowledgment: |
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* |
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* "This product includes software developed by Douglas Thrift |
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* (http://computers.douglasthrift.net/searchengine/)." |
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* |
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* Alternately, this acknowledgment may appear in the software itself, if |
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* and wherever such third-party acknowledgments normally appear. |
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* |
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* 4. The names "Douglas Thrift" and "Douglas Thrift's Search Engine" must not |
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* be used to endorse or promote products derived from this software without |
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* specific prior written permission. For written permission, please visit |
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* http://www.douglasthrift.net/contact.cgi for contact information. |
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* |
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* 5. Products derived from this software may not be called "Douglas Thrift's |
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* Search Engine", nor may "Douglas Thrift's Search Engine" appear in their |
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* name, without prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, |
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* ============================================================================ |
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*/ |
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// Douglas Thrift's Search Engine Searcher |
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// |
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// Douglas Thrift |
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// |
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// Searcher.cpp |
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|
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#include "Searcher.h" |
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|
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Searcher::Searcher(string& queryString) |
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{ |
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setCommon(); |
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setAnd(false); |
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setOr(false); |
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|
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this->queryString = queryString; |
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|
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setQuery(); |
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} |
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|
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void Searcher::search(vector<string> indices) |
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{ |
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start = clock(); |
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|
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const string XMLTYPE = "<?xml version=\"1.0\" encoding=\"ISO-8859-1\" stan" |
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+ string("dalone=\"no\"?>"); |
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const string DOCTYPE = "<!DOCTYPE index SYSTEM \"index.dtd\">"; |
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|
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if (query.size() > 0) |
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{ |
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for (int index = 0; index < indices.size(); index++) |
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{ |
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string lock = indices[index] + ".lock"; |
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|
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ifstream fin(lock.c_str()); |
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|
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if (fin.is_open()) |
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{ |
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cerr << program << ": Index file is locked for indexing: " |
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<< indices[index] << "\n"; |
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fin.close(); |
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|
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continue; |
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} |
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|
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fin.clear(); |
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fin.open(indices[index].c_str()); |
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|
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if (!fin.is_open()) |
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{ |
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cerr << program << ": Could not open index file: " |
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<< indices[index] << "\n"; |
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fin.clear(); |
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|
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continue; |
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} |
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|
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string line; |
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|
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getline(fin, line); |
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if (line != XMLTYPE) |
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{ |
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cerr << program << ": Invalid XML version declaration: " |
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<< indices[index] << "\n"; |
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fin.close(); |
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fin.clear(); |
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|
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continue; |
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} |
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|
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getline(fin, line); |
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if (line != DOCTYPE) |
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{ |
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cerr << program << ": Invalid XML doctype: " << indices[index] |
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<< "\n"; |
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fin.close(); |
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fin.clear(); |
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continue; |
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} |
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|
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getline(fin, line); |
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if (line != "<index>") |
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{ |
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cerr << program << ": Invalid XML root element: " |
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<< indices[index] << "\n"; |
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fin.close(); |
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fin.clear(); |
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continue; |
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} |
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|
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while (fin.good()) |
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{ |
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Page page; |
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|
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fin >> page; |
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|
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if (!page.empty()) search(page); |
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} |
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|
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fin.close(); |
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fin.clear(); |
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} |
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} |
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|
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finish = clock(); |
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} |
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|
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void Searcher::search(Page& page) |
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{ |
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Ranker ranker(page); |
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ranker.rank(query); |
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|
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if (ranker != 0) |
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{ |
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ranker.setSample(); |
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pages.insert(ranker); |
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} |
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} |
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|
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void Searcher::setQuery() |
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{ |
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string queryStringNormal = queryString; |
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normalize(queryStringNormal); |
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|
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if (debug) cerr << "queryString = " << queryString << "\n" |
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<< "queryStringNormal = " << queryStringNormal << "\n"; |
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|
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unsigned begin = 0; |
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bool capitalOr = false, quotes = false; |
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while (begin < queryStringNormal.length()) |
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{ |
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string word; |
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|
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unsigned beginQuote = queryStringNormal.find('\"', begin); |
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unsigned endQuote = beginQuote != string::npos ? |
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queryStringNormal.find('\"', beginQuote + 1) : string::npos; |
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unsigned space = queryStringNormal.find(' ', begin); |
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|
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if (beginQuote == begin) |
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{ |
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quotes = true; |
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word = queryStringNormal.substr(beginQuote + 1, endQuote - |
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beginQuote - 1); |
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} |
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else if (beginQuote == (begin + 8) && queryStringNormal.substr(begin, 8 |
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) == "intitle:") |
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{ |
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quotes = true; |
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word = "intitle:" + queryStringNormal.substr(beginQuote + 1, |
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endQuote - beginQuote - 1); |
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beginQuote = begin; |
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} |
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else if (beginQuote == (begin + 6) && queryStringNormal.substr(begin, 6 |
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) == "inurl:") |
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{ |
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quotes = true; |
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word = "inurl:" + queryStringNormal.substr(beginQuote + 1, endQuote |
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- beginQuote - 1); |
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beginQuote = begin; |
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} |
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else if (beginQuote == (begin + 7) && queryStringNormal.substr(begin, 7 |
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) == "intext:") |
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{ |
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quotes = true; |
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word = "intext:" + queryStringNormal.substr(beginQuote + 1, |
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endQuote - beginQuote - 1); |
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beginQuote = begin; |
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} |
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else |
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{ |
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quotes = false; |
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word = queryStringNormal.substr(begin, space - begin); |
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} |
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|
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if (word != "") |
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{ |
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string lowerWord(word.length(), ' '); |
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|
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for (unsigned index = 0; index < word.length(); index++) |
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{ |
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lowerWord[index] = tolower(word[index]); |
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} |
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|
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if (debug) cerr << "word = " << word << "\n" |
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<< "lowerWord = " << lowerWord << "\n"; |
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|
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if (word == "OR" && !quotes) |
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{ |
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capitalOr = true; |
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query[query.size() - 1] += " OR"; |
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} |
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else if (lowerWord == "or" && !quotes) |
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{ |
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setOr(true); |
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} |
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else if (lowerWord == "and" && !quotes) |
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{ |
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setAnd(true); |
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} |
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else if (common.find(lowerWord) != common.end() && !quotes) |
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{ |
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commonUsed.push_back(word); |
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} |
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else |
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{ |
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if (capitalOr) capitalOr = false; |
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if (query.size() < 10) |
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{ |
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query.push_back(lowerWord); |
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} |
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else |
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{ |
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setIgnore(lowerWord); |
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|
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if (debug) cerr << "ignore = " << ignore << "\n"; |
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|
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break; |
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} |
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} |
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} |
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|
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if (endQuote == string::npos && space == string::npos) |
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{ |
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begin = string::npos; |
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} |
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else if (beginQuote == begin && endQuote != string::npos) |
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{ |
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begin = endQuote + 1; |
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} |
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else |
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{ |
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begin = space + 1; |
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} |
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} |
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|
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if (debug) |
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{ |
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cerr << "query = {\n"; |
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|
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for (unsigned index = 0; index < query.size(); index++) |
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{ |
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cerr << " [" << index << "] = " << query[index] << "\n"; |
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} |
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|
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cerr << "}\n"; |
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} |
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} |
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|
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void Searcher::setCommon() |
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{ |
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common.insert("&"); |
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common.insert("a"); |
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common.insert("about"); |
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common.insert("an"); |
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// "and" has its own special message |
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// common.insert("and"); |
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common.insert("are"); |
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common.insert("as"); |
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common.insert("at"); |
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common.insert("be"); |
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common.insert("by"); |
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common.insert("com"); |
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common.insert("from"); |
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common.insert("how"); |
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common.insert("i"); |
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common.insert("in"); |
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common.insert("is"); |
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common.insert("it"); |
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common.insert("of"); |
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common.insert("on"); |
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// "or" has its own special message |
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// common.insert("or"); |
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common.insert("that"); |
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common.insert("the"); |
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common.insert("this"); |
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common.insert("to"); |
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common.insert("was"); |
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common.insert("what"); |
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common.insert("when"); |
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common.insert("where"); |
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common.insert("which"); |
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common.insert("who"); |
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common.insert("why"); |
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common.insert("will"); |
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common.insert("with"); |
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} |
