3ed_querymain.cpp
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上传日期:2022-06-29
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书籍源码
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Visual C++
- /*
- * This file contains code from "C++ Primer, Fourth Edition", by Stanley B.
- * Lippman, Jose Lajoie, and Barbara E. Moo, and is covered under the
- * copyright and warranty notices given in that book:
- *
- * "Copyright (c) 2005 by Objectwrite, Inc., Jose Lajoie, and Barbara E. Moo."
- *
- *
- * "The authors and publisher have taken care in the preparation of this book,
- * but make no expressed or implied warranty of any kind and assume no
- * responsibility for errors or omissions. No liability is assumed for
- * incidental or consequential damages in connection with or arising out of the
- * use of the information or programs contained herein."
- *
- * Permission is granted for this code to be used for educational purposes in
- * association with the book, given proper citation if and when posted or
- * reproduced.Any commercial use of this code requires the explicit written
- * permission of the publisher, Addison-Wesley Professional, a division of
- * Pearson Education, Inc. Send your request for permission, stating clearly
- * what code you would like to use, and in what specific way, to the following
- * address:
- *
- * Pearson Education, Inc.
- * Rights and Contracts Department
- * 75 Arlington Street, Suite 300
- * Boston, MA 02216
- * Fax: (617) 848-7047
- */
- #include "3ed_query.h"
- #include <string>
- #include <vector>
- #include <map>
- #include <set>
- #include <iostream>
- #include <fstream>
- #include <cctype>
- #include <cstring>
- using std::set;
- using std::string;
- using std::map;
- using std::vector;
- using std::cerr;
- using std::cout;
- using std::cin;
- using std::ifstream;
- using std::endl;
- using std::pair;
- using std::make_pair;
- ifstream& open_file(ifstream&, const string&);
- int main(int argc, char **argv)
- {
- if (argc != 2) {cerr << "No input file" << endl; return -2;}
- // get a file to read from which user will query words
- ifstream infile;
- if (!open_file(infile, argv[1])) {
- cerr << "No input file!" << endl;
- return -1;
- }
- TextQuery tq;
- tq.read_file(infile); // builds query map
- // iterate with the user: prompt for a word to find and print results
- string sought;
- do {
- cout << "enter a word against which to search the text.n"
- << "to quit, enter a single character ==> ";
- cin >> sought;
- // stop if hit eof on input or single character entered
- if (!cin || sought.size() < 2) break;
- // find all the occurrences of the users requested string
- vector<TextQuery::location> locs = tq.run_query(sought);
- // report no matches
- if (locs.empty()) {
- cout << "nSorry. There are no entries for "
- << sought << ".nTry again." << endl;
- continue;
- }
- // if the word was found, then print count and all occurrences
- vector<TextQuery::location>::size_type size = locs.size();
- cout << "n" << sought << " occurs " << size
- << (size == 1 ? " time:" : " times:")
- << "n" << endl;
- // print each line in which the word appeared
- vector<TextQuery::location>::iterator it = locs.begin();
- while (it != locs.end()) {
- cout << "t(line: "
- // don't confound user with text lines starting at 0
- << it->first + 1 << ", pos: " << it->second + 1 << ") "
- << tq.text_line(it->first) << endl;
- ++it;
- }
- } while (!sought.empty());
- cout << "Ok, bye!" << endl;
- // debugging aid -- look at the map that was built
- tq.display_map();
- return 0;
- }