www.gusucode.com > C++ Primer 书籍源代码源码程序 > C++ Primer 书籍源代码源码程序/code/10/3ed_querymain.cpp
//Download by http://www.NewXing.com /* * 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; }