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 "TextQuery.h"
- #include <string>
- #include <vector>
- #include <map>
- #include <set>
- #include <iostream>
- #include <fstream>
- #include <cctype>
- #include <cstring>
- #include <cstdlib>
- 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;
- string make_plural(size_t, const string&, const string&);
- ifstream& open_file(ifstream&, const string&);
- void print_results(const set<TextQuery::line_no>& locs,
- const string& sought, const TextQuery &file)
- {
- // if the word was found, then print count and all occurrences
- typedef set<TextQuery::line_no> line_nums;
- line_nums::size_type size = locs.size();
- cout << "n" << sought << " occurs "
- << size << " "
- << make_plural(size, "time", "s") << endl;
- // print each line in which the word appeared
- line_nums::const_iterator it = locs.begin();
- for ( ; it != locs.end(); ++it) {
- cout << "t(line "
- // don't confound user with text lines starting at 0
- << (*it) + 1 << ") "
- << file.text_line(*it) << endl;
- }
- }
- // program takes single argument specifying the file to query
- int main(int argc, char **argv)
- {
- // open the file from which user will query words
- ifstream infile;
- if (argc < 2 || !open_file(infile, argv[1])) {
- cerr << "No input file!" << endl;
- return EXIT_FAILURE;
- }
- TextQuery tq;
- tq.read_file(infile); // builds query map
- // iterate with the user: prompt for a word to find and print results
- // loop indefinitely; the loop exit is inside the while
- while (true) {
- cout << "enter word to look for, or q to quit: ";
- string s;
- cin >> s;
- // stop if hit eof on input or a 'q' is entered
- if (!cin || s == "q") break;
- // get the set of line numbers on which this word appears
- set<TextQuery::line_no> locs = tq.run_query(s);
- // print count and all occurrences, if any
- print_results(locs, s, tq);
- }
- return 0;
- }