TextQuery.h
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上传日期:2022-06-29
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书籍源码
开发平台:
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
- */
- #ifndef TEXTQUERY_H
- #define TEXTQUERY_H
- #include <string>
- #include <vector>
- #include <map>
- #include <set>
- #include <iostream>
- #include <fstream>
- #include <cctype>
- #include <cstring>
- class TextQuery {
- // as before
- public:
- // typedef to make declarations easier
- typedef std::string::size_type str_size;
- typedef std::vector<std::string>::size_type line_no;
- /* interface:
- * read_file builds internal data structures for the given file
- * run_query finds the given word and returns set of lines on which it appears
- * text_line returns a requested line from the input file
- */
- void read_file(std::ifstream &is)
- { store_file(is); build_map(); }
- std::set<line_no> run_query(const std::string&) const;
- std::string text_line(line_no) const;
- str_size size() const { return lines_of_text.size(); }
- void display_map(); // debugging aid: print the map
- private:
- // utility functions used by read_file
- void store_file(std::ifstream&); // store input file
- void build_map(); // associated each word with a set of line numbers
- // remember the whole input file
- std::vector<std::string> lines_of_text;
- // map word to set of the lines on which it occurs
- std::map< std::string, std::set<line_no> > word_map;
- // characters that constitute whitespace
- static std::string whitespace_chars;
- // canonicalizes text: removes punctuation and makes everything lower case
- static std::string cleanup_str(const std::string&);
- };
- #endif