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#ifndef TEXTQUERY_H
#define TEXTQUERY_H
#include <string>
#include <vector>
#include <map>
#include <cctype>
#include <iostream>
#include <cstring> #include <fstream>
using namespace std;
class TextQuery{
public:
//类型别名
typedef string::size_type str_size;
typedef vector<string>::size_type line_no;
//接口:
//read_file建立建立给定文件的内部数据结构
void read_file(ifstream &is){
store_file(is); build_map();
}
//run_query查询给定单词并返回该单词所在行的行号集合
vector<line_no> run_query(const string&) const;
//text_line返回输入文件中指定行号对应的行
string text_line(line_no) const;
private:
//read_file使用的辅助函数
void store_file(ifstream&); //存储输入文件
void build_map(); //将每个单词与一个行号集合相关联
//保存输入文件
vector<string> lines_of_text;
//将单词与出现该单词的行号集合相关联
map< string, vector<line_no> > word_map;
//去掉标点并把字母变成小写
static std::string cleanup_str(const std::string&);
};
#endif
#include "TextQuery.h"
#include <sstream>
string TextQuery::text_line(line_no line) const
{
if(line < lines_of_text.size())
return lines_of_text[line];
throw out_of_range("line number out of range");
}
//读输入文件,将每行存储为lines_of_text的一个元素
void TextQuery::store_file(ifstream &is)
{
string textline;
while(getline(is,textline))
lines_of_text.push_back(textline);
}
//在输入vector中找以空白为间隔的单词
//将单词以及出现该单词的行的行号一起放入word_map
void TextQuery::build_map()
{
//处理输入vector中的每一行
for(line_no line_num = 0;line_num != lines_of_text.size(); ++line_num)
{
//一次读入一个单词
istringstream line(lines_of_text[line_num]);
string word;
while(line >> word){
// 去掉标点
word = cleanup_str(word);
//将行号加入到vector容器中
if(word_map.count(word) == 0 ) //单词不在容器中
//利用下标操作将此单词加入
word_map[word].push_back(line_num);
else{ //单词已在map容器中
if(line_num != word_map[word].back())
//行号与vector容器中最后一个元素不相等
word_map[word].push_back(line_num);
}
}
}
}
//查询函数,返回单词所在的行号组成的set集
vector<TextQuery::line_no> TextQuery::run_query(const string &query_word) const
{
//注意,为了避免在word_map中加入单词,使用find函数而不用下标操作
map<string,vector<line_no> >::const_iterator loc = word_map.find(query_word);
if(loc == word_map.end())
return vector<line_no>(); //找不到,返回空的vector对象
else
//获取并返回该单词关联的行号vector对象
return loc->second;
}
//去掉标点,并将字母变为小写的函数
string TextQuery::cleanup_str(const string &word)
{
string ret;
for(string::const_iterator it = word.begin();
it != word.end(); ++it)
{
if(!ispunct(*it))
ret += tolower(*it);
}
return ret;
}
#include <fstream>
#include <string>
using namespace std;
string make_plural(size_t ctr,const string &word,const string &ending)
{
return (ctr == 1) ? word : word + ending;
}
ifstream& open_file(ifstream &in,const string &file)
{
in.close();
in.clear();
in.open(file.c_str());
return in;
}
#include <fstream>
#include <string>
using namespace std;
string make_plural(size_t ctr,const string &word,const string &ending)
{
return (ctr == 1) ? word : word + ending;
}
ifstream& open_file(ifstream &in,const string &file)
{
in.close();
in.clear();
in.open(file.c_str());
return in;
}
#include "TextQuery.h"
string make_plural(size_t, const string &word, const string &ending);
ifstream& open_file(ifstream&,const string&);
void print_results(const vector<TextQuery::line_no>& locs,
const string& sought,const TextQuery &file)
{
//如果找到单词sought,则输出该单词出现的行数
typedef vector<TextQuery::line_no> line_nums;
line_nums::size_type size = locs.size();
cout << "\n" << sought << " occurs " << size << " " << make_plural(size,"time","s") << endl;
//输出出现该单词的每一行
line_nums::const_iterator it = locs.begin();
for(; it != locs.end(); ++it){
cout << "\t(line "
//行号从1开始
<< (*it) + 1 << ") "
<< file.text_line(*it) << endl;
}
}
//main函数接受文件名为参数
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); //建立map容器
//循环接受用户的查询要求并输出结果
while(true){
cout << "Enter word to look for, or q to quit: ";
string s;
cin >> s;
//将s变小写
string ret;
for (string::const_iterator it = s.begin(); it != s.end(); ++it){
ret += tolower(*it);
}
s = ret;
//如果用户输入文件结束符或字符'q'及'Q',则结束循环
if ( !cin || s == "q" || s == "Q") break;
//获取出现所查询单词所有行的行号
vector<TextQuery::line_no> locs = tq.run_query(s);
//输出出现次数及所有相关文本行
print_results(locs,s,tq);
}
return 0;
}
/*TextQuery.h*/
#include <iostream>
#include <vector>
#include <map>
#include <set>
#include <string>
using namespace std;
class TextQuery
{
public:
typedef vector< string >::size_type line_no;
typedef map< string,set<line_no> >::iterator map_word_iterator;
void read_file(ifstream &is)
{
store_file(is);
build_map();
}
set< line_no > run_query(const string &) const;
string text_line(line_no) const;
private:
void store_file(ifstream &);
void build_map();
vector< string > lines_of_text;
map< string,set< line_no > > word_map;
};
/*TextQuery.cpp*/
#pragma warning(disable:4786)
#include <iostream>
#include <fstream>
#include <sstream>
#include <vector>
#include <map>
#include <set>
#include <string>
#include "textQuery.h"
using namespace std;
void TextQuery::store_file(ifstream &is)
{
string textline;
while (getline(is, textline))
lines_of_text.push_back(textline);
}
void TextQuery::build_map()
{
for(line_no line_num = 0; line_num != lines_of_text.size(); ++line_num)
{
istringstream line(lines_of_text[line_num]);
string word;
while (line >>word)
word_map[word].insert(line_num);
}
}
set< TextQuery::line_no > TextQuery::run_query(const string &query_word) const
{
map< string, set< line_no > >::const_iterator loc = word_map.find(query_word);
if (loc == word_map.end())
return set<line_no>();
else
return loc->second;
}
string TextQuery::text_line(line_no line) const
{
if (line <lines_of_text.size())
return lines_of_text[line];
throw out_of_range("line number out of ranger");
}
/*main.cpp*/
#pragma warning(disable:4786)
#include <iostream>
#include <fstream>
#include <sstream>
#include <vector>
#include <map>
#include <set>
#include <string>
#include "textQuery.h"
using namespace std;
typedef set<TextQuery::line_no> line_nums;
void print_results(const set<TextQuery::line_no> &locs, const string &sought, const TextQuery &file);
ifstream& open_file(ifstream &in, const string &file);
int main()
{
ifstream infile;
if ( !open_file(infile, "text_in.txt") )
{
cerr << "No input file!" << endl;
return EXIT_FAILURE;
}
TextQuery tq;
tq.read_file(infile);
while (true)
{
cout << "enter word to look for,or q for qiut: ";
string s;
cin >> s;
if(!cin || s == "q")
break;
set<TextQuery::line_no> locs =tq.run_query(s);
print_results(locs, s, tq);
}
return 0;
}
void print_results(const set<TextQuery::line_no> &locs, const string &sought, const TextQuery &file)
{
line_nums::size_type size = locs.size();
cout << "\n" <<sought << " occurs " << size << " " <</*make_plural(size, "time" , "s") <<*/endl;
line_nums::const_iterator it = locs.begin();
for( ; it != locs.end(); ++it)
{
cout <<"\t(line " << (*it) +1 << ")" <<file.text_line(*it) <<endl;
}
}
ifstream& open_file(ifstream &in, const string &file)
{
in.close();
in.clear();
in.open(file.c_str());
return in;
}