怎么做带逻辑符的文本搜索呢?求指教
如要实现输入 hello || hi ,则显示有hello或者hi的行
输入!hello则显示没有hello的行
在程序哪里改呢,新手求教,谢谢
#pragma warning(disable: 4786)
#include <string>
#include <vector>
#include <map>
#include <set>
#include <iostream>
#include <fstream>
#include <sstream>
using namespace std;
class Text {
public:
typedef string::size_type str_size;
typedef vector<string>::size_type line_no;
void read_file(ifstream &is)
{
store_file(is);
build_map();
}
set<line_no> run_(const string&) const;
string text_line(line_no) const;
str_size size() const { return lines_of_text.size(); }
void show_map();
private:
void store_file(ifstream&);
void build_map();
vector<string> lines_of_text;
map< string, set<line_no> > word_map;
static string cleanup_str(const string&);
};
string Text::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");
}
void Text::store_file(ifstream &is)
{
string textline;
while (getline(is, textline))
lines_of_text.push_back(textline);
}
void Text::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[cleanup_str(word)].insert(line_num);
}
}
set<Text::line_no>
Text::run_(const string &_word) const
{
map<string, set<line_no> >::const_iterator
loc = word_map.find(cleanup_str(_word));
if (loc == word_map.end())
return set<line_no>();
else
return loc->second;
}
void Text::show_map()
{
map< string, set<line_no> >::iterator iter = word_map.begin(),
iter_end = word_map.end();
for ( ; iter != iter_end; ++iter)
{
cout << "word: " << iter->first << " {";
const set<line_no> &text_locs = iter->second;
set<line_no>::const_iterator loc_iter = text_locs.begin(),
loc_iter_end = text_locs.end();
while (loc_iter != loc_iter_end)
{
cout << *loc_iter;
if (++loc_iter != loc_iter_end)
cout << ", ";
}
cout << "}\n";
}
cout << endl;
}
string Text::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;
}
void print_results(const set<Text::line_no>& locs, const string& sought, const Text &file)
{
typedef set<Text::line_no> line_nums;
line_nums::size_type size = locs.size();
cout << "\n" << sought << " 出现了 "
<< size << " "
<< "次" << endl;
line_nums::const_iterator it = locs.begin();
for ( ; it != locs.end(); ++it) {
cout << "\t(在第 "
<< (*it) + 1 << " 行) "
<< file.text_line(*it) << endl;
}
}
ifstream& open_file(ifstream &in, const string &file)
{
in.close();
in.clear();
in.open(file.c_str());
return in;
}
int main()
{
ifstream in;
string s;
//cout << "请输入文本路径:\n";
//cin >> s;
if (!open_file(in, "c:\\1.txt"))
{
cout << "打开失败,检查重试!" << endl;
system("pause");
return 0;
}
Text tq;
tq.read_file(in);
while (true)
{
cout << "\t你要找的是\n ( exit! 退出程序 ): ";
cin >> s;
if (!cin || s == "exit!") break;
set<Text::line_no> locs = tq.run_(s);
print_results(locs, s, tq);
cout << "\n";
system("pause");
system("cls");
}
return 1;
}