htmlstripper.cpp

来自「Think in C++ 2nd」· C++ 代码 · 共 50 行

//: C17:HTMLStripper.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Filter to remove html tags and markers
#include "../require.h"
#include <fstream>
#include <iostream>
#include <string>
using namespace std;

string replaceAll(string s, string f, string r) {
  unsigned int found = s.find(f);
  while(found != string::npos) {
    s.replace(found, f.length(), r);
    found = s.find(f);
  }
  return s;
}

string stripHTMLTags(string s) {
  while(true) {
    unsigned int left = s.find('<');
    unsigned int right = s.find('>');
    if(left==string::npos || right==string::npos)
      break;
    s = s.erase(left, right - left + 1);
  }
  s = replaceAll(s, "&lt;", "<");
  s = replaceAll(s, "&gt;", ">");
  s = replaceAll(s, "&amp;", "&");
  s = replaceAll(s, "&nbsp;", " ");
  // Etc...
  return s;
}

int main(int argc, char* argv[]) {
  requireArgs(argc, 1, 
    "usage: HTMLStripper InputFile");
  ifstream in(argv[1]);
  assure(in, argv[1]);
  const int sz = 4096;
  char buf[sz];
  while(in.getline(buf, sz)) {
    string s(buf);
    cout << stripHTMLTags(s) << endl;
  }
} ///:~