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desolator888 2014-04-15
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这个题蛮复杂的：源CPP，作用是消除一个文件中的标签，例如
一个文件中的内容是
<sda>dad</sd>sda
<sdaf
sdd>dsf<sdsd><sddsd
sds
>sdds
结果会显示
dadsda
dsf
sdds 下面的源程序看懂就得好久
#include <cassert>
#include <cmath>
#include <cstddef>
#include <fstream>
#include <iostream>
#include <string>
using namespace std;
string& stripHTMLTags(string& s) {
static bool inTag = false;
bool done = false;
while(!done) {
if(inTag) {
// The previous line started an HTML tag
// but didn't finish. Must search for '>'.
size_t rightPos = s.find('>');
if(rightPos != string::npos) {
inTag = false;
s.erase(0, rightPos + 1);
}
else {
done = true;
s.erase();
}
}
else {
// Look for start of tag:
size_t leftPos = s.find('<');
if(leftPos != string::npos) {
// See if tag close is in this line:
size_t rightPos = s.find('>');
if(rightPos == string::npos) {
inTag = done = true;
s.erase(leftPos);
}
else
s.erase(leftPos, rightPos - leftPos + 1);
}
else
done = true;
}
}
return s;
}
int main(int argc, char* argv[]) {
ifstream in(argv[1]);
string s;
while(getline(in, s))
if(!stripHTMLTags(s).empty())
cout << s << endl;
} ///:~
题目是
Modify HTMLStripper.cpp so that when it encounters a tag, it displays the tag’s name, then displays the file’s contents between the tag and the file’s ending tag. Assume no nesting of tags, and that all tags have ending tags (denoted with </TAGNAME>).
大致就是说
<body>sdd
</body>dsafkl<head>dss</head>
要能显示
body:
ssdd
head:
dss
wulathink 2014-04-14
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木有但是可以拿出来讨论下啊
