Hi guys.
Im doing an assignment, I am getting on ok with it but I am sadly really stuck at the moment.
The part I am stuck on involves counting html tags in a text file. I have thought of a method of doing this but unfortunately I have no idea how to implement it into the code. My idea is to look for the start symbol of the tag( <) then the contents, then the end symbol (>) Does anyone know how I could do this in c++?
Many thanks
Mat
Jump to PostYou could just go through the file and when your program comes across a '<' it should just ignore everything after it until it comes across a '>', at that point you've to count a tag ...
Jump to Postprobably something like this:
std::string str = "<html>"; if( str.find("<") != string::npos && str.find(">") != string::npos) { // most likely an html tag }
Jump to PostShow us the code, with CODE TAGS.
Jump to Postwhy not just use getline() to read an entire line at one time?
std::string line; while( getline(ipfile, line) ) { // blabla }I don't do html coding, but I think any given tag must be on one line, such as "<html>" can not be split between …
You could just go through the file and when your program comes across a '<' it should just ignore everything after it until it comes across a '>', at that point you've to count a tag ...
probably something like this:
std::string str = "<html>";
if( str.find("<") != string::npos && str.find(">") != string::npos)
{
// most likely an html tag
}Thanks alot guys :) i'll try these ideas out.
Dragon I had a stab at using your technique but it returns a random number of tags in the output. :(
Show us the code, with CODE TAGS.
// assignment program
// read file and copy to another
// count amount of charecters,lines, comments and tags
// change Xhtml tags from upper case to lower case
// place in new file
#include <iostream>
#include <fstream>
#include <string>
#include <cstring>
#include <iomanip>
#include <cctype>
using namespace std;
int main()
{
string file1,file2;
string str = "<>";
ifstream ipfile;
ofstream opfile;
char c;
int amountline = 0;
int amountcha = 0;
int amounttag = 0;
int amountcomment = 0;
cout << "Please enter the name of the file you wish to check" << endl;
cin >> file1;
ipfile.open(file1.c_str());
if (!ipfile.is_open())
{
cout << "Oops! Couldn't open " << file1 << "!\n"<<endl;
return 1;
}
{
cout << " Please enter the file you wish the edited contents to be copied to" << endl;
cout << " This will be created if it does not already exist"<< endl;
cin >> file2;
}
opfile.open(file2.c_str());
while (!ipfile.eof())
{
ipfile.get(c);
opfile << c;
if(c!='\n' && !ipfile.eof() && c!=' ')
{
amountcha++;
}
if(c=='\n')
{
amountline++;
}
if( str.find("<") != string::npos && str.find(">") != string::npos)
{
amounttag++;
}
if ( c == '!')
{
amountcomment++;
}
cout << " This file contains :" << amountline << " lines" << endl;
cout << " This file contains :" << amountcha << " charecters" << endl;
cout << " this file has : " << amountcomment<< " comments " << endl;
cout << " This file contains : " << amounttag << "tags" << endl;
cout << " Copy complete, edited code located in " << file2 << endl;
return 0;
}thats all my code so far.
why not just use getline() to read an entire line at one time?
std::string line;
while( getline(ipfile, line) )
{
// blabla
}I don't do html coding, but I think any given tag must be on one line, such as "<html>" can not be split between lines, so it doesn't make any sense to read the html file one character at a time.
I can use getline to search for html tags in the line?
you use getline() to read an entire line that is terminated with '\n'. Then use string::find() to look for < and > characters as shown in previous example code.
Also note that ipfile.eof() is not needed in my loop because the loop stops on error or end-of-file.
You could tokenize (strtok) by "<" and stick each piece into a vector or so... then get it's size().
You could tokenize (strtok) by "<" and stick each piece into a vector or so... then get it's size().
That sounds like the hard way. strtok() embeds NULLs in the string, which might corrupt the std::string class.
>You could tokenize (strtok) by "<" and stick each piece into a vector or so... then get it's size().
Best not to mix c with c++. Naughty naughty :-0
In any case all these suggestions are too niave. There are a few examples which will slip through the loop, (html attributes)
http://haacked.com/archive/2004/10/25/usingregularexpressionstomatchhtml.aspx
So using regular expressions, would be the best way to deal with this however, if this is homework your professor is unlikely to care.
I got it working guys :) Code I used below :
if (c=='<' )
{
istag = true;
}
if (c== '>' && istag == true)
{
amounttag++;
istag = false;
}
if (c== '!')
{
iscomment = true;
}
if ( c== '-' && iscomment == true)
{
amountcomment++;
amounttag --;
iscomment = false;
}works a treat :) , Thanks for all your help.
I think I am doing the same assignment as you. Dont forget there maybe an exclamation mark in normal text. "Hello!" you would be better saying if '<' precedes '!' then add 1 to comment count.
We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.