/
web.cpp
executable file
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web.cpp
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#include "lib/web.h"
WebPage::WebPage (string f, map < string, WebPage * >&m)
{
rank = 0;
fstream file;
file.open (f.c_str ());
//if file can't be opened
if (file.fail ())
{
fname = "";
throw invalid_argument ("Text file can't be opened!"); //throw exception if file can't be opened
}
fname = f; //store filename
bool getName = false;
string content, text, link;
while (!file.eof ())
{
if (isspace (file.peek ()))
file.ignore (1); //get rid of whitespace
else if (file.peek () == '[')
{ //if there's a link
file.ignore (1, '[');
getline (file, text, ']'); //get the anchor link until ]
words.push_back (text); //put the anchor text to the word list
getName = true; //start looking for filename
}
else if (getName)
{
if (file.peek () == '(')
file.ignore (1, '(');
else
{
getline (file, link, ')'); //get the link(filename)
bool contains = false;
for (unsigned int i = 0; i < out.size(); i++)
{
if (out[i] == link)
{
contains = true;
break;
}
}
if (!contains)
out.push_back (link); //put the link to the outgoing link list
getName = false; //stop looking for filename
}
}
else
{
file >> content; //get the word if it's not a link
words.push_back (content); //put the word to the list
}
}
m[fname] = this; //map the filename to the webpage pointer
}
WebPage::~WebPage ()
{
//no pointers to delete
}
Set < string > WebPage::allWords () const
{
Set < string > wordlist;
unsigned int
index = 0;
bool
space = false; //consider special characters as space
int
size = words.size ();
string
word;
for (int a = 0; a < size; a++)
{
for (unsigned int i = 0; i < words.at (a).length (); i++)
{
char
c = words.at (a).at (i);
if (c < 48 || (c > 57 && c < 65) || (c > 90 && c < 97) || c > 122) //if there is a special character
{
if (!space)
{
word = words.at (a).substr (index, i - index); // get the substring of the whole string
if (wordlist.find (word) == wordlist.end ()) // if word doesn't exist in the list
wordlist.insert (lower (word)); //convert it to lowercase
space = true; //start looking for another word
}
}
else //if it isn't a special character
{
if (space)
{
space = false;
index = i;
}
else if (i == words.at (a).length () - 1)
{
word = words.at (a).substr (index, i - index + 1);
if (wordlist.find (word) == wordlist.end ()) //if it's not in the set
wordlist.insert (lower (word)); //add it to the set
}
}
}
space = false;
index = 0;
}
return wordlist;
}
ostream & operator<< (ostream & os, const WebPage & page)
{
for (unsigned int i = 0; i < page.words.size (); i++)
os << page.words.at (i); //print the content without brackets and links
//also prints out the anchor text
return os;
}
string
WebPage::lower (string s) const
{
string newstr = "";
for (unsigned int i = 0; i < s.length (); i++)
{
char c = s.at (i);
if (c > 64 && c < 91) //if it's uppercase
newstr += (c + 32); //convert it to lowercase
else
newstr += c; //keep it the same if it's not uppercase
}
return newstr;
}
bool
WebPage::operator== (const WebPage & web)
{
return fname == web.filename (); //check if they have the same filename
}
vector < string > WebPage::allOutgoingLinks () const
{
return out; //return outgoing link set
}
vector < string > WebPage::allIncomingLinks () const
{
return in; //return incoming link set
}
string
WebPage::filename () const
{
return fname; //return filename
}
void
WebPage::parse (map < string, WebPage * >&list)
{
//iterate through outgoing link set
for (vector < string >::iterator it = out.begin (); it != out.end (); ++it)
{
//add incoming link to the webpages on the outgoing list
list.at (*it)->addIncomingLink (list.at (fname));
}
}
void
WebPage::addIncomingLink (WebPage * start)
{
in.push_back (start->filename ()); //insert filename of webpage to the incoming list
}
vector < string > WebPage::getWords ()
{
return words;
}
double
WebPage::getRank () const
{
return rank;
}
void
WebPage::setRank (double r)
{
rank = r;
}
WebPage
WebPage::operator< (const WebPage & w)
{
if (filename () < w.filename ()) //compare webpages by their filenames
return *this;
else
return w;
}