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//Buffer.cpp
#include "Buffer.h"
using namespace std;
void Buffer::display() const
{
int ix_stop_line_ = ix_top_line_ + window_height_;
for (int i = ix_top_line_; i < ix_stop_line_; ++i)
{
if (i < v_lines_.size())
cout << std::setw(4) << i+1 << " " << v_lines_[i];
cout << '\n';
}
}
//Pass the string by copy because I don't want to change the original, but still need to manipulate it
void Buffer::split_line(string str)
{
// Split up the lines and then push them onto the line vector
while (str.length() > maximum_length_)
{
//Initialize the substring and set the positions in the string where they need to exist
string str_part = str;
size_t curr_pos = str_part.find(" ");
size_t total_pos = curr_pos;
bool searching = true;
//While searching for the next space in a string
while (searching)
{
str_part = str_part.substr(curr_pos + 1, str_part.length());
curr_pos = str_part.find(" ");
if (curr_pos == -1)
{
searching = false;
}
else if (total_pos + curr_pos + 1 > maximum_length_)
{
searching = false;
}
else
{
total_pos += curr_pos + 1;
}
}
//Check if the string part can still be chopped
if (str_part.length() != str.length())
{
str_part = str.substr(0, total_pos);
str = str.substr(total_pos + 1, str.length());
v_lines_.push_back(str_part);
}
//Break out of the loop because there is no way to make the string shorter
//I also didn't see why I can't use break and would have to use a boolean
else
{
break;
}
}
v_lines_.push_back(str);
}
size_t Buffer::get_tag_(const string & line)
{
size_t p_tag = line.find("<p>");
size_t b_tag = line.find("<br>");
if (p_tag > b_tag)
return b_tag;
else
return p_tag;
}
bool Buffer::open(const string & new_file_name, bool add_to_hist_)
{
std::ifstream file(new_file_name);
if (!file)
return false;
v_links_.clear();
v_lines_.clear();
//Note: the vector is cleared only after we know the file
//opened successfully.
int curr_link = 0;
std::string curr_line, line;
while(getline(file, line))
{
//Find tags and process them.
for(auto tag_loc = line.find("<a "); tag_loc != -1; tag_loc = line.find("<a", tag_loc + 1))
{
++curr_link;
//Find the length of the tag and pull out the data from the tag.
auto tag_len = line.find_first_of('>', tag_loc) - tag_loc;
std::string link_tag = line.substr(tag_loc + 3, tag_len - 3);
//Separate the link path and link name into separate strings. Assuming no spaces in the link path.
auto second_space_loc = link_tag.find_first_of(' ', 0);
std::string file_name = link_tag.substr(0, second_space_loc);
std::string link_name = link_tag.substr(second_space_loc + 1);
//Adds the link as a pair to a vector of links.
v_links_.push_back({file_name, link_name});
//Reformat the link tag to match specification.
line.replace(tag_loc, tag_len + 1, "<" + link_name + ">[" + to_string(curr_link) + "]");
}
//Search for all paragraphs and breaks in the line and add them to the v_lines vector.
for(auto _tag = get_tag_(line); _tag != -1; _tag = get_tag_(line))
{
//Check to see if we have a paragraph tag, so we can add a blank line.
bool is_p = _tag == line.find("<p>");
int tag_len = is_p ? 3 : 4;
//Separate out text that should stay in the previous line and text that goes in the new line. Delete the tag in the process.
std::string extra_text = line.substr(_tag + tag_len);
line.erase(_tag);
curr_line += line;
//However, if the tag is located at the start of the file, there will be no data, so it shouldn't be added as it will be an empty line.
if(curr_line != "")
{
split_line(curr_line);
curr_line = "";
if(is_p)
{
v_lines_.push_back("");
}
}
//Move any remaining data on the line back into the line variable so that it can be processed.
line = extra_text;
}
curr_line += line;
}
// Push the contents of curr_line as it has the last line in the file.
split_line(curr_line);
ix_top_line_ = 0;
file_name_ = new_file_name;
if(add_to_hist_)
{
v_hist_.push_back(file_name_);
curr_link_itr = v_hist_.end() - 1;
}
return true;
}
bool Buffer::go(int link)
{
string f_name = v_links_[link-1].first;
if(open(f_name))
return true;
else
return false;
}
bool Buffer::back()
{
if(v_hist_.size() <= 1)
return false;
curr_link_itr = curr_link_itr - 1;
v_hist_.erase(curr_link_itr + 1);
open(*curr_link_itr, false);
return true;
}