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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(6) << i+1 << " " << v_lines_[i];
cout << '\n';
}
}
string* Buffer::get_lines() const
{
string* lines = new string[window_height_];
int line = 0;
while (line < window_height_ && line + ix_top_line_ < v_lines_.size()) {
lines[line - ix_top_line_] = v_lines_[line];
++line;
}
return lines;
}
auto get_tag(const string & line)
{
auto p_tag = line.find("<p>");
auto 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)
{
std::ifstream file(new_file_name);
if (!file)
return false;
v_lines_.clear();
// Note: the vector is cleared only after we know the file
// opened successfully.
int curr_link = 0;
std::string curr_l, line;
while(getline(file, line))
{
// Remove any newlines that are in the file.
for(auto char_loc = line.find_first_of('\n'); char_loc != -1; char_loc = line.find_first_of('\n'))
line.erase(char_loc, 1);
// Replace break tags with newlines.
for(auto char_loc = line.find("<br>"); char_loc != -1; char_loc = line.find("<br>"))
line.replace(char_loc, 4, "\n");
// Find link tags and process them.
// 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);
// Seperate the link path and link name into seperate 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;
// Seperate 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_l += line;
// However, if the paragraph is empty, then it shouldn't be added.
if(curr_l != "")
{
v_lines_.push_back(curr_l);
curr_l = "";
}
// 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_l != "")
{
v_lines_.push_back(curr_l);
curr_l = "";
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;
}
// Append any data left on this line to the v_line being read. Add a space so that content from two lines can be seperated.
curr_l += " " + line;
}
// Push the contents of curr_p as it has the last line in the file.
v_lines_.push_back(curr_l);
file_name_ = new_file_name;
ix_top_line_ = 0;
v_hist_.push_back(file_name_);
curr_link_itr = v_hist_.end() - 1;
return true;
}
bool Buffer::go(const int & link)
{
string f_name = v_links_[link-1].first;
v_links_.clear();
if(!open(f_name))
return false;
else
{
return true;
}
}
bool Buffer::back()
{
if(v_hist_.empty())
return false;
curr_link_itr = prev(curr_link_itr);
v_hist_.erase(curr_link_itr + 1);
if(v_hist_.size() == 0)
return false;
open(*curr_link_itr);
return true;
}