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#include "stflrichtext.h"
#include <utility>
#include "utils.h"
namespace newsboat {
StflRichText::StflRichText(std::string&& text, std::map<size_t, std::string>&& style_tags)
: text(std::move(text))
, style_tags(std::move(style_tags))
{
}
StflRichText operator+(StflRichText left, const StflRichText& right)
{
auto text = left.text + right.text;
auto tags = left.style_tags;
for (const auto& tag_position : right.style_tags) {
tags[tag_position.first + left.text.size()] = tag_position.second;
}
return StflRichText(std::move(text), std::move(tags));
}
StflRichText StflRichText::from_plaintext(std::string text)
{
text = utils::quote_for_stfl(text);
return from_quoted(text);
}
StflRichText StflRichText::from_quoted(std::string text)
{
auto style_tags = extract_style_tags(text);
return StflRichText(std::move(text), std::move(style_tags));
}
void StflRichText::apply_style_tag(const std::string& tag, size_t start, size_t end)
{
merge_style_tag(style_tags, tag, start, end);
}
std::string StflRichText::plaintext() const
{
return text;
}
std::string StflRichText::stfl_quoted() const
{
return insert_style_tags(text, style_tags);
}
std::map<size_t, std::string> StflRichText::extract_style_tags(std::string& str)
{
std::map<size_t, std::string> tags;
size_t pos = 0;
while (pos < str.size()) {
auto tag_start = str.find_first_of("<>", pos);
if (tag_start == std::string::npos) {
break;
}
if (str[tag_start] == '>') {
// Keep unmatched '>' (stfl way of encoding a literal '>')
pos = tag_start + 1;
continue;
}
auto tag_end = str.find_first_of("<>", tag_start + 1);
if (tag_end == std::string::npos) {
break;
}
if (str[tag_end] == '<') {
// First '<' bracket is unmatched, ignoring it
pos = tag_start + 1;
continue;
}
if (tag_end - tag_start == 1) {
// Convert "<>" into "<" (stfl way of encoding a literal '<')
str.erase(tag_end, 1);
pos = tag_start + 1;
continue;
}
tags[tag_start] = str.substr(tag_start, tag_end - tag_start + 1);
str.erase(tag_start, tag_end - tag_start + 1);
pos = tag_start;
}
return tags;
}
void StflRichText::merge_style_tag(std::map<size_t, std::string>& tags,
const std::string& tag, size_t start, size_t end)
{
if (end <= start) {
return;
}
// Find the latest tag occurring before `end`.
// It is important that looping executes in ascending order of location.
std::string latest_tag = "</>";
for (const auto& location_tag : tags) {
size_t location = location_tag.first;
if (location > end) {
break;
}
latest_tag = location_tag.second;
}
tags[start] = tag;
tags[end] = latest_tag;
// Remove any old tags between the start and end marker
for (auto it = tags.begin(); it != tags.end(); ) {
if (it->first > start && it->first < end) {
it = tags.erase(it);
} else {
++it;
}
}
}
std::string StflRichText::insert_style_tags(const std::string& text,
const std::map<size_t, std::string>& style_tags)
{
auto str = text;
auto tags = style_tags;
// Expand "<" into "<>" (reverse of what happened in extract_style_tags()
size_t pos = 0;
while (pos < str.size()) {
auto bracket = str.find_first_of("<", pos);
if (bracket == std::string::npos) {
break;
}
pos = bracket + 1;
// Add to strings in the `tags` map so we don't have to shift all the positions in that map
// (would be necessary if inserting directly into `str`)
tags[pos] = ">" + tags[pos];
}
for (auto it = tags.rbegin(); it != tags.rend(); ++it) {
if (it->first > str.length()) {
// Ignore tags outside of string
continue;
}
str.insert(it->first, it->second);
}
return str;
}
}
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