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// -*- mode: c++; c-basic-offset: 2; -*-
#include "common.hh"
#include <algorithm>
#include <deque>
#include <string.h>
#include <vector>
#include "gui_htmlattrtext.hh"
namespace {
char const* ESCAPE = "&<>\"\n ";
void append_escaped(std::string* out, char const* in, size_t len) {
size_t last = 0;
for (size_t i = 0; i < len; ++i) {
auto tmp = reinterpret_cast<char const*>(memchr(ESCAPE, in[i], 6));
if (!tmp) continue;
if (last < i) {
out->append(in + last, i - last);
}
last = i + 1;
switch (tmp - ESCAPE) {
case 0:
out->append("&");
break;
case 1:
out->append("<");
break;
case 2:
out->append(">");
break;
case 3:
out->append(""");
break;
case 4:
out->append("<br>");
break;
case 5:
out->append(" ");
break;
}
}
if (last < len) {
out->append(in + last, len - last);
}
}
void color(std::string* out, uint32_t color) {
char tmp[30];
if (color >> 24 == 0xff) {
out->append(tmp, snprintf(tmp, sizeof(tmp), "rgb(%u, %u, %u)",
static_cast<unsigned>((color >> 16) & 0xff),
static_cast<unsigned>((color >> 8) & 0xff),
static_cast<unsigned>(color & 0xff)));
} else {
out->append(tmp, snprintf(tmp, sizeof(tmp), "rgba(%u, %u, %u, %u)",
static_cast<unsigned>((color >> 16) & 0xff),
static_cast<unsigned>((color >> 8) & 0xff),
static_cast<unsigned>(color & 0xff),
static_cast<unsigned>(color >> 24)));
}
}
class HtmlAttributedTextImpl : public HtmlAttributedText {
public:
void append(const char* str, size_t len, Attribute const& attr, size_t start, size_t length) override {
if (!str || start >= len) return;
length = std::min(len - start, length);
if (length == 0) return;
auto offset = text_.size();
text_.append(str + start, length);
if (attr != EMPTY) ranges_.emplace_back(attr, offset, offset + length);
}
void add(Attribute const& attr, size_t start, size_t length) override {
if (attr == EMPTY) return;
auto end = check_end(start, length);
if (end == 0) return;
Range r(attr, start, end);
auto it = std::lower_bound(ranges_.begin(), ranges_.end(), r);
if (it != ranges_.end() && it->start_ == r.start_ && it->end_ == r.end_) {
it->attr_.add(r.attr_);
return;
}
ranges_.insert(it, r);
}
void set(Attribute const& attr, size_t start, size_t length) override {
clear(start, length);
add(attr, start, length);
}
void clear(size_t start, size_t length) override {
auto end = check_end(start, length);
if (end == 0) return;
auto it = ranges_.begin();
while (it != ranges_.end()) {
if (it->start_ >= end) break;
if (it->end_ <= start) {
++it;
continue;
}
if (it->start_ == start && it->end_ == end) {
it = ranges_.erase(it);
continue;
}
if (start > it->start_ && end < it->end_) {
auto const e = it->end_;
it->end_ = start;
it = ranges_.emplace(it + 1, it->attr_, end, e);
} else if (start <= it->start_) {
it->start_ = end;
} else {
assert(end >= it->end_);
it->end_ = start;
}
++it;
}
}
std::string html() const override {
std::string ret;
std::deque<Range const*> stack;
size_t last = 0;
for (auto const& range : ranges_) {
while (!stack.empty() && stack.front()->end_ <= range.start_) {
if (stack.front()->end_ > last) {
append_escaped(&ret, text_.data() + last, stack.front()->end_ - last);
last = stack.front()->end_;
}
end_tag(&ret, stack.front()->attr_);
stack.pop_front();
}
if (range.start_ > last) {
append_escaped(&ret, text_.data() + last, range.start_ - last);
last = range.start_;
}
start_tag(&ret, range.attr_);
auto it = std::lower_bound(stack.begin(), stack.end(), &range, [](Range const* r1, Range const* r2) -> bool {
return r1->end_ < r2->end_;
});
stack.emplace(it, &range);
}
while (!stack.empty()) {
if (stack.front()->end_ > last) {
append_escaped(&ret, text_.data() + last, stack.front()->end_ - last);
last = stack.front()->end_;
}
end_tag(&ret, stack.front()->attr_);
stack.pop_front();
}
if (last < text_.size()) {
append_escaped(&ret, text_.data() + last, text_.size() - last);
}
return ret;
}
std::string text() const override {
return text_;
}
private:
struct Range {
size_t start_;
size_t end_;
Attribute attr_;
Range(Attribute const& attr, size_t start, size_t end)
: start_(start), end_(end), attr_(attr) {
assert(start_ < end_);
}
bool operator<(Range const& range) const {
return start_ < range.start_;
}
};
size_t check_end(size_t start, size_t length) const {
if (start >= text_.size()) return 0;
length = std::min(text_.size() - start, length);
if (length == 0) return 0;
return start + length;
}
static void start_tag(std::string* out, Attribute const& attr) {
out->append("<span style=\"");
if (attr.bold()) out->append("font-weight: bold; ");
if (attr.italic()) out->append("font-style: italic; ");
if (attr.underline()) out->append("text-decoration: underline; ");
if (attr.strike()) out->append("text-decoration: line-through; ");
if (attr.has_foreground()) {
out->append("color: ");
color(out, attr.foreground());
out->append("; ");
}
if (attr.has_background()) {
out->append("background-color: ");
color(out, attr.background());
out->append("; ");
}
out->append("\">");
}
static void end_tag(std::string* out, Attribute const& UNUSED(attr)) {
out->append("</span>");
}
std::string text_;
std::vector<Range> ranges_;
};
} // namespace
// static
HtmlAttributedText* HtmlAttributedText::create() {
return new HtmlAttributedTextImpl();
}
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