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#include <AK/StringBuilder.h>
#include <AK/Utf8View.h>
#include <LibCore/CDirIterator.h>
#include <LibDraw/Font.h>
#include <LibGUI/GPainter.h>
#include <LibHTML/Layout/LayoutBlock.h>
#include <LibHTML/Layout/LayoutText.h>
#include <ctype.h>
LayoutText::LayoutText(const Text& text)
: LayoutNode(&text)
{
set_inline(true);
}
LayoutText::~LayoutText()
{
}
static bool is_all_whitespace(const String& string)
{
for (int i = 0; i < string.length(); ++i) {
if (!isspace(string[i]))
return false;
}
return true;
}
const String& LayoutText::text_for_style(const StyleProperties& style) const
{
static String one_space = " ";
if (is_all_whitespace(node().data())) {
if (style.string_or_fallback(CSS::PropertyID::WhiteSpace, "normal") == "normal")
return one_space;
}
return node().data();
}
void LayoutText::render_fragment(RenderingContext& context, const LineBoxFragment& fragment) const
{
auto& painter = context.painter();
painter.set_font(style().font());
auto color = style().color_or_fallback(CSS::PropertyID::Color, document(), Color::Black);
auto text_decoration = style().string_or_fallback(CSS::PropertyID::TextDecoration, "none");
bool is_underline = text_decoration == "underline";
if (is_underline)
painter.draw_line(fragment.rect().bottom_left().translated(0, -1), fragment.rect().bottom_right().translated(0, -1), color);
painter.draw_text(fragment.rect(), node().data().substring_view(fragment.start(), fragment.length()), TextAlignment::TopLeft, color);
}
template<typename Callback>
void LayoutText::for_each_word(Callback callback) const
{
Utf8View view(node().data());
if (view.is_empty())
return;
auto start_of_word = view.begin();
auto commit_word = [&](auto it) {
int start = view.byte_offset_of(start_of_word);
int length = view.byte_offset_of(it) - view.byte_offset_of(start_of_word);
if (length > 0) {
callback(view.substring_view(start, length), start, length);
}
start_of_word = it;
};
bool last_was_space = isspace(*view.begin());
for (auto it = view.begin(); it != view.end();) {
bool is_space = isspace(*it);
if (is_space == last_was_space) {
++it;
continue;
}
last_was_space = is_space;
commit_word(it);
++it;
}
if (start_of_word != view.end())
commit_word(view.end());
}
template<typename Callback>
void LayoutText::for_each_source_line(Callback callback) const
{
Utf8View view(node().data());
if (view.is_empty())
return;
auto start_of_line = view.begin();
auto commit_line = [&](auto it) {
int start = view.byte_offset_of(start_of_line);
int length = view.byte_offset_of(it) - view.byte_offset_of(start_of_line);
if (length > 0) {
callback(view.substring_view(start, length), start, length);
}
};
for (auto it = view.begin(); it != view.end();) {
bool did_commit = false;
if (*it == '\n') {
commit_line(it);
did_commit = true;
}
++it;
if (did_commit)
start_of_line = it;
}
if (start_of_line != view.end())
commit_line(view.end());
}
void LayoutText::split_into_lines(LayoutBlock& container)
{
auto& font = style().font();
int space_width = font.glyph_width(' ') + font.glyph_spacing();
// FIXME: Allow overriding the line-height. We currently default to 140% which seems to look nice.
int line_height = (int)(font.glyph_height() * 1.4f);
auto& line_boxes = container.line_boxes();
if (line_boxes.is_empty())
line_boxes.append(LineBox());
int available_width = container.rect().width() - line_boxes.last().width();
bool is_preformatted = style().string_or_fallback(CSS::PropertyID::WhiteSpace, "normal") == "pre";
if (is_preformatted) {
for_each_source_line([&](const Utf8View& view, int start, int length) {
line_boxes.last().add_fragment(*this, start, length, font.width(view), line_height);
line_boxes.append(LineBox());
});
return;
}
struct Word {
Utf8View view;
int start;
int length;
};
Vector<Word> words;
for_each_word([&](const Utf8View& view, int start, int length) {
words.append({ Utf8View(view), start, length });
});
for (int i = 0; i < words.size(); ++i) {
auto& word = words[i];
int word_width;
bool is_whitespace = isspace(*word.view.begin());
if (is_whitespace)
word_width = space_width;
else
word_width = font.width(word.view) + font.glyph_spacing();
if (word_width > available_width) {
line_boxes.append(LineBox());
available_width = container.rect().width();
}
if (is_whitespace && line_boxes.last().fragments().is_empty())
continue;
line_boxes.last().add_fragment(*this, word.start, word.length, word_width, line_height);
available_width -= word_width;
if (available_width < 0) {
line_boxes.append(LineBox());
available_width = container.rect().width();
}
}
}
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