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/*
* Copyright (c) 2020-2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGUI/TextEditor.h>
#include <LibGfx/Color.h>
#include <LibSyntax/Highlighter.h>
namespace Syntax {
Highlighter::~Highlighter()
{
}
void Highlighter::highlight_matching_token_pair()
{
auto& document = m_client->get_document();
enum class Direction {
Forward,
Backward,
};
auto find_span_of_type = [&](auto i, void* type, void* not_type, Direction direction) -> Optional<size_t> {
size_t nesting_level = 0;
bool forward = direction == Direction::Forward;
if (forward) {
++i;
if (i >= document.spans().size())
return {};
} else {
if (i == 0)
return {};
--i;
}
for (;;) {
auto& span = document.spans().at(i);
auto span_token_type = span.data;
if (token_types_equal(span_token_type, not_type)) {
++nesting_level;
} else if (token_types_equal(span_token_type, type)) {
if (nesting_level-- <= 0)
return i;
}
if (forward) {
++i;
if (i >= document.spans().size())
return {};
} else {
if (i == 0)
return {};
--i;
}
}
return {};
};
auto make_buddies = [&](int index0, int index1) {
auto& buddy0 = document.spans()[index0];
auto& buddy1 = document.spans()[index1];
m_has_brace_buddies = true;
m_brace_buddies[0].index = index0;
m_brace_buddies[1].index = index1;
m_brace_buddies[0].span_backup = buddy0;
m_brace_buddies[1].span_backup = buddy1;
buddy0.attributes.background_color = Color::DarkCyan;
buddy1.attributes.background_color = Color::DarkCyan;
buddy0.attributes.color = Color::White;
buddy1.attributes.color = Color::White;
m_client->do_update();
};
auto pairs = matching_token_pairs();
for (size_t i = 0; i < document.spans().size(); ++i) {
auto& span = const_cast<GUI::TextDocumentSpan&>(document.spans().at(i));
auto token_type = span.data;
for (auto& pair : pairs) {
if (token_types_equal(token_type, pair.open) && span.range.start() == m_client->get_cursor()) {
auto buddy = find_span_of_type(i, pair.close, pair.open, Direction::Forward);
if (buddy.has_value())
make_buddies(i, buddy.value());
return;
}
}
auto right_of_end = span.range.end();
right_of_end.set_column(right_of_end.column() + 1);
for (auto& pair : pairs) {
if (token_types_equal(token_type, pair.close) && right_of_end == m_client->get_cursor()) {
auto buddy = find_span_of_type(i, pair.open, pair.close, Direction::Backward);
if (buddy.has_value())
make_buddies(i, buddy.value());
return;
}
}
}
}
void Highlighter::attach(HighlighterClient& client)
{
VERIFY(!m_client);
m_client = &client;
}
void Highlighter::detach()
{
m_client = nullptr;
}
void Highlighter::cursor_did_change()
{
auto& document = m_client->get_document();
if (m_has_brace_buddies) {
if (m_brace_buddies[0].index >= 0 && m_brace_buddies[0].index < static_cast<int>(document.spans().size()))
document.set_span_at_index(m_brace_buddies[0].index, m_brace_buddies[0].span_backup);
if (m_brace_buddies[1].index >= 0 && m_brace_buddies[1].index < static_cast<int>(document.spans().size()))
document.set_span_at_index(m_brace_buddies[1].index, m_brace_buddies[1].span_backup);
m_has_brace_buddies = false;
m_client->do_update();
}
highlight_matching_token_pair();
}
}
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