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LibGUI: Abstract token pair matching

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This commit is contained in:
Oriko 2020-03-13 00:51:02 +02:00 • committed by Andreas Kling
parent ac524b632f
commit c02037e944
Notes: sideshowbarker 2024-07-19 08:19:37 +09:00
4 changed files with 124 additions and 105 deletions
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114
Libraries/LibGUI/CppSyntaxHighlighter.cpp
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@ -5,11 +5,6 @@
namespace GUI {
struct TextStyle {
Color color;
const Gfx::Font* font { nullptr };
};
static TextStyle style_for_token_type(CppToken::Type type)
{
switch (type) {
@ -79,105 +74,20 @@ void CppSyntaxHighlighter::rehighlight()
m_editor->update();
}
void CppSyntaxHighlighter::highlight_matching_token_pair()
Vector<SyntaxHighlighter::MatchingTokenPair> CppSyntaxHighlighter::matching_token_pairs() const
{
ASSERT(m_editor);
auto& document = m_editor->document();
enum class Direction {
Forward,
Backward,
};
auto find_span_of_type = [&](auto i, CppToken::Type type, CppToken::Type 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 = (CppToken::Type)((FlatPtr)span.data);
if (span_token_type == not_type) {
++nesting_level;
} else if (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 = const_cast<GUI::TextDocumentSpan&>(document.spans()[index0]);
auto& buddy1 = const_cast<GUI::TextDocumentSpan&>(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.background_color = Color::DarkCyan;
buddy1.background_color = Color::DarkCyan;
buddy0.color = Color::White;
buddy1.color = Color::White;
m_editor->update();
};
struct MatchingTokenPair {
CppToken::Type open;
CppToken::Type close;
};
MatchingTokenPair pairs[] = {
{ CppToken::Type::LeftCurly, CppToken::Type::RightCurly },
{ CppToken::Type::LeftParen, CppToken::Type::RightParen },
{ CppToken::Type::LeftBracket, CppToken::Type::RightBracket },
};
for (size_t i = 0; i < document.spans().size(); ++i) {
auto& span = const_cast<GUI::TextDocumentSpan&>(document.spans().at(i));
auto token_type = (CppToken::Type)((FlatPtr)span.data);
for (auto& pair : pairs) {
if (token_type == pair.open && span.range.start() == m_editor->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_type == pair.close && right_of_end == m_editor->cursor()) {
auto buddy = find_span_of_type(i, pair.open, pair.close, Direction::Backward);
if (buddy.has_value())
make_buddies(i, buddy.value());
return;
}
}
static Vector<SyntaxHighlighter::MatchingTokenPair> pairs;
if (pairs.is_empty()) {
pairs.append({ reinterpret_cast<void*>(CppToken::Type::LeftCurly), reinterpret_cast<void*>(CppToken::Type::RightCurly) });
pairs.append({ reinterpret_cast<void*>(CppToken::Type::LeftParen), reinterpret_cast<void*>(CppToken::Type::RightParen) });
pairs.append({ reinterpret_cast<void*>(CppToken::Type::LeftBracket), reinterpret_cast<void*>(CppToken::Type::RightBracket) });
}
return pairs;
}
bool CppSyntaxHighlighter::token_types_equal(void* token1, void* token2) const
{
return static_cast<GUI::CppToken::Type>(reinterpret_cast<size_t>(token1)) == static_cast<GUI::CppToken::Type>(reinterpret_cast<size_t>(token2));
}
CppSyntaxHighlighter::~CppSyntaxHighlighter()