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#include <LibGUI/CppLexer.h>
#include <LibGUI/CppSyntaxHighlighter.h>
#include <LibGUI/TextEditor.h>
#include <LibGfx/Font.h>
namespace GUI {
struct TextStyle {
Color color;
const Gfx::Font* font { nullptr };
};
static TextStyle style_for_token_type(CppToken::Type type)
{
switch (type) {
case CppToken::Type::Keyword:
return { Color::Black, &Gfx::Font::default_bold_fixed_width_font() };
case CppToken::Type::KnownType:
return { Color::from_rgb(0x800080), &Gfx::Font::default_bold_fixed_width_font() };
case CppToken::Type::Identifier:
return { Color::from_rgb(0x092e64) };
case CppToken::Type::DoubleQuotedString:
case CppToken::Type::SingleQuotedString:
case CppToken::Type::Number:
return { Color::from_rgb(0x800000) };
case CppToken::Type::PreprocessorStatement:
return { Color::from_rgb(0x008080) };
case CppToken::Type::Comment:
return { Color::from_rgb(0x008000) };
default:
return { Color::Black };
}
}
void CppSyntaxHighlighter::rehighlight()
{
ASSERT(m_editor);
auto text = m_editor->text();
CppLexer lexer(text);
auto tokens = lexer.lex();
Vector<GUI::TextDocumentSpan> spans;
for (auto& token : tokens) {
#ifdef DEBUG_SYNTAX_HIGHLIGHTING
dbg() << token.to_string() << " @ " << token.m_start.line << ":" << token.m_start.column << " - " << token.m_end.line << ":" << token.m_end.column;
#endif
GUI::TextDocumentSpan span;
span.range.set_start({ token.m_start.line, token.m_start.column });
span.range.set_end({ token.m_end.line, token.m_end.column });
auto style = style_for_token_type(token.m_type);
span.color = style.color;
span.font = style.font;
span.is_skippable = token.m_type == CppToken::Type::Whitespace;
span.data = (void*)token.m_type;
spans.append(span);
}
m_editor->document().set_spans(spans);
m_has_brace_buddies = false;
highlight_matching_token_pair();
m_editor->update();
}
void CppSyntaxHighlighter::highlight_matching_token_pair()
{
ASSERT(m_editor);
auto& document = m_editor->document();
enum class Direction {
Forward,
Backward,
};
auto find_span_of_type = [&](int i, CppToken::Type type, CppToken::Type not_type, Direction direction) {
int nesting_level = 0;
bool forward = direction == Direction::Forward;
for (forward ? ++i : --i; forward ? (i < document.spans().size()) : (i >= 0); forward ? ++i : --i) {
auto& span = document.spans().at(i);
auto span_token_type = (CppToken::Type)((uintptr_t)span.data);
if (span_token_type == not_type) {
++nesting_level;
} else if (span_token_type == type) {
if (nesting_level-- <= 0)
return i;
}
}
return -1;
};
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 (int i = 0; i < document.spans().size(); ++i) {
auto& span = const_cast<GUI::TextDocumentSpan&>(document.spans().at(i));
auto token_type = (CppToken::Type)((uintptr_t)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 != -1)
make_buddies(i, buddy);
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 != -1)
make_buddies(i, buddy);
return;
}
}
}
}
CppSyntaxHighlighter::~CppSyntaxHighlighter()
{
}
}
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