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/*
* Copyright (c) 2020, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Debug.h>
#include <LibGfx/Palette.h>
#include <LibJS/Lexer.h>
#include <LibJS/SyntaxHighlighter.h>
#include <LibJS/Token.h>
namespace JS {
static Syntax::TextStyle style_for_token_type(const Gfx::Palette& palette, JS::TokenType type)
{
switch (JS::Token::category(type)) {
case JS::TokenCategory::Invalid:
return { palette.syntax_comment() };
case JS::TokenCategory::Number:
return { palette.syntax_number() };
case JS::TokenCategory::String:
return { palette.syntax_string() };
case JS::TokenCategory::Punctuation:
return { palette.syntax_punctuation() };
case JS::TokenCategory::Operator:
return { palette.syntax_operator() };
case JS::TokenCategory::Keyword:
return { palette.syntax_keyword(), true };
case JS::TokenCategory::ControlKeyword:
return { palette.syntax_control_keyword(), true };
case JS::TokenCategory::Identifier:
return { palette.syntax_identifier() };
default:
return { palette.base_text() };
}
}
bool SyntaxHighlighter::is_identifier(u64 token) const
{
auto js_token = static_cast<JS::TokenType>(static_cast<size_t>(token));
return js_token == JS::TokenType::Identifier;
}
bool SyntaxHighlighter::is_navigatable([[maybe_unused]] u64 token) const
{
return false;
}
void SyntaxHighlighter::rehighlight(const Palette& palette)
{
auto text = m_client->get_text();
JS::Lexer lexer(text);
Vector<GUI::TextDocumentSpan> spans;
GUI::TextPosition position { 0, 0 };
GUI::TextPosition start { 0, 0 };
auto advance_position = [&position](char ch) {
if (ch == '\n') {
position.set_line(position.line() + 1);
position.set_column(0);
} else
position.set_column(position.column() + 1);
};
auto append_token = [&](StringView str, const JS::Token& token, bool is_trivia) {
if (str.is_empty())
return;
start = position;
for (size_t i = 0; i < str.length(); ++i)
advance_position(str[i]);
GUI::TextDocumentSpan span;
span.range.set_start(start);
span.range.set_end({ position.line(), position.column() });
auto type = is_trivia ? JS::TokenType::Invalid : token.type();
auto style = style_for_token_type(palette, type);
span.attributes.color = style.color;
span.attributes.bold = style.bold;
span.is_skippable = is_trivia;
span.data = static_cast<u64>(type);
spans.append(span);
dbgln_if(SYNTAX_HIGHLIGHTING_DEBUG, "{}{} @ '{}' {}:{} - {}:{}",
token.name(),
is_trivia ? " (trivia)" : "",
token.value(),
span.range.start().line(), span.range.start().column(),
span.range.end().line(), span.range.end().column());
};
bool was_eof = false;
for (auto token = lexer.next(); !was_eof; token = lexer.next()) {
append_token(token.trivia(), token, true);
append_token(token.value(), token, false);
if (token.type() == JS::TokenType::Eof)
was_eof = true;
}
m_client->do_set_spans(move(spans));
m_has_brace_buddies = false;
highlight_matching_token_pair();
m_client->do_update();
}
Vector<Syntax::Highlighter::MatchingTokenPair> SyntaxHighlighter::matching_token_pairs_impl() const
{
static Vector<Syntax::Highlighter::MatchingTokenPair> pairs;
if (pairs.is_empty()) {
pairs.append({ static_cast<u64>(JS::TokenType::CurlyOpen), static_cast<u64>(JS::TokenType::CurlyClose) });
pairs.append({ static_cast<u64>(JS::TokenType::ParenOpen), static_cast<u64>(JS::TokenType::ParenClose) });
pairs.append({ static_cast<u64>(JS::TokenType::BracketOpen), static_cast<u64>(JS::TokenType::BracketClose) });
}
return pairs;
}
bool SyntaxHighlighter::token_types_equal(u64 token1, u64 token2) const
{
return static_cast<JS::TokenType>(token1) == static_cast<JS::TokenType>(token2);
}
}
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