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/*
* Copyright (c) 2020, the SerenityOS developers.
* Copyright (c) 2023, Sam Atkins <atkinssj@serenityos.org>
*
* 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 Gfx::TextAttributes style_for_token_type(Gfx::Palette const& palette, TokenType type)
{
switch (Token::category(type)) {
case TokenCategory::Invalid:
return { palette.syntax_comment() };
case TokenCategory::Number:
return { palette.syntax_number() };
case TokenCategory::String:
return { palette.syntax_string() };
case TokenCategory::Punctuation:
return { palette.syntax_punctuation() };
case TokenCategory::Operator:
return { palette.syntax_operator() };
case TokenCategory::Keyword:
return { palette.syntax_keyword(), {}, true };
case TokenCategory::ControlKeyword:
return { palette.syntax_control_keyword(), {}, true };
case TokenCategory::Identifier:
return { palette.syntax_identifier() };
default:
return { palette.base_text() };
}
}
bool SyntaxHighlighter::is_identifier(u64 token) const
{
auto js_token = static_cast<TokenType>(static_cast<size_t>(token));
return js_token == TokenType::Identifier;
}
bool SyntaxHighlighter::is_navigatable([[maybe_unused]] u64 token) const
{
return false;
}
void SyntaxHighlighter::rehighlight(Palette const& palette)
{
auto text = m_client->get_text();
Lexer lexer(text);
Vector<GUI::TextDocumentSpan> spans;
Vector<GUI::TextDocumentFoldingRegion> folding_regions;
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, Token const& 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 ? TokenType::Invalid : token.type();
span.attributes = style_for_token_type(palette, type);
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());
};
struct TokenData {
Token token;
GUI::TextRange range;
};
Vector<TokenData> folding_region_start_tokens;
bool was_eof = false;
for (auto token = lexer.next(); !was_eof; token = lexer.next()) {
append_token(token.trivia(), token, true);
auto token_start_position = position;
append_token(token.value(), token, false);
if (token.type() == TokenType::Eof)
was_eof = true;
// Create folding regions for {} blocks
if (token.type() == TokenType::CurlyOpen) {
folding_region_start_tokens.append({ .token = token,
.range = { token_start_position, position } });
} else if (token.type() == TokenType::CurlyClose) {
if (!folding_region_start_tokens.is_empty()) {
auto curly_open = folding_region_start_tokens.take_last();
GUI::TextDocumentFoldingRegion region;
region.range.set_start(curly_open.range.end());
region.range.set_end(token_start_position);
folding_regions.append(region);
}
}
}
m_client->do_set_spans(move(spans));
m_client->do_set_folding_regions(move(folding_regions));
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>(TokenType::CurlyOpen), static_cast<u64>(TokenType::CurlyClose) });
pairs.append({ static_cast<u64>(TokenType::ParenOpen), static_cast<u64>(TokenType::ParenClose) });
pairs.append({ static_cast<u64>(TokenType::BracketOpen), static_cast<u64>(TokenType::BracketClose) });
}
return pairs;
}
bool SyntaxHighlighter::token_types_equal(u64 token1, u64 token2) const
{
return static_cast<TokenType>(token1) == static_cast<TokenType>(token2);
}
}
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