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LibJS: Assign folding regions for JS files

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Each {} block is now treated as a folding region, so that they can be
collapsed and expanded in TextEditor, HackStudio, and anywhere else
that uses the syntax highlighter. :^)
This commit is contained in:
Sam Atkins 2023-02-23 15:35:57 +00:00 • committed by Andreas Kling
parent cac14a3f0a
commit 0511059d60
1 changed files with 25 additions and 0 deletions
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25
Userland/Libraries/LibJS/SyntaxHighlighter.cpp
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2020, the SerenityOS developers.
* Copyright (c) 2023, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -54,6 +55,7 @@ void SyntaxHighlighter::rehighlight(Palette const& palette)
Lexer lexer(text);
Vector<GUI::TextDocumentSpan> spans;
Vector<GUI::TextDocumentFoldingRegion> folding_regions;
GUI::TextPosition position { 0, 0 };
GUI::TextPosition start { 0, 0 };
@ -92,16 +94,39 @@ void SyntaxHighlighter::rehighlight(Palette const& palette)
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();