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/*
* Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenityos.org>
* Copyright (c) 2021, Max Wipfli <mail@maxwipfli.ch>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Debug.h>
#include <LibJS/SyntaxHighlighter.h>
#include <LibWeb/CSS/SyntaxHighlighter/SyntaxHighlighter.h>
#include <LibWeb/HTML/Parser/HTMLTokenizer.h>
#include <LibWeb/HTML/SyntaxHighlighter/SyntaxHighlighter.h>
namespace Web::HTML {
enum class AugmentedTokenKind : u32 {
AttributeName,
AttributeValue,
OpenTag,
CloseTag,
Comment,
Doctype,
__Count,
};
bool SyntaxHighlighter::is_identifier(u64 token) const
{
if (!token)
return false;
return false;
}
bool SyntaxHighlighter::is_navigatable(u64) const
{
return false;
}
void SyntaxHighlighter::rehighlight(Palette const& palette)
{
dbgln_if(SYNTAX_HIGHLIGHTING_DEBUG, "(HTML::SyntaxHighlighter) starting rehighlight");
auto text = m_client->get_text();
clear_nested_token_pairs();
// FIXME: Add folding regions for start and end tags.
Vector<GUI::TextDocumentFoldingRegion> folding_regions;
Vector<GUI::TextDocumentSpan> spans;
auto highlight = [&](auto start_line, auto start_column, auto end_line, auto end_column, Gfx::TextAttributes attributes, AugmentedTokenKind kind) {
if (start_line > end_line || (start_line == end_line && start_column >= end_column)) {
dbgln_if(SYNTAX_HIGHLIGHTING_DEBUG, "(HTML::SyntaxHighlighter) discarding ({}-{}) to ({}-{}) because it has zero or negative length", start_line, start_column, end_line, end_column);
return;
}
dbgln_if(SYNTAX_HIGHLIGHTING_DEBUG, "(HTML::SyntaxHighlighter) highlighting ({}-{}) to ({}-{}) with color {}", start_line, start_column, end_line, end_column, attributes.color);
spans.empend(
GUI::TextRange {
{ start_line, start_column },
{ end_line, end_column },
},
move(attributes),
static_cast<u64>(kind),
false);
};
HTMLTokenizer tokenizer { text, "utf-8" };
[[maybe_unused]] enum class State {
HTML,
Javascript,
CSS,
} state { State::HTML };
StringBuilder substring_builder;
GUI::TextPosition substring_start_position;
for (;;) {
auto token = tokenizer.next_token();
if (!token.has_value() || token.value().is_end_of_file())
break;
dbgln_if(SYNTAX_HIGHLIGHTING_DEBUG, "(HTML::SyntaxHighlighter) got token of type {}", token->to_deprecated_string());
if (token->is_start_tag()) {
if (token->tag_name() == "script"sv) {
tokenizer.switch_to(HTMLTokenizer::State::ScriptData);
state = State::Javascript;
substring_start_position = { token->end_position().line, token->end_position().column };
} else if (token->tag_name() == "style"sv) {
tokenizer.switch_to(HTMLTokenizer::State::RAWTEXT);
state = State::CSS;
substring_start_position = { token->end_position().line, token->end_position().column };
}
} else if (token->is_end_tag()) {
if (token->tag_name().is_one_of("script"sv, "style"sv)) {
if (state == State::Javascript) {
Syntax::ProxyHighlighterClient proxy_client {
*m_client,
substring_start_position,
static_cast<u64>(AugmentedTokenKind::__Count) + first_free_token_kind_serial_value(),
substring_builder.string_view()
};
{
JS::SyntaxHighlighter highlighter;
highlighter.attach(proxy_client);
highlighter.rehighlight(palette);
highlighter.detach();
register_nested_token_pairs(proxy_client.corrected_token_pairs(highlighter.matching_token_pairs()));
}
spans.extend(proxy_client.corrected_spans());
folding_regions.extend(proxy_client.corrected_folding_regions());
substring_builder.clear();
} else if (state == State::CSS) {
Syntax::ProxyHighlighterClient proxy_client {
*m_client,
substring_start_position,
static_cast<u64>(AugmentedTokenKind::__Count) + first_free_token_kind_serial_value(),
substring_builder.string_view()
};
{
CSS::SyntaxHighlighter highlighter;
highlighter.attach(proxy_client);
highlighter.rehighlight(palette);
highlighter.detach();
register_nested_token_pairs(proxy_client.corrected_token_pairs(highlighter.matching_token_pairs()));
}
spans.extend(proxy_client.corrected_spans());
folding_regions.extend(proxy_client.corrected_folding_regions());
substring_builder.clear();
}
state = State::HTML;
}
} else if (state != State::HTML) {
VERIFY(token->is_character());
substring_builder.append_code_point(token->code_point());
continue;
}
size_t token_start_offset = token->is_end_tag() ? 1 : 0;
if (token->is_comment()) {
highlight(
token->start_position().line,
token->start_position().column,
token->end_position().line,
token->end_position().column,
{ palette.syntax_comment(), {} },
AugmentedTokenKind::Comment);
GUI::TextDocumentFoldingRegion region;
region.range.set_start({ token->start_position().line, token->start_position().column + comment_prefix()->length() });
region.range.set_end({ token->end_position().line, token->end_position().column - comment_suffix()->length() });
folding_regions.append(move(region));
} else if (token->is_start_tag() || token->is_end_tag()) {
highlight(
token->start_position().line,
token->start_position().column + token_start_offset,
token->start_position().line,
token->start_position().column + token_start_offset + token->tag_name().length(),
{ palette.syntax_keyword(), {}, true },
token->is_start_tag() ? AugmentedTokenKind::OpenTag : AugmentedTokenKind::CloseTag);
token->for_each_attribute([&](auto& attribute) {
highlight(
attribute.name_start_position.line,
attribute.name_start_position.column + token_start_offset,
attribute.name_end_position.line,
attribute.name_end_position.column + token_start_offset,
{ palette.syntax_identifier(), {} },
AugmentedTokenKind::AttributeName);
highlight(
attribute.value_start_position.line,
attribute.value_start_position.column + token_start_offset,
attribute.value_end_position.line,
attribute.value_end_position.column + token_start_offset,
{ palette.syntax_string(), {} },
AugmentedTokenKind::AttributeValue);
return IterationDecision::Continue;
});
} else if (token->is_doctype()) {
highlight(
token->start_position().line,
token->start_position().column,
token->start_position().line,
token->start_position().column,
{ palette.syntax_preprocessor_statement(), {} },
AugmentedTokenKind::Doctype);
}
}
if constexpr (SYNTAX_HIGHLIGHTING_DEBUG) {
dbgln("(HTML::SyntaxHighlighter) list of all spans:");
for (auto& span : spans)
dbgln("{}, {} - {}", span.range, span.attributes.color, span.data);
dbgln("(HTML::SyntaxHighlighter) end of list");
}
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<MatchingTokenPair> pairs;
if (pairs.is_empty()) {
pairs.append({ static_cast<u64>(AugmentedTokenKind::OpenTag), static_cast<u64>(AugmentedTokenKind::CloseTag) });
}
return pairs;
}
bool SyntaxHighlighter::token_types_equal(u64 token0, u64 token1) const
{
return token0 == token1;
}
}
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