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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 <LibWeb/HTML/Parser/HTMLTokenizer.h>
#include <LibWeb/HTML/SyntaxHighlighter/SyntaxHighlighter.h>
namespace Web::HTML {
enum class AugmentedTokenKind : u32 {
AttributeName,
AttributeValue,
OpenTag,
CloseTag,
Comment,
Doctype,
};
bool SyntaxHighlighter::is_identifier(void* token) const
{
if (!token)
return false;
return false;
}
bool SyntaxHighlighter::is_navigatable(void*) const
{
return false;
}
void SyntaxHighlighter::rehighlight(Palette const& palette)
{
dbgln_if(SYNTAX_HIGHLIGHTING_DEBUG, "(HTML::SyntaxHighlighter) starting rehighlight");
(void)palette;
auto text = m_client->get_text();
Vector<GUI::TextDocumentSpan> spans;
auto highlight = [&](auto start_line, auto start_column, auto end_line, auto end_column, Gfx::TextAttributes attributes, AugmentedTokenKind kind) {
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),
(void*)kind,
false);
};
HTMLTokenizer tokenizer { text, "utf-8" };
[[maybe_unused]] enum class State {
HTML,
Javascript,
CSS,
} state { State::HTML };
for (;;) {
auto token = tokenizer.next_token();
if (!token.has_value())
break;
dbgln_if(SYNTAX_HIGHLIGHTING_DEBUG, "(HTML::SyntaxHighlighter) got token of type {}", token->to_string());
if (token->is_start_tag()) {
if (token->tag_name() == "script"sv) {
tokenizer.switch_to(HTMLTokenizer::State::ScriptData);
state = State::Javascript;
} else if (token->tag_name() == "style"sv) {
tokenizer.switch_to(HTMLTokenizer::State::RAWTEXT);
state = State::CSS;
}
} else if (token->is_end_tag()) {
if (token->tag_name().is_one_of("script"sv, "style"sv)) {
if (state == State::Javascript) {
// FIXME: Highlight javascript code here instead.
} else if (state == State::CSS) {
// FIXME: Highlight CSS code here instead.
}
state = State::HTML;
}
}
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->start_position().line,
token->start_position().column,
{ palette.syntax_comment(), {} },
AugmentedTokenKind::Comment);
} else if (token->is_start_tag() || token->is_end_tag()) {
// FIXME: This breaks with single-character tag names.
highlight(
token->start_position().line,
token->start_position().column + token_start_offset,
token->start_position().line,
token->start_position().column + token->tag_name().length() + token_start_offset - 1,
{ palette.syntax_keyword(), {}, false, true },
token->is_start_tag() ? AugmentedTokenKind::OpenTag : AugmentedTokenKind::CloseTag);
for (auto& attribute : token->attributes()) {
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);
}
} 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);
dbgln("(HTML::SyntaxHighlighter) end of list");
}
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() const
{
static Vector<MatchingTokenPair> pairs;
if (pairs.is_empty()) {
pairs.append({ (void*)AugmentedTokenKind::OpenTag, (void*)AugmentedTokenKind::CloseTag });
}
return pairs;
}
bool SyntaxHighlighter::token_types_equal(void* token0, void* token1) const
{
return token0 == token1;
}
}
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