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/*
* Copyright (c) 2022, Itamar S. <itamar8910@gmail.com>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "SemanticSyntaxHighlighter.h"
#include "Lexer.h"
#include <LibDiff/Generator.h>
#include <LibGUI/AutocompleteProvider.h>
#include <LibGfx/Palette.h>
namespace Cpp {
void SemanticSyntaxHighlighter::rehighlight(Palette const& palette)
{
Vector<CodeComprehension::TokenInfo> new_tokens_info;
auto text = m_client->get_text();
{
Threading::MutexLocker locker(m_lock);
Cpp::Lexer lexer(text);
lexer.set_ignore_whitespace(true);
auto current_tokens = lexer.lex();
StringBuilder current_tokens_as_lines;
StringBuilder previous_tokens_as_lines;
for (auto& token : current_tokens)
current_tokens_as_lines.appendff("{}\n", token.type_as_deprecated_string());
for (Cpp::Token const& token : m_saved_tokens)
previous_tokens_as_lines.appendff("{}\n", token.type_as_deprecated_string());
auto previous = previous_tokens_as_lines.build();
auto current = current_tokens_as_lines.build();
// FIXME: Computing the diff on the entire document's tokens is quite inefficient.
// An improvement over this could be only including the tokens that are in edited text ranges in the diff.
auto diff_hunks = Diff::from_text(previous.view(), current.view());
for (auto& token : current_tokens) {
new_tokens_info.append(CodeComprehension::TokenInfo { CodeComprehension::TokenInfo::SemanticType::Unknown,
token.start().line, token.start().column, token.end().line, token.end().column });
}
size_t previous_token_index = 0;
size_t current_token_index = 0;
for (auto const& hunk : diff_hunks) {
for (; previous_token_index < hunk.original_start_line; ++previous_token_index) {
new_tokens_info[current_token_index].type = m_tokens_info[previous_token_index].type;
++current_token_index;
}
for (size_t i = 0; i < hunk.added_lines.size(); ++i) {
++current_token_index;
}
for (size_t i = 0; i < hunk.removed_lines.size(); ++i) {
++previous_token_index;
}
}
while (current_token_index < new_tokens_info.size() && previous_token_index < m_tokens_info.size()) {
new_tokens_info[current_token_index].type = m_tokens_info[previous_token_index].type;
++previous_token_index;
++current_token_index;
}
}
update_spans(new_tokens_info, palette);
}
static Syntax::TextStyle style_for_token_type(Gfx::Palette const& palette, CodeComprehension::TokenInfo::SemanticType type)
{
switch (type) {
case CodeComprehension::TokenInfo::SemanticType::Unknown:
return { palette.base_text(), false };
case CodeComprehension::TokenInfo::SemanticType::Keyword:
return { palette.syntax_keyword(), true };
case CodeComprehension::TokenInfo::SemanticType::Type:
return { palette.syntax_type(), true };
case CodeComprehension::TokenInfo::SemanticType::Identifier:
return { palette.syntax_identifier(), false };
case CodeComprehension::TokenInfo::SemanticType::String:
return { palette.syntax_string(), false };
case CodeComprehension::TokenInfo::SemanticType::Number:
return { palette.syntax_number(), false };
case CodeComprehension::TokenInfo::SemanticType::IncludePath:
return { palette.syntax_preprocessor_value(), false };
case CodeComprehension::TokenInfo::SemanticType::PreprocessorStatement:
return { palette.syntax_preprocessor_statement(), false };
case CodeComprehension::TokenInfo::SemanticType::Comment:
return { palette.syntax_comment(), false };
case CodeComprehension::TokenInfo::SemanticType::Function:
return { palette.syntax_function(), false };
case CodeComprehension::TokenInfo::SemanticType::Variable:
return { palette.syntax_variable(), false };
case CodeComprehension::TokenInfo::SemanticType::CustomType:
return { palette.syntax_custom_type(), false };
case CodeComprehension::TokenInfo::SemanticType::Namespace:
return { palette.syntax_namespace(), false };
case CodeComprehension::TokenInfo::SemanticType::Member:
return { palette.syntax_member(), false };
case CodeComprehension::TokenInfo::SemanticType::Parameter:
return { palette.syntax_parameter(), false };
case CodeComprehension::TokenInfo::SemanticType::PreprocessorMacro:
return { palette.syntax_preprocessor_value(), false };
default:
VERIFY_NOT_REACHED();
return { palette.base_text(), false };
}
}
void SemanticSyntaxHighlighter::update_spans(Vector<CodeComprehension::TokenInfo> const& tokens_info, Gfx::Palette const& palette)
{
Vector<GUI::TextDocumentSpan> spans;
for (auto& token : tokens_info) {
// FIXME: The +1 for the token end column is a quick hack due to not wanting to modify the lexer (which is also used by the parser). Maybe there's a better way to do this.
GUI::TextDocumentSpan span;
span.range.set_start({ token.start_line, token.start_column });
span.range.set_end({ token.end_line, token.end_column + 1 });
auto style = style_for_token_type(palette, token.type);
span.attributes.color = style.color;
span.attributes.bold = style.bold;
span.is_skippable = token.type == CodeComprehension::TokenInfo::SemanticType::Whitespace;
span.data = static_cast<u64>(token.type);
spans.append(span);
}
m_client->do_set_spans(move(spans));
m_has_brace_buddies = false;
highlight_matching_token_pair();
m_client->do_update();
}
void SemanticSyntaxHighlighter::update_tokens_info(Vector<CodeComprehension::TokenInfo> tokens_info)
{
{
Threading::MutexLocker locker(m_lock);
m_tokens_info = move(tokens_info);
m_saved_tokens_text = m_client->get_text();
Cpp::Lexer lexer(m_saved_tokens_text);
lexer.set_ignore_whitespace(true);
m_saved_tokens = lexer.lex();
}
}
bool SemanticSyntaxHighlighter::is_identifier(u64 token_type) const
{
auto type = static_cast<CodeComprehension::TokenInfo::SemanticType>(token_type);
return type == CodeComprehension::TokenInfo::SemanticType::Identifier
|| type == CodeComprehension::TokenInfo::SemanticType::Function
|| type == CodeComprehension::TokenInfo::SemanticType::Variable
|| type == CodeComprehension::TokenInfo::SemanticType::CustomType
|| type == CodeComprehension::TokenInfo::SemanticType::Namespace
|| type == CodeComprehension::TokenInfo::SemanticType::Member
|| type == CodeComprehension::TokenInfo::SemanticType::Parameter
|| type == CodeComprehension::TokenInfo::SemanticType::PreprocessorMacro;
}
bool SemanticSyntaxHighlighter::is_navigatable(u64 token_type) const
{
return static_cast<CodeComprehension::TokenInfo::SemanticType>(token_type) == CodeComprehension::TokenInfo::SemanticType::IncludePath;
}
}
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