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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "semantichighlighter.h"
#include "syntaxhighlighter.h"
#include "texteditorsettings.h"
#include <utils/qtcassert.h>
#include <QTextBlock>
#include <QTextDocument>
#include <algorithm>
using namespace TextEditor;
using namespace TextEditor::SemanticHighlighter;
namespace {
class Range {
public:
QTextLayout::FormatRange formatRange;
QTextBlock block;
};
using Ranges = QVector<Range>;
const Ranges rangesForResult(const HighlightingResult &result, const QTextBlock &startBlock,
const QHash<int, QTextCharFormat> &kindToFormat)
{
const QTextCharFormat format = result.useTextSyles
? TextEditorSettings::fontSettings().toTextCharFormat(result.textStyles)
: kindToFormat.value(result.kind);
if (!format.isValid())
return {};
HighlightingResult curResult = result;
QTextBlock curBlock = startBlock;
Ranges ranges;
while (curBlock.isValid()) {
Range range;
range.block = curBlock;
range.formatRange.format = format;
range.formatRange.start = curResult.column - 1;
range.formatRange.length = std::min(curResult.length,
curBlock.length() - range.formatRange.start);
ranges << range;
if (range.formatRange.length == curResult.length)
break;
curBlock = curBlock.next();
curResult.column = 1;
curResult.length -= range.formatRange.length;
}
return ranges;
}
const Ranges rangesForResult(
const HighlightingResult &result,
QTextDocument *doc,
const QHash<int, QTextCharFormat> &kindToFormat,
const Splitter &splitter = {})
{
const QTextBlock startBlock = doc->findBlockByNumber(result.line - 1);
if (splitter) {
Ranges ranges;
for (const auto &[newResult, newBlock] : splitter(result, startBlock))
ranges << rangesForResult(newResult, newBlock, kindToFormat);
return ranges;
}
return rangesForResult(result, startBlock, kindToFormat);
}
}
void SemanticHighlighter::incrementalApplyExtraAdditionalFormats(
SyntaxHighlighter *highlighter,
const QFuture<HighlightingResult> &future,
int from,
int to,
const QHash<int, QTextCharFormat> &kindToFormat,
const Splitter &splitter)
{
if (to <= from)
return;
const int resultStartLine = future.resultAt(from).line;
int formattingStartLine = 1;
// Find the line on which to start formatting, where "formatting" means to either
// clear out formats from outdated document versions (if there is no current result
// on that line), or apply the format corresponding to the respective result.
// Note that if there are earlier results on the same line, we have to make sure they
// get re-applied by adapting the from variable accordingly.
for (int i = from - 1; i >= 0; --i) {
const HighlightingResult &result = future.resultAt(i);
if (result.line == resultStartLine) {
from = i;
} else if (result.line < resultStartLine) {
formattingStartLine = result.line + 1;
from = i + 1;
break;
}
}
QTextDocument *doc = highlighter->document();
QTC_ASSERT(formattingStartLine <= doc->blockCount(), return);
QTextBlock currentBlock = doc->findBlockByNumber(formattingStartLine - 1);
std::map<QTextBlock, QVector<QTextLayout::FormatRange>> formatRanges;
for (int i = from; i < to; ++i) {
for (const Range &range : rangesForResult(future.resultAt(i), doc, kindToFormat, splitter))
formatRanges[range.block].append(range.formatRange);
}
for (auto &[block, ranges] : formatRanges) {
while (currentBlock < block) {
highlighter->clearExtraFormats(currentBlock);
currentBlock = currentBlock.next();
}
highlighter->setExtraFormats(block, std::move(ranges));
currentBlock = block.next();
}
}
void SemanticHighlighter::setExtraAdditionalFormats(SyntaxHighlighter *highlighter,
const QList<HighlightingResult> &results,
const QHash<int, QTextCharFormat> &kindToFormat)
{
if (!highlighter)
return;
highlighter->clearAllExtraFormats();
QTextDocument *doc = highlighter->document();
QTC_ASSERT(doc, return );
std::map<QTextBlock, QVector<QTextLayout::FormatRange>> formatRanges;
for (auto result : results) {
for (const Range &range : rangesForResult(result, doc, kindToFormat))
formatRanges[range.block].append(range.formatRange);
}
for (auto &[block, ranges] : formatRanges)
highlighter->setExtraFormats(block, std::move(ranges));
}
void SemanticHighlighter::clearExtraAdditionalFormatsUntilEnd(
SyntaxHighlighter *highlighter, const QFuture<HighlightingResult> &future)
{
const QTextDocument * const doc = highlighter->document();
QTextBlock firstBlockToClear = doc->begin();
for (int i = future.resultCount() - 1; i >= 0; --i) {
const HighlightingResult &result = future.resultAt(i);
if (result.line) {
const QTextBlock blockForLine = doc->findBlockByNumber(result.line - 1);
const QTextBlock lastBlockWithResults = doc->findBlock(
blockForLine.position() + result.column - 1 + result.length);
firstBlockToClear = lastBlockWithResults.next();
break;
}
}
QList<int> clearBlockNumberVector;
for (QTextBlock b = firstBlockToClear; b.isValid(); b = b.next())
highlighter->clearExtraFormats(b);
}
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