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/*
SPDX-FileCopyrightText: 2016 Volker Krause <vkrause@kde.org>
SPDX-License-Identifier: MIT
*/
#include "syntaxhighlighter.h"
#include "abstracthighlighter_p.h"
#include "definition.h"
#include "foldingregion.h"
#include "format.h"
#include "state.h"
#include "theme.h"
Q_DECLARE_METATYPE(QTextBlock)
using namespace KSyntaxHighlighting;
namespace KSyntaxHighlighting
{
class TextBlockUserData : public QTextBlockUserData
{
public:
State state;
QVector<FoldingRegion> foldingRegions;
};
class SyntaxHighlighterPrivate : public AbstractHighlighterPrivate
{
public:
static FoldingRegion foldingRegion(const QTextBlock &startBlock);
QVector<FoldingRegion> foldingRegions;
};
}
FoldingRegion SyntaxHighlighterPrivate::foldingRegion(const QTextBlock &startBlock)
{
const auto data = dynamic_cast<TextBlockUserData *>(startBlock.userData());
if (!data) {
return FoldingRegion();
}
for (int i = data->foldingRegions.size() - 1; i >= 0; --i) {
if (data->foldingRegions.at(i).type() == FoldingRegion::Begin) {
return data->foldingRegions.at(i);
}
}
return FoldingRegion();
}
SyntaxHighlighter::SyntaxHighlighter(QObject *parent)
: QSyntaxHighlighter(parent)
, AbstractHighlighter(new SyntaxHighlighterPrivate)
{
qRegisterMetaType<QTextBlock>();
}
SyntaxHighlighter::SyntaxHighlighter(QTextDocument *document)
: QSyntaxHighlighter(document)
, AbstractHighlighter(new SyntaxHighlighterPrivate)
{
qRegisterMetaType<QTextBlock>();
}
SyntaxHighlighter::~SyntaxHighlighter()
{
}
void SyntaxHighlighter::setDefinition(const Definition &def)
{
const auto needsRehighlight = definition() != def;
AbstractHighlighter::setDefinition(def);
if (needsRehighlight) {
rehighlight();
}
}
bool SyntaxHighlighter::startsFoldingRegion(const QTextBlock &startBlock) const
{
return SyntaxHighlighterPrivate::foldingRegion(startBlock).type() == FoldingRegion::Begin;
}
QTextBlock SyntaxHighlighter::findFoldingRegionEnd(const QTextBlock &startBlock) const
{
const auto region = SyntaxHighlighterPrivate::foldingRegion(startBlock);
auto block = startBlock;
int depth = 1;
while (block.isValid()) {
block = block.next();
const auto data = dynamic_cast<TextBlockUserData *>(block.userData());
if (!data) {
continue;
}
for (auto it = data->foldingRegions.constBegin(); it != data->foldingRegions.constEnd(); ++it) {
if ((*it).id() != region.id()) {
continue;
}
if ((*it).type() == FoldingRegion::End) {
--depth;
} else if ((*it).type() == FoldingRegion::Begin) {
++depth;
}
if (depth == 0) {
return block;
}
}
}
return QTextBlock();
}
void SyntaxHighlighter::highlightBlock(const QString &text)
{
Q_D(SyntaxHighlighter);
State state;
if (currentBlock().position() > 0) {
const auto prevBlock = currentBlock().previous();
const auto prevData = dynamic_cast<TextBlockUserData *>(prevBlock.userData());
if (prevData) {
state = prevData->state;
}
}
d->foldingRegions.clear();
state = highlightLine(text, state);
auto data = dynamic_cast<TextBlockUserData *>(currentBlockUserData());
if (!data) { // first time we highlight this
data = new TextBlockUserData;
data->state = state;
data->foldingRegions = d->foldingRegions;
setCurrentBlockUserData(data);
return;
}
if (data->state == state && data->foldingRegions == d->foldingRegions) { // we ended up in the same state, so we are done here
return;
}
data->state = state;
data->foldingRegions = d->foldingRegions;
const auto nextBlock = currentBlock().next();
if (nextBlock.isValid()) {
QMetaObject::invokeMethod(this, "rehighlightBlock", Qt::QueuedConnection, Q_ARG(QTextBlock, nextBlock));
}
}
void SyntaxHighlighter::applyFormat(int offset, int length, const KSyntaxHighlighting::Format &format)
{
if (length == 0) {
return;
}
QTextCharFormat tf;
// always set the foreground color to avoid palette issues
tf.setForeground(format.textColor(theme()));
if (format.hasBackgroundColor(theme())) {
tf.setBackground(format.backgroundColor(theme()));
}
if (format.isBold(theme())) {
tf.setFontWeight(QFont::Bold);
}
if (format.isItalic(theme())) {
tf.setFontItalic(true);
}
if (format.isUnderline(theme())) {
tf.setFontUnderline(true);
}
if (format.isStrikeThrough(theme())) {
tf.setFontStrikeOut(true);
}
QSyntaxHighlighter::setFormat(offset, length, tf);
}
void SyntaxHighlighter::applyFolding(int offset, int length, FoldingRegion region)
{
Q_UNUSED(offset);
Q_UNUSED(length);
[[maybe_unused]] Q_D(SyntaxHighlighter);
if (region.type() == FoldingRegion::Begin) {
d->foldingRegions.push_back(region);
}
if (region.type() == FoldingRegion::End) {
for (int i = d->foldingRegions.size() - 1; i >= 0; --i) {
if (d->foldingRegions.at(i).id() != region.id() || d->foldingRegions.at(i).type() != FoldingRegion::Begin) {
continue;
}
d->foldingRegions.remove(i);
return;
}
d->foldingRegions.push_back(region);
}
}
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