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/*
SPDX-FileCopyrightText: 2015-2025 Laurent Montel <montel@kde.org>
SPDX-License-Identifier: LGPL-2.0-or-later
*/
#include "plaintextsyntaxspellcheckinghighlighter.h"
#include "plaintexteditor.h"
#include "textcustomeditor_debug.h"
#include <KSyntaxHighlighting/Definition>
#include <KSyntaxHighlighting/Format>
#include <KSyntaxHighlighting/State>
#include <KSyntaxHighlighting/Theme>
#include <vector>
Q_DECLARE_METATYPE(QTextBlock)
using namespace TextCustomEditor;
namespace TextCustomEditor
{
struct SpellCheckRange {
SpellCheckRange(int o, int l)
: offset(o)
, length(l)
{
}
[[nodiscard]] int end() const
{
return offset + length;
}
int offset;
int length;
};
static QDebug operator<<(QDebug dbg, SpellCheckRange s)
{
dbg << '(' << s.offset << ',' << s.length << ')';
return dbg;
}
class TextBlockUserData : public QTextBlockUserData
{
public:
KSyntaxHighlighting::State state;
};
class PlainTextSyntaxSpellCheckingHighlighterPrivate
{
public:
explicit PlainTextSyntaxSpellCheckingHighlighterPrivate(PlainTextEditor *plainText)
: editor(plainText)
{
}
PlainTextEditor *const editor;
QColor misspelledColor;
bool spellCheckingEnabled = false;
// We can't use QTextBlock user data, Sonnet is occupying that already
// and we can't just daisy-chain them, as QTextBlock deletes the previous
// one when setting a new one. Instead, we need to store this out-of-band.
QHash<int, KSyntaxHighlighting::State> blockState;
std::vector<SpellCheckRange> spellCheckRanges;
};
}
PlainTextSyntaxSpellCheckingHighlighter::PlainTextSyntaxSpellCheckingHighlighter(PlainTextEditor *plainText, const QColor &misspelledColor)
: Sonnet::Highlighter(plainText)
, d(new PlainTextSyntaxSpellCheckingHighlighterPrivate(plainText))
{
qRegisterMetaType<QTextBlock>();
d->misspelledColor = misspelledColor;
setAutomatic(false);
}
PlainTextSyntaxSpellCheckingHighlighter::~PlainTextSyntaxSpellCheckingHighlighter() = default;
void PlainTextSyntaxSpellCheckingHighlighter::toggleSpellHighlighting(bool on)
{
if (on != d->spellCheckingEnabled) {
d->spellCheckingEnabled = on;
rehighlight();
}
}
void PlainTextSyntaxSpellCheckingHighlighter::setDefinition(const KSyntaxHighlighting::Definition &def)
{
const auto needsRehighlight = definition() != def;
AbstractHighlighter::setDefinition(def);
if (needsRehighlight) {
rehighlight();
}
}
void PlainTextSyntaxSpellCheckingHighlighter::highlightBlock(const QString &text)
{
d->spellCheckRanges.clear();
KSyntaxHighlighting::State state;
if (currentBlock().position() > 0) {
const auto prevBlock = currentBlock().previous();
state = d->blockState.value(prevBlock.userState());
}
state = highlightLine(text, state);
if (d->spellCheckingEnabled && d->editor->isEnabled() && !d->spellCheckRanges.empty()) {
Highlighter::highlightBlock(text);
}
if (currentBlockState() <= 0) { // first time we highlight this
setCurrentBlockState(d->blockState.size() + 1);
d->blockState.insert(currentBlockState(), state);
return;
}
if (d->blockState.value(currentBlockState()) == state) {
return;
}
d->blockState.insert(currentBlockState(), state);
const auto nextBlock = currentBlock().next();
if (nextBlock.isValid()) {
QMetaObject::invokeMethod(
this,
[this, nextBlock] {
rehighlightBlock(nextBlock);
},
Qt::QueuedConnection);
}
}
void PlainTextSyntaxSpellCheckingHighlighter::unsetMisspelled([[maybe_unused]] int start, [[maybe_unused]] int count)
{
}
void PlainTextSyntaxSpellCheckingHighlighter::setMisspelled(int start, int count)
{
setMisspelledColor(d->misspelledColor);
for (const auto &range : d->spellCheckRanges) {
if (range.offset <= start && range.end() >= start + count) {
auto f = format(start);
f.setFontUnderline(true);
f.setUnderlineStyle(QTextCharFormat::SpellCheckUnderline);
f.setUnderlineColor(d->misspelledColor);
setFormat(start, count, f);
return;
}
}
}
void PlainTextSyntaxSpellCheckingHighlighter::applyFormat(int offset, int length, const KSyntaxHighlighting::Format &format)
{
if (format.spellCheck() && length > 0) {
if (d->spellCheckRanges.empty()) {
d->spellCheckRanges.emplace_back(offset, length);
} else if (d->spellCheckRanges.back().end() + 1 == offset) {
d->spellCheckRanges.back().length += length;
} else {
d->spellCheckRanges.emplace_back(offset, length);
}
}
if (format.isDefaultTextStyle(theme()) || length == 0) {
return;
}
QTextCharFormat tf;
if (format.hasTextColor(theme())) {
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);
}
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