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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 <QtCore/qtextstream.h>
#include <QtWidgets/qtextedit.h>
#include "htmlhighlighter_p.h"
QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
namespace qdesigner_internal {
HtmlHighlighter::HtmlHighlighter(QTextEdit *textEdit)
: QSyntaxHighlighter(textEdit->document())
{
QTextCharFormat entityFormat;
entityFormat.setForeground(Qt::red);
setFormatFor(Entity, entityFormat);
QTextCharFormat tagFormat;
tagFormat.setForeground(Qt::darkMagenta);
tagFormat.setFontWeight(QFont::Bold);
setFormatFor(Tag, tagFormat);
QTextCharFormat commentFormat;
commentFormat.setForeground(Qt::gray);
commentFormat.setFontItalic(true);
setFormatFor(Comment, commentFormat);
QTextCharFormat attributeFormat;
attributeFormat.setForeground(Qt::black);
attributeFormat.setFontWeight(QFont::Bold);
setFormatFor(Attribute, attributeFormat);
QTextCharFormat valueFormat;
valueFormat.setForeground(Qt::blue);
setFormatFor(Value, valueFormat);
}
void HtmlHighlighter::setFormatFor(Construct construct,
const QTextCharFormat &format)
{
m_formats[construct] = format;
rehighlight();
}
void HtmlHighlighter::highlightBlock(const QString &text)
{
static const QChar tab = u'\t';
static const QChar space = u' ';
int state = previousBlockState();
qsizetype len = text.size();
qsizetype start = 0;
qsizetype pos = 0;
while (pos < len) {
switch (state) {
case NormalState:
default:
while (pos < len) {
QChar ch = text.at(pos);
if (ch == u'<') {
if (QStringView{text}.sliced(pos).startsWith("<!--"_L1)) {
state = InComment;
} else {
state = InTag;
start = pos;
while (pos < len && text.at(pos) != space
&& text.at(pos) != u'>'
&& text.at(pos) != tab
&& !QStringView{text}.sliced(pos).startsWith("/>"_L1)) {
++pos;
}
if (QStringView{text}.sliced(pos).startsWith("/>"_L1))
++pos;
setFormat(start, pos - start,
m_formats[Tag]);
break;
}
break;
}
if (ch == u'&') {
start = pos;
while (pos < len && text.at(pos++) != u';')
;
setFormat(start, pos - start,
m_formats[Entity]);
} else {
// No tag, comment or entity started, continue...
++pos;
}
}
break;
case InComment:
start = pos;
for ( ; pos < len; ++pos) {
if (QStringView{text}.sliced(pos).startsWith("-->"_L1)) {
pos += 3;
state = NormalState;
break;
}
}
setFormat(start, pos - start, m_formats[Comment]);
break;
case InTag:
QChar quote = QChar::Null;
while (pos < len) {
QChar ch = text.at(pos);
if (quote.isNull()) {
start = pos;
if (ch == '\''_L1 || ch == u'"') {
quote = ch;
} else if (ch == u'>') {
++pos;
setFormat(start, pos - start, m_formats[Tag]);
state = NormalState;
break;
} else if (QStringView{text}.sliced(pos).startsWith("/>"_L1)) {
pos += 2;
setFormat(start, pos - start, m_formats[Tag]);
state = NormalState;
break;
} else if (ch != space && text.at(pos) != tab) {
// Tag not ending, not a quote and no whitespace, so
// we must be dealing with an attribute.
++pos;
while (pos < len && text.at(pos) != space
&& text.at(pos) != tab
&& text.at(pos) != u'=')
++pos;
setFormat(start, pos - start, m_formats[Attribute]);
start = pos;
}
} else if (ch == quote) {
quote = QChar::Null;
// Anything quoted is a value
setFormat(start, pos - start, m_formats[Value]);
}
++pos;
}
break;
}
}
setCurrentBlockState(state);
}
} // namespace qdesigner_internal
QT_END_NAMESPACE
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