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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 "messagehighlighter.h"
#include <QtCore/QTextStream>
#include <QtWidgets/QTextEdit>
QT_BEGIN_NAMESPACE
MessageHighlighter::MessageHighlighter(QTextEdit *textEdit)
: QSyntaxHighlighter(textEdit->document())
{
QTextCharFormat entityFormat;
entityFormat.setForeground(Qt::red);
m_formats[Entity] = entityFormat;
QTextCharFormat tagFormat;
tagFormat.setForeground(Qt::darkMagenta);
m_formats[Tag] = tagFormat;
QTextCharFormat commentFormat;
commentFormat.setForeground(Qt::gray);
commentFormat.setFontItalic(true);
m_formats[Comment] = commentFormat;
QTextCharFormat attributeFormat;
attributeFormat.setForeground(Qt::black);
attributeFormat.setFontItalic(true);
m_formats[Attribute] = attributeFormat;
QTextCharFormat valueFormat;
valueFormat.setForeground(Qt::blue);
m_formats[Value] = valueFormat;
QTextCharFormat acceleratorFormat;
acceleratorFormat.setFontUnderline(true);
m_formats[Accelerator] = acceleratorFormat;
QTextCharFormat variableFormat;
variableFormat.setForeground(Qt::blue);
m_formats[Variable] = variableFormat;
rehighlight();
}
void MessageHighlighter::highlightBlock(const QString &text)
{
static const QLatin1Char tab = QLatin1Char('\t');
static const QLatin1Char space = QLatin1Char(' ');
static const QLatin1Char amp = QLatin1Char('&');
static const QLatin1Char endTag = QLatin1Char('>');
static const QLatin1Char quot = QLatin1Char('"');
static const QLatin1Char apos = QLatin1Char('\'');
static const QLatin1Char semicolon = QLatin1Char(';');
static const QLatin1Char equals = QLatin1Char('=');
static const QLatin1Char percent = QLatin1Char('%');
static const QLatin1String startComment = QLatin1String("<!--");
static const QLatin1String endComment = QLatin1String("-->");
static const QLatin1String endElement = QLatin1String("/>");
int state = previousBlockState();
int len = text.size();
int start = 0;
int pos = 0;
while (pos < len) {
switch (state) {
case NormalState:
default:
while (pos < len) {
QChar ch = text.at(pos);
if (ch == QLatin1Char('<')) {
if (text.mid(pos, 4) == startComment) {
state = InComment;
} else {
state = InTag;
start = pos;
while (pos < len && text.at(pos) != space
&& text.at(pos) != endTag
&& text.at(pos) != tab
&& text.mid(pos, 2) != endElement)
++pos;
if (text.mid(pos, 2) == endElement)
++pos;
setFormat(start, pos - start,
m_formats[Tag]);
break;
}
break;
} else if (ch == amp && pos + 1 < len) {
// Default is Accelerator
if (text.at(pos + 1).isLetterOrNumber())
setFormat(pos + 1, 1, m_formats[Accelerator]);
// When a semicolon follows assume an Entity
start = pos;
ch = text.at(++pos);
while (pos + 1 < len && ch != semicolon && ch.isLetterOrNumber())
ch = text.at(++pos);
if (ch == semicolon)
setFormat(start, pos - start + 1, m_formats[Entity]);
} else if (ch == percent) {
start = pos;
// %[1-9]*
for (++pos; pos < len && text.at(pos).isDigit(); ++pos) {}
// %n
if (pos < len && pos == start + 1 && text.at(pos) == QLatin1Char('n'))
++pos;
setFormat(start, pos - start, m_formats[Variable]);
} else {
// No tag, comment or entity started, continue...
++pos;
}
}
break;
case InComment:
start = pos;
while (pos < len) {
if (text.mid(pos, 3) == endComment) {
pos += 3;
state = NormalState;
break;
} else {
++pos;
}
}
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 == apos || ch == quot) {
quote = ch;
} else if (ch == endTag) {
++pos;
setFormat(start, pos - start, m_formats[Tag]);
state = NormalState;
break;
} else if (text.mid(pos, 2) == endElement) {
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) != equals)
++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);
}
QT_END_NAMESPACE
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