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Qt 解析xml并高亮显示模式校验错误部分
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作者:
admin
时间:
2022-7-1 16:56
标题:
Qt 解析xml并高亮显示模式校验错误部分
#ifndef XMLSYNTAXHIGHLIGHTER_H
#define XMLSYNTAXHIGHLIGHTER_H
#include <QtCore/QRegExp>
#include <QtGui/QSyntaxHighlighter>
class XmlSyntaxHighlighter : public QSyntaxHighlighter
{
public:
explicit XmlSyntaxHighlighter(QTextDocument *parent = nullptr);
protected:
virtual void highlightBlock(const QString &text);
private:
struct HighlightingRule
{
QRegExp pattern;
QTextCharFormat format;
};
QVector<HighlightingRule> highlightingRules;
QRegExp commentStartExpression;
QRegExp commentEndExpression;
QTextCharFormat tagFormat;
QTextCharFormat attributeFormat;
QTextCharFormat attributeContentFormat;
QTextCharFormat commentFormat;
};
#endif
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "ui_schema.h"
//! [0]
class MainWindow : public QMainWindow,
private Ui::SchemaMainWindow
{
Q_OBJECT
public:
MainWindow();
private Q_SLOTS:
void schemaSelected(int index);
void instanceSelected(int index);
void validate();
void textChanged();
private:
void moveCursor(int line, int column);
};
//! [0]
#endif
#include "xmlsyntaxhighlighter.h"
XmlSyntaxHighlighter::XmlSyntaxHighlighter(QTextDocument *parent)
: QSyntaxHighlighter(parent)
{
HighlightingRule rule;
// tag format
tagFormat.setForeground(Qt::darkBlue);
tagFormat.setFontWeight(QFont::Bold);
rule.pattern = QRegExp("(<[a-zA-Z:]+\\b|<\\?[a-zA-Z:]+\\b|\\?>|>|/>|</[a-zA-Z:]+>)");
rule.format = tagFormat;
highlightingRules.append(rule);
// attribute format
attributeFormat.setForeground(Qt::darkGreen);
rule.pattern = QRegExp("[a-zA-Z:]+=");
rule.format = attributeFormat;
highlightingRules.append(rule);
// attribute content format
attributeContentFormat.setForeground(Qt::red);
rule.pattern = QRegExp("("[^"]*"|'[^']*')");
rule.format = attributeContentFormat;
highlightingRules.append(rule);
commentFormat.setForeground(Qt::lightGray);
commentFormat.setFontItalic(true);
commentStartExpression = QRegExp("<!--");
commentEndExpression = QRegExp("-->");
}
void XmlSyntaxHighlighter::highlightBlock(const QString &text)
{
for (const HighlightingRule &rule : qAsConst(highlightingRules)) {
QRegExp expression(rule.pattern);
int index = text.indexOf(expression);
while (index >= 0) {
int length = expression.matchedLength();
setFormat(index, length, rule.format);
index = text.indexOf(expression, index + length);
}
}
setCurrentBlockState(0);
int startIndex = 0;
if (previousBlockState() != 1)
startIndex = text.indexOf(commentStartExpression);
while (startIndex >= 0) {
int endIndex = text.indexOf(commentEndExpression, startIndex);
int commentLength;
if (endIndex == -1) {
setCurrentBlockState(1);
commentLength = text.length() - startIndex;
} else {
commentLength = endIndex - startIndex
+ commentEndExpression.matchedLength();
}
setFormat(startIndex, commentLength, commentFormat);
startIndex = text.indexOf(commentStartExpression,
startIndex + commentLength);
}
}
#include <QtGui>
#include <QtXmlPatterns>
#include "mainwindow.h"
#include "xmlsyntaxhighlighter.h"
//! [4]
class MessageHandler : public QAbstractMessageHandler
{
public:
MessageHandler()
: QAbstractMessageHandler(0)
{
}
QString statusMessage() const
{
return m_description;
}
int line() const
{
return m_sourceLocation.line();
}
int column() const
{
return m_sourceLocation.column();
}
protected:
virtual void handleMessage(QtMsgType type, const QString &description,
const QUrl &identifier, const QSourceLocation &sourceLocation)
{
Q_UNUSED(type);
Q_UNUSED(identifier);
m_description = description;
m_sourceLocation = sourceLocation;
}
private:
QString m_description;
QSourceLocation m_sourceLocation;
};
//! [4]
//! [0]
MainWindow::MainWindow()
{
setupUi(this);
new XmlSyntaxHighlighter(schemaView->document());
new XmlSyntaxHighlighter(instanceEdit->document());
schemaSelection->addItem(tr("Contact Schema"));
schemaSelection->addItem(tr("Recipe Schema"));
schemaSelection->addItem(tr("Order Schema"));
instanceSelection->addItem(tr("Valid Contact Instance"));
instanceSelection->addItem(tr("Invalid Contact Instance"));
connect(schemaSelection, SIGNAL(currentIndexChanged(int)), SLOT(schemaSelected(int)));
connect(instanceSelection, SIGNAL(currentIndexChanged(int)), SLOT(instanceSelected(int)));
connect(validateButton, SIGNAL(clicked()), SLOT(validate()));
connect(instanceEdit, SIGNAL(textChanged()), SLOT(textChanged()));
validationStatus->setAlignment(Qt::AlignCenter | Qt::AlignVCenter);
schemaSelected(0);
instanceSelected(0);
}
//! [0]
//! [1]
void MainWindow::schemaSelected(int index)
{
instanceSelection->clear();
if (index == 0) {
instanceSelection->addItem(tr("Valid Contact Instance"));
instanceSelection->addItem(tr("Invalid Contact Instance"));
} else if (index == 1) {
instanceSelection->addItem(tr("Valid Recipe Instance"));
instanceSelection->addItem(tr("Invalid Recipe Instance"));
} else if (index == 2) {
instanceSelection->addItem(tr("Valid Order Instance"));
instanceSelection->addItem(tr("Invalid Order Instance"));
}
textChanged();
const QString fileName = QStringLiteral(":/schema_")
+ QString::number(index) + QStringLiteral(".xsd");
QFile schemaFile(fileName);
if (!schemaFile.open(QIODevice::ReadOnly)) {
qWarning() << "Cannot open" << QDir::toNativeSeparators(fileName)
<< ':' << schemaFile.errorString();
return;
}
const QString schemaText(QString::fromUtf8(schemaFile.readAll()));
schemaView->setPlainText(schemaText);
validate();
}
//! [1]
//! [2]
void MainWindow::instanceSelected(int index)
{
if (index < 0) {
instanceEdit->setPlainText(QString());
return;
}
const QString fileName = QStringLiteral(":/instance_")
+ QString::number(2 * schemaSelection->currentIndex() + index)
+ QStringLiteral(".xml");
QFile instanceFile(fileName);
if (!instanceFile.open(QIODevice::ReadOnly)) {
qWarning() << "Cannot open" << QDir::toNativeSeparators(fileName)
<< ':' << instanceFile.errorString();
return;
}
const QString instanceText(QString::fromUtf8(instanceFile.readAll()));
instanceEdit->setPlainText(instanceText);
validate();
}
//! [2]
//! [3]
void MainWindow::validate()
{
const QByteArray schemaData = schemaView->toPlainText().toUtf8();
const QByteArray instanceData = instanceEdit->toPlainText().toUtf8();
MessageHandler messageHandler;
QXmlSchema schema;
schema.setMessageHandler(&messageHandler);
schema.load(schemaData);
bool errorOccurred = false;
if (!schema.isValid()) {
errorOccurred = true;
} else {
QXmlSchemaValidator validator(schema);
if (!validator.validate(instanceData))
errorOccurred = true;
}
if (errorOccurred) {
validationStatus->setText(messageHandler.statusMessage());
moveCursor(messageHandler.line(), messageHandler.column());
} else {
validationStatus->setText(tr("validation successful"));
}
const QString styleSheet = QString("QLabel {background: %1; padding: 3px}")
.arg(errorOccurred ? QColor(Qt::red).lighter(160).name() :
QColor(Qt::green).lighter(160).name());
validationStatus->setStyleSheet(styleSheet);
}
//! [3]
void MainWindow::textChanged()
{
instanceEdit->setExtraSelections(QList<QTextEdit::ExtraSelection>());
}
void MainWindow::moveCursor(int line, int column)
{
instanceEdit->moveCursor(QTextCursor::Start);
for (int i = 1; i < line; ++i)
instanceEdit->moveCursor(QTextCursor::Down);
for (int i = 1; i < column; ++i)
instanceEdit->moveCursor(QTextCursor::Right);
QList<QTextEdit::ExtraSelection> extraSelections;
QTextEdit::ExtraSelection selection;
const QColor lineColor = QColor(Qt::red).lighter(160);
selection.format.setBackground(lineColor);
selection.format.setProperty(QTextFormat::FullWidthSelection, true);
selection.cursor = instanceEdit->textCursor();
selection.cursor.clearSelection();
extraSelections.append(selection);
instanceEdit->setExtraSelections(extraSelections);
instanceEdit->setFocus();
}
#include <QtGui>
#include "mainwindow.h"
//! [0]
int main(int argc, char* argv[])
{
Q_INIT_RESOURCE(schema);
QApplication app(argc, argv);
MainWindow* const window = new MainWindow;
window->show();
return app.exec();
}
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