Add W3C XML Schema validation support

This was done by Tobias Koenig, as part of an internship at Trolltech/Qt
Software, started at Wed Oct 1 18:32:43 2008 +0200, and the last commit being
part of this commit dating Tue Feb 24 11:03:36 2009 +0100. This is work
consisting of about 650 commits squashed into one, where the first commit was
61b280386c1905a15690fdd917dcbc8eb09b6283, in the repository before Qt's history
cut.

7 files changed, 334 insertions, 1 deletions

diff --git a/examples/xmlpatterns/schema/main.cpp b/examples/xmlpatterns/schema/main.cpp
new file mode 100644
index 000000000..9537a877f
--- /dev/null
+++ b/examples/xmlpatterns/schema/main.cpp
@@ -0,0 +1,24 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the $MODULE$ of the Qt Toolkit.
+**
+** $TROLLTECH_DUAL_LICENSE$
+**
+****************************************************************************/
+
+#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();
+}
+//! [0]
diff --git a/examples/xmlpatterns/schema/mainwindow.cpp b/examples/xmlpatterns/schema/mainwindow.cpp
new file mode 100644
index 000000000..807a65b23
--- /dev/null
+++ b/examples/xmlpatterns/schema/mainwindow.cpp
@@ -0,0 +1,175 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the $MODULE$ of the Qt Toolkit.
+**
+** $TROLLTECH_DUAL_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+#include <QtXmlPatterns>
+
+#include "mainwindow.h"
+#include "xmlsyntaxhighlighter.h"
+
+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_messageType = type;
+            m_description = description;
+            m_sourceLocation = sourceLocation;
+        }
+
+    private:
+        QtMsgType m_messageType;
+        QString m_description;
+        QSourceLocation m_sourceLocation;
+};
+
+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);
+}
+
+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();
+
+    QFile schemaFile(QString(":/schema_%1.xsd").arg(index));
+    schemaFile.open(QIODevice::ReadOnly);
+    const QString schemaText(QString::fromLatin1(schemaFile.readAll()));
+    schemaView->setPlainText(schemaText);
+
+    validate();
+}
+
+void MainWindow::instanceSelected(int index)
+{
+    QFile instanceFile(QString(":/instance_%1.xml").arg((2*schemaSelection->currentIndex()) + index));
+    instanceFile.open(QIODevice::ReadOnly);
+    const QString instanceText(QString::fromLatin1(instanceFile.readAll()));
+    instanceEdit->setPlainText(instanceText);
+
+    validate();
+}
+
+void MainWindow::validate()
+{
+    const QByteArray schemaData = schemaView->toPlainText().toLatin1();
+    const QByteArray instanceData = instanceEdit->toPlainText().toLatin1();
+
+    MessageHandler messageHandler;
+
+    QXmlSchema schema;
+    schema.setMessageHandler(&messageHandler);
+
+    schema.load(schemaData, QUrl("http://dummySchemaUrl/"));
+
+    bool errorOccurred = false;
+    if (!schema.isValid()) {
+        errorOccurred = true;
+    } else {
+        QXmlSchemaValidator validator(schema);
+        if (!validator.validate(instanceData, QUrl("http://dummyInstanceUrl")))
+            errorOccurred = true;
+    }
+
+    if (errorOccurred) {
+        validationStatus->setText(messageHandler.statusMessage());
+        moveCursor(messageHandler.line(), messageHandler.column());
+    } else {
+        validationStatus->setText(tr("validation successful"));
+    }
+
+    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);
+}
+
+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();
+}
diff --git a/examples/xmlpatterns/schema/mainwindow.h b/examples/xmlpatterns/schema/mainwindow.h
new file mode 100644
index 000000000..e5dc2df50
--- /dev/null
+++ b/examples/xmlpatterns/schema/mainwindow.h
@@ -0,0 +1,38 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the $MODULE$ of the Qt Toolkit.
+**
+** $TROLLTECH_DUAL_LICENSE$
+**
+****************************************************************************/
+
+#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
diff --git a/examples/xmlpatterns/schema/schema.pro b/examples/xmlpatterns/schema/schema.pro
new file mode 100644
index 000000000..af32e0a39
--- /dev/null
+++ b/examples/xmlpatterns/schema/schema.pro
@@ -0,0 +1,11 @@
+QT          += xmlpatterns
+FORMS       += schema.ui
+HEADERS     = mainwindow.h ../shared/xmlsyntaxhighlighter.h
+RESOURCES   = schema.qrc
+SOURCES     = main.cpp mainwindow.cpp ../shared/xmlsyntaxhighlighter.cpp
+INCLUDEPATH += ../shared/
+
+target.path = $$[QT_INSTALL_EXAMPLES]/xmlpatterns/schema
+sources.files = $$SOURCES $$HEADERS $$RESOURCES *.pro *.xq *.html files
+sources.path = $$[QT_INSTALL_EXAMPLES]/xmlpatterns/schema
+INSTALLS += target sources
diff --git a/examples/xmlpatterns/schema/schema.qrc b/examples/xmlpatterns/schema/schema.qrc
new file mode 100644
index 000000000..eb7ddfd7c
--- /dev/null
+++ b/examples/xmlpatterns/schema/schema.qrc
@@ -0,0 +1,13 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource>
+    <file alias="schema_0.xsd">files/contact.xsd</file>
+    <file alias="schema_1.xsd">files/recipe.xsd</file>
+    <file alias="schema_2.xsd">files/order.xsd</file>
+    <file alias="instance_0.xml">files/valid_contact.xml</file>
+    <file alias="instance_1.xml">files/invalid_contact.xml</file>
+    <file alias="instance_2.xml">files/valid_recipe.xml</file>
+    <file alias="instance_3.xml">files/invalid_recipe.xml</file>
+    <file alias="instance_4.xml">files/valid_order.xml</file>
+    <file alias="instance_5.xml">files/invalid_order.xml</file>
+</qresource>
+</RCC>
diff --git a/examples/xmlpatterns/schema/schema.ui b/examples/xmlpatterns/schema/schema.ui
new file mode 100644
index 000000000..af7020ab6
--- /dev/null
+++ b/examples/xmlpatterns/schema/schema.ui
@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>SchemaMainWindow</class>
+ <widget class="QMainWindow" name="SchemaMainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>417</width>
+    <height>594</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MainWindow</string>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QGridLayout" name="gridLayout">
+    <item row="0" column="0" colspan="2">
+     <widget class="QLabel" name="schemaLabel">
+      <property name="text">
+       <string>XML Schema Document:</string>
+      </property>
+     </widget>
+    </item>
+    <item row="0" column="2" colspan="2">
+     <widget class="QComboBox" name="schemaSelection"/>
+    </item>
+    <item row="1" column="0" colspan="4">
+     <widget class="QTextBrowser" name="schemaView"/>
+    </item>
+    <item row="2" column="0" colspan="2">
+     <widget class="QLabel" name="instanceLabel">
+      <property name="text">
+       <string>XML Instance Document:</string>
+      </property>
+     </widget>
+    </item>
+    <item row="2" column="2" colspan="2">
+     <widget class="QComboBox" name="instanceSelection"/>
+    </item>
+    <item row="3" column="0" colspan="4">
+     <widget class="QTextEdit" name="instanceEdit"/>
+    </item>
+    <item row="4" column="0">
+     <widget class="QLabel" name="label">
+      <property name="text">
+       <string>Status:</string>
+      </property>
+     </widget>
+    </item>
+    <item row="4" column="1" colspan="2">
+     <widget class="QLabel" name="validationStatus">
+      <property name="text">
+       <string>not validated</string>
+      </property>
+     </widget>
+    </item>
+    <item row="4" column="3">
+     <widget class="QPushButton" name="validateButton">
+      <property name="text">
+       <string>Validate</string>
+      </property>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+  <widget class="QStatusBar" name="statusbar"/>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>
diff --git a/examples/xmlpatterns/xmlpatterns.pro b/examples/xmlpatterns/xmlpatterns.pro
index 1a5700522..3ff3e35af 100644
--- a/examples/xmlpatterns/xmlpatterns.pro
+++ b/examples/xmlpatterns/xmlpatterns.pro
@@ -2,7 +2,8 @@ TEMPLATE      = subdirs
 SUBDIRS       = recipes \
                 trafficinfo \
                 xquery  \
-                filetree
+                filetree \
+                schema
 
 # This example depends on QtWebkit as well.
 contains(QT_CONFIG, webkit):SUBDIRS += qobjectxmlmodel