Implement context help for pro file editor

Task-number: QTCREATORBUG-6325
Change-Id: Ie8b2eb582eb527eac6af56d0c69a8ae1dafdc1df
Reviewed-by: Leandro Melo <leandro.melo@nokia.com>

11 files changed, 332 insertions, 6 deletions

diff --git a/src/libs/utils/htmldocextractor.cpp b/src/libs/utils/htmldocextractor.cpp
index f375bf1d06..36983d22d9 100644
--- a/src/libs/utils/htmldocextractor.cpp
+++ b/src/libs/utils/htmldocextractor.cpp
@@ -147,10 +147,10 @@ QString HtmlDocExtractor::getQmlComponentDescription(const QString &html, const
 
 QString HtmlDocExtractor::getQmlPropertyDescription(const QString &html, const QString &mark) const
 {
-    QString startMark = QString("<a name=\"%1-prop\">").arg(mark);
+    QString startMark = QString::fromLatin1("<a name=\"%1-prop\">").arg(mark);
     int index = html.indexOf(startMark);
     if (index == -1) {
-        startMark = QString("<a name=\"%1-signal\">").arg(mark);
+        startMark = QString::fromLatin1("<a name=\"%1-signal\">").arg(mark);
         index = html.indexOf(startMark);
     }
     if (index == -1)
@@ -166,6 +166,42 @@ QString HtmlDocExtractor::getQmlPropertyDescription(const QString &html, const Q
     return contents;
 }
 
+QString HtmlDocExtractor::getQMakeVariableOrFunctionDescription(const QString &html,
+                                                                const QString &mark) const
+{
+    const QString startMark = QString::fromLatin1("<a name=\"%1\"></a>").arg(mark);
+    int index = html.indexOf(startMark);
+    if (index == -1)
+        return QString();
+
+    QString contents = html.mid(index + startMark.size());
+    index = contents.indexOf(QLatin1String("<!-- @@@qmake"));
+    if (index == -1)
+        return QString();
+    contents = contents.left(index);
+    processOutput(&contents);
+
+    return contents;
+}
+
+QString HtmlDocExtractor::getQMakeFunctionId(const QString &html,
+                                             const QString &mark) const
+{
+    const QString startMark = QString::fromLatin1("<a name=\"%1-").arg(mark);
+    const int startIndex = html.indexOf(startMark);
+    if (startIndex == -1)
+        return QString();
+
+    const int startKeyIndex = html.indexOf(mark, startIndex);
+
+    const QString endMark = QLatin1String("\"></a>");
+    const int endKeyIndex = html.indexOf(endMark, startKeyIndex);
+    if (endKeyIndex == -1)
+        return QString();
+
+    return html.mid(startKeyIndex, endKeyIndex - startKeyIndex);
+}
+
 QString HtmlDocExtractor::getClassOrNamespaceMemberDescription(const QString &html,
                                                                const QString &startMark,
                                                                const QString &endMark) const
@@ -206,9 +242,18 @@ void HtmlDocExtractor::processOutput(QString *html) const
     if (m_mode == FirstParagraph) {
         // Try to get the entire first paragraph, but if one is not found or if its opening
         // tag is not in the very beginning (using an empirical value as the limit) the html
-        // is cleared to avoid too much content.
+        // is cleared to avoid too much content. In case the first paragraph looks like:
+        // <p><i>This is only used on the Maemo platform.</i></p>
+        // or: <p><tt>This is used on Windows only.</tt></p>
+        // or: <p>[Conditional]</p>
+        // include also the next paragraph.
         int index = html->indexOf(QLatin1String("<p>"));
         if (index != -1 && index < 400) {
+            if (html->indexOf(QLatin1String("<p><i>")) == index ||
+                    html->indexOf(QLatin1String("<p><tt>")) == index ||
+                    html->indexOf(QLatin1String("<p>[Conditional]</p>")) == index)
+                index = html->indexOf(QLatin1String("<p>"), index + 6); // skip the first paragraph
+
             index = html->indexOf(QLatin1String("</p>"), index + 3);
             if (index != -1) {
                 // Most paragraphs end with a period, but there are cases without punctuation
diff --git a/src/libs/utils/htmldocextractor.h b/src/libs/utils/htmldocextractor.h
index 68523ff151..508c5aff03 100644
--- a/src/libs/utils/htmldocextractor.h
+++ b/src/libs/utils/htmldocextractor.h
@@ -62,6 +62,10 @@ public:
                                    const bool mainOverload = true) const;
     QString getQmlComponentDescription(const QString &html, const QString &mark) const;
     QString getQmlPropertyDescription(const QString &html, const QString &mark) const;
+    QString getQMakeVariableOrFunctionDescription(const QString &html,
+                                                  const QString &mark) const;
+    QString getQMakeFunctionId(const QString &html,
+                               const QString &mark) const;
 
 private:
     QString getClassOrNamespaceMemberDescription(const QString &html,
diff --git a/src/plugins/help/helpplugin.cpp b/src/plugins/help/helpplugin.cpp
index 04e0645b9b..addc4b9909 100644
--- a/src/plugins/help/helpplugin.cpp
+++ b/src/plugins/help/helpplugin.cpp
@@ -883,6 +883,12 @@ void HelpPlugin::activateContext()
     if (IContext *context = m_core->currentContextObject()) {
         m_idFromContext = context->contextHelpId();
         links = Core::HelpManager::instance()->linksForIdentifier(m_idFromContext);
+        if (links.isEmpty()) {
+            // Maybe this is already an URL...
+            QUrl url(m_idFromContext);
+            if (url.isValid())
+                links.insert(m_idFromContext, m_idFromContext);
+        }
     }
 
     if (HelpViewer* viewer = viewerForContextMode()) {
diff --git a/src/plugins/qt4projectmanager/profilehoverhandler.cpp b/src/plugins/qt4projectmanager/profilehoverhandler.cpp
new file mode 100644
index 0000000000..4320834642
--- /dev/null
+++ b/src/plugins/qt4projectmanager/profilehoverhandler.cpp
@@ -0,0 +1,170 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (info@qt.nokia.com)
+**
+**
+** GNU Lesser General Public License Usage
+**
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this file.
+** Please review the following information to ensure the GNU Lesser General
+** Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** Other Usage
+**
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at info@qt.nokia.com.
+**
+**************************************************************************/
+
+#include "profilehoverhandler.h"
+#include "profileeditor.h"
+#include "profilekeywords.h"
+
+#include <coreplugin/editormanager/ieditor.h>
+#include <coreplugin/editormanager/editormanager.h>
+#include <coreplugin/helpmanager.h>
+#include <extensionsystem/pluginmanager.h>
+#include <texteditor/itexteditor.h>
+#include <texteditor/basetexteditor.h>
+#include <texteditor/helpitem.h>
+#include <texteditor/tooltip/tooltip.h>
+#include <utils/htmldocextractor.h>
+
+#include <QtGui/QTextCursor>
+#include <QtGui/QTextBlock>
+#include <QtCore/QUrl>
+
+using namespace Qt4ProjectManager;
+using namespace Qt4ProjectManager::Internal;
+using namespace Core;
+
+ProFileHoverHandler::ProFileHoverHandler(QObject *parent)
+  : BaseHoverHandler(parent),
+    m_manualKind(UnknownManual)
+{
+}
+
+ProFileHoverHandler::~ProFileHoverHandler()
+{}
+
+bool ProFileHoverHandler::acceptEditor(IEditor *editor)
+{
+    if (qobject_cast<ProFileEditor *>(editor) != 0)
+        return true;
+    return false;
+}
+
+void ProFileHoverHandler::identifyMatch(TextEditor::ITextEditor *editor, int pos)
+{
+    m_docFragment = QString();
+    m_manualKind = UnknownManual;
+    if (ProFileEditorWidget *proFileEditor = qobject_cast<ProFileEditorWidget *>(editor->widget())) {
+        if (!proFileEditor->extraSelectionTooltip(pos).isEmpty()) {
+            setToolTip(proFileEditor->extraSelectionTooltip(pos));
+        } else {
+            QTextDocument *document = proFileEditor->document();
+            QTextBlock block = document->findBlock(pos);
+            identifyQMakeKeyword(block.text(), pos - block.position());
+
+            if (m_manualKind != UnknownManual) {
+                QUrl url(QString::fromLatin1("qthelp://com.trolltech.qmake/qdoc/qmake-%1-reference.html#%2")
+                        .arg(manualName()).arg(m_docFragment));
+                setLastHelpItemIdentified(TextEditor::HelpItem(url.toString(),
+                                          m_docFragment, TextEditor::HelpItem::QMakeVariableOfFunction));
+            } else {
+                // General qmake manual will be shown outside any function or variable
+                setLastHelpItemIdentified(TextEditor::HelpItem(QLatin1String("qmake"),
+                                          TextEditor::HelpItem::Unknown));
+            }
+        }
+    }
+}
+
+void ProFileHoverHandler::identifyQMakeKeyword(const QString &text, int pos)
+{
+    if (text.isEmpty())
+        return;
+
+    QString buf;
+
+    for (int i = 0; i < text.length(); ++i) {
+        const QChar c = text.at(i);
+        bool checkBuffer = false;
+        if (c.isLetter() || c == QLatin1Char('_') || c == QLatin1Char('.') || c.isDigit()) {
+            buf += c;
+            if (i == text.length() - 1)
+                checkBuffer = true;
+        } else {
+            checkBuffer = true;
+        }
+        if (checkBuffer) {
+            if (!buf.isEmpty()) {
+                if ((i >= pos) && (i - buf.size() <= pos)) {
+                    if (ProFileKeywords::isFunction(buf))
+                        identifyDocFragment(FunctionManual, buf);
+                    else if (ProFileKeywords::isVariable(buf))
+                        identifyDocFragment(VariableManual, buf);
+                    break;
+                }
+                buf.clear();
+            } else {
+                if (i >= pos)
+                    break; // we are after the tooltip pos
+            }
+            if (c == '#')
+                break; // comment start
+        }
+    }
+}
+
+QString ProFileHoverHandler::manualName() const
+{
+    if (m_manualKind == FunctionManual)
+        return QLatin1String("function");
+    else if (m_manualKind == VariableManual)
+        return QLatin1String("variable");
+    return QString();
+}
+
+void ProFileHoverHandler::identifyDocFragment(ProFileHoverHandler::ManualKind manualKind,
+                                        const QString &keyword)
+{
+    m_manualKind = manualKind;
+    m_docFragment = keyword.toLower();
+    // Special case: _PRO_FILE_ and _PRO_FILE_PWD_ ids
+    // don't have starting and ending '_'.
+    if (m_docFragment.startsWith(QLatin1Char('_')))
+        m_docFragment = m_docFragment.mid(1);
+    if (m_docFragment.endsWith(QLatin1Char('_')))
+        m_docFragment = m_docFragment.left(m_docFragment.size() - 1);
+    m_docFragment.replace(QLatin1Char('.'), QLatin1Char('-'));
+    m_docFragment.replace(QLatin1Char('_'), QLatin1Char('-'));
+
+    if (m_manualKind == FunctionManual) {
+        QUrl url(QString::fromLatin1("qthelp://com.trolltech.qmake/qdoc/qmake-%1-reference.html").arg(manualName()));
+        const QByteArray &html = Core::HelpManager::instance()->fileData(url);
+
+        Utils::HtmlDocExtractor htmlExtractor;
+        htmlExtractor.setMode(Utils::HtmlDocExtractor::FirstParagraph);
+
+        // Document fragment of qmake function is retrieved from docs.
+        // E.g. in case of the keyword "find" the document fragment
+        // parsed from docs is "find-variablename-substr".
+        m_docFragment = htmlExtractor.getQMakeFunctionId(html, m_docFragment);
+    }
+}
+
diff --git a/src/plugins/qt4projectmanager/profilehoverhandler.h b/src/plugins/qt4projectmanager/profilehoverhandler.h
new file mode 100644
index 0000000000..32b43c051f
--- /dev/null
+++ b/src/plugins/qt4projectmanager/profilehoverhandler.h
@@ -0,0 +1,87 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (info@qt.nokia.com)
+**
+**
+** GNU Lesser General Public License Usage
+**
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this file.
+** Please review the following information to ensure the GNU Lesser General
+** Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** Other Usage
+**
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at info@qt.nokia.com.
+**
+**************************************************************************/
+
+#ifndef PROFILEHOVERHANDLER_H
+#define PROFILEHOVERHANDLER_H
+
+#include <texteditor/basehoverhandler.h>
+
+#include <QtCore/QObject>
+
+QT_BEGIN_NAMESPACE
+class QUrl;
+QT_END_NAMESPACE
+
+namespace Core {
+class IEditor;
+}
+
+namespace TextEditor {
+class ITextEditor;
+}
+
+namespace Qt4ProjectManager {
+namespace Internal {
+
+class ProFileHoverHandler : public TextEditor::BaseHoverHandler
+{
+    Q_OBJECT
+public:
+    ProFileHoverHandler(QObject *parent = 0);
+    virtual ~ProFileHoverHandler();
+
+signals:
+    void creatorHelpRequested(const QUrl &url);
+
+private:
+    virtual bool acceptEditor(Core::IEditor *editor);
+    virtual void identifyMatch(TextEditor::ITextEditor *editor, int pos);
+    void identifyQMakeKeyword(const QString &text, int pos);
+
+    enum ManualKind {
+        VariableManual,
+        FunctionManual,
+        UnknownManual
+    };
+
+    QString manualName() const;
+    void identifyDocFragment(ManualKind manualKind,
+                       const QString &keyword);
+
+    QString m_docFragment;
+    ManualKind m_manualKind;
+};
+
+} // namespace Internal
+} // namespace Qt4ProjectManager
+
+#endif // PROFILEHOVERHANDLER_H
diff --git a/src/plugins/qt4projectmanager/qt4projectmanager.pro b/src/plugins/qt4projectmanager/qt4projectmanager.pro
index 81410e78fb..81c8548fdf 100644
--- a/src/plugins/qt4projectmanager/qt4projectmanager.pro
+++ b/src/plugins/qt4projectmanager/qt4projectmanager.pro
@@ -13,6 +13,7 @@ HEADERS += \
     profileeditor.h \
     profilehighlighter.h \
     profileeditorfactory.h \
+    profilehoverhandler.h \
     wizards/qtprojectparameters.h \
     wizards/guiappwizard.h \
     wizards/mobileapp.h \
@@ -75,6 +76,7 @@ SOURCES += qt4projectmanagerplugin.cpp \
     profileeditor.cpp \
     profilehighlighter.cpp \
     profileeditorfactory.cpp \
+    profilehoverhandler.cpp \
     wizards/qtprojectparameters.cpp \
     wizards/guiappwizard.cpp \
     wizards/mobileapp.cpp \
diff --git a/src/plugins/qt4projectmanager/qt4projectmanagerplugin.cpp b/src/plugins/qt4projectmanager/qt4projectmanagerplugin.cpp
index 00dac5e408..1c4cd99910 100644
--- a/src/plugins/qt4projectmanager/qt4projectmanagerplugin.cpp
+++ b/src/plugins/qt4projectmanager/qt4projectmanagerplugin.cpp
@@ -47,6 +47,7 @@
 #include "wizards/html5appwizard.h"
 #include "customwidgetwizard/customwidgetwizard.h"
 #include "profileeditorfactory.h"
+#include "profilehoverhandler.h"
 #include "qt4projectmanagerconstants.h"
 #include "qt4project.h"
 #include "profileeditor.h"
@@ -159,6 +160,7 @@ bool Qt4ProjectManagerPlugin::initialize(const QStringList &arguments, QString *
     addAutoReleasedObject(new WinCeQtVersionFactory);
 
     addAutoReleasedObject(new ProFileCompletionAssistProvider);
+    addAutoReleasedObject(new ProFileHoverHandler(this));
 
     // TODO reenable
     //m_embeddedPropertiesPage = new EmbeddedPropertiesPage;
diff --git a/src/plugins/texteditor/basehoverhandler.cpp b/src/plugins/texteditor/basehoverhandler.cpp
index 0a41dced8d..ae18e63b3b 100644
--- a/src/plugins/texteditor/basehoverhandler.cpp
+++ b/src/plugins/texteditor/basehoverhandler.cpp
@@ -157,8 +157,8 @@ void BaseHoverHandler::decorateToolTip()
         if (!contents.isEmpty()) {
             setToolTip(Qt::escape(toolTip()));
             appendToolTip(contents);
+            addF1ToToolTip();
         }
-        addF1ToToolTip();
     }
 }
 
diff --git a/src/plugins/texteditor/basehoverhandler.h b/src/plugins/texteditor/basehoverhandler.h
index d2cbeacef1..74c76d3798 100644
--- a/src/plugins/texteditor/basehoverhandler.h
+++ b/src/plugins/texteditor/basehoverhandler.h
@@ -61,8 +61,6 @@ public:
 
 private slots:
     void editorOpened(Core::IEditor *editor);
-
-public slots:
     void showToolTip(TextEditor::ITextEditor *editor, const QPoint &point, int pos);
     void updateContextHelpId(TextEditor::ITextEditor *editor, int pos);
 
diff --git a/src/plugins/texteditor/helpitem.cpp b/src/plugins/texteditor/helpitem.cpp
index af20367bf1..022d2eb59c 100644
--- a/src/plugins/texteditor/helpitem.cpp
+++ b/src/plugins/texteditor/helpitem.cpp
@@ -77,6 +77,8 @@ bool HelpItem::isValid() const
 {
     if (!Core::HelpManager::instance()->linksForIdentifier(m_helpId).isEmpty())
         return true;
+    if (QUrl(m_helpId).isValid())
+        return true;
     return false;
 }
 
@@ -90,6 +92,12 @@ QString HelpItem::extractContent(bool extended) const
 
     QString contents;
     QMap<QString, QUrl> helpLinks = Core::HelpManager::instance()->linksForIdentifier(m_helpId);
+    if (helpLinks.isEmpty()) {
+        // Maybe this is already an URL...
+        QUrl url(m_helpId);
+        if (url.isValid())
+            helpLinks.insert(m_helpId, m_helpId);
+    }
     foreach (const QUrl &url, helpLinks) {
         const QByteArray &html = Core::HelpManager::instance()->fileData(url);
         switch (m_category) {
@@ -117,6 +125,9 @@ QString HelpItem::extractContent(bool extended) const
         case QmlProperty:
             contents = htmlExtractor.getQmlPropertyDescription(html, m_docMark);
             break;
+        case QMakeVariableOfFunction:
+            contents = htmlExtractor.getQMakeVariableOrFunctionDescription(html, m_docMark);
+            break;
 
         default:
             break;
diff --git a/src/plugins/texteditor/helpitem.h b/src/plugins/texteditor/helpitem.h
index 0be6b7dc95..9f034165cf 100644
--- a/src/plugins/texteditor/helpitem.h
+++ b/src/plugins/texteditor/helpitem.h
@@ -51,6 +51,7 @@ public:
         Function,
         QmlComponent,
         QmlProperty,
+        QMakeVariableOfFunction,
         Unknown
     };