Clang: implement current document filter

Filter is based on full token infos which come
from clang code model after token infos with pure
highlighting information.

Inprovements:
- functions also provide the return type after the signature
- now supports Q_PROPERTY
- all c++ features that clang 5.0 supports

Change-Id: If3e30d238984f39df8d2c3b9ba3ee085c4117f3d
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

src/libs/utils/linecolumn.h

@@ -27,6 +27,8 @@
 
 #include "optional.h"
 
+#include <QMetaType>
+
 namespace Utils {
 
 class LineColumn
@@ -57,3 +59,5 @@ public:
 using OptionalLineColumn = optional<LineColumn>;
 
 } // namespace Utils
+
+Q_DECLARE_METATYPE(Utils::LineColumn)

src/plugins/clangcodemodel/clangcurrentdocumentfilter.cpp

@@ -25,8 +25,28 @@
 
 #include "clangcurrentdocumentfilter.h"
 
+#include "clangeditordocumentprocessor.h"
+#include "clangutils.h"
+
+#include <clangsupport/tokeninfocontainer.h>
+
+#include <coreplugin/editormanager/editormanager.h>
+#include <coreplugin/editormanager/ieditor.h>
+
+#include <cplusplus/Icons.h>
+
 #include <cpptools/cpptoolsconstants.h>
 
+#include <texteditor/textdocument.h>
+
+#include <utils/algorithm.h>
+#include <utils/fuzzymatcher.h>
+#include <utils/linecolumn.h>
+#include <utils/textutils.h>
+#include <utils/qtcassert.h>
+
+#include <QRegularExpression>
+
 namespace ClangCodeModel {
 
 ClangCurrentDocumentFilter::ClangCurrentDocumentFilter()
@@ -36,22 +56,131 @@ ClangCurrentDocumentFilter::ClangCurrentDocumentFilter()
     setShortcutString(QString(QLatin1Char('.')));
     setPriority(High);
     setIncludedByDefault(false);
+
+    Core::EditorManager *editorManager = Core::EditorManager::instance();
+    connect(editorManager, &Core::EditorManager::currentEditorChanged,
+            this, &ClangCurrentDocumentFilter::onCurrentEditorChanged,
+            Qt::QueuedConnection);
+    connect(editorManager, &Core::EditorManager::editorAboutToClose,
+            this, &ClangCurrentDocumentFilter::onEditorAboutToClose,
+            Qt::QueuedConnection);
+}
+
+static QString addResultTypeToFunctionSignature(const QString &signature,
+                                                const ClangBackEnd::ExtraInfo &extraInfo)
+{
+    return signature + extraInfo.typeSpelling.toString() + QLatin1String(" -> ", 4)
+            + extraInfo.resultTypeSpelling.toString();
+}
+
+static QString addTypeToVariableName(const QString &name, const ClangBackEnd::ExtraInfo &extraInfo)
+{
+    return extraInfo.typeSpelling.toString() + QLatin1String(" ") + name;
+}
+
+static Core::LocatorFilterEntry makeEntry(Core::ILocatorFilter *filter,
+                                          const ClangBackEnd::TokenInfoContainer &info)
+{
+    const ClangBackEnd::ExtraInfo &extraInfo = info.extraInfo();
+    QString displayName = extraInfo.token;
+    ::Utils::LineColumn lineColumn(static_cast<int>(info.line()),
+                                   static_cast<int>(info.column()));
+    Core::LocatorFilterEntry entry(filter, displayName, qVariantFromValue(lineColumn));
+    QString extra;
+    ClangBackEnd::HighlightingType mainType = info.types().mainHighlightingType;
+    if (mainType == ClangBackEnd::HighlightingType::VirtualFunction
+            || mainType == ClangBackEnd::HighlightingType::Function) {
+        displayName = addResultTypeToFunctionSignature(displayName, extraInfo);
+        extra = extraInfo.semanticParentTypeSpelling.toString();
+    } else if (mainType == ClangBackEnd::HighlightingType::GlobalVariable
+               || mainType == ClangBackEnd::HighlightingType::Field
+               || mainType == ClangBackEnd::HighlightingType::QtProperty) {
+        displayName = addTypeToVariableName(displayName, extraInfo);
+        extra = extraInfo.semanticParentTypeSpelling.toString();
+    } else {
+        extra = extraInfo.typeSpelling.toString();
+    }
+    entry.displayName = displayName;
+    entry.extraInfo = extra;
+    entry.displayIcon = CPlusPlus::Icons::iconForType(Utils::iconTypeForToken(info));
+    return entry;
 }
 
 QList<Core::LocatorFilterEntry> ClangCurrentDocumentFilter::matchesFor(
-        QFutureInterface<Core::LocatorFilterEntry> &, const QString &)
+        QFutureInterface<Core::LocatorFilterEntry> &, const QString &entry)
 {
-    return QList<Core::LocatorFilterEntry>();
+    QList<Core::LocatorFilterEntry> goodEntries;
+    if (!m_currentEditor)
+        return goodEntries;
+
+    FuzzyMatcher::CaseSensitivity caseSesitivity = caseSensitivity(entry) == Qt::CaseSensitive
+            ? FuzzyMatcher::CaseSensitivity::CaseSensitive
+            : FuzzyMatcher::CaseSensitivity::CaseInsensitive;
+    const QRegularExpression regexp = FuzzyMatcher::createRegExp(entry, caseSesitivity);
+    if (!regexp.isValid())
+        return goodEntries;
+
+    using Internal::ClangEditorDocumentProcessor;
+    ClangEditorDocumentProcessor *processor = ClangEditorDocumentProcessor::get(m_currentPath);
+    if (!processor)
+        return goodEntries;
+
+    using TokInfoContainer = ClangBackEnd::TokenInfoContainer;
+    const QVector<TokInfoContainer> &infos = processor->tokenInfos();
+
+    for (const TokInfoContainer &info : infos) {
+        if (!info.extraInfo().declaration)
+            continue;
+        if (info.types().mainHighlightingType == ClangBackEnd::HighlightingType::LocalVariable)
+            continue;
+        QRegularExpressionMatch match = regexp.match(info.extraInfo().token);
+        if (match.hasMatch())
+            goodEntries.push_back(makeEntry(this, info));
+    }
+
+    return goodEntries;
 }
 
-void ClangCurrentDocumentFilter::accept(Core::LocatorFilterEntry, QString *, int *, int *) const
+void ClangCurrentDocumentFilter::accept(Core::LocatorFilterEntry selection,
+            QString *, int *, int *) const
 {
-
+    if (!m_currentEditor)
+        return;
+    auto lineColumn = qvariant_cast<::Utils::LineColumn>(selection.internalData);
+    Core::EditorManager::openEditorAt(m_currentPath, lineColumn.line,
+                                      lineColumn.column - 1);
 }
 
 void ClangCurrentDocumentFilter::refresh(QFutureInterface<void> &)
 {
+}
 
+void ClangCurrentDocumentFilter::reset()
+{
+    m_currentEditor = nullptr;
+    m_currentPath.clear();
+}
+
+void ClangCurrentDocumentFilter::onEditorAboutToClose(Core::IEditor *editorAboutToClose)
+{
+    if (!editorAboutToClose)
+        return;
+
+    if (m_currentEditor == editorAboutToClose)
+        reset();
+}
+
+void ClangCurrentDocumentFilter::onCurrentEditorChanged(Core::IEditor *newCurrent)
+{
+    if (newCurrent) {
+        m_currentEditor = newCurrent;
+        Core::IDocument *document = m_currentEditor->document();
+        QTC_ASSERT(document, return;);
+        auto *textDocument = qobject_cast<TextEditor::TextDocument *>(document);
+        m_currentPath = textDocument->filePath().toString();
+    } else {
+        reset();
+    }
 }
 
 } // namespace ClangCodeModel

src/plugins/clangcodemodel/clangcurrentdocumentfilter.h

@@ -27,6 +27,8 @@
 
 #include <coreplugin/locator/ilocatorfilter.h>
 
+namespace Core { class IEditor; }
+
 namespace ClangCodeModel {
 
 class ClangCurrentDocumentFilter : public  Core::ILocatorFilter
@@ -41,6 +43,14 @@ public:
     void accept(Core::LocatorFilterEntry selection,
                 QString *newText, int *selectionStart, int *selectionLength) const override;
     void refresh(QFutureInterface<void> &future) override;
+private:
+    void onEditorAboutToClose(Core::IEditor *editors);
+    void onCurrentEditorChanged(Core::IEditor *newCurrent);
+
+    void reset();
+
+    Core::IEditor *m_currentEditor = nullptr;
+    QString m_currentPath;
 };
 
 } // namespace ClangCodeModel

src/plugins/clangcodemodel/clangmodelmanagersupport.cpp

@@ -89,6 +89,9 @@ ModelManagerSupportClang::ModelManagerSupportClang()
     else
         m_followSymbol.reset(new CppTools::FollowSymbolUnderCursor);
 
+    CppTools::CppModelManager::instance()->setCurrentDocumentFilter(
+                std::make_unique<ClangCurrentDocumentFilter>());
+
     Core::EditorManager *editorManager = Core::EditorManager::instance();
     connect(editorManager, &Core::EditorManager::editorOpened,
             this, &ModelManagerSupportClang::onEditorOpened);