CppEditor: Do not highlight C++ and Qt keywords for C

Task-number: QTCREATORBUG-2818
Task-number: QTCREATORBUG-18004
Change-Id: Ibca60a1711c827dd8b4c0486bff3d49b19a61d8b
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/libs/3rdparty/cplusplus/Token.h

@@ -407,6 +407,16 @@ struct LanguageFeatures
         return features;
     }
 
+    bool operator==(const LanguageFeatures &other) const
+    {
+        return flags == other.flags;
+    }
+
+    bool operator!=(const LanguageFeatures &other) const
+    {
+        return flags != other.flags;
+    }
+
     union {
         unsigned int flags;
         struct {

src/plugins/cppeditor/cppeditordocument.cpp

@@ -401,7 +401,15 @@ CppTools::BaseEditorDocumentProcessor *CppEditorDocument::processor()
         connect(m_processor.data(), &CppTools::BaseEditorDocumentProcessor::ifdefedOutBlocksUpdated,
                 this, &CppEditorDocument::ifdefedOutBlocksUpdated);
         connect(m_processor.data(), &CppTools::BaseEditorDocumentProcessor::cppDocumentUpdated,
-                this, &CppEditorDocument::cppDocumentUpdated);
+                [this](const CPlusPlus::Document::Ptr document) {
+                    // Update syntax highlighter
+                    auto *highlighter = qobject_cast<CppHighlighter *>(syntaxHighlighter());
+                    highlighter->setLanguageFeatures(document->languageFeatures());
+
+                    // Forward signal
+                    emit cppDocumentUpdated(document);
+
+        });
         connect(m_processor.data(), &CppTools::BaseEditorDocumentProcessor::semanticInfoUpdated,
                 this, &CppEditorDocument::semanticInfoUpdated);
     }

src/plugins/cppeditor/cpphighlighter.cpp

@@ -70,15 +70,8 @@ void CppHighlighter::highlightBlock(const QString &text)
 
     int braceDepth = initialBraceDepth;
 
-    // FIXME: Check defaults or get from document.
-    LanguageFeatures features;
-    features.cxx11Enabled = true;
-    features.cxxEnabled = true;
-    features.c99Enabled = true;
-    features.objCEnabled = true;
-
     SimpleLexer tokenize;
-    tokenize.setLanguageFeatures(features);
+    tokenize.setLanguageFeatures(m_languageFeatures);
 
     int initialLexerState = lexerState;
     const Tokens tokens = tokenize(text, initialLexerState);
@@ -215,7 +208,8 @@ void CppHighlighter::highlightBlock(const QString &text)
             }
 
         } else if (tk.isKeyword()
-                   || CppTools::isQtKeyword(text.midRef(tk.utf16charsBegin(), tk.utf16chars()))
+                   || (m_languageFeatures.qtKeywordsEnabled
+                       && CppTools::isQtKeyword(text.midRef(tk.utf16charsBegin(), tk.utf16chars())))
                    || tk.isObjCAtKeyword()) {
             setFormat(tk.utf16charsBegin(), tk.utf16chars(), formatForCategory(CppKeywordFormat));
         } else if (tk.isPrimitiveType()) {
@@ -281,6 +275,13 @@ void CppHighlighter::highlightBlock(const QString &text)
     setCurrentBlockState((braceDepth << 8) | tokenize.state());
 }
 
+void CppHighlighter::setLanguageFeatures(const LanguageFeatures &languageFeatures)
+{
+    if (languageFeatures != m_languageFeatures) {
+        m_languageFeatures = languageFeatures;
+        rehighlight();
+    }
+}
 
 bool CppHighlighter::isPPKeyword(const QStringRef &text) const
 {

src/plugins/cppeditor/cpphighlighter.h

@@ -27,6 +27,8 @@
 
 #include <texteditor/syntaxhighlighter.h>
 
+#include <cplusplus/Token.h>
+
 #include <QTextCharFormat>
 
 namespace CppEditor {
@@ -42,7 +44,8 @@ class CppHighlighter : public TextEditor::SyntaxHighlighter
 public:
     CppHighlighter(QTextDocument *document = 0);
 
-    virtual void highlightBlock(const QString &text);
+    void setLanguageFeatures(const CPlusPlus::LanguageFeatures &languageFeatures);
+    void highlightBlock(const QString &text) override;
 
 private:
     void highlightWord(QStringRef word, int position, int length);
@@ -53,6 +56,9 @@ private:
                                  int length);
 
     bool isPPKeyword(const QStringRef &text) const;
+
+private:
+    CPlusPlus::LanguageFeatures m_languageFeatures = CPlusPlus::LanguageFeatures::defaultFeatures();
 };
 
 } // namespace Internal