C++ insert definition: Use minimally qualified names.

Change-Id: I633dbc77557fc2b6563888103350612a262536ee
Reviewed-on: http://codereview.qt.nokia.com/2731

Reviewed-by: Leandro T. C. Melo <leandro.melo@nokia.com>

src/libs/cplusplus/CppRewriter.cpp

@@ -373,22 +373,35 @@ FullySpecifiedType SubstitutionMap::apply(const Name *name, Rewrite *) const
 }
 
 
-UseQualifiedNames::UseQualifiedNames()
+UseMinimalNames::UseMinimalNames(ClassOrNamespace *target)
+    : _target(target)
 {
 
 }
 
-UseQualifiedNames::~UseQualifiedNames()
+UseMinimalNames::~UseMinimalNames()
 {
 
 }
 
-FullySpecifiedType UseQualifiedNames::apply(const Name *name, Rewrite *rewrite) const
+static bool symbolIdentical(Symbol *s1, Symbol *s2)
+{
+    if (!s1 || !s2)
+        return false;
+    if (s1->line() != s2->line())
+        return false;
+    if (s1->column() != s2->column())
+        return false;
+
+    return QByteArray(s1->fileName()) == QByteArray(s2->fileName());
+}
+
+FullySpecifiedType UseMinimalNames::apply(const Name *name, Rewrite *rewrite) const
 {
     SubstitutionEnvironment *env = rewrite->env;
     Scope *scope = env->scope();
 
-    if (name->isQualifiedNameId() || name->isTemplateNameId())
+    if (name->isTemplateNameId())
         return FullySpecifiedType();
 
     if (! scope)
@@ -401,11 +414,22 @@ FullySpecifiedType UseQualifiedNames::apply(const Name *name, Rewrite *rewrite)
     foreach (const LookupItem &r, results) {
         if (Symbol *d = r.declaration()) {
             const Name *n = 0;
-            foreach (const Name *c,  LookupContext::fullyQualifiedName(d)) {
+            QList<const Name *> names = LookupContext::fullyQualifiedName(d);
+            for (int i = names.size() - 1; i >= 0; --i) {
                 if (! n)
-                    n = c;
+                    n = names.at(i);
                 else
-                    n = control->qualifiedNameId(n, c);
+                    n = control->qualifiedNameId(names.at(i), n);
+                if (_target) {
+                    // minimize the qualifications
+                    const QList<LookupItem> tresults = _target->lookup(n);
+                    foreach (const LookupItem &tr, tresults) {
+                        if (symbolIdentical(tr.declaration(), d)) {
+                            i = 0; // break outer
+                            break;
+                        }
+                    }
+                }
             }
 
             return control->namedType(n);
@@ -418,6 +442,18 @@ FullySpecifiedType UseQualifiedNames::apply(const Name *name, Rewrite *rewrite)
 }
 
 
+UseQualifiedNames::UseQualifiedNames()
+    : UseMinimalNames(0)
+{
+
+}
+
+UseQualifiedNames::~UseQualifiedNames()
+{
+
+}
+
+
 FullySpecifiedType rewriteType(const FullySpecifiedType &type,
                                SubstitutionEnvironment *env,
                                Control *control)

src/libs/cplusplus/CppRewriter.h

@@ -88,15 +88,24 @@ private:
     QList<QPair<const Name *, FullySpecifiedType> > _map;
 };
 
-class CPLUSPLUS_EXPORT UseQualifiedNames: public Substitution
+class CPLUSPLUS_EXPORT UseMinimalNames: public Substitution
 {
 public:
-    UseQualifiedNames();
-    virtual ~UseQualifiedNames();
+    UseMinimalNames(ClassOrNamespace *target);
+    virtual ~UseMinimalNames();
 
     virtual FullySpecifiedType apply(const Name *name, Rewrite *rewrite) const;
+
+private:
+    ClassOrNamespace *_target;
 };
 
+class CPLUSPLUS_EXPORT UseQualifiedNames: public UseMinimalNames
+{
+public:
+    UseQualifiedNames();
+    virtual ~UseQualifiedNames();
+};
 
 
 CPLUSPLUS_EXPORT FullySpecifiedType rewriteType(const FullySpecifiedType &type,

src/plugins/cppeditor/cppinsertdecldef.cpp

@@ -242,17 +242,33 @@ public:
         oo.setShowReturnTypes(true);
         oo.setShowArgumentNames(true);
 
-        //--
+        // make target lookup context
+        Document::Ptr targetDoc = targetFile.cppDocument();
+        Scope *targetScope = targetDoc->scopeAt(m_loc.line(), m_loc.column());
+        LookupContext targetContext(targetDoc, assistInterface()->snapshot());
+        ClassOrNamespace *targetCoN = targetContext.lookupType(targetScope);
+        if (!targetCoN)
+            targetCoN = targetContext.globalNamespace();
+
+        // setup rewriting to get minimally qualified names
         SubstitutionEnvironment env;
         env.setContext(assistInterface()->context());
         env.switchScope(m_decl->enclosingScope());
-        UseQualifiedNames q;
+        UseMinimalNames q(targetCoN);
         env.enter(&q);
-
         Control *control = assistInterface()->context().control().data();
+
+        // rewrite the function type
         FullySpecifiedType tn = rewriteType(m_decl->type(), &env, control);
-        QString name = oo(LookupContext::fullyQualifiedName(m_decl));
-        //--
+
+        // rewrite the function name
+        QString name;
+        const FullySpecifiedType nametype = rewriteType(control->namedType(m_decl->name()), &env, control);
+        if (NamedType *nt = nametype.type()->asNamedType()) {
+            name = oo(nt->name());
+        } else {
+            name = oo(LookupContext::fullyQualifiedName(m_decl));
+        }
 
         QString defText = oo.prettyType(tn, name) + "\n{\n}";