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CppTools: Fix completing qt5 style signals/slots in connect()

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* Fix qualifying the member function, take namespace into account
* Fallback to usual completion if we cannot provide anything
* Ensure that the completion is not triggered outside connect() calls
* Change to a two step process:

    1. connect(obj, &         // offer class name completion
    2. connect(obj, &N::Foo:: // offer signal completions

  ...same for the 4th. argument.

Change-Id: Ifa4c74cde1b96ec7c544daaeefc47c4efdd8294a
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>
This commit is contained in:
Nikolai Kosjar
2015-02-17 17:47:41 +01:00
committed by Erik Verbruggen
parent f3a2795c3b
commit 21e9893b4b
3 changed files with 303 additions and 76 deletions
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292
src/plugins/cpptools/cppcompletionassist.cpp
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@@ -615,15 +615,186 @@ QString createQt4SignalOrSlot(CPlusPlus::Function *function, const Overview &ove
return QString::fromUtf8(normalized, normalized.size());
}
QString createQt5SignalOrSlot(CPlusPlus::Function *function, Class *klass)
QString createQt5SignalOrSlot(CPlusPlus::Function *function, const Overview &overview)
{
QString text;
text += Overview().prettyName(klass->name());
text += QLatin1String("::");
text += Overview().prettyName(function->name());
text += overview.prettyName(function->name());
return text;
}
/*!
\class BackwardsEater
\brief Checks strings and expressions before given position.
Similar to BackwardsScanner, but also can handle expressions. Ignores whitespace.
*/
class BackwardsEater
{
public:
explicit BackwardsEater(const CppCompletionAssistInterface *assistInterface, int position)
: m_position(position)
, m_assistInterface(assistInterface)
{
}
bool isPositionValid() const
{
return m_position >= 0;
}
bool eatConnectOpenParenthesis()
{
return eatString(QLatin1String("(")) && eatString(QLatin1String("connect"));
}
bool eatExpressionCommaAmpersand()
{
return eatString(QLatin1String("&")) && eatString(QLatin1String(",")) && eatExpression();
}
bool eatConnectOpenParenthesisExpressionCommaAmpersandExpressionComma()
{
return eatString(QLatin1String(","))
&& eatExpression()
&& eatExpressionCommaAmpersand()
&& eatConnectOpenParenthesis();
}
private:
bool eatExpression()
{
if (!isPositionValid())
return false;
maybeEatWhitespace();
QTextCursor cursor(m_assistInterface->textDocument());
cursor.setPosition(m_position + 1);
ExpressionUnderCursor expressionUnderCursor;
const QString expression = expressionUnderCursor(cursor);
if (expression.isEmpty())
return false;
m_position = m_position - expression.length();
return true;
}
bool eatString(const QString &string)
{
if (!isPositionValid())
return false;
if (string.isEmpty())
return true;
maybeEatWhitespace();
const int stringLength = string.length();
const int stringStart = m_position - (stringLength - 1);
if (stringStart < 0)
return false;
if (m_assistInterface->textAt(stringStart, stringLength) == string) {
m_position = stringStart - 1;
return true;
}
return false;
}
void maybeEatWhitespace()
{
while (isPositionValid() && m_assistInterface->characterAt(m_position).isSpace())
--m_position;
}
private:
int m_position;
const CppCompletionAssistInterface * const m_assistInterface;
};
bool canCompleteConnectSignalAt2ndArgument(const CppCompletionAssistInterface *assistInterface,
int startOfExpression)
{
BackwardsEater eater(assistInterface, startOfExpression);
return eater.isPositionValid()
&& eater.eatExpressionCommaAmpersand()
&& eater.eatConnectOpenParenthesis();
}
bool canCompleteConnectSignalAt4thArgument(const CppCompletionAssistInterface *assistInterface,
int startPosition)
{
BackwardsEater eater(assistInterface, startPosition);
return eater.isPositionValid()
&& eater.eatExpressionCommaAmpersand()
&& eater.eatConnectOpenParenthesisExpressionCommaAmpersandExpressionComma();
}
bool canCompleteClassNameAt2ndOr4thConnectArgument(
const CppCompletionAssistInterface *assistInterface,
int startPosition)
{
BackwardsEater eater(assistInterface, startPosition);
if (!eater.isPositionValid())
return false;
return eater.eatConnectOpenParenthesis()
|| eater.eatConnectOpenParenthesisExpressionCommaAmpersandExpressionComma();
}
ClassOrNamespace *classOrNamespaceFromLookupItem(const LookupItem &lookupItem,
const LookupContext &context)
{
const Name *name = 0;
if (Symbol *d = lookupItem.declaration()) {
if (Class *k = d->asClass())
name = k->name();
}
if (!name) {
FullySpecifiedType type = lookupItem.type().simplified();
if (PointerType *pointerType = type->asPointerType())
type = pointerType->elementType().simplified();
else
return 0; // not a pointer or a reference to a pointer.
NamedType *namedType = type->asNamedType();
if (!namedType) // not a class name.
return 0;
name = namedType->name();
}
return name ? context.lookupType(name, lookupItem.scope()) : 0;
}
Class *classFromLookupItem(const LookupItem &lookupItem, const LookupContext &context)
{
ClassOrNamespace *b = classOrNamespaceFromLookupItem(lookupItem, context);
if (!b)
return 0;
foreach (Symbol *s, b->symbols()) {
if (Class *klass = s->asClass())
return klass;
}
return 0;
}
const Name *minimalName(Symbol *symbol, Scope *targetScope, const LookupContext &context)
{
ClassOrNamespace *target = context.lookupType(targetScope);
if (!target)
target = context.globalNamespace();
return context.minimalName(symbol, target, context.bindings()->control().data());
}
} // Anonymous
// ------------------------------------
@@ -807,10 +978,8 @@ int InternalCppCompletionAssistProcessor::startOfOperator(int pos,
if (*kind == T_AMPER && tokenIdx > 0) {
const Token &previousToken = tokens.at(tokenIdx - 1);
if (previousToken.kind() == T_COMMA) {
if (previousToken.kind() == T_COMMA)
start = pos - (tk.utf16charOffset - previousToken.utf16charOffset) - 1;
QTC_CHECK(m_interface->characterAt(start) == QLatin1Char(','));
}
} else if (*kind == T_DOXY_COMMENT && !(tk.is(T_DOXY_COMMENT) || tk.is(T_CPP_DOXY_COMMENT))) {
*kind = T_EOF_SYMBOL;
start = pos;
@@ -895,18 +1064,6 @@ int InternalCppCompletionAssistProcessor::findStartOfName(int pos) const
return pos + 1;
}
static bool isPrecededByConnectAndOpenParenthesis(
const CppCompletionAssistInterface *assistInterface,
int startOfExpression)
{
QTC_ASSERT(startOfExpression >= 0, return false);
int beforeExpression = startOfExpression;
while (beforeExpression > 0 && assistInterface->characterAt(--beforeExpression).isSpace()) ;
const int pos = beforeExpression - 7;
return pos >= 0 && assistInterface->textAt(pos, 7) == QLatin1String("connect");
}
int InternalCppCompletionAssistProcessor::startCompletionHelper()
{
if (m_languageFeatures.objCEnabled) {
@@ -978,10 +1135,21 @@ int InternalCppCompletionAssistProcessor::startCompletionHelper()
startOfExpression = endOfExpression - expression.length();
if (m_model->m_completionOperator == T_AMPER) {
m_model->m_completionOperator
= isPrecededByConnectAndOpenParenthesis(m_interface.data(), startOfExpression)
? CompleteQt5SignalTrigger
: CompleteQtSlotTrigger;
// We expect 'expression' to be either "sender" or "receiver" in
// "connect(sender, &" or
// "connect(otherSender, &Foo::signal1, receiver, &"
const int beforeExpression = startOfExpression - 1;
if (canCompleteClassNameAt2ndOr4thConnectArgument(m_interface.data(), beforeExpression))
m_model->m_completionOperator = CompleteQt5SignalOrSlotClassNameTrigger;
} else if (m_model->m_completionOperator == T_COLON_COLON) {
// We expect 'expression' to be "Foo" in
// "connect(sender, &Foo::" or
// "connect(sender, &Bar::signal1, receiver, &Foo::"
const int beforeExpression = startOfExpression - 1;
if (canCompleteConnectSignalAt2ndArgument(m_interface.data(), beforeExpression))
m_model->m_completionOperator = CompleteQt5SignalTrigger;
else if (canCompleteConnectSignalAt4thArgument(m_interface.data(), beforeExpression))
m_model->m_completionOperator = CompleteQt5SlotTrigger;
} else if (m_model->m_completionOperator == T_LPAREN) {
if (expression.endsWith(QLatin1String("SIGNAL"))) {
m_model->m_completionOperator = T_SIGNAL;
@@ -1249,10 +1417,7 @@ int InternalCppCompletionAssistProcessor::startCompletionInternal(const QString
if (expression.isEmpty()) {
if (m_model->m_completionOperator == T_EOF_SYMBOL || m_model->m_completionOperator == T_COLON_COLON) {
(void) (*m_model->m_typeOfExpression)(expression.toUtf8(), scope);
globalCompletion(scope);
if (m_completions.isEmpty())
return -1;
return m_startPosition;
return globalCompletion(scope) ? m_startPosition : -1;
}
if (m_model->m_completionOperator == T_SIGNAL || m_model->m_completionOperator == T_SLOT) {
@@ -1304,10 +1469,12 @@ int InternalCppCompletionAssistProcessor::startCompletionInternal(const QString
}
return -1;
} else {
// nothing to do.
return -1;
} else if (m_model->m_completionOperator == CompleteQt5SignalOrSlotClassNameTrigger) {
// Fallback to global completion if we could not lookup sender/receiver object.
return globalCompletion(scope) ? m_startPosition : -1;
} else {
return -1; // nothing to do.
}
}
@@ -1338,13 +1505,20 @@ int InternalCppCompletionAssistProcessor::startCompletionInternal(const QString
return m_startPosition;
break;
case CompleteQt5SignalTrigger:
if (completeQtMethod(results, CompleteQt5Signals))
case CompleteQt5SignalOrSlotClassNameTrigger:
if (completeQtMethodClassName(results, scope) || globalCompletion(scope))
return m_startPosition;
break;
case CompleteQtSlotTrigger:
if (completeQtMethod(results, CompleteQt5Slots))
case CompleteQt5SignalTrigger:
// Fallback to scope completion if "X::" is a namespace and not a class.
if (completeQtMethod(results, CompleteQt5Signals) || completeScope(results))
return m_startPosition;
break;
case CompleteQt5SlotTrigger:
// Fallback to scope completion if "X::" is a namespace and not a class.
if (completeQtMethod(results, CompleteQt5Slots) || completeScope(results))
return m_startPosition;
break;
@@ -1356,13 +1530,13 @@ int InternalCppCompletionAssistProcessor::startCompletionInternal(const QString
return -1;
}
void InternalCppCompletionAssistProcessor::globalCompletion(Scope *currentScope)
bool InternalCppCompletionAssistProcessor::globalCompletion(Scope *currentScope)
{
const LookupContext &context = m_model->m_typeOfExpression->context();
if (m_model->m_completionOperator == T_COLON_COLON) {
completeNamespace(context.globalNamespace());
return;
return !m_completions.isEmpty();
}
QList<ClassOrNamespace *> usingBindings;
@@ -1431,6 +1605,7 @@ void InternalCppCompletionAssistProcessor::globalCompletion(Scope *currentScope)
addMacros(CppModelManager::configurationFileName(), context.snapshot());
addMacros(context.thisDocument()->fileName(), context.snapshot());
addSnippets();
return !m_completions.isEmpty();
}
bool InternalCppCompletionAssistProcessor::completeMember(const QList<LookupItem> &baseResults)
@@ -1659,19 +1834,8 @@ bool InternalCppCompletionAssistProcessor::completeQtMethod(const QList<LookupIt
o.showFunctionSignatures = true;
QSet<QString> signatures;
foreach (const LookupItem &p, results) {
FullySpecifiedType ty = p.type().simplified();
if (PointerType *ptrTy = ty->asPointerType())
ty = ptrTy->elementType().simplified();
else
continue; // not a pointer or a reference to a pointer.
NamedType *namedTy = ty->asNamedType();
if (!namedTy) // not a class name.
continue;
ClassOrNamespace *b = context.lookupType(namedTy->name(), p.scope());
foreach (const LookupItem &lookupItem, results) {
ClassOrNamespace *b = classOrNamespaceFromLookupItem(lookupItem, context);
if (!b)
continue;
@@ -1712,7 +1876,7 @@ bool InternalCppCompletionAssistProcessor::completeQtMethod(const QList<LookupIt
unsigned count = fun->argumentCount();
while (true) {
const QString completionText = wantQt5SignalOrSlot
? createQt5SignalOrSlot(fun, klass)
? createQt5SignalOrSlot(fun, o)
: createQt4SignalOrSlot(fun, o);
if (!signatures.contains(completionText)) {
@@ -1736,6 +1900,34 @@ bool InternalCppCompletionAssistProcessor::completeQtMethod(const QList<LookupIt
return !m_completions.isEmpty();
}
bool InternalCppCompletionAssistProcessor::completeQtMethodClassName(
const QList<LookupItem> &results, Scope *cursorScope)
{
QTC_ASSERT(cursorScope, return false);
if (results.isEmpty())
return false;
const LookupContext &context = m_model->m_typeOfExpression->context();
Overview overview;
foreach (const LookupItem &lookupItem, results) {
Class *klass = classFromLookupItem(lookupItem, context);
QTC_ASSERT(klass, continue);
const Name *name = minimalName(klass, cursorScope, context);
QTC_ASSERT(name, continue);
AssistProposalItem *item = new CppAssistProposalItem;
item->setText(overview.prettyName(name));
item->setDetail(overview.prettyType(klass->type(), klass->name()));
item->setData(QVariant::fromValue(static_cast<Symbol *>(klass)));
m_completions.append(item);
break;
}
return !m_completions.isEmpty();
}
void InternalCppCompletionAssistProcessor::addKeywords()
{
int keywordLimit = T_FIRST_OBJC_AT_KEYWORD;