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/**************************************************************************
**
** 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 qt-info@nokia.com.
**
**************************************************************************/
#include "cppcompleteswitch.h"
#include <cplusplus/Overview.h>
#include <cplusplus/TypeOfExpression.h>
#include <cpptools/cpprefactoringchanges.h>
#include <utils/changeset.h>
#include <AST.h>
#include <ASTVisitor.h>
#include <CoreTypes.h>
#include <Symbols.h>
#include <QtGui/QApplication>
using namespace CPlusPlus;
using namespace CppEditor;
using namespace CppEditor::Internal;
using namespace CppTools;
using namespace Utils;
namespace {
class CaseStatementCollector : public ASTVisitor
{
public:
CaseStatementCollector(Document::Ptr document, const Snapshot &snapshot,
Scope *scope)
: ASTVisitor(document->translationUnit()),
document(document),
scope(scope)
{
typeOfExpression.init(document, snapshot);
}
QStringList operator ()(AST *ast)
{
values.clear();
foundCaseStatementLevel = false;
accept(ast);
return values;
}
bool preVisit(AST *ast) {
if (CaseStatementAST *cs = ast->asCaseStatement()) {
foundCaseStatementLevel = true;
if (ExpressionAST *expression = cs->expression->asIdExpression()) {
QList<LookupItem> candidates = typeOfExpression(expression,
document,
scope);
if (!candidates .isEmpty() && candidates.first().declaration()) {
Symbol *decl = candidates.first().declaration();
values << prettyPrint(LookupContext::fullyQualifiedName(decl));
}
}
return true;
} else if (foundCaseStatementLevel) {
return false;
}
return true;
}
Overview prettyPrint;
bool foundCaseStatementLevel;
QStringList values;
TypeOfExpression typeOfExpression;
Document::Ptr document;
Scope *scope;
};
class Operation: public CppQuickFixOperation
{
public:
Operation(const CppQuickFixState &state, int priority, CompoundStatementAST *compoundStatement, const QStringList &values)
: CppQuickFixOperation(state, priority)
, compoundStatement(compoundStatement)
, values(values)
{
setDescription(QApplication::translate("CppTools::QuickFix",
"Complete Switch Statement"));
}
virtual void performChanges(CppRefactoringFile *currentFile, CppRefactoringChanges *)
{
ChangeSet changes;
int start = currentFile->endOf(compoundStatement->lbrace_token);
changes.insert(start, QLatin1String("\ncase ")
+ values.join(QLatin1String(":\nbreak;\ncase "))
+ QLatin1String(":\nbreak;"));
currentFile->change(changes);
currentFile->indent(currentFile->range(compoundStatement));
}
CompoundStatementAST *compoundStatement;
QStringList values;
};
static Enum *findEnum(const QList<LookupItem> &results,
const LookupContext &ctxt)
{
foreach (const LookupItem &result, results) {
const FullySpecifiedType fst = result.type();
Type *type = result.declaration() ? result.declaration()->type().type()
: fst.type();
if (!type)
continue;
if (Enum *e = type->asEnumType())
return e;
if (const NamedType *namedType = type->asNamedType()) {
const QList<LookupItem> candidates =
ctxt.lookup(namedType->name(), result.scope());
return findEnum(candidates, ctxt);
}
}
return 0;
}
static Enum *conditionEnum(const CppQuickFixState &state,
SwitchStatementAST *statement)
{
Block *block = statement->symbol;
Scope *scope = state.document()->scopeAt(block->line(), block->column());
TypeOfExpression typeOfExpression;
typeOfExpression.init(state.document(), state.snapshot());
const QList<LookupItem> results = typeOfExpression(statement->condition,
state.document(),
scope);
return findEnum(results, typeOfExpression.context());
}
} // end of anonymous namespace
QList<CppQuickFixOperation::Ptr> CompleteSwitchCaseStatement::match(const CppQuickFixState &state)
{
const QList<AST *> &path = state.path();
if (path.isEmpty())
return noResult(); // nothing to do
// look for switch statement
for (int depth = path.size() - 1; depth >= 0; --depth) {
AST *ast = path.at(depth);
SwitchStatementAST *switchStatement = ast->asSwitchStatement();
if (switchStatement) {
if (!state.isCursorOn(switchStatement->switch_token) || !switchStatement->statement)
return noResult();
CompoundStatementAST *compoundStatement = switchStatement->statement->asCompoundStatement();
if (!compoundStatement) // we ignore pathologic case "switch (t) case A: ;"
return noResult();
// look if the condition's type is an enum
if (Enum *e = conditionEnum(state, switchStatement)) {
// check the possible enum values
QStringList values;
Overview prettyPrint;
for (unsigned i = 0; i < e->memberCount(); ++i) {
if (Declaration *decl = e->memberAt(i)->asDeclaration()) {
values << prettyPrint(LookupContext::fullyQualifiedName(decl));
}
}
// Get the used values
Block *block = switchStatement->symbol;
CaseStatementCollector caseValues(state.document(), state.snapshot(),
state.document()->scopeAt(block->line(), block->column()));
QStringList usedValues = caseValues(switchStatement);
// save the values that would be added
foreach (const QString &usedValue, usedValues)
values.removeAll(usedValue);
if (values.isEmpty())
return noResult();
else
return singleResult(new Operation(state, depth, compoundStatement, values));
}
return noResult();
}
}
return noResult();
}
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