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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#ifndef LO_CLANG_SHARED_PLUGINS
#include <cassert>
#include <string>
#include <iostream>
#include <fstream>
#include <set>
#include "plugin.hxx"
/**
Check for places where we do
if (xxx) ;
or
if (xxx) {}
*/
namespace
{
class EmptyIf : public loplugin::FilteringRewritePlugin<EmptyIf>
{
public:
explicit EmptyIf(loplugin::InstantiationData const& data)
: FilteringRewritePlugin(data)
{
}
virtual void run() override { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
bool VisitIfStmt(IfStmt const*);
private:
bool ContainsComment(Stmt const*);
};
static bool empty(Stmt const* stmt)
{
if (isa<NullStmt>(stmt))
return true;
auto compoundStmt = dyn_cast<CompoundStmt>(stmt);
if (!compoundStmt)
return false;
return compoundStmt->size() == 0;
}
bool EmptyIf::ContainsComment(Stmt const* stmt)
{
auto range = stmt->getSourceRange();
SourceManager& SM = compiler.getSourceManager();
SourceLocation startLoc = range.getBegin();
SourceLocation endLoc = range.getEnd();
char const* p1 = SM.getCharacterData(startLoc);
char const* p2 = SM.getCharacterData(endLoc);
p2 += Lexer::MeasureTokenLength(endLoc, SM, compiler.getLangOpts());
auto s = llvm::StringRef(p1, p2 - p1);
return s.find("//") != llvm::StringRef::npos || s.find("/*") != llvm::StringRef::npos
|| s.find("#if") != llvm::StringRef::npos;
}
bool EmptyIf::VisitIfStmt(IfStmt const* ifStmt)
{
if (ignoreLocation(ifStmt))
return true;
if (ifStmt->getElse() && empty(ifStmt->getElse()) && !ContainsComment(ifStmt->getElse()))
{
report(DiagnosticsEngine::Warning, "empty else body", ifStmt->getElse()->getBeginLoc())
<< ifStmt->getElse()->getSourceRange();
return true;
}
if (!ifStmt->getElse() && empty(ifStmt->getThen()) && !ContainsComment(ifStmt->getThen()))
{
report(DiagnosticsEngine::Warning, "empty if body", ifStmt->getBeginLoc())
<< ifStmt->getSourceRange();
}
return true;
}
loplugin::Plugin::Registration<EmptyIf> emptyif("emptyif", true);
}
#endif // LO_CLANG_SHARED_PLUGINS
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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