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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.
*
* Based on LLVM/Clang.
*
* This file is distributed under the University of Illinois Open Source
* License. See LICENSE.TXT for details.
*
*/
#include "cascadingcondop.hxx"
/*
This is a compile check.
It checks for complex statements with conditional operators in conditional
operators, which are error prone, e.g.
Thing foo = IsBar() ? ( IsBaz() ? b1 : b2 ) : b3;
However, it finds 556 cases in sw/source alone, thus likely needs some more
restricting, e.g. by checking for multiline conditional operator statements or
a certain length in characters (but that needs the Context/SourceManager, which
I haven't played with yet).
*/
// the value is rather arbitrary, but code above this number of stmts begins to
// be smelly
static const int stmtlimit = 50;
namespace loplugin
{
struct WalkCounter
{
int stmtcount;
bool cascading;
};
// Ctor, nothing special, pass the argument(s).
CascadingCondOp::CascadingCondOp(const InstantiationData& data)
: FilteringPlugin(data)
{
}
// Perform the actual action.
void CascadingCondOp::run()
{
// Traverse the whole AST of the translation unit (i.e. examine the whole source file).
// The Clang AST helper class will call VisitReturnStmt for every return statement.
TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
}
void CascadingCondOp::Walk(const Stmt* stmt, WalkCounter& c)
{
for (Stmt::const_child_iterator it = stmt->child_begin(); it != stmt->child_end(); ++it)
{
++c.stmtcount;
if (dyn_cast<ConditionalOperator>(*it))
c.cascading = true;
Walk(*it, c);
}
}
bool CascadingCondOp::VisitStmt(const Stmt* stmt)
{
if (const ConditionalOperator* condop = dyn_cast<ConditionalOperator>(stmt))
{
WalkCounter c = { 0, false };
Walk(condop, c);
if (c.cascading && c.stmtcount >= stmtlimit)
{
std::string msg("cascading conditional operator, complexity: ");
msg.append(std::to_string(c.stmtcount));
report(DiagnosticsEngine::Warning, msg, condop->getLocStart());
}
}
return true;
}
// Register the plugin action with the LO plugin handling.
static Plugin::Registration<CascadingCondOp> X("cascadingcondop");
} // namespace loplugin
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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