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//===--- UseBoolLiteralsCheck.cpp - clang-tidy-----------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "UseBoolLiteralsCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Lex/Lexer.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace modernize {
UseBoolLiteralsCheck::UseBoolLiteralsCheck(StringRef Name,
ClangTidyContext *Context)
: ClangTidyCheck(Name, Context),
IgnoreMacros(Options.getLocalOrGlobal("IgnoreMacros", true)) {}
void UseBoolLiteralsCheck::registerMatchers(MatchFinder *Finder) {
if (!getLangOpts().CPlusPlus)
return;
Finder->addMatcher(
implicitCastExpr(
has(ignoringParenImpCasts(integerLiteral().bind("literal"))),
hasImplicitDestinationType(qualType(booleanType())),
unless(isInTemplateInstantiation()),
anyOf(hasParent(explicitCastExpr().bind("cast")), anything())),
this);
Finder->addMatcher(
conditionalOperator(
hasParent(implicitCastExpr(
hasImplicitDestinationType(qualType(booleanType())),
unless(isInTemplateInstantiation()))),
eachOf(hasTrueExpression(
ignoringParenImpCasts(integerLiteral().bind("literal"))),
hasFalseExpression(
ignoringParenImpCasts(integerLiteral().bind("literal"))))),
this);
}
void UseBoolLiteralsCheck::check(const MatchFinder::MatchResult &Result) {
const auto *Literal = Result.Nodes.getNodeAs<IntegerLiteral>("literal");
const auto *Cast = Result.Nodes.getNodeAs<Expr>("cast");
bool LiteralBooleanValue = Literal->getValue().getBoolValue();
if (Literal->isInstantiationDependent())
return;
const Expr *Expression = Cast ? Cast : Literal;
bool InMacro = Expression->getBeginLoc().isMacroID();
if (InMacro && IgnoreMacros)
return;
auto Diag =
diag(Expression->getExprLoc(),
"converting integer literal to bool, use bool literal instead");
if (!InMacro)
Diag << FixItHint::CreateReplacement(
Expression->getSourceRange(), LiteralBooleanValue ? "true" : "false");
}
} // namespace modernize
} // namespace tidy
} // namespace clang
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