| 1 | //===--- AvoidNestedConditionalOperatorCheck.cpp - clang-tidy -------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #include "AvoidNestedConditionalOperatorCheck.h" |
| 10 | #include "clang/ASTMatchers/ASTMatchFinder.h" |
| 11 | #include "clang/ASTMatchers/ASTMatchers.h" |
| 12 | #include "clang/Basic/DiagnosticIDs.h" |
| 13 | |
| 14 | using namespace clang::ast_matchers; |
| 15 | |
| 16 | namespace clang::tidy::readability { |
| 17 | |
| 18 | void AvoidNestedConditionalOperatorCheck::registerMatchers( |
| 19 | MatchFinder *Finder) { |
| 20 | Finder->addMatcher( |
| 21 | NodeMatch: conditionalOperator( |
| 22 | anyOf( |
| 23 | hasCondition(InnerMatcher: ignoringParenCasts( |
| 24 | InnerMatcher: conditionalOperator().bind(ID: "nested-conditional-operator"))), |
| 25 | hasTrueExpression(InnerMatcher: ignoringParenCasts( |
| 26 | InnerMatcher: conditionalOperator().bind(ID: "nested-conditional-operator"))), |
| 27 | hasFalseExpression(InnerMatcher: ignoringParenCasts( |
| 28 | InnerMatcher: conditionalOperator().bind(ID: "nested-conditional-operator"))))) |
| 29 | .bind(ID: "conditional-operator"), |
| 30 | Action: this); |
| 31 | } |
| 32 | |
| 33 | void AvoidNestedConditionalOperatorCheck::check( |
| 34 | const MatchFinder::MatchResult &Result) { |
| 35 | const auto *CO = |
| 36 | Result.Nodes.getNodeAs<ConditionalOperator>(ID: "conditional-operator"); |
| 37 | const auto *NCO = Result.Nodes.getNodeAs<ConditionalOperator>( |
| 38 | ID: "nested-conditional-operator"); |
| 39 | assert(CO); |
| 40 | assert(NCO); |
| 41 | |
| 42 | if (CO->getBeginLoc().isMacroID() || NCO->getBeginLoc().isMacroID()) |
| 43 | return; |
| 44 | |
| 45 | diag(Loc: NCO->getBeginLoc(), |
| 46 | Description: "conditional operator is used as sub-expression of parent conditional " |
| 47 | "operator, refrain from using nested conditional operators"); |
| 48 | diag(Loc: CO->getBeginLoc(), Description: "parent conditional operator here", |
| 49 | Level: DiagnosticIDs::Note); |
| 50 | } |
| 51 | |
| 52 | } // namespace clang::tidy::readability |
| 53 |