forked from OSchip/llvm-project
115 lines
4.6 KiB
C++
115 lines
4.6 KiB
C++
//===--- SimplifyBooleanExpr.h clang-tidy -----------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_READABILITY_SIMPLIFY_BOOLEAN_EXPR_H
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#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_READABILITY_SIMPLIFY_BOOLEAN_EXPR_H
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#include "../ClangTidy.h"
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namespace clang {
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namespace tidy {
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namespace readability {
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/// \brief Looks for boolean expressions involving boolean constants and
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// simplifies them to use the appropriate boolean expression directly.
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///
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/// Examples:
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/// `if (b == true)` becomes `if (b)`
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/// `if (b == false)` becomes `if (!b)`
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/// `if (b && true)` becomes `if (b)`
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/// `if (b && false)` becomes `if (false)`
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/// `if (b || true)` becomes `if (true)`
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/// `if (b || false)` becomes `if (b)`
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/// `e ? true : false` becomes `e`
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/// `e ? false : true` becomes `!e`
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/// `if (true) t(); else f();` becomes `t();`
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/// `if (false) t(); else f();` becomes `f();`
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/// `if (e) return true; else return false;` becomes `return e;`
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/// `if (e) return false; else return true;` becomes `return !e;`
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/// `if (e) b = true; else b = false;` becomes `b = e;`
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/// `if (e) b = false; else b = true;` becomes `b = !e;`
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///
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/// Parenthesis from the resulting expression `e` are removed whenever
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/// possible.
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///
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/// When a conditional boolean return or assignment appears at the end of a
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/// chain of `if`, `else if` statements, the conditional statement is left
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/// unchanged unless the option `ChainedConditionalReturn` or
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/// `ChainedConditionalAssignment`, respectively, is specified as non-zero.
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/// The default value for both options is zero.
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///
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class SimplifyBooleanExprCheck : public ClangTidyCheck {
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public:
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SimplifyBooleanExprCheck(StringRef Name, ClangTidyContext *Context);
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void storeOptions(ClangTidyOptions::OptionMap &Options) override;
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void registerMatchers(ast_matchers::MatchFinder *Finder) override;
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void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
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private:
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void matchBoolBinOpExpr(ast_matchers::MatchFinder *Finder, bool Value,
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StringRef OperatorName, StringRef BooleanId);
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void matchExprBinOpBool(ast_matchers::MatchFinder *Finder, bool Value,
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StringRef OperatorName, StringRef BooleanId);
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void matchBoolCompOpExpr(ast_matchers::MatchFinder *Finder, bool Value,
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StringRef OperatorName, StringRef BooleanId);
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void matchExprCompOpBool(ast_matchers::MatchFinder *Finder, bool Value,
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StringRef OperatorName, StringRef BooleanId);
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void matchBoolCondition(ast_matchers::MatchFinder *Finder, bool Value,
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StringRef BooleanId);
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void matchTernaryResult(ast_matchers::MatchFinder *Finder, bool Value,
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StringRef TernaryId);
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void matchIfReturnsBool(ast_matchers::MatchFinder *Finder, bool Value,
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StringRef Id);
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void matchIfAssignsBool(ast_matchers::MatchFinder *Finder, bool Value,
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StringRef Id);
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void
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replaceWithExpression(const ast_matchers::MatchFinder::MatchResult &Result,
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const CXXBoolLiteralExpr *BoolLiteral, bool UseLHS,
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bool Negated = false);
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void
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replaceWithThenStatement(const ast_matchers::MatchFinder::MatchResult &Result,
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const CXXBoolLiteralExpr *BoolLiteral);
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void
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replaceWithElseStatement(const ast_matchers::MatchFinder::MatchResult &Result,
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const CXXBoolLiteralExpr *FalseConditionRemoved);
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void
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replaceWithCondition(const ast_matchers::MatchFinder::MatchResult &Result,
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const ConditionalOperator *Ternary,
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bool Negated = false);
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void replaceWithReturnCondition(
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const ast_matchers::MatchFinder::MatchResult &Result, const IfStmt *If,
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bool Negated = false);
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void
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replaceWithAssignment(const ast_matchers::MatchFinder::MatchResult &Result,
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const IfStmt *If, bool Negated = false);
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const bool ChainedConditionalReturn;
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const bool ChainedConditionalAssignment;
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};
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} // namespace readability
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} // namespace tidy
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} // namespace clang
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#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_READABILITY_SIMPLIFY_BOOLEAN_EXPR_H
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