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//===--- RefactoringActionRules.h - Clang refactoring library -------------===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "clang/Tooling/Refactoring/RefactoringActionRule.h"
#include "clang/Tooling/Refactoring/RefactoringActionRulesInternal.h"
namespace clang {
namespace tooling {
/// Creates a new refactoring action rule that constructs and invokes the
/// \c RuleType rule when all of the requirements are satisfied.
/// This function takes in a list of values whose type derives from
/// \c RefactoringActionRuleRequirement. These values describe the initiation
/// requirements that have to be satisfied by the refactoring engine before
/// the provided action rule can be constructed and invoked. The engine
/// verifies that the requirements are satisfied by evaluating them (using the
/// 'evaluate' member function) and checking that the results don't contain
/// any errors. Once all requirements are satisfied, the provided refactoring
/// rule is constructed by passing in the values returned by the requirements'
/// evaluate functions as arguments to the constructor. The rule is then invoked
/// immediately after construction.
/// The separation of requirements, their evaluation and the invocation of the
/// refactoring action rule allows the refactoring clients to:
/// - Disable refactoring action rules whose requirements are not supported.
/// - Gather the set of options and define a command-line / visual interface
/// that allows users to input these options without ever invoking the
/// action.
template <typename RuleType, typename... RequirementTypes>
createRefactoringActionRule(const RequirementTypes &... Requirements);
/// A set of refactoring action rules that should have unique initiation
/// requirements.
using RefactoringActionRules =
/// A type of refactoring action rule that produces source replacements in the
/// form of atomic changes.
/// This action rule is typically used for local refactorings that replace
/// source in a single AST unit.
class SourceChangeRefactoringRule : public RefactoringActionRuleBase {
void invoke(RefactoringResultConsumer &Consumer,
RefactoringRuleContext &Context) final override {
Expected<AtomicChanges> Changes = createSourceReplacements(Context);
if (!Changes)
virtual Expected<AtomicChanges>
createSourceReplacements(RefactoringRuleContext &Context) = 0;
/// A type of refactoring action rule that finds a set of symbol occurrences
/// that reference a particular symbol.
/// This action rule is typically used for an interactive rename that allows
/// users to specify the new name and the set of selected occurrences during
/// the refactoring.
class FindSymbolOccurrencesRefactoringRule : public RefactoringActionRuleBase {
void invoke(RefactoringResultConsumer &Consumer,
RefactoringRuleContext &Context) final override {
Expected<SymbolOccurrences> Occurrences = findSymbolOccurrences(Context);
if (!Occurrences)
virtual Expected<SymbolOccurrences>
findSymbolOccurrences(RefactoringRuleContext &Context) = 0;
} // end namespace tooling
} // end namespace clang