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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "RefactoringActions.h"
#include "swift/AST/TypeRepr.h"
using namespace swift::refactoring;
bool RefactoringActionConvertToComputedProperty::isApplicable(
const ResolvedRangeInfo &Info, DiagnosticEngine &Diag) {
if (Info.Kind != RangeKind::SingleDecl) {
return false;
}
if (Info.ContainedNodes.size() != 1) {
return false;
}
auto D = Info.ContainedNodes[0].dyn_cast<Decl *>();
if (!D) {
return false;
}
auto Binding = dyn_cast<PatternBindingDecl>(D);
if (!Binding) {
return false;
}
auto SV = Binding->getSingleVar();
if (!SV) {
return false;
}
// willSet, didSet cannot be provided together with a getter
for (auto AD : SV->getAllAccessors()) {
if (AD->isObservingAccessor()) {
return false;
}
}
// 'lazy' must not be used on a computed property
// NSCopying and IBOutlet attribute requires property to be mutable
auto Attributies = SV->getAttrs();
if (Attributies.hasAttribute<LazyAttr>() ||
Attributies.hasAttribute<NSCopyingAttr>() ||
Attributies.hasAttribute<IBOutletAttr>()) {
return false;
}
// Property wrapper cannot be applied to a computed property
if (SV->hasAttachedPropertyWrapper()) {
return false;
}
// has an initializer
return Binding->hasInitStringRepresentation(0);
}
bool RefactoringActionConvertToComputedProperty::performChange() {
// Get an initialization
auto D = RangeInfo.ContainedNodes[0].dyn_cast<Decl *>();
auto Binding = dyn_cast<PatternBindingDecl>(D);
SmallString<128> scratch;
auto Init = Binding->getInitStringRepresentation(0, scratch);
// Get type
auto SV = Binding->getSingleVar();
auto SVType = SV->getTypeInContext();
auto TR = SV->getTypeReprOrParentPatternTypeRepr();
SmallString<64> DeclBuffer;
llvm::raw_svector_ostream OS(DeclBuffer);
StringRef Space = " ";
StringRef NewLine = "\n";
OS << tok::kw_var << Space;
// Add var name
OS << SV->getNameStr().str() << ":" << Space;
// For computed property must write a type of var
if (TR) {
OS << Lexer::getCharSourceRangeFromSourceRange(SM, TR->getSourceRange())
.str();
} else {
SVType.print(OS);
}
OS << Space << tok::l_brace << NewLine;
// Add an initialization
OS << tok::kw_return << Space << Init.str() << NewLine;
OS << tok::r_brace;
// Replace initializer to computed property
auto ReplaceStartLoc = Binding->getLoc();
auto ReplaceEndLoc = Binding->getSourceRange().End;
auto ReplaceRange = SourceRange(ReplaceStartLoc, ReplaceEndLoc);
auto ReplaceCharSourceRange =
Lexer::getCharSourceRangeFromSourceRange(SM, ReplaceRange);
EditConsumer.accept(SM, ReplaceCharSourceRange, DeclBuffer.str());
return false; // success
}
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