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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/Stmt.h"
using namespace swift::refactoring;
/// Struct containing info about an IfStmt that can be converted into a
/// TernaryExpr.
struct ConvertToTernaryExprInfo {
ConvertToTernaryExprInfo() {}
Expr *AssignDest() {
if (!Then || !Then->getDest() || !Else || !Else->getDest())
return nullptr;
auto ThenDest = Then->getDest();
auto ElseDest = Else->getDest();
if (ThenDest->getKind() != ElseDest->getKind())
return nullptr;
switch (ThenDest->getKind()) {
case ExprKind::DeclRef: {
auto ThenRef = dyn_cast<DeclRefExpr>(Then->getDest());
auto ElseRef = dyn_cast<DeclRefExpr>(Else->getDest());
if (!ThenRef || !ThenRef->getDecl() || !ElseRef || !ElseRef->getDecl())
return nullptr;
const auto ThenName = ThenRef->getDecl()->getName();
const auto ElseName = ElseRef->getDecl()->getName();
if (ThenName.compare(ElseName) != 0)
return nullptr;
return Then->getDest();
}
case ExprKind::Tuple: {
auto ThenTuple = dyn_cast<TupleExpr>(Then->getDest());
auto ElseTuple = dyn_cast<TupleExpr>(Else->getDest());
if (!ThenTuple || !ElseTuple)
return nullptr;
auto ThenNames = ThenTuple->getElementNames();
auto ElseNames = ElseTuple->getElementNames();
if (!ThenNames.equals(ElseNames))
return nullptr;
return ThenTuple;
}
default:
return nullptr;
}
}
Expr *ThenSrc() {
if (!Then)
return nullptr;
return Then->getSrc();
}
Expr *ElseSrc() {
if (!Else)
return nullptr;
return Else->getSrc();
}
bool isValid() {
if (!Cond || !AssignDest() || !ThenSrc() || !ElseSrc() ||
!IfRange.isValid())
return false;
return true;
}
PatternBindingDecl *Binding = nullptr; // optional
Expr *Cond = nullptr; // required
AssignExpr *Then = nullptr; // required
AssignExpr *Else = nullptr; // required
SourceRange IfRange;
};
ConvertToTernaryExprInfo
findConvertToTernaryExpression(const ResolvedRangeInfo &Info) {
auto notFound = ConvertToTernaryExprInfo();
if (Info.Kind != RangeKind::SingleStatement &&
Info.Kind != RangeKind::MultiStatement)
return notFound;
if (Info.ContainedNodes.empty())
return notFound;
struct AssignExprFinder : public SourceEntityWalker {
AssignExpr *Assign = nullptr;
AssignExprFinder(Stmt *S) {
if (S)
walk(S);
}
virtual bool walkToExprPre(Expr *E) override {
Assign = dyn_cast<AssignExpr>(E);
return false;
}
};
ConvertToTernaryExprInfo Target;
IfStmt *If = nullptr;
if (Info.ContainedNodes.size() == 1) {
if (auto S = Info.ContainedNodes[0].dyn_cast<Stmt *>())
If = dyn_cast<IfStmt>(S);
}
if (Info.ContainedNodes.size() == 2) {
if (auto D = Info.ContainedNodes[0].dyn_cast<Decl *>())
Target.Binding = dyn_cast<PatternBindingDecl>(D);
if (auto S = Info.ContainedNodes[1].dyn_cast<Stmt *>())
If = dyn_cast<IfStmt>(S);
}
if (!If)
return notFound;
auto CondList = If->getCond();
if (CondList.size() != 1)
return notFound;
Target.Cond = CondList[0].getBooleanOrNull();
Target.IfRange = If->getSourceRange();
Target.Then = AssignExprFinder(If->getThenStmt()).Assign;
Target.Else = AssignExprFinder(If->getElseStmt()).Assign;
return Target;
}
bool RefactoringActionConvertToTernaryExpr::isApplicable(
const ResolvedRangeInfo &Info, DiagnosticEngine &Diag) {
return findConvertToTernaryExpression(Info).isValid();
}
bool RefactoringActionConvertToTernaryExpr::performChange() {
auto Target = findConvertToTernaryExpression(RangeInfo);
if (!Target.isValid())
return true; // abort
SmallString<64> DeclBuffer;
llvm::raw_svector_ostream OS(DeclBuffer);
StringRef Space = " ";
auto IfRange = Target.IfRange;
auto ReplaceRange = Lexer::getCharSourceRangeFromSourceRange(SM, IfRange);
auto CondRange = Target.Cond->getSourceRange();
auto CondCharRange = Lexer::getCharSourceRangeFromSourceRange(SM, CondRange);
auto ThenRange = Target.ThenSrc()->getSourceRange();
auto ThenCharRange = Lexer::getCharSourceRangeFromSourceRange(SM, ThenRange);
auto ElseRange = Target.ElseSrc()->getSourceRange();
auto ElseCharRange = Lexer::getCharSourceRangeFromSourceRange(SM, ElseRange);
CharSourceRange DestCharRange;
if (Target.Binding) {
auto DestRange = Target.Binding->getSourceRange();
DestCharRange = Lexer::getCharSourceRangeFromSourceRange(SM, DestRange);
ReplaceRange.widen(DestCharRange);
} else {
auto DestRange = Target.AssignDest()->getSourceRange();
DestCharRange = Lexer::getCharSourceRangeFromSourceRange(SM, DestRange);
}
OS << DestCharRange.str() << Space << tok::equal << Space;
OS << CondCharRange.str() << Space << tok::question_postfix << Space;
OS << ThenCharRange.str() << Space << tok::colon << Space;
OS << ElseCharRange.str();
EditConsumer.accept(SM, ReplaceRange, DeclBuffer.str());
return false; // don't abort
}
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