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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 "ContextFinder.h"
#include "RefactoringActions.h"
#include "swift/AST/DiagnosticsRefactoring.h"
#include "swift/AST/Pattern.h"
#include "swift/AST/Stmt.h"
using namespace swift::refactoring;
static EnumDecl *getEnumDeclFromSwitchStmt(SwitchStmt *SwitchS) {
if (auto SubjectTy = SwitchS->getSubjectExpr()->getType()) {
// FIXME: Support more complex subject like '(Enum1, Enum2)'.
return dyn_cast_or_null<EnumDecl>(SubjectTy->getAnyNominal());
}
return nullptr;
}
static bool performCasesExpansionInSwitchStmt(SwitchStmt *SwitchS,
DiagnosticEngine &DiagEngine,
SourceLoc ExpandedStmtLoc,
EditorConsumerInsertStream &OS) {
// Assume enum elements are not handled in the switch statement.
auto EnumDecl = getEnumDeclFromSwitchStmt(SwitchS);
assert(EnumDecl);
llvm::DenseSet<EnumElementDecl *> UnhandledElements;
EnumDecl->getAllElements(UnhandledElements);
for (auto Current : SwitchS->getCases()) {
if (Current->isDefault()) {
continue;
}
// For each handled enum element, remove it from the bucket.
for (auto Item : Current->getCaseLabelItems()) {
if (auto *EEP = dyn_cast_or_null<EnumElementPattern>(Item.getPattern())) {
UnhandledElements.erase(EEP->getElementDecl());
}
}
}
// If all enum elements are handled in the switch statement, issue error.
if (UnhandledElements.empty()) {
DiagEngine.diagnose(ExpandedStmtLoc, diag::no_remaining_cases);
return true;
}
printEnumElementsAsCases(UnhandledElements, OS);
return false;
}
// Finds SwitchStmt that contains given CaseStmt.
static SwitchStmt *findEnclosingSwitchStmt(CaseStmt *CS, SourceFile *SF,
DiagnosticEngine &DiagEngine) {
auto IsSwitch = [](ASTNode Node) {
return Node.is<Stmt *>() &&
Node.get<Stmt *>()->getKind() == StmtKind::Switch;
};
ContextFinder Finder(*SF, CS, IsSwitch);
Finder.resolve();
// If failed to find the switch statement, issue error.
if (Finder.getContexts().empty()) {
DiagEngine.diagnose(CS->getStartLoc(), diag::no_parent_switch);
return nullptr;
}
auto *SwitchS =
static_cast<SwitchStmt *>(Finder.getContexts().back().get<Stmt *>());
// Make sure that CaseStmt is included in switch that was found.
auto Cases = SwitchS->getCases();
auto Default = std::find(Cases.begin(), Cases.end(), CS);
if (Default == Cases.end()) {
DiagEngine.diagnose(CS->getStartLoc(), diag::no_parent_switch);
return nullptr;
}
return SwitchS;
}
bool RefactoringActionExpandDefault::isApplicable(
ResolvedCursorInfoPtr CursorInfo, DiagnosticEngine &Diag) {
auto Exit = [&](bool Applicable) {
if (!Applicable)
Diag.diagnose(SourceLoc(), diag::invalid_default_location);
return Applicable;
};
auto StmtStartInfo = dyn_cast<ResolvedStmtStartCursorInfo>(CursorInfo);
if (!StmtStartInfo)
return Exit(false);
if (auto *CS = dyn_cast<CaseStmt>(StmtStartInfo->getTrailingStmt())) {
auto EnclosingSwitchStmt =
findEnclosingSwitchStmt(CS, CursorInfo->getSourceFile(), Diag);
if (!EnclosingSwitchStmt)
return false;
auto EnumD = getEnumDeclFromSwitchStmt(EnclosingSwitchStmt);
auto IsApplicable = CS->isDefault() && EnumD != nullptr;
return IsApplicable;
}
return Exit(false);
}
bool RefactoringActionExpandDefault::performChange() {
// If we've not seen the default statement inside the switch statement, issue
// error.
auto StmtStartInfo = cast<ResolvedStmtStartCursorInfo>(CursorInfo);
auto *CS = static_cast<CaseStmt *>(StmtStartInfo->getTrailingStmt());
auto *SwitchS = findEnclosingSwitchStmt(CS, TheFile, DiagEngine);
assert(SwitchS);
EditorConsumerInsertStream OS(
EditConsumer, SM,
Lexer::getCharSourceRangeFromSourceRange(SM, CS->getLabelItemsRange()));
return performCasesExpansionInSwitchStmt(SwitchS, DiagEngine,
CS->getStartLoc(), OS);
}
bool RefactoringActionExpandSwitchCases::isApplicable(
ResolvedCursorInfoPtr CursorInfo, DiagnosticEngine &DiagEngine) {
auto StmtStartInfo = dyn_cast<ResolvedStmtStartCursorInfo>(CursorInfo);
if (!StmtStartInfo || !StmtStartInfo->getTrailingStmt())
return false;
if (auto *Switch = dyn_cast<SwitchStmt>(StmtStartInfo->getTrailingStmt())) {
return getEnumDeclFromSwitchStmt(Switch);
}
return false;
}
bool RefactoringActionExpandSwitchCases::performChange() {
auto StmtStartInfo = cast<ResolvedStmtStartCursorInfo>(CursorInfo);
auto *SwitchS = dyn_cast<SwitchStmt>(StmtStartInfo->getTrailingStmt());
assert(SwitchS);
auto InsertRange = CharSourceRange();
auto Cases = SwitchS->getCases();
auto Default = std::find_if(Cases.begin(), Cases.end(),
[](CaseStmt *Stmt) { return Stmt->isDefault(); });
if (Default != Cases.end()) {
auto DefaultRange = (*Default)->getLabelItemsRange();
InsertRange = Lexer::getCharSourceRangeFromSourceRange(SM, DefaultRange);
} else {
auto RBraceLoc = SwitchS->getRBraceLoc();
InsertRange = CharSourceRange(SM, RBraceLoc, RBraceLoc);
}
EditorConsumerInsertStream OS(EditConsumer, SM, InsertRange);
if (SM.getLineAndColumnInBuffer(SwitchS->getLBraceLoc()).first ==
SM.getLineAndColumnInBuffer(SwitchS->getRBraceLoc()).first) {
OS << "\n";
}
auto Result = performCasesExpansionInSwitchStmt(SwitchS, DiagEngine,
SwitchS->getStartLoc(), OS);
return Result;
}
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