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//===--- DerivedConformanceError.cpp - Derived Error ----------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 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
//
//===----------------------------------------------------------------------===//
//
// This file implements implicit derivation of the Error
// protocol.
//
//===----------------------------------------------------------------------===//
#include "CodeSynthesis.h"
#include "TypeChecker.h"
#include "DerivedConformances.h"
#include "swift/AST/Decl.h"
#include "swift/AST/Stmt.h"
#include "swift/AST/Expr.h"
#include "swift/AST/Module.h"
#include "swift/AST/Types.h"
#include "swift/AST/SwiftNameTranslation.h"
using namespace swift;
using namespace swift::objc_translation;
static std::pair<BraceStmt *, bool>
deriveBodyBridgedNSError_enum_nsErrorDomain(AbstractFunctionDecl *domainDecl,
void *) {
// enum SomeEnum {
// @derived
// static var _nsErrorDomain: String {
// return String(reflecting: self)
// }
// }
auto M = domainDecl->getParentModule();
auto &C = M->getASTContext();
auto self = domainDecl->getImplicitSelfDecl();
auto selfRef = new (C) DeclRefExpr(self, DeclNameLoc(), /*implicit*/ true);
auto stringType = TypeExpr::createImplicitForDecl(
DeclNameLoc(), C.getStringDecl(), domainDecl,
C.getStringDecl()->getInterfaceType());
auto *argList = ArgumentList::forImplicitSingle(
C, C.getIdentifier("reflecting"), selfRef);
auto *initReflectingCall = CallExpr::createImplicit(C, stringType, argList);
auto *ret = ReturnStmt::createImplicit(C, initReflectingCall);
auto body = BraceStmt::create(C, SourceLoc(), ASTNode(ret), SourceLoc());
return { body, /*isTypeChecked=*/false };
}
static std::pair<BraceStmt *, bool>
deriveBodyBridgedNSError_printAsObjCEnum_nsErrorDomain(
AbstractFunctionDecl *domainDecl, void *) {
// enum SomeEnum {
// @derived
// static var _nsErrorDomain: String {
// return "ModuleName.SomeEnum"
// }
// }
auto M = domainDecl->getParentModule();
auto &C = M->getASTContext();
auto TC = domainDecl->getInnermostTypeContext();
auto ED = TC->getSelfEnumDecl();
StringRef value(C.AllocateCopy(getErrorDomainStringForObjC(ED)));
auto string = new (C) StringLiteralExpr(value, SourceRange(), /*implicit*/ true);
auto *ret = ReturnStmt::createImplicit(C, SourceLoc(), string);
auto body = BraceStmt::create(C, SourceLoc(),
ASTNode(ret),
SourceLoc());
return { body, /*isTypeChecked=*/false };
}
static ValueDecl *
deriveBridgedNSError_enum_nsErrorDomain(
DerivedConformance &derived,
std::pair<BraceStmt *, bool> (*synthesizer)(AbstractFunctionDecl *, void*)) {
// enum SomeEnum {
// @derived
// static var _nsErrorDomain: String {
// ...
// }
// }
auto stringTy = derived.Context.getStringType();
// Define the property.
VarDecl *propDecl;
PatternBindingDecl *pbDecl;
std::tie(propDecl, pbDecl) = derived.declareDerivedProperty(
DerivedConformance::SynthesizedIntroducer::Var,
derived.Context.Id_nsErrorDomain, stringTy, stringTy, /*isStatic=*/true,
/*isFinal=*/true);
addNonIsolatedToSynthesized(derived.Nominal, propDecl);
// Define the getter.
auto getterDecl = derived.addGetterToReadOnlyDerivedProperty(
propDecl, stringTy);
getterDecl->setBodySynthesizer(synthesizer);
derived.addMembersToConformanceContext({propDecl, pbDecl});
return propDecl;
}
ValueDecl *DerivedConformance::deriveBridgedNSError(ValueDecl *requirement) {
if (!isa<EnumDecl>(Nominal))
return nullptr;
if (requirement->getBaseName() == Context.Id_nsErrorDomain) {
auto synthesizer = deriveBodyBridgedNSError_enum_nsErrorDomain;
auto scope = Nominal->getFormalAccessScope(Nominal->getModuleScopeContext());
if (scope.isPublic() || scope.isInternal())
// PrintAsClang may print this domain, so we should make sure we use the
// same string it will.
synthesizer = deriveBodyBridgedNSError_printAsObjCEnum_nsErrorDomain;
return deriveBridgedNSError_enum_nsErrorDomain(*this, synthesizer);
}
Context.Diags.diagnose(requirement->getLoc(),
diag::broken_errortype_requirement);
return nullptr;
}
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