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114 lines
3.9 KiB
C++
114 lines
3.9 KiB
C++
//===--- DerivedConformanceError.cpp - Derived Error ----------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements implicit derivation of the Error
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// protocol.
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//
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//===----------------------------------------------------------------------===//
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#include "TypeChecker.h"
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#include "DerivedConformances.h"
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#include "swift/AST/ArchetypeBuilder.h"
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#include "swift/AST/Decl.h"
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#include "swift/AST/Stmt.h"
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#include "swift/AST/Expr.h"
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#include "swift/AST/Types.h"
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using namespace swift;
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using namespace DerivedConformance;
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static void deriveBodyBridgedNSError_enum_nsErrorDomain(
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AbstractFunctionDecl *domainDecl) {
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// enum SomeEnum {
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// @derived
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// static var _nsErrorDomain: String {
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// return "ModuleName.SomeEnum"
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// }
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// }
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auto M = domainDecl->getParentModule();
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auto &C = M->getASTContext();
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auto TC = domainDecl->getInnermostTypeContext();
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auto ED = TC->getAsEnumOrEnumExtensionContext();
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std::string buffer = M->getNameStr();
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buffer += ".";
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buffer += ED->getNameStr();
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StringRef value(C.AllocateCopy(buffer));
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auto string = new (C) StringLiteralExpr(value, SourceRange(), /*implicit*/ true);
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auto ret = new (C) ReturnStmt(SourceLoc(), string, /*implicit*/ true);
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auto body = BraceStmt::create(C, SourceLoc(),
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ASTNode(ret),
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SourceLoc());
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domainDecl->setBody(body);
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}
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static ValueDecl *deriveBridgedNSError_enum_nsErrorDomain(TypeChecker &tc,
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Decl *parentDecl,
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EnumDecl *enumDecl) {
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// enum SomeEnum {
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// @derived
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// static var _nsErrorDomain: String {
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// return "\(self)"
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// }
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// }
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// Note that for @objc enums the format is assumed to be "MyModule.SomeEnum".
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// If this changes, please change PrintAsObjC as well.
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ASTContext &C = tc.Context;
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auto stringTy = C.getStringDecl()->getDeclaredType();
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// Define the getter.
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auto getterDecl = declareDerivedPropertyGetter(tc, parentDecl, enumDecl,
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stringTy, stringTy,
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/*isStatic=*/true,
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/*isFinal=*/true);
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getterDecl->setBodySynthesizer(&deriveBodyBridgedNSError_enum_nsErrorDomain);
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// Define the property.
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VarDecl *propDecl;
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PatternBindingDecl *pbDecl;
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std::tie(propDecl, pbDecl)
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= declareDerivedReadOnlyProperty(tc, parentDecl, enumDecl,
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C.Id_nsErrorDomain,
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stringTy, stringTy,
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getterDecl, /*isStatic=*/true,
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/*isFinal=*/true);
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auto dc = cast<IterableDeclContext>(parentDecl);
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dc->addMember(getterDecl);
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dc->addMember(propDecl);
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dc->addMember(pbDecl);
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return propDecl;
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}
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ValueDecl *DerivedConformance::deriveBridgedNSError(TypeChecker &tc,
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Decl *parentDecl,
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NominalTypeDecl *type,
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ValueDecl *requirement) {
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if (!isa<EnumDecl>(type))
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return nullptr;
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auto enumType = cast<EnumDecl>(type);
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if (requirement->getName() == tc.Context.Id_nsErrorDomain)
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return deriveBridgedNSError_enum_nsErrorDomain(tc, parentDecl, enumType);
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tc.diagnose(requirement->getLoc(),
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diag::broken_errortype_requirement);
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return nullptr;
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}
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