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98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
//===--- OptionalTryMigratorPass.cpp -------------------------------------------===//
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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 - 2018 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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#include "swift/AST/ASTVisitor.h"
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#include "swift/AST/Expr.h"
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#include "swift/AST/FileUnit.h"
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#include "swift/AST/Module.h"
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#include "swift/AST/NameLookup.h"
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#include "swift/AST/ParameterList.h"
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#include "swift/AST/Types.h"
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#include "swift/IDE/SourceEntityWalker.h"
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#include "swift/Migrator/ASTMigratorPass.h"
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#include "swift/Parse/Lexer.h"
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using namespace swift;
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using namespace swift::migrator;
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namespace {
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class OptionalTryMigratorPass: public ASTMigratorPass,
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public SourceEntityWalker {
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bool explicitCastActiveForOptionalTry = false;
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bool walkToExprPre(Expr *E) override {
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if (dyn_cast<ParenExpr>(E) || E->isImplicit()) {
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// Look through parentheses and implicit expressions.
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return true;
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}
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if (isa<ExplicitCastExpr>(E)) {
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// If the user has already provided an explicit cast for the
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// 'try?', then we don't need to add one. So let's track whether
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// one is active
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explicitCastActiveForOptionalTry = true;
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}
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else if (const auto *optTryExpr = dyn_cast<OptionalTryExpr>(E)) {
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wrapTryInCastIfNeeded(optTryExpr);
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return false;
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}
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else if (explicitCastActiveForOptionalTry) {
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// If an explicit cast is active and we are entering a new
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// expression that is not an OptionalTryExpr, then the cast
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// does not apply to the OptionalTryExpr.
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explicitCastActiveForOptionalTry = false;
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}
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return true;
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}
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bool walkToExprPost(Expr *E) override {
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explicitCastActiveForOptionalTry = false;
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return true;
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}
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void wrapTryInCastIfNeeded(const OptionalTryExpr *optTryExpr) {
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if (explicitCastActiveForOptionalTry) {
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// There's already an explicit cast here; we don't need to add anything
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return;
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}
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if (!optTryExpr->getSubExpr()->getType()->getOptionalObjectType()) {
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// This 'try?' doesn't wrap an optional, so its behavior does not
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// change from Swift 4 to Swift 5
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return;
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}
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Type typeToPreserve = optTryExpr->getType();
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auto typeName = typeToPreserve->getStringAsComponent();
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auto range = optTryExpr->getSourceRange();
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auto charRange = Lexer::getCharSourceRangeFromSourceRange(SM, range);
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Editor.insertWrap("((", charRange, (Twine(") as ") + typeName + ")").str());
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}
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public:
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OptionalTryMigratorPass(EditorAdapter &Editor,
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SourceFile *SF,
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const MigratorOptions &Opts)
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: ASTMigratorPass(Editor, SF, Opts) {}
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};
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} // end anonymous namespace
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void migrator::runOptionalTryMigratorPass(EditorAdapter &Editor,
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SourceFile *SF,
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const MigratorOptions &Opts) {
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OptionalTryMigratorPass { Editor, SF, Opts }.walk(SF);
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}
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