| // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| part of types; |
| |
| /** |
| * A type mask represents a set of contained classes, but the |
| * operations on it are not guaranteed to be precise and they may |
| * yield conservative answers that contain too many classes. |
| */ |
| abstract class TypeMask { |
| factory TypeMask(ClassElement base, int kind, bool isNullable) |
| => new FlatTypeMask(base, kind, isNullable); |
| |
| const factory TypeMask.empty() = FlatTypeMask.empty; |
| |
| factory TypeMask.exact(ClassElement base) |
| => new FlatTypeMask.exact(base); |
| factory TypeMask.subclass(ClassElement base) |
| => new FlatTypeMask.subclass(base); |
| factory TypeMask.subtype(ClassElement base) |
| => new FlatTypeMask.subtype(base); |
| |
| const factory TypeMask.nonNullEmpty() = FlatTypeMask.nonNullEmpty; |
| factory TypeMask.nonNullExact(ClassElement base) |
| => new FlatTypeMask.nonNullExact(base); |
| factory TypeMask.nonNullSubclass(ClassElement base) |
| => new FlatTypeMask.nonNullSubclass(base); |
| factory TypeMask.nonNullSubtype(ClassElement base) |
| => new FlatTypeMask.nonNullSubtype(base); |
| |
| factory TypeMask.unionOf(Iterable<TypeMask> masks, Compiler compiler) { |
| return UnionTypeMask.unionOf(masks, compiler); |
| } |
| |
| /** |
| * Returns a nullable variant of [this] type mask. |
| */ |
| TypeMask nullable(); |
| |
| /** |
| * Returns a non-nullable variant of [this] type mask. |
| */ |
| TypeMask nonNullable(); |
| |
| TypeMask simplify(Compiler compiler); |
| |
| bool get isEmpty; |
| bool get isNullable; |
| bool get isExact; |
| |
| bool get isUnion; |
| bool get isContainer; |
| bool get isForwarding; |
| |
| bool containsOnlyInt(Compiler compiler); |
| bool containsOnlyDouble(Compiler compiler); |
| bool containsOnlyNum(Compiler compiler); |
| bool containsOnlyBool(Compiler compiler); |
| bool containsOnlyString(Compiler compiler); |
| bool containsOnly(ClassElement element); |
| |
| /** |
| * Returns whether this type mask is a subtype of [other]. |
| */ |
| bool isInMask(TypeMask other, Compiler compiler); |
| |
| /** |
| * Returns whether [other] is a subtype of this type mask. |
| */ |
| bool containsMask(TypeMask other, Compiler compiler); |
| |
| /** |
| * Returns whether this type mask is an instance of [cls]. |
| */ |
| bool satisfies(ClassElement cls, Compiler compiler); |
| |
| /** |
| * Returns whether or not this type mask contains the given type. |
| */ |
| bool contains(ClassElement type, Compiler compiler); |
| |
| /** |
| * Returns whether or not this type mask contains all types. |
| */ |
| bool containsAll(Compiler compiler); |
| |
| /** |
| * Returns the [ClassElement] if this type represents a single class, |
| * otherwise returns `null`. This method is conservative. |
| */ |
| ClassElement singleClass(Compiler compiler); |
| |
| /** |
| * Returns a type mask representing the union of [this] and [other]. |
| */ |
| TypeMask union(TypeMask other, Compiler compiler); |
| |
| /** |
| * Returns a type mask representing the intersection of [this] and [other]. |
| */ |
| TypeMask intersection(TypeMask other, Compiler compiler); |
| |
| /** |
| * Returns whether this [TypeMask] applied to [selector] can hit a |
| * [noSuchMethod]. |
| */ |
| bool needsNoSuchMethodHandling(Selector selector, Compiler compiler); |
| |
| /** |
| * Returns whether [element] is a potential target when being |
| * invoked on this type mask. [selector] is used to ensure library |
| * privacy is taken into account. |
| */ |
| bool canHit(Element element, Selector selector, Compiler compiler); |
| |
| /** |
| * Returns the [element] that is known to always be hit at runtime |
| * on this mask. Returns null if there is none. |
| */ |
| Element locateSingleElement(Selector selector, Compiler compiler); |
| } |