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/*
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Rhino code, released
* May 6, 1999.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1997-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Bob Jervis
* Google Inc.
*
* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License Version 2 or later (the "GPL"), in which
* case the provisions of the GPL are applicable instead of those above. If
* you wish to allow use of your version of this file only under the terms of
* the GPL and not to allow others to use your version of this file under the
* MPL, indicate your decision by deleting the provisions above and replacing
* them with the notice and other provisions required by the GPL. If you do
* not delete the provisions above, a recipient may use your version of this
* file under either the MPL or the GPL.
*
* ***** END LICENSE BLOCK ***** */
package com.google.javascript.rhino.jstype;
import static com.google.javascript.rhino.jstype.TernaryValue.FALSE;
import static com.google.javascript.rhino.jstype.TernaryValue.TRUE;
import com.google.javascript.rhino.ErrorReporter;
import com.google.javascript.rhino.Node;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
/**
* An enum type representing a branded collection of elements. Each element
* is referenced by its name, and has an {@link EnumElementType} type.
*/
public class EnumType extends PrototypeObjectType {
private static final long serialVersionUID = 1L;
// the type of the individual elements
private EnumElementType elementsType;
// the elements' names (they all have the same type)
private final Set elements = new HashSet<>();
/**
* Creates an enum type.
*
* @param name the enum's name
* @param elementsType the base type of the individual elements
*/
EnumType(JSTypeRegistry registry, String name, Node source,
JSType elementsType) {
super(registry, "enum{" + name + "}", null);
this.elementsType = new EnumElementType(registry, elementsType, name, this);
}
@Override
public EnumType toMaybeEnumType() {
return this;
}
@Override
public ObjectType getImplicitPrototype() {
return registry.getNativeObjectType(JSTypeNative.OBJECT_TYPE);
}
/**
* Gets the elements defined on this enum.
* @return the elements' names defined on this enum. The returned set is
* immutable.
*/
public Set getElements() {
return Collections.unmodifiableSet(elements);
}
/**
* Defines a new element on this enum.
* @param name the name of the new element
* @param definingNode the {@code Node} that defines this new element
* @return true iff the new element is added successfully
*/
public boolean defineElement(String name, Node definingNode) {
elements.add(name);
return defineDeclaredProperty(name, elementsType, definingNode);
}
/** Gets the elements' type, which is a subtype of the enumerated type. */
public EnumElementType getElementsType() {
return elementsType;
}
/** Gets the enumerated type. */
@Override
public JSType getEnumeratedTypeOfEnumObject() {
return elementsType.getPrimitiveType();
}
@Override
public TernaryValue testForEquality(JSType that) {
TernaryValue result = super.testForEquality(that);
if (result != null) {
return result;
}
return this.isEquivalentTo(that) ? TRUE : FALSE;
}
@Override
public boolean isSubtype(JSType that) {
return isSubtype(that, ImplCache.create(), SubtypingMode.NORMAL);
}
@Override
protected boolean isSubtype(JSType that,
ImplCache implicitImplCache, SubtypingMode subtypingMode) {
return that.isEquivalentTo(getNativeType(JSTypeNative.OBJECT_TYPE)) ||
that.isEquivalentTo(getNativeType(JSTypeNative.OBJECT_PROTOTYPE)) ||
JSType.isSubtypeHelper(this, that, implicitImplCache, subtypingMode);
}
@Override
StringBuilder appendTo(StringBuilder sb, boolean forAnnotations) {
return sb.append(forAnnotations ? "!Object" : getReferenceName());
}
@Override
public String getDisplayName() {
return elementsType.getDisplayName();
}
@Override
public T visit(Visitor visitor) {
return visitor.caseObjectType(this);
}
@Override T visit(RelationshipVisitor visitor, JSType that) {
return visitor.caseObjectType(this, that);
}
@Override
public FunctionType getConstructor() {
return null;
}
@Override
public boolean matchesNumberContext() {
return false;
}
@Override
public boolean matchesStringContext() {
return true;
}
@Override
public boolean matchesObjectContext() {
return true;
}
@Override
JSType resolveInternal(ErrorReporter reporter) {
elementsType = (EnumElementType) elementsType.resolve(reporter);
return super.resolveInternal(reporter);
}
}