com.google.javascript.rhino.JSTypeExpression Maven / Gradle / Ivy
/*
*
* ***** 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
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package com.google.javascript.rhino;
import com.google.javascript.rhino.jstype.JSType;
import com.google.javascript.rhino.jstype.JSTypeRegistry;
import com.google.javascript.rhino.jstype.StaticTypedScope;
import java.io.Serializable;
/**
* Represents a type expression as a miniature Rhino AST, so that the
* type expression can be evaluated later.
*
* @author [email protected] (Nick Santos)
*/
public final class JSTypeExpression implements Serializable {
private static final long serialVersionUID = 1L;
/** The root of the AST. */
private final Node root;
/** The source name where the type expression appears. */
private final String sourceName;
public JSTypeExpression(Node root, String sourceName) {
this.root = root;
this.sourceName = sourceName;
}
/**
* Make the given type expression into an optional type expression,
* if possible.
*/
public static JSTypeExpression makeOptionalArg(JSTypeExpression expr) {
if (expr.isOptionalArg() || expr.isVarArgs()) {
return expr;
} else {
return new JSTypeExpression(
new Node(Token.EQUALS, expr.root), expr.sourceName);
}
}
/**
* @return Whether this expression denotes an optional {@code @param}.
*/
public boolean isOptionalArg() {
return root.getToken() == Token.EQUALS;
}
/**
* @return Whether this expression denotes a rest args {@code @param}.
*/
public boolean isVarArgs() {
return root.getToken() == Token.ELLIPSIS;
}
/**
* Evaluates the type expression into a {@code JSType} object.
*/
public JSType evaluate(StaticTypedScope scope, TypeIRegistry registry) {
if (registry instanceof JSTypeRegistry) {
JSType type = ((JSTypeRegistry) registry).createTypeFromCommentNode(root, sourceName, scope);
root.setJSType(type);
return type;
}
return null;
}
@Override
public boolean equals(Object other) {
return other instanceof JSTypeExpression &&
((JSTypeExpression) other).root.isEquivalentTo(root);
}
@Override
public int hashCode() {
return root.toStringTree().hashCode();
}
/**
* @return The source for this type expression. Note that it will not
* contain an expression if there's an @override tag.
*/
public Node getRoot() {
return root;
}
@Override
public String toString() {
return "type: " + root.toStringTree();
}
public JSTypeExpression clone() {
return new JSTypeExpression(root.cloneTree(), sourceName);
}
}