* Copyright (C) 2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
"use strict";
class TypeDefResolver extends Visitor {
constructor()
{
super();
this._visiting = new VisitingSet();
}
visitTypeRef(node)
{
this._visiting.doVisit(node, () => {
for (let typeArgument of node.typeArguments)
typeArgument.visit(this);
if (node.type instanceof TypeDef) {
let unificationContext = new UnificationContext(node.type.typeParameters);
if (node.typeArguments.length != node.type.typeParameters.length)
throw new Error("argument/parameter mismatch (should have been caught earlier)");
for (let i = 0; i < node.typeArguments.length; ++i)
node.typeArguments[i].unify(unificationContext, node.type.typeParameters[i]);
let verificationResult = unificationContext.verify();
if (!verificationResult.result)
throw new WTypeError(node.origin.originString, "Type reference to a type definition violates protocol constraints: " + verificationResult.reason);
let newType = node.type.type.substituteToUnification(node.type.typeParameters, unificationContext);
newType.visit(this);
node.setTypeAndArguments(newType, []);
}
});
}
}
