| /* |
| * 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, []); |
| } |
| }); |
| } |
| } |
