* 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";
function inferTypesForCall(func, typeArguments, argumentTypes, returnType)
{
if (typeArguments.length && typeArguments.length != func.typeParameters.length)
return {failure: new OverloadResolutionFailure(func, "Wrong number of type arguments (passed " + typeArguments.length + ", require " + func.typeParameters.length + ")")};
if (argumentTypes.length != func.parameters.length)
return {failure: new OverloadResolutionFailure(func, "Wrong number of arguments (passed " + argumentTypes.length + ", require " + func.parameters.length + ")")};
let unificationContext = new UnificationContext(func.typeParametersForCallResolution);
for (let i = 0; i < typeArguments.length; ++i) {
let argument = typeArguments[i];
let parameter = func.typeParameters[i];
if (!argument.unify(unificationContext, parameter))
return {failure: new OverloadResolutionFailure(func, "Type argument #" + (i + 1) + " for parameter " + parameter.name + " does not match (passed " + argument + ", require " + parameter + ")")};
}
for (let i = 0; i < argumentTypes.length; ++i) {
if (!argumentTypes[i])
throw new Error("Null argument type at i = " + i);
if (!argumentTypes[i].unify(unificationContext, func.parameters[i].type))
return {failure: new OverloadResolutionFailure(func, "Argument #" + (i + 1) + " " + (func.parameters[i].name ? "for parameter " + func.parameters[i].name + " " : "") + "does not match (passed " + argumentTypes[i] + ", require " + func.parameters[i].type + ")")};
}
if (returnType && !returnType.unify(unificationContext, func.returnType))
return {failure: new OverloadResolutionFailure(func, "Return type " + func.returnType + " does not match " + returnType)};
let verificationResult = unificationContext.verify();
if (!verificationResult.result)
return {failure: new OverloadResolutionFailure(func, verificationResult.reason)};
let shouldBuildTypeArguments = !typeArguments.length;
if (shouldBuildTypeArguments)
typeArguments = [];
for (let typeParameter of func.typeParameters) {
let typeArgument = unificationContext.find(typeParameter);
if (typeArgument == typeParameter)
return {failure: new OverloadResolutionFailure(func, "Type parameter " + typeParameter + " did not get assigned a type")};
if (shouldBuildTypeArguments)
typeArguments.push(typeArgument);
}
return {func, unificationContext, typeArguments};
}
