64 lines
3.8 KiB
JavaScript
64 lines
3.8 KiB
JavaScript
/*
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* Copyright (C) 2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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"use strict";
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function inferTypesForCall(func, typeArguments, argumentTypes, returnType)
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{
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if (typeArguments.length && typeArguments.length != func.typeParameters.length)
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return {failure: new OverloadResolutionFailure(func, "Wrong number of type arguments (passed " + typeArguments.length + ", require " + func.typeParameters.length + ")")};
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if (argumentTypes.length != func.parameters.length)
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return {failure: new OverloadResolutionFailure(func, "Wrong number of arguments (passed " + argumentTypes.length + ", require " + func.parameters.length + ")")};
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let unificationContext = new UnificationContext(func.typeParametersForCallResolution);
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for (let i = 0; i < typeArguments.length; ++i) {
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let argument = typeArguments[i];
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let parameter = func.typeParameters[i];
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if (!argument.unify(unificationContext, parameter))
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return {failure: new OverloadResolutionFailure(func, "Type argument #" + (i + 1) + " for parameter " + parameter.name + " does not match (passed " + argument + ", require " + parameter + ")")};
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}
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for (let i = 0; i < argumentTypes.length; ++i) {
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if (!argumentTypes[i])
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throw new Error("Null argument type at i = " + i);
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if (!argumentTypes[i].unify(unificationContext, func.parameters[i].type))
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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 + ")")};
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}
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if (returnType && !returnType.unify(unificationContext, func.returnType))
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return {failure: new OverloadResolutionFailure(func, "Return type " + func.returnType + " does not match " + returnType)};
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let verificationResult = unificationContext.verify();
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if (!verificationResult.result)
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return {failure: new OverloadResolutionFailure(func, verificationResult.reason)};
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let shouldBuildTypeArguments = !typeArguments.length;
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if (shouldBuildTypeArguments)
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typeArguments = [];
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for (let typeParameter of func.typeParameters) {
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let typeArgument = unificationContext.find(typeParameter);
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if (typeArgument == typeParameter)
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return {failure: new OverloadResolutionFailure(func, "Type parameter " + typeParameter + " did not get assigned a type")};
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if (shouldBuildTypeArguments)
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typeArguments.push(typeArgument);
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}
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return {func, unificationContext, typeArguments};
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}
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