| /* |
| * 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}; |
| } |
| |