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// -------------------------------------------------------------------------------------------------
// <copyright file="FunctionExtensions.cs" company="Starion Group S.A.">
//
// Copyright (C) 2022-2026 Starion Group S.A.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// </copyright>
// ------------------------------------------------------------------------------------------------
namespace SysML2.NET.Core.POCO.Kernel.Functions
{
using System;
using System.Collections.Generic;
using System.Linq;
using SysML2.NET.Core.Core.Types;
using SysML2.NET.Core.Root.Namespaces;
using SysML2.NET.Core.POCO.Core.Classifiers;
using SysML2.NET.Core.POCO.Core.Features;
using SysML2.NET.Core.POCO.Core.Types;
using SysML2.NET.Core.POCO.Kernel.Behaviors;
using SysML2.NET.Core.POCO.Kernel.Expressions;
using SysML2.NET.Core.POCO.Root.Annotations;
using SysML2.NET.Core.POCO.Root.Elements;
using SysML2.NET.Core.POCO.Root.Namespaces;
using SysML2.NET.KernelFunctions;
/// <summary>
/// The <see cref="FunctionExtensions"/> class provides extensions methods for
/// the <see cref="IFunction"/> interface
/// </summary>
internal static class FunctionExtensions
{
/// <summary>
/// Computes the derived property.
/// </summary>
/// <param name="functionSubject">
/// The subject <see cref="IFunction"/>
/// </param>
/// <returns>
/// the computed result
/// </returns>
internal static List<IExpression> ComputeExpression(this IFunction functionSubject)
{
return functionSubject == null
? throw new ArgumentNullException(nameof(functionSubject))
: [.. functionSubject.feature.OfType<IExpression>()];
}
/// <summary>
/// Computes whether this <see cref="IFunction"/> is one of the Kernel Functions Library
/// functions that may be invoked by a model-level evaluable <see cref="IInvocationExpression"/>.
/// </summary>
/// <remarks>
/// There is no OCL derivation: KerML 1.0 §8.3.4.7.4 makes this a library-membership test, and
/// the member set is enumerated by Table 5 (§8.2.5.8.1) and Table 7 (§8.2.5.8.2).
/// </remarks>
/// <param name="functionSubject">
/// The subject <see cref="IFunction"/>
/// </param>
/// <returns>
/// <c>true</c> when the subject is a model-level evaluable library function, <c>false</c> otherwise
/// </returns>
/// <exception cref="ArgumentNullException">
/// Thrown when <paramref name="functionSubject"/> is <c>null</c>.
/// </exception>
internal static bool ComputeIsModelLevelEvaluable(this IFunction functionSubject)
{
return functionSubject == null
? throw new ArgumentNullException(nameof(functionSubject))
: ModelLevelEvaluableFunctions.Contains(functionSubject.owningNamespace?.name, functionSubject.name);
}
/// <summary>
/// Computes the derived property.
/// </summary>
/// <remarks>
/// OCL2.0:
/// <code>
/// result =
/// let resultParams : Sequence(Feature) =
/// featureMemberships->
/// selectByKind(ReturnParameterMembership).
/// ownedMemberParameter in
/// if resultParams->notEmpty() then resultParams->first()
/// else null
/// endif
/// </code>
/// </remarks>
/// <param name="functionSubject">
/// The subject <see cref="IFunction"/>
/// </param>
/// <returns>
/// the computed result
/// </returns>
internal static IFeature ComputeResult(this IFunction functionSubject)
{
if (functionSubject == null)
{
throw new ArgumentNullException(nameof(functionSubject));
}
var resultParams = functionSubject.featureMembership
.OfType<IReturnParameterMembership>()
.Select(returnParameterMembership => returnParameterMembership.ownedMemberParameter)
.ToList();
return resultParams.Count == 0 ? null : resultParams[0];
}
}
}