MegaBites-AI/Windows-powershell

1// Copyright (c) Microsoft Corporation.2// Licensed under the MIT License.3 4using System.Collections;5 6using Dbg = System.Management.Automation.Diagnostics;7 8namespace System.Management.Automation.Remoting9{10    /// <summary>11    /// Provides an enumerator for iterating through a multi-dimensional array.12    /// This is needed to encode multi-dimensional arrays in remote host methods.13    /// </summary>14    internal class Indexer : IEnumerable, IEnumerator15    {16        /// <summary>17        /// Current.18        /// </summary>19        private readonly int[] _current;20 21        /// <summary>22        /// Lengths.23        /// </summary>24        private readonly int[] _lengths;25 26        /// <summary>27        /// Current.28        /// </summary>29        public object Current30        {31            get32            {33                return _current;34            }35        }36 37        /// <summary>38        /// Constructor for Indexer.39        /// </summary>40        internal Indexer(int[] lengths)41        {42            Dbg.Assert(lengths != null, "Expected lengths != null");43            _lengths = lengths;44            Dbg.Assert(CheckLengthsNonNegative(lengths), "Expected CheckLengthsNonNegative(lengths)");45            _current = new int[lengths.Length];46        }47 48        /// <summary>49        /// Check lengths non negative.50        /// </summary>51        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]52        private static bool CheckLengthsNonNegative(int[] lengths)53        {54            for (int i = 0; i < lengths.Length; ++i)55            {56                if (lengths[i] < 0)57                {58                    return false;59                }60            }61 62            return true;63        }64 65        /// <summary>66        /// Get enumerator.67        /// </summary>68        public IEnumerator GetEnumerator()69        {70            this.Reset();71            return this;72        }73 74        /// <summary>75        /// Reset.76        /// </summary>77        public void Reset()78        {79            for (int i = 0; i < _current.Length; ++i)80            {81                _current[i] = 0;82            }83 84            // Set last value to -1 so that MoveNext makes this 0,0,...,0.85            if (_current.Length > 0)86            {87                _current[_current.Length - 1] = -1;88            }89        }90 91        /// <summary>92        /// Move next.93        /// </summary>94        public bool MoveNext()95        {96            for (int i = _lengths.Length - 1; i >= 0; --i)97            {98                // See if we can increment this dimension.99                if (_current[i] < _lengths[i] - 1)100                {101                    _current[i]++;102                    return true;103                }104 105                // Otherwise reset i and try to increment the next one.106                _current[i] = 0;107            }108 109            return false;110        }111    }112}113