/
MatchCollection.cs
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/
MatchCollection.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
namespace System.Text.RegularExpressions
{
/// <summary>
/// Represents the set of names appearing as capturing group
/// names in a regular expression.
/// </summary>
[DebuggerDisplay("Count = {Count}")]
[DebuggerTypeProxy(typeof(CollectionDebuggerProxy<Match>))]
public class MatchCollection : IList<Match>, IReadOnlyList<Match>, IList
{
private readonly Regex _regex;
private readonly List<Match> _matches;
private readonly string _input;
private int _startat;
private int _prevlen;
private bool _done;
internal MatchCollection(Regex regex, string input, int startat)
{
if ((uint)startat > (uint)input.Length)
{
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.startat, ExceptionResource.BeginIndexNotNegative);
}
_regex = regex;
_input = input;
_startat = startat;
_prevlen = -1;
_matches = new List<Match>();
_done = false;
}
public bool IsReadOnly => true;
/// <summary>
/// Returns the number of captures.
/// </summary>
public int Count
{
get
{
EnsureInitialized();
return _matches.Count;
}
}
/// <summary>
/// Returns the ith Match in the collection.
/// </summary>
public virtual Match this[int i]
{
get
{
Match? match = null;
if (i < 0 || (match = GetMatch(i)) is null)
{
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.i);
}
return match;
}
}
/// <summary>Provides an enumerator in the same order as Item[i].</summary>
public IEnumerator GetEnumerator() => new Enumerator(this);
IEnumerator<Match> IEnumerable<Match>.GetEnumerator() => new Enumerator(this);
private Match? GetMatch(int i)
{
Debug.Assert(i >= 0, "i cannot be negative.");
if (_matches.Count > i)
{
return _matches[i];
}
if (_done)
{
return null;
}
Match match;
do
{
match = _regex.RunSingleMatch(RegexRunnerMode.FullMatchRequired, _prevlen, _input, 0, _input.Length, _startat)!;
if (!match.Success)
{
_done = true;
return null;
}
_matches.Add(match);
_prevlen = match.Length;
_startat = match._textpos;
} while (_matches.Count <= i);
return match;
}
private void EnsureInitialized()
{
if (!_done)
{
GetMatch(int.MaxValue);
}
}
public bool IsSynchronized => false;
public object SyncRoot => this;
public void CopyTo(Array array, int arrayIndex)
{
EnsureInitialized();
((ICollection)_matches).CopyTo(array, arrayIndex);
}
public void CopyTo(Match[] array, int arrayIndex)
{
EnsureInitialized();
_matches.CopyTo(array, arrayIndex);
}
int IList<Match>.IndexOf(Match item)
{
EnsureInitialized();
return _matches.IndexOf(item);
}
void IList<Match>.Insert(int index, Match item) =>
throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
void IList<Match>.RemoveAt(int index) =>
throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
Match IList<Match>.this[int index]
{
get => this[index];
set => throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
}
void ICollection<Match>.Add(Match item) =>
throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
void ICollection<Match>.Clear() =>
throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
bool ICollection<Match>.Contains(Match item)
{
EnsureInitialized();
return _matches.Contains(item);
}
bool ICollection<Match>.Remove(Match item) =>
throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
int IList.Add(object? value) =>
throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
void IList.Clear() =>
throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
bool IList.Contains(object? value) =>
value is Match && ((ICollection<Match>)this).Contains((Match)value);
int IList.IndexOf(object? value) =>
value is Match other ? ((IList<Match>)this).IndexOf(other) : -1;
void IList.Insert(int index, object? value) =>
throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
bool IList.IsFixedSize => true;
void IList.Remove(object? value) =>
throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
void IList.RemoveAt(int index) =>
throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
object? IList.this[int index]
{
get => this[index];
set => throw new NotSupportedException(SR.NotSupported_ReadOnlyCollection);
}
private sealed class Enumerator : IEnumerator<Match>
{
private readonly MatchCollection _collection;
private int _index;
internal Enumerator(MatchCollection collection)
{
Debug.Assert(collection != null, "collection cannot be null.");
_collection = collection;
_index = -1;
}
public bool MoveNext()
{
if (_index == -2)
{
return false;
}
_index++;
Match? match = _collection.GetMatch(_index);
if (match is null)
{
_index = -2;
return false;
}
return true;
}
public Match Current
{
get
{
if (_index < 0)
{
throw new InvalidOperationException(SR.EnumNotStarted);
}
return _collection.GetMatch(_index)!;
}
}
object IEnumerator.Current => Current;
void IEnumerator.Reset() => _index = -1;
void IDisposable.Dispose() { }
}
}
}