// (C) 2004 Novell, Inc.
//
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
using System;
using System.Collections;
-namespace System.Text.RegularExpressions
+namespace System.Text.RegularExpressions
{
[Serializable]
- public class MatchCollection: ICollection, IEnumerable
- {
+ public class MatchCollection: ICollection, IEnumerable {
+ private Match current;
+
+ // Stores all the matches before 'current'. If !current.Success, it has all the successful matches.
private ArrayList list;
/* No public constructor */
- internal MatchCollection () {
+ internal MatchCollection (Match start)
+ {
+ current = start;
list = new ArrayList ();
}
- public virtual int Count {
- get {
- return(list.Count);
- }
+ public int Count {
+ get { return FullList.Count; }
}
public bool IsReadOnly {
- get {
- return(true);
- }
+ get { return true; }
}
- public virtual bool IsSynchronized {
- get {
- return(false);
- }
+ public bool IsSynchronized {
+ get { return false; }
}
- public Match this[int i] {
- get {
- if (i < 0 ||
- i > Count) {
- throw new ArgumentOutOfRangeException ("Index is out of range");
- }
-
- return((Match)list[i]);
- }
- }
- public virtual object SyncRoot {
+ public virtual Match this [int i] {
get {
- return(list);
+ if (i < 0 || !TryToGet (i))
+ throw new ArgumentOutOfRangeException ("i");
+ return i < list.Count ? (Match) list [i] : current;
}
}
- public virtual void CopyTo (Array array, int index) {
- foreach (object o in list) {
- if (index > array.Length) {
- break;
- }
+ public object SyncRoot {
+ get { return list; }
+ }
- array.SetValue (o, index++);
- }
+ public void CopyTo (Array array, int index)
+ {
+ FullList.CopyTo (array, index);
}
- public virtual IEnumerator GetEnumerator () {
- return(new Enumerator (list));
+ public IEnumerator GetEnumerator ()
+ {
+ // If !current.Success, the list is fully populated. So, just use it.
+ return current.Success ? new Enumerator (this) : list.GetEnumerator ();
}
- internal void Add (object o) {
- list.Add (o);
+ // Returns true when: i < list.Count => this [i] == list [i]
+ // i == list.Count && current.Success => this [i] == current
+ private bool TryToGet (int i)
+ {
+ while (i > list.Count && current.Success) {
+ list.Add (current);
+ current = current.NextMatch ();
+ }
+ // Here we have: !(i > list.Count && current.Success)
+ // or in a slightly more useful form: i > list.Count => current.Success == false
+ return i < list.Count || current.Success;
}
- internal void Reverse () {
- list.Reverse ();
+ private ICollection FullList {
+ get {
+ if (TryToGet (Int32.MaxValue)) {
+ // list.Count == Int32.MaxValue && current.Success
+ // i.e., we have more than Int32.MaxValue matches.
+ // We can't represent that number with Int32.
+ throw new SystemException ("too many matches");
+ }
+ return list;
+ }
}
- private class Enumerator: IEnumerator {
- private IList list;
- private int ptr;
+ class Enumerator : IEnumerator {
+ int index;
+ MatchCollection coll;
- public Enumerator (IList list) {
- this.list = list;
- Reset ();
+ internal Enumerator (MatchCollection coll)
+ {
+ this.coll = coll;
+ index = -1;
}
- public object Current {
- get {
- if (ptr >= list.Count) {
- throw new InvalidOperationException ();
- }
-
- return(list[ptr]);
- }
+ void IEnumerator.Reset ()
+ {
+ index = -1;
}
- public bool MoveNext () {
- if (ptr > list.Count) {
- throw new InvalidOperationException ();
+ object IEnumerator.Current {
+ get {
+ if (index < 0)
+ throw new InvalidOperationException ("'Current' called before 'MoveNext()'");
+ if (index > coll.list.Count)
+ throw new SystemException ("MatchCollection in invalid state");
+ if (index == coll.list.Count && !coll.current.Success)
+ throw new InvalidOperationException ("'Current' called after 'MoveNext()' returned false");
+ return index < coll.list.Count ? coll.list [index] : coll.current;
}
-
- return(++ptr < list.Count);
}
- public void Reset () {
- ptr = -1;
+ bool IEnumerator.MoveNext ()
+ {
+ if (index > coll.list.Count)
+ throw new SystemException ("MatchCollection in invalid state");
+ if (index == coll.list.Count && !coll.current.Success)
+ return false;
+ return coll.TryToGet (++index);
}
}
}
}
-
-
-
projects / mono.git / blobdiff