Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System/regex/system/text/regularexpressions/RegexCaptureCollection.cs

@@ -0,0 +1,219 @@
+//------------------------------------------------------------------------------
+// <copyright file="RegexCaptureCollection.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+// The CaptureCollection lists the captured Capture numbers
+// contained in a compiled Regex.
+
+namespace System.Text.RegularExpressions {
+
+    using System.Collections;
+
+    /*
+     * This collection returns the Captures for a group
+     * in the order in which they were matched (left to right
+     * or right to left). It is created by Group.Captures
+     */
+    /// <devdoc>
+    ///    <para>
+    ///       Represents a sequence of capture substrings. The object is used
+    ///       to return the set of captures done by a single capturing group.
+    ///    </para>
+    /// </devdoc>
+#if !SILVERLIGHT
+    [ Serializable() ]
+#endif
+    public class CaptureCollection : ICollection {
+        internal Group _group;
+        internal int _capcount;
+        internal Capture[] _captures;
+
+        /*
+         * Nonpublic constructor
+         */
+        internal CaptureCollection(Group group) {
+            _group = group;
+            _capcount = _group._capcount;
+        }
+
+        /*
+         * The object on which to synchronize
+         */
+        /// <devdoc>
+        ///    <para>[To be supplied.]</para>
+        /// </devdoc>
+        public Object SyncRoot {
+            get {
+                return _group;
+            }
+        }
+
+        /*
+         * ICollection
+         */
+        /// <devdoc>
+        ///    <para>[To be supplied.]</para>
+        /// </devdoc>
+        public bool IsSynchronized {
+            get {
+                return false;
+            }
+        }
+
+        /*
+         * ICollection
+         */
+        /// <devdoc>
+        ///    <para>[To be supplied.]</para>
+        /// </devdoc>
+        public bool IsReadOnly {
+            get {
+                return true;
+            }
+        }
+
+        /*
+         * The number of captures for the group
+         */
+        /// <devdoc>
+        ///    <para>
+        ///       Returns the number of captures.
+        ///    </para>
+        /// </devdoc>
+        public int Count {
+            get {
+                return _capcount;
+            }
+        }
+
+        /*
+         * The ith capture in the group
+         */
+        /// <devdoc>
+        ///    <para>
+        ///       Provides a means of accessing a specific capture in the collection.
+        ///    </para>
+        /// </devdoc>
+        public Capture this[int i]
+        {
+            get {
+                return GetCapture(i);
+            }
+        }
+
+        /*
+         * As required by ICollection
+         */
+        /// <devdoc>
+        ///    <para>
+        ///       Copies all the elements of the collection to the given array
+        ///       beginning at the given index.
+        ///    </para>
+        /// </devdoc>
+        public void CopyTo(Array array, int arrayIndex) {
+            if (array == null)
+                throw new ArgumentNullException("array");
+
+            for (int i = arrayIndex, j = 0; j < Count; i++, j++) {
+                array.SetValue(this[j], i);
+            }
+        }
+
+        /*
+         * As required by ICollection
+         */
+        /// <devdoc>
+        ///    <para>
+        ///       Provides an enumerator in the same order as Item[].
+        ///    </para>
+        /// </devdoc>
+        public IEnumerator GetEnumerator() {
+            return new CaptureEnumerator(this);
+        }
+
+        /*
+         * Nonpublic code to return set of captures for the group
+         */
+        internal Capture GetCapture(int i) {
+            if (i == _capcount - 1 && i >= 0)
+                return _group;
+
+            if (i >= _capcount || i < 0)
+                throw new ArgumentOutOfRangeException("i");
+
+            // first time a capture is accessed, compute them all
+            if (_captures == null) {
+                _captures = new Capture[_capcount];
+                for (int j = 0; j < _capcount - 1; j++) {
+                    _captures[j] = new Capture(_group._text, _group._caps[j * 2], _group._caps[j * 2 + 1]);
+                }
+            }
+
+            return _captures[i];
+        }
+    }
+
+
+    /*
+     * This non-public enumerator lists all the captures
+     * Should it be public?
+     */
+#if !SILVERLIGHT
+    [ Serializable() ]
+#endif
+    internal class CaptureEnumerator : IEnumerator {
+        internal CaptureCollection _rcc;
+        internal int _curindex;
+
+        /*
+         * Nonpublic constructor
+         */
+        internal CaptureEnumerator(CaptureCollection rcc) {
+            _curindex = -1;
+            _rcc = rcc;
+        }
+
+        /*
+         * As required by IEnumerator
+         */
+        public bool MoveNext() {
+            int size = _rcc.Count;
+
+            if (_curindex >= size)
+                return false;
+
+            _curindex++;
+
+            return(_curindex < size);
+        }
+
+        /*
+         * As required by IEnumerator
+         */
+        public Object Current {
+            get { return Capture;}
+        }
+
+        /*
+         * Returns the current capture
+         */
+        public Capture Capture {
+            get {
+                if (_curindex < 0 || _curindex >= _rcc.Count)
+                    throw new InvalidOperationException(SR.GetString(SR.EnumNotStarted));
+
+                return _rcc[_curindex];
+            }
+        }
+
+        /*
+         * Reset to before the first item
+         */
+        public void Reset() {
+            _curindex = -1;
+        }
+    }
+
+}