RegexGroup.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Regex / System / Text / RegularExpressions / RegexGroup.cs / 1 / RegexGroup.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

// Group represents the substring or substrings that 
// are captured by a single capturing group after one 
// regular expression match.
 
namespace System.Text.RegularExpressions {
    using System.Security.Permissions;

    ///  
    ///    Group
    ///       represents the results from a single capturing group. A capturing group can 
    ///       capture zero, one, or more strings in a single match because of quantifiers, so 
    ///       Group supplies a collection of Capture objects.
    ///     
    [ Serializable() ]
    public class Group : Capture {
        // the empty group object
        internal static Group   _emptygroup = new Group(String.Empty, new int[0], 0); 

        internal int[] _caps; 
        internal int _capcount; 
        internal CaptureCollection _capcoll;
 
        internal Group(String text, int[] caps, int capcount)

        : base(text, capcount == 0 ? 0 : caps[(capcount - 1) * 2],
               capcount == 0 ? 0 : caps[(capcount * 2) - 1]) { 

            _caps = caps; 
            _capcount = capcount; 
        }
 
        /*
         * True if the match was successful
         */
        ///  
        ///    Indicates whether the match is successful.
        ///  
        public bool Success { 
            get {
                return _capcount != 0; 
            }
        }

        /* 
         * The collection of all captures for this group
         */ 
        ///  
        ///    
        ///       Returns a collection of all the captures matched by the capturing 
        ///       group, in innermost-leftmost-first order (or innermost-rightmost-first order if
        ///       compiled with the "r" option). The collection may have zero or more items.
        ///    
        ///  
        public CaptureCollection Captures {
            get { 
                if (_capcoll == null) 
                    _capcoll = new CaptureCollection(this);
 
                return _capcoll;
            }
        }
 
        /*
         * Convert to a thread-safe object by precomputing cache contents 
         */ 
        /// 
        ///    Returns 
        ///       a Group object equivalent to the one supplied that is safe to share between
        ///       multiple threads.
        /// 
        [HostProtection(Synchronization=true)] 
        static public Group Synchronized(Group inner) {
            if (inner == null) 
                throw new ArgumentNullException("inner"); 

            // force Captures to be computed. 

            CaptureCollection capcoll;
            Capture dummy;
 
            capcoll = inner.Captures;
 
            if (inner._capcount > 0) 
                dummy = capcoll[0];
 
            return inner;
        }
    }
 

}

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