CapabilitiesPattern.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 / xsp / System / Web / Configuration / CapabilitiesPattern.cs / 1 / CapabilitiesPattern.cs
                        

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

namespace System.Web.Configuration { 
 
    using System.Collections;
    using System.Collections.Specialized; 
    using System.Diagnostics;
    using System.Globalization;
    using System.Reflection;
    using System.Security; 
    using System.Text;
    using System.Text.RegularExpressions; 
    using System.Threading; 
    using System.Web.Caching;
    using System.Web.Compilation; 
    using System.Web.Hosting;
    using System.Security.Permissions;

    // 
    // Represents a single pattern to be expanded
    // 
    internal class CapabilitiesPattern { 
        internal String[]    _strings;
        internal int[]       _rules; 

        internal const int Literal    = 0;    // literal string
        internal const int Reference  = 1;    // regex reference ${name} or $number
        internal const int Variable   = 2;    // regex reference %{name} 

        internal static readonly Regex refPat = new Regex("\\G\\$(?:(?\\d+)|\\{(?\\w+)\\})"); 
        internal static readonly Regex varPat = new Regex("\\G\\%\\{(?\\w+)\\}"); 
        internal static readonly Regex textPat = new Regex("\\G[^$%\\\\]*(?:\\.[^$%\\\\]*)*");
        internal static readonly Regex errorPat = new Regex(".{0,8}"); 

        internal static readonly CapabilitiesPattern Default = new CapabilitiesPattern();

        internal CapabilitiesPattern() { 
            _strings = new String[1];
            _strings[0] = String.Empty; 
            _rules = new int[1]; 
            _rules[0] = Variable;
        } 

        internal CapabilitiesPattern(String text) {
            ArrayList strings = new ArrayList();
            ArrayList rules = new ArrayList(); 

            int textpos = 0; 
 
            for (;;) {
                Match match = null; 

                // 1: scan text

                if ((match = textPat.Match(text, textpos)).Success && match.Length > 0) { 
                    rules.Add(Literal);
                    strings.Add(Regex.Unescape(match.ToString())); 
                    textpos = match.Index + match.Length; 
                }
 
                if (textpos == text.Length)
                    break;

                // 2: look for regex references 

                if ((match = refPat.Match(text, textpos)).Success) { 
                    rules.Add(Reference); 
                    strings.Add(match.Groups["name"].Value);
                } 

                // 3: look for variables

                else if ((match = varPat.Match(text, textpos)).Success) { 
                    rules.Add(Variable);
                    strings.Add(match.Groups["name"].Value); 
                } 

                // 4: encountered a syntax error ( 

                else {
                    match = errorPat.Match(text, textpos);
 
                    throw new ArgumentException(
                                               SR.GetString(SR.Unrecognized_construct_in_pattern, match.ToString(), text)); 
                } 

                textpos = match.Index + match.Length; 
            }

            _strings = (String[])strings.ToArray(typeof(String));
 
            _rules = new int[rules.Count];
            for (int i = 0; i < rules.Count; i++) 
                _rules[i] = (int)rules[i]; 
        }
 
        internal virtual String Expand(CapabilitiesState matchstate) {
            StringBuilder sb = null;
            String result = null;
 
            for (int i = 0; i < _rules.Length; i++) {
                if (sb == null && result != null) 
                    sb = new StringBuilder(result); 

                switch (_rules[i]) { 
                    case Literal:
                        result = _strings[i];
                        break;
 
                    case Reference:
                        result = matchstate.ResolveReference(_strings[i]); 
                        break; 

                    case Variable: 
                        result = matchstate.ResolveVariable(_strings[i]);
                        break;
                }
 
                if (sb != null && result != null)
                    sb.Append(result); 
            } 

            if (sb != null) 
                return sb.ToString();

            if (result != null)
                return result; 

            return String.Empty; 
        } 

#if DBG 
        internal virtual String Dump() {
            StringBuilder sb = new StringBuilder();

            for (int i = 0; i < _rules.Length; i++) { 
                switch (_rules[i]) {
                    case Literal: 
                        sb.Append("\"" + _strings[i] + "\""); 
                        break;
                    case Reference: 
                        sb.Append("${" + _strings[i] + "}");
                        break;
                    default:
                        sb.Append("??"); 
                        break;
                } 
 
                if (i < _rules.Length - 1)
                    sb.Append(" "); 
            }

            return sb.ToString();
        } 

        internal virtual String Dump(String indent) { 
            return indent + Dump() + "\n"; 
        }
#endif 
    }
}

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