BamlResourceContent.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / Globalization / BamlResourceContent.cs / 1305600 / BamlResourceContent.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: Utility that handles parsing Baml Resource Content 
// 
// History: 11/29/2003 garyyang Rewrote
// 
//---------------------------------------------------------------------------

using System;
using System.Text; 
using System.Text.RegularExpressions;
using System.Collections; 
using System.Diagnostics; 
using System.Collections.Generic;
 
using System.Windows;

namespace MS.Internal.Globalization
{ 
    internal static class BamlResourceContentUtil
    { 
        //------------------------------------- 
        // Internal methods
        //------------------------------------- 
        /// 
        /// Escape a string
        /// 
        internal static string EscapeString(string content) 
        {
            if (content == null) return null; 
 
            StringBuilder builder = new StringBuilder();
            for (int i = 0; i < content.Length; i++) 
            {
                switch (content[i])
                {
                    case BamlConst.ChildStart : 
                    case BamlConst.ChildEnd   :
                    case BamlConst.EscapeChar : 
                    { 
                        builder.Append(BamlConst.EscapeChar);
                        builder.Append(content[i]); 
                        break;
                    }
                    case '&' :
                    { 
                        builder.Append("&");
                        break; 
                    } 
                    case '<' :
                    { 
                        builder.Append("<");
                        break;
                    }
                    case '>' : 
                    {
                        builder.Append(">"); 
                        break; 
                    }
                    case '\'': 
                    {
                        builder.Append("'");
                        break;
                    } 
                    case '\"':
                    { 
                        builder.Append("""); 
                        break;
                    } 
                    default  :
                    {
                        builder.Append(content[i]);
                        break; 
                    }
                } 
            } 

            return builder.ToString(); 
        }

        /// 
        /// Unescape a string. Note: 
        /// Backslash following any character will become that character.
        /// Backslash by itself will be skipped. 
        ///  
        internal static string UnescapeString(string content)
        { 
            return UnescapePattern.Replace(
                content,
                UnescapeMatchEvaluator
                ); 
        }
 
        // Regular expression 
        // need to use 4 backslash here because it is escaped by compiler and regular expressions
        private static Regex UnescapePattern = new Regex("(\\\\.?|<|>|"|'|&)", RegexOptions.CultureInvariant | RegexOptions.Compiled); 

        // delegates to escape and unesacpe a matched pattern
        private static MatchEvaluator UnescapeMatchEvaluator = new MatchEvaluator(UnescapeMatch);
 
        /// 
        /// the delegate to Unescape the matched pattern 
        ///  
        private static string UnescapeMatch(Match match)
        { 
            switch (match.Value)
            {
                case "<"  : return "<";
                case ">"  : return ">"; 
                case "&" : return "&";
                case "'": return "'"; 
                case """: return "\""; 
                default:
                { 
                    // this is a '\' followed by 0 or 1 character
                    Debug.Assert(match.Value.Length > 0 && match.Value[0] == BamlConst.EscapeChar);
                    if (match.Value.Length == 2)
                    { 
                        return match.Value[1].ToString();
                    } 
                    else 
                    {
                        return string.Empty; 
                    }
                }
            }
        } 

        ///  
        /// Parse the input string into an array of text/child-placeholder tokens. 
        /// Element placeholders start with '#' and end with ';'.
        /// In case of error, a null array is returned. 
        /// 
        internal static BamlStringToken[] ParseChildPlaceholder(string input)
        {
            if (input == null) return null; 

            List tokens   = new List(8); 
            int tokenStart = 0; bool inPlaceHolder = false; 
            for (int i = 0; i < input.Length; i++)
            { 
                if (input[i] == BamlConst.ChildStart)
                {
                    if (i == 0 || input[i - 1]!= BamlConst.EscapeChar)
                    { 
                        if (inPlaceHolder)
                        { 
                            // All # needs to be escaped in a child place holder 
                            return null; // error
                        } 

                        inPlaceHolder = true;
                        if (tokenStart < i)
                        { 
                            tokens.Add(
                                new BamlStringToken( 
                                    BamlStringToken.TokenType.Text, 
                                    UnescapeString(input.Substring(tokenStart, i - tokenStart))
                                    ) 
                                );
                            tokenStart = i;
                        }
                    } 
                }
                else if (input[i] == BamlConst.ChildEnd) 
                { 
                    if (  i > 0
                       && input[i - 1] != BamlConst.EscapeChar 
                       && inPlaceHolder)
                    {
                        // It is a valid child placeholder end
                        tokens.Add( 
                            new BamlStringToken(
                                BamlStringToken.TokenType.ChildPlaceHolder, 
                                UnescapeString(input.Substring(tokenStart + 1, i - tokenStart - 1)) 
                            )
                        ); 

                        // Advance the token index
                        tokenStart    = i + 1;
                        inPlaceHolder = false; 
                    }
                } 
            } 

            if (inPlaceHolder) 
            {
                // at the end of the string, all child placeholder must be closed
                return null; // error
            } 

            if (tokenStart < input.Length) 
            { 
                tokens.Add(
                    new BamlStringToken( 
                        BamlStringToken.TokenType.Text,
                        UnescapeString(input.Substring(tokenStart))
                        )
                    ); 
            }
 
            return tokens.ToArray(); 
        }
    } 


    internal struct BamlStringToken
    { 
        internal readonly TokenType Type;
        internal readonly string    Value; 
 
        internal BamlStringToken(TokenType type, string value)
        { 
            Type  = type;
            Value = value;
        }
 
        internal enum TokenType
        { 
            Text, 
            ChildPlaceHolder,
        } 
    }
}


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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BamlResourceContent.cs source code in C# .NET

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