XmlComplianceUtil.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XmlComplianceUtil.cs / 1 / XmlComplianceUtil.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
using System; 
using System.IO;
 
namespace System.Xml {
    using System.Text;

    internal static class XmlComplianceUtil { 

        // Replaces \r\n, \n, \r and \t with single space (0x20) and then removes spaces 
        // at the beggining and and the end of the string and replaces sequences of spaces 
        // with a single space.
        public static string NonCDataNormalize( string value ) { 
            int len = value.Length;
            if ( len <= 0 ) {
               return string.Empty;
            } 

            int startPos = 0; 
            StringBuilder norValue = null; 
            XmlCharType xmlCharType = XmlCharType.Instance;
            while ( xmlCharType.IsWhiteSpace( value[startPos] ) ) { 
                startPos++;
                if ( startPos == len ) {
                    return " ";
                } 
            }
 
            int i = startPos; 
            while ( i < len ) {
                if ( !xmlCharType.IsWhiteSpace( value[i] ) ) { 
                    i++;
                    continue;
                }
 
                int j = i + 1;
                while ( j < len && xmlCharType.IsWhiteSpace( value[j] ) ) { 
                    j++; 
                }
                if ( j == len ) { 
                    if ( norValue == null ) {
                        return value.Substring( startPos, i - startPos );
                    }
                    else { 
                        norValue.Append( value, startPos, i - startPos );
                        return norValue.ToString(); 
                    } 
                }
                if (j > i + 1 || value[i] != 0x20 ) { 
                    if ( norValue == null ) {
                        norValue = new StringBuilder( len );
                    }
                    norValue.Append( value, startPos, i - startPos ); 
                    norValue.Append( (char)0x20 );
                    startPos = j; 
                    i = j; 
                }
                else { 
                    i++;
                }
            }
 
            if ( norValue != null ) {
                if ( startPos < i ) { 
                    norValue.Append( value, startPos, i - startPos ); 
                }
                return norValue.ToString(); 
            }
            else {
                if ( startPos > 0 ) {
                    return value.Substring( startPos, len - startPos ); 
                }
                else { 
                    return value; 
                }
            } 
        }

        // Replaces \r\n, \n, \r and \t with single space (0x20)
        public static string CDataNormalize( string value ) { 
            int len = value.Length;
 
            if ( len <= 0 ) { 
               return string.Empty;
            } 

            int i = 0;
            int startPos = 0;
            StringBuilder norValue = null; 

            while ( i < len ) { 
                char ch = value[i]; 
                if ( ch >= 0x20 || ( ch != 0x9 && ch != 0xA && ch != 0xD ) ) {
                    i++; 
                    continue;
                }

                if ( norValue == null ) { 
                    norValue = new StringBuilder( len );
                } 
                if ( startPos < i ) { 
                    norValue.Append( value, startPos, i - startPos );
                } 
                norValue.Append( (char)0x20 );

                if ( ch == 0xD && ( i+1 < len && value[i+1] == 0xA ) ) {
                    i += 2; 
                }
                else { 
                    i++; 
                }
                startPos = i; 
            }

            if ( norValue == null ) {
                return value; 
            }
            else { 
               if ( i > startPos ) { 
                   norValue.Append(value, startPos, i-startPos);
               } 
               return norValue.ToString();
            }
        }
 
        // StripSpaces removes spaces at the beginning and at the end of the value and replaces sequences of spaces with a single space
        public static string StripSpaces( string value ) { 
            int len = value.Length; 
            if ( len <= 0 ) {
               return string.Empty; 
            }

            int startPos = 0;
            StringBuilder norValue = null; 

            while ( value[startPos] == 0x20 ) { 
                startPos++; 
                if ( startPos == len ) {
                    return " "; 
                }
            }

            int i; 
            for ( i = startPos; i < len; i++ ) {
                if ( value[i] == 0x20 ) { 
                    int j = i + 1; 
                    while ( j < len && value[j] == 0x20 ) {
                        j++; 
                    }
                    if ( j == len ) {
                        if ( norValue == null ) {
                            return value.Substring( startPos, i - startPos ); 
                        }
                        else { 
                            norValue.Append( value, startPos, i - startPos ); 
                            return norValue.ToString();
                        } 
                   }
                   if ( j > i + 1 ) {
                        if ( norValue == null ) {
                            norValue = new StringBuilder( len ); 
                        }
                        norValue.Append( value, startPos, i - startPos + 1 ); 
                        startPos = j; 
                        i = j - 1;
                    } 
                }
            }
            if ( norValue == null ) {
                return ( startPos == 0 ) ? value : value.Substring( startPos, len - startPos ); 
            }
            else { 
                if ( i > startPos ) { 
                   norValue.Append( value, startPos, i - startPos );
               } 
                return norValue.ToString();
            }
        }
 
        // StripSpaces removes spaces at the beginning and at the end of the value and replaces sequences of spaces with a single space
        public static void StripSpaces( char[] value, int index, ref int len ) { 
            if ( len <= 0 ) { 
               return;
            } 

            int startPos = index;
            int endPos = index + len;
 
            while ( value[startPos] == 0x20 ) {
                startPos++; 
                if ( startPos == endPos ) { 
                    len = 1;
                    return; 
                }
            }

            int offset = startPos - index; 
            int i;
            for ( i = startPos; i < endPos; i++ ) { 
                char ch; 
                if ( ( ch = value[i] ) == 0x20 ) {
                    int j = i + 1; 
                    while ( j < endPos && value[j] == 0x20 ) {
                        j++;
                    }
                    if ( j == endPos ) { 
                        offset += ( j - i );
                        break; 
                    } 
                    if ( j > i+1 ) {
                        offset += ( j - i - 1 ); 
                        i = j - 1;
                    }
                }
                value[i-offset] = ch; 
            }
            len -= offset; 
        } 

        public static bool IsValidLanguageID( char[] value, int startPos, int length ) { 
            int len = length;
            if ( len < 2 ) {
                return false;
            } 

            bool fSeenLetter = false; 
            int i = startPos; 
            XmlCharType xmlCharType = XmlCharType.Instance;
 
            char ch = value[i];
            if ( xmlCharType.IsLetter(ch) ) {
                if ( xmlCharType.IsLetter( value[++i] ) ) {
                    if ( len == 2 ) { 
                        return true;
                    } 
                    len--; 
                    i++;
                } 
                else if ( ('I' != ch && 'i' != ch ) && ( 'X' != ch && 'x' != ch ) ) {  //IANA or custom Code
                    return false;
                }
 
                if ( value[i] != '-' ) {
                    return false; 
                } 

                len -= 2; 
                while ( len-- > 0 ) {
                    ch = value[++i];
                    if ( xmlCharType.IsLetter( ch ) ) {
                        fSeenLetter = true; 
                    }
                    else if ( ch == '-' && fSeenLetter ) { 
                        fSeenLetter = false; 
                    }
                    else { 
                        return false;
                    }
                }
                if ( fSeenLetter ) { 
                    return true;
                } 
            } 
            return false;
        } 
    }
}

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

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