Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / Core / XmlCharCheckingWriter.cs / 1 / XmlCharCheckingWriter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- using System; using System.IO; using System.Text; using System.Xml.XPath; using System.Xml.Schema; using System.Collections; using System.Diagnostics; namespace System.Xml { // // XmlCharCheckingWriter // internal class XmlCharCheckingWriter : XmlWrappingWriter { // // Fields // bool checkValues; bool checkNames; bool replaceNewLines; string newLineChars; XmlCharType xmlCharType; // // Constructor // internal XmlCharCheckingWriter( XmlWriter baseWriter, bool checkValues, bool checkNames, bool replaceNewLines, string newLineChars ) : base( baseWriter ) { Debug.Assert( checkValues || replaceNewLines ); this.checkValues = checkValues; this.checkNames = checkNames; this.replaceNewLines = replaceNewLines; this.newLineChars = newLineChars; if ( checkValues ) { xmlCharType = XmlCharType.Instance; } } // // XmlWriter implementation // public override XmlWriterSettings Settings { get { XmlWriterSettings s = base.writer.Settings; if ( s == null ) { s = new XmlWriterSettings(); } else { s = s.Clone(); } if ( checkValues ) { s.CheckCharacters = true; } if ( replaceNewLines ) { s.NewLineHandling = NewLineHandling.Replace; s.NewLineChars = newLineChars; } s.ReadOnly = true; return s; } } public override void WriteDocType( string name, string pubid, string sysid, string subset ) { if ( checkNames ) { ValidateQName( name ); } if ( checkValues ) { if ( pubid != null ) { int i; if ( ( i = xmlCharType.IsPublicId( pubid ) ) >= 0 ) { throw XmlConvert.CreateInvalidCharException( pubid[i] ); } } if ( sysid != null ) { CheckCharacters( sysid ); } if ( subset != null ) { CheckCharacters( subset ); } } if ( replaceNewLines ) { sysid = ReplaceNewLines( sysid ); pubid = ReplaceNewLines( pubid ); subset = ReplaceNewLines( subset ); } writer.WriteDocType( name, pubid, sysid, subset ); } public override void WriteStartElement( string prefix, string localName, string ns ) { if ( checkNames ) { if ( localName == null || localName.Length == 0 ) { throw new ArgumentException( Res.GetString( Res.Xml_EmptyLocalName ) ); } ValidateNCName( localName ); if ( prefix != null && prefix.Length > 0 ) { ValidateNCName( prefix ); } } writer.WriteStartElement( prefix, localName, ns ); } public override void WriteStartAttribute( string prefix, string localName, string ns ) { if ( checkNames ) { if ( localName == null || localName.Length == 0 ) { throw new ArgumentException( Res.GetString( Res.Xml_EmptyLocalName ) ); } ValidateNCName( localName ); if ( prefix != null && prefix.Length > 0 ) { ValidateNCName( prefix ); } } writer.WriteStartAttribute( prefix, localName, ns ); } public override void WriteCData( string text ) { if ( text != null ) { if ( checkValues ) { CheckCharacters( text ); } if ( replaceNewLines ) { text = ReplaceNewLines( text ); } int i; while ( ( i = text.IndexOf( "]]>", StringComparison.Ordinal ) ) >= 0 ) { writer.WriteCData( text.Substring( 0, i + 2 ) ); text = text.Substring( i + 2 ); } } writer.WriteCData( text ); } public override void WriteComment( string text ) { if ( text != null ) { if ( checkValues ) { CheckCharacters( text ); text = InterleaveInvalidChars( text, '-', '-' ); } if ( replaceNewLines ) { text = ReplaceNewLines( text ); } } writer.WriteComment( text ); } public override void WriteProcessingInstruction( string name, string text ) { if ( checkNames ) { ValidateNCName( name ); } if ( text != null ) { if ( checkValues ) { CheckCharacters( text ); text = InterleaveInvalidChars( text, '?', '>' ); } if ( replaceNewLines ) { text = ReplaceNewLines( text ); } } writer.WriteProcessingInstruction( name, text ); } public override void WriteEntityRef( string name ) { if ( checkNames ) { ValidateQName( name ); } writer.WriteEntityRef( name ); } public override void WriteWhitespace( string ws ) { // "checkNames" is intentional here; if false, the whitespaces are checked in XmlWellformedWriter if ( checkNames ) { int i; if ( ( i = xmlCharType.IsOnlyWhitespaceWithPos( ws ) ) != -1 ) { throw new ArgumentException( Res.GetString( Res.Xml_InvalidWhitespaceCharacter, XmlException.BuildCharExceptionStr( ws[i] ) ) ); } } writer.WriteWhitespace( ws ); } public override void WriteString( string text ) { if ( text != null ) { if ( checkValues ) { CheckCharacters( text ); } if ( replaceNewLines && WriteState != WriteState.Attribute ) { text = ReplaceNewLines( text ); } } writer.WriteString( text ); } public override void WriteSurrogateCharEntity( char lowChar, char highChar ) { writer.WriteSurrogateCharEntity( lowChar, highChar ); } public override void WriteChars( char[] buffer, int index, int count ) { if ( checkValues ) { CheckCharacters( buffer, index, count ); } if ( replaceNewLines && WriteState != WriteState.Attribute ) { string text = ReplaceNewLines( buffer, index, count ); if ( text != null ) { WriteString( text ); return; } } writer.WriteChars( buffer, index, count ); } public override void WriteNmToken( string name ) { if ( checkNames ) { if ( name == null || name.Length == 0 ) { throw new ArgumentException( Res.GetString( Res.Xml_EmptyName ) ); } XmlConvert.VerifyNMTOKEN( name ); } writer.WriteNmToken( name ); } public override void WriteName( string name ) { if ( checkNames ) { XmlConvert.VerifyQName( name ); } writer.WriteName( name ); } public override void WriteQualifiedName( string localName, string ns ) { if ( checkNames ) { ValidateNCName( localName ); } writer.WriteQualifiedName( localName, ns ); } // // Private methods // private void CheckCharacters( string str ) { XmlConvert.VerifyCharData( str, ExceptionType.ArgumentException ); } private void CheckCharacters( char[] data, int offset, int len ) { XmlConvert.VerifyCharData( data, offset, len, ExceptionType.ArgumentException ); } private void ValidateNCName( string ncname ) { if ( ncname.Length == 0 ) { throw new ArgumentException( Res.GetString( Res.Xml_EmptyName ) ); } int len = ValidateNames.ParseNCName( ncname, 0 ); if ( len != ncname.Length ) { throw new ArgumentException( Res.GetString( len == 0 ? Res.Xml_BadStartNameChar : Res.Xml_BadNameChar, XmlException.BuildCharExceptionStr( ncname[len] ) ) ); } } private void ValidateQName( string name ) { if ( name.Length == 0 ) { throw new ArgumentException( Res.GetString( Res.Xml_EmptyName ) ); } int colonPos; int len = ValidateNames.ParseQName( name, 0, out colonPos ); if ( len != name.Length ) { string res = ( len == 0 || ( colonPos > -1 && len == colonPos + 1 ) ) ? Res.Xml_BadStartNameChar : Res.Xml_BadNameChar; throw new ArgumentException( Res.GetString( res, XmlException.BuildCharExceptionStr( name[len] ) ) ); } } private string ReplaceNewLines( string str ) { if ( str == null ) { return null; } StringBuilder sb = null; int start = 0; int i; for ( i = 0; i < str.Length; i++ ) { char ch; if ( ( ch = str[i] ) >= 0x20 ) { continue; } if ( ch == '\n' ) { if ( newLineChars == "\n" ) { continue; } if ( sb == null ) { sb = new StringBuilder( str.Length + 5 ); } sb.Append( str, start, i - start ); } else if ( ch == '\r' ) { if ( i + 1 < str.Length && str[i+1] == '\n' ) { if ( newLineChars == "\r\n" ) { i++; continue; } if ( sb == null ) { sb = new StringBuilder( str.Length + 5 ); } sb.Append( str, start, i - start ); i++; } else { if ( newLineChars == "\r" ) { continue; } if ( sb == null ) { sb = new StringBuilder( str.Length + 5 ); } sb.Append( str, start, i - start ); } } else { continue; } sb.Append( newLineChars ); start = i + 1; } if ( sb == null ) { return str; } else { sb.Append( str, start, i - start ); return sb.ToString(); } } private string ReplaceNewLines( char[] data, int offset, int len ) { if ( data == null ) { return null; } StringBuilder sb = null; int start = offset; int endPos = offset + len; int i; for ( i = offset; i < endPos; i++ ) { char ch; if ( ( ch = data[i] ) >= 0x20 ) { continue; } if ( ch == '\n' ) { if ( newLineChars == "\n" ) { continue; } if ( sb == null ) { sb = new StringBuilder( len + 5 ); } sb.Append( data, start, i - start ); } else if ( ch == '\r' ) { if ( i + 1 < endPos && data[i+1] == '\n' ) { if ( newLineChars == "\r\n" ) { continue; } if ( sb == null ) { sb = new StringBuilder( len + 5 ); } sb.Append( data, start, i - start ); i++; } else { if ( newLineChars == "\r" ) { continue; } if ( sb == null ) { sb = new StringBuilder( len + 5 ); } sb.Append( data, start, i - start ); } } else { continue; } sb.Append( newLineChars ); start = i + 1; } if ( sb == null ) { return null; } else { sb.Append( data, start, i - start ); return sb.ToString(); } } // interleave 2 adjacent invalid chars with a space, e.g. change "--" to "- -" private string InterleaveInvalidChars( string text, char invChar1, char invChar2 ) { StringBuilder sb = null; int start = 0; int i; for ( i = 0; i < text.Length; i++ ) { if ( text[i] != invChar2 ) { continue; } if ( i > 0 && text[i-1] == invChar1 ) { if ( sb == null ) { sb = new StringBuilder( text.Length + 5 ); } sb.Append( text, start, i - start ); sb.Append( ' ' ); start = i; } } // check last char & return if ( sb == null ) { return ( i == 0 || text[i-1] != invChar1 ) ? text : ( text + ' ' ); } else { sb.Append( text, start, i - start ); if ( i > 0 && text[i-1] == invChar1 ) { sb.Append( ' ' ); } return sb.ToString(); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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