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XmlTextWriter.cs
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XmlTextWriter.cs
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//------------------------------------------------------------------------------
// <copyright file="XmlTextWriter.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">[....]</owner>
//------------------------------------------------------------------------------
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Diagnostics;
using System.Globalization;
using System.Runtime.Versioning;
namespace System.Xml {
// Specifies formatting options for XmlTextWriter.
public enum Formatting {
// No special formatting is done (this is the default).
None,
//This option causes child elements to be indented using the Indentation and IndentChar properties.
// It only indents Element Content (http://www.w3.org/TR/1998/REC-xml-19980210#sec-element-content)
// and not Mixed Content (http://www.w3.org/TR/1998/REC-xml-19980210#sec-mixed-content)
// according to the XML 1.0 definitions of these terms.
Indented,
};
// Represents a writer that provides fast non-cached forward-only way of generating XML streams
// containing XML documents that conform to the W3CExtensible Markup Language (XML) 1.0 specification
// and the Namespaces in XML specification.
[System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Never)]
public class XmlTextWriter : XmlWriter {
//
// Private types
//
enum NamespaceState {
Uninitialized,
NotDeclaredButInScope,
DeclaredButNotWrittenOut,
DeclaredAndWrittenOut
}
struct TagInfo {
internal string name;
internal string prefix;
internal string defaultNs;
internal NamespaceState defaultNsState;
internal XmlSpace xmlSpace;
internal string xmlLang;
internal int prevNsTop;
internal int prefixCount;
internal bool mixed; // whether to pretty print the contents of this element.
internal void Init( int nsTop ) {
name = null;
defaultNs = String.Empty;
defaultNsState = NamespaceState.Uninitialized;
xmlSpace = XmlSpace.None;
xmlLang = null;
prevNsTop = nsTop;
prefixCount = 0;
mixed = false;
}
}
struct Namespace {
internal string prefix;
internal string ns;
internal bool declared;
internal int prevNsIndex;
internal void Set( string prefix, string ns, bool declared ) {
this.prefix = prefix;
this.ns = ns;
this.declared = declared;
this.prevNsIndex = -1;
}
}
enum SpecialAttr {
None,
XmlSpace,
XmlLang,
XmlNs
};
// State machine is working through autocomplete
private enum State {
Start,
Prolog,
PostDTD,
Element,
Attribute,
Content,
AttrOnly,
Epilog,
Error,
Closed,
}
private enum Token {
PI,
Doctype,
Comment,
CData,
StartElement,
EndElement,
LongEndElement,
StartAttribute,
EndAttribute,
Content,
Base64,
RawData,
Whitespace,
Empty
}
//
// Fields
//
// output
TextWriter textWriter;
XmlTextEncoder xmlEncoder;
Encoding encoding;
// formatting
Formatting formatting;
bool indented; // perf - faster to check a boolean.
int indentation;
char indentChar;
// element stack
TagInfo[] stack;
int top;
// state machine for AutoComplete
State[] stateTable;
State currentState;
Token lastToken;
// Base64 content
XmlTextWriterBase64Encoder base64Encoder;
// misc
char quoteChar;
char curQuoteChar;
bool namespaces;
SpecialAttr specialAttr;
string prefixForXmlNs;
bool flush;
// namespaces
Namespace[] nsStack;
int nsTop;
Dictionary<string, int> nsHashtable;
bool useNsHashtable;
// char types
XmlCharType xmlCharType = XmlCharType.Instance;
//
// Constants and constant tables
//
const int NamespaceStackInitialSize = 8;
#if DEBUG
const int MaxNamespacesWalkCount = 3;
#else
const int MaxNamespacesWalkCount = 16;
#endif
static string[] stateName = {
"Start",
"Prolog",
"PostDTD",
"Element",
"Attribute",
"Content",
"AttrOnly",
"Epilog",
"Error",
"Closed",
};
static string[] tokenName = {
"PI",
"Doctype",
"Comment",
"CData",
"StartElement",
"EndElement",
"LongEndElement",
"StartAttribute",
"EndAttribute",
"Content",
"Base64",
"RawData",
"Whitespace",
"Empty"
};
static readonly State[] stateTableDefault = {
// State.Start State.Prolog State.PostDTD State.Element State.Attribute State.Content State.AttrOnly State.Epilog
//
/* Token.PI */ State.Prolog, State.Prolog, State.PostDTD, State.Content, State.Content, State.Content, State.Error, State.Epilog,
/* Token.Doctype */ State.PostDTD, State.PostDTD, State.Error, State.Error, State.Error, State.Error, State.Error, State.Error,
/* Token.Comment */ State.Prolog, State.Prolog, State.PostDTD, State.Content, State.Content, State.Content, State.Error, State.Epilog,
/* Token.CData */ State.Content, State.Content, State.Error, State.Content, State.Content, State.Content, State.Error, State.Epilog,
/* Token.StartElement */ State.Element, State.Element, State.Element, State.Element, State.Element, State.Element, State.Error, State.Element,
/* Token.EndElement */ State.Error, State.Error, State.Error, State.Content, State.Content, State.Content, State.Error, State.Error,
/* Token.LongEndElement */ State.Error, State.Error, State.Error, State.Content, State.Content, State.Content, State.Error, State.Error,
/* Token.StartAttribute */ State.AttrOnly, State.Error, State.Error, State.Attribute, State.Attribute, State.Error, State.Error, State.Error,
/* Token.EndAttribute */ State.Error, State.Error, State.Error, State.Error, State.Element, State.Error, State.Epilog, State.Error,
/* Token.Content */ State.Content, State.Content, State.Error, State.Content, State.Attribute, State.Content, State.Attribute, State.Epilog,
/* Token.Base64 */ State.Content, State.Content, State.Error, State.Content, State.Attribute, State.Content, State.Attribute, State.Epilog,
/* Token.RawData */ State.Prolog, State.Prolog, State.PostDTD, State.Content, State.Attribute, State.Content, State.Attribute, State.Epilog,
/* Token.Whitespace */ State.Prolog, State.Prolog, State.PostDTD, State.Content, State.Attribute, State.Content, State.Attribute, State.Epilog,
};
static readonly State[] stateTableDocument = {
// State.Start State.Prolog State.PostDTD State.Element State.Attribute State.Content State.AttrOnly State.Epilog
//
/* Token.PI */ State.Error, State.Prolog, State.PostDTD, State.Content, State.Content, State.Content, State.Error, State.Epilog,
/* Token.Doctype */ State.Error, State.PostDTD, State.Error, State.Error, State.Error, State.Error, State.Error, State.Error,
/* Token.Comment */ State.Error, State.Prolog, State.PostDTD, State.Content, State.Content, State.Content, State.Error, State.Epilog,
/* Token.CData */ State.Error, State.Error, State.Error, State.Content, State.Content, State.Content, State.Error, State.Error,
/* Token.StartElement */ State.Error, State.Element, State.Element, State.Element, State.Element, State.Element, State.Error, State.Error,
/* Token.EndElement */ State.Error, State.Error, State.Error, State.Content, State.Content, State.Content, State.Error, State.Error,
/* Token.LongEndElement */ State.Error, State.Error, State.Error, State.Content, State.Content, State.Content, State.Error, State.Error,
/* Token.StartAttribute */ State.Error, State.Error, State.Error, State.Attribute, State.Attribute, State.Error, State.Error, State.Error,
/* Token.EndAttribute */ State.Error, State.Error, State.Error, State.Error, State.Element, State.Error, State.Error, State.Error,
/* Token.Content */ State.Error, State.Error, State.Error, State.Content, State.Attribute, State.Content, State.Error, State.Error,
/* Token.Base64 */ State.Error, State.Error, State.Error, State.Content, State.Attribute, State.Content, State.Error, State.Error,
/* Token.RawData */ State.Error, State.Prolog, State.PostDTD, State.Content, State.Attribute, State.Content, State.Error, State.Epilog,
/* Token.Whitespace */ State.Error, State.Prolog, State.PostDTD, State.Content, State.Attribute, State.Content, State.Error, State.Epilog,
};
//
// Constructors
//
internal XmlTextWriter() {
namespaces = true;
formatting = Formatting.None;
indentation = 2;
indentChar = ' ';
// namespaces
nsStack = new Namespace[NamespaceStackInitialSize];
nsTop = -1;
// element stack
stack = new TagInfo[10];
top = 0;// 0 is an empty sentanial element
stack[top].Init( -1 );
quoteChar = '"';
stateTable = stateTableDefault;
currentState = State.Start;
lastToken = Token.Empty;
}
// Creates an instance of the XmlTextWriter class using the specified stream.
public XmlTextWriter(Stream w, Encoding encoding) : this() {
this.encoding = encoding;
if (encoding != null)
textWriter = new StreamWriter(w, encoding);
else
textWriter = new StreamWriter(w);
xmlEncoder = new XmlTextEncoder(textWriter);
xmlEncoder.QuoteChar = this.quoteChar;
}
// Creates an instance of the XmlTextWriter class using the specified file.
[ResourceConsumption(ResourceScope.Machine)]
[ResourceExposure(ResourceScope.Machine)]
public XmlTextWriter(String filename, Encoding encoding)
: this(new FileStream(filename, FileMode.Create,
FileAccess.Write, FileShare.Read), encoding) {
}
// Creates an instance of the XmlTextWriter class using the specified TextWriter.
public XmlTextWriter(TextWriter w) : this() {
textWriter = w;
encoding = w.Encoding;
xmlEncoder = new XmlTextEncoder(w);
xmlEncoder.QuoteChar = this.quoteChar;
}
//
// XmlTextWriter properties
//
// Gets the XmlTextWriter base stream.
public Stream BaseStream {
get {
StreamWriter streamWriter = textWriter as StreamWriter;
return (streamWriter == null ? null : streamWriter.BaseStream);
}
}
// Gets or sets a value indicating whether to do namespace support.
public bool Namespaces {
get { return this.namespaces;}
set {
if (this.currentState != State.Start)
throw new InvalidOperationException(Res.GetString(Res.Xml_NotInWriteState));
this.namespaces = value;
}
}
// Indicates how the output is formatted.
public Formatting Formatting {
get { return this.formatting;}
set { this.formatting = value; this.indented = value == Formatting.Indented;}
}
// Gets or sets how many IndentChars to write for each level in the hierarchy when Formatting is set to "Indented".
public int Indentation {
get { return this.indentation;}
set {
if (value < 0)
throw new ArgumentException(Res.GetString(Res.Xml_InvalidIndentation));
this.indentation = value;
}
}
// Gets or sets which character to use for indenting when Formatting is set to "Indented".
public char IndentChar {
get { return this.indentChar;}
set { this.indentChar = value;}
}
// Gets or sets which character to use to quote attribute values.
public char QuoteChar {
get { return this.quoteChar;}
set {
if (value != '"' && value != '\'') {
throw new ArgumentException(Res.GetString(Res.Xml_InvalidQuote));
}
this.quoteChar = value;
this.xmlEncoder.QuoteChar = value;
}
}
//
// XmlWriter implementation
//
// Writes out the XML declaration with the version "1.0".
public override void WriteStartDocument() {
StartDocument(-1);
}
// Writes out the XML declaration with the version "1.0" and the standalone attribute.
public override void WriteStartDocument(bool standalone) {
StartDocument(standalone ? 1 : 0);
}
// Closes any open elements or attributes and puts the writer back in the Start state.
public override void WriteEndDocument() {
try {
AutoCompleteAll();
if (this.currentState != State.Epilog) {
if (this.currentState == State.Closed) {
throw new ArgumentException(Res.GetString(Res.Xml_ClosedOrError));
}
else {
throw new ArgumentException(Res.GetString(Res.Xml_NoRoot));
}
}
this.stateTable = stateTableDefault;
this.currentState = State.Start;
this.lastToken = Token.Empty;
}
catch {
currentState = State.Error;
throw;
}
}
// Writes out the DOCTYPE declaration with the specified name and optional attributes.
public override void WriteDocType(string name, string pubid, string sysid, string subset) {
try {
ValidateName(name, false);
AutoComplete(Token.Doctype);
textWriter.Write("<!DOCTYPE ");
textWriter.Write(name);
if (pubid != null) {
textWriter.Write(" PUBLIC " + quoteChar);
textWriter.Write(pubid);
textWriter.Write(quoteChar + " " + quoteChar);
textWriter.Write(sysid);
textWriter.Write(quoteChar);
}
else if (sysid != null) {
textWriter.Write(" SYSTEM " + quoteChar);
textWriter.Write(sysid);
textWriter.Write(quoteChar);
}
if (subset != null) {
textWriter.Write("[");
textWriter.Write(subset);
textWriter.Write("]");
}
textWriter.Write('>');
}
catch {
currentState = State.Error;
throw;
}
}
// Writes out the specified start tag and associates it with the given namespace and prefix.
public override void WriteStartElement(string prefix, string localName, string ns) {
try {
AutoComplete(Token.StartElement);
PushStack();
textWriter.Write('<');
if (this.namespaces) {
// Propagate default namespace and mix model down the stack.
stack[top].defaultNs = stack[top-1].defaultNs;
if (stack[top-1].defaultNsState != NamespaceState.Uninitialized)
stack[top].defaultNsState = NamespaceState.NotDeclaredButInScope;
stack[top].mixed = stack[top-1].mixed;
if (ns == null) {
// use defined prefix
if (prefix != null && prefix.Length != 0 && (LookupNamespace(prefix) == -1)) {
throw new ArgumentException(Res.GetString(Res.Xml_UndefPrefix));
}
}
else {
if (prefix == null) {
string definedPrefix = FindPrefix(ns);
if (definedPrefix != null) {
prefix = definedPrefix;
}
else {
PushNamespace(null, ns, false); // new default
}
}
else if (prefix.Length == 0) {
PushNamespace(null, ns, false); // new default
}
else {
if (ns.Length == 0) {
prefix = null;
}
VerifyPrefixXml(prefix, ns);
PushNamespace(prefix, ns, false); // define
}
}
stack[top].prefix = null;
if (prefix != null && prefix.Length != 0) {
stack[top].prefix = prefix;
textWriter.Write(prefix);
textWriter.Write(':');
}
}
else {
if ((ns != null && ns.Length != 0) || (prefix != null && prefix.Length != 0)) {
throw new ArgumentException(Res.GetString(Res.Xml_NoNamespaces));
}
}
stack[top].name = localName;
textWriter.Write(localName);
}
catch {
currentState = State.Error;
throw;
}
}
// Closes one element and pops the corresponding namespace scope.
public override void WriteEndElement() {
InternalWriteEndElement(false);
}
// Closes one element and pops the corresponding namespace scope.
public override void WriteFullEndElement() {
InternalWriteEndElement(true);
}
// Writes the start of an attribute.
public override void WriteStartAttribute(string prefix, string localName, string ns) {
try {
AutoComplete(Token.StartAttribute);
this.specialAttr = SpecialAttr.None;
if (this.namespaces) {
if (prefix != null && prefix.Length == 0) {
prefix = null;
}
if (ns == XmlReservedNs.NsXmlNs && prefix == null && localName != "xmlns") {
prefix = "xmlns";
}
if (prefix == "xml") {
if (localName == "lang") {
this.specialAttr = SpecialAttr.XmlLang;
}
else if (localName == "space") {
this.specialAttr = SpecialAttr.XmlSpace;
}
/* bug54408. to be fwd compatible we need to treat xml prefix as reserved
and not really insist on a specific value. Who knows in the future it
might be OK to say xml:blabla
else {
throw new ArgumentException(Res.GetString(Res.Xml_InvalidPrefix));
}*/
}
else if (prefix == "xmlns") {
if (XmlReservedNs.NsXmlNs != ns && ns != null) {
throw new ArgumentException(Res.GetString(Res.Xml_XmlnsBelongsToReservedNs));
}
if (localName == null || localName.Length == 0) {
localName = prefix;
prefix = null;
this.prefixForXmlNs = null;
}
else {
this.prefixForXmlNs = localName;
}
this.specialAttr = SpecialAttr.XmlNs;
}
else if (prefix == null && localName == "xmlns") {
if (XmlReservedNs.NsXmlNs != ns && ns != null) {
// add the below line back in when DOM is fixed
throw new ArgumentException(Res.GetString(Res.Xml_XmlnsBelongsToReservedNs));
}
this.specialAttr = SpecialAttr.XmlNs;
this.prefixForXmlNs = null;
}
else {
if (ns == null) {
// use defined prefix
if (prefix != null && (LookupNamespace(prefix) == -1)) {
throw new ArgumentException(Res.GetString(Res.Xml_UndefPrefix));
}
}
else if (ns.Length == 0) {
// empty namespace require null prefix
prefix = string.Empty;
}
else { // ns.Length != 0
VerifyPrefixXml(prefix, ns);
if (prefix != null && LookupNamespaceInCurrentScope(prefix) != -1) {
prefix = null;
}
// Now verify prefix validity
string definedPrefix = FindPrefix(ns);
if (definedPrefix != null && (prefix == null || prefix == definedPrefix)) {
prefix = definedPrefix;
}
else {
if (prefix == null) {
prefix = GeneratePrefix(); // need a prefix if
}
PushNamespace(prefix, ns, false);
}
}
}
if (prefix != null && prefix.Length != 0) {
textWriter.Write(prefix);
textWriter.Write(':');
}
}
else {
if ((ns != null && ns.Length != 0) || (prefix != null && prefix.Length != 0)) {
throw new ArgumentException(Res.GetString(Res.Xml_NoNamespaces));
}
if (localName == "xml:lang") {
this.specialAttr = SpecialAttr.XmlLang;
}
else if (localName == "xml:space") {
this.specialAttr = SpecialAttr.XmlSpace;
}
}
xmlEncoder.StartAttribute(this.specialAttr != SpecialAttr.None);
textWriter.Write(localName);
textWriter.Write('=');
if (this.curQuoteChar != this.quoteChar) {
this.curQuoteChar = this.quoteChar;
xmlEncoder.QuoteChar = this.quoteChar;
}
textWriter.Write(this.curQuoteChar);
}
catch {
currentState = State.Error;
throw;
}
}
// Closes the attribute opened by WriteStartAttribute.
public override void WriteEndAttribute() {
try {
AutoComplete(Token.EndAttribute);
}
catch {
currentState = State.Error;
throw;
}
}
// Writes out a <![CDATA[...]]> block containing the specified text.
public override void WriteCData(string text) {
try {
AutoComplete(Token.CData);
if (null != text && text.IndexOf("]]>", StringComparison.Ordinal) >= 0) {
throw new ArgumentException(Res.GetString(Res.Xml_InvalidCDataChars));
}
textWriter.Write("<![CDATA[");
if (null != text) {
xmlEncoder.WriteRawWithSurrogateChecking(text);
}
textWriter.Write("]]>");
}
catch {
currentState = State.Error;
throw;
}
}
// Writes out a comment <!--...--> containing the specified text.
public override void WriteComment(string text) {
try {
if (null != text && (text.IndexOf("--", StringComparison.Ordinal)>=0 || (text.Length != 0 && text[text.Length-1] == '-'))) {
throw new ArgumentException(Res.GetString(Res.Xml_InvalidCommentChars));
}
AutoComplete(Token.Comment);
textWriter.Write("<!--");
if (null != text) {
xmlEncoder.WriteRawWithSurrogateChecking(text);
}
textWriter.Write("-->");
}
catch {
currentState = State.Error;
throw;
}
}
// Writes out a processing instruction with a space between the name and text as follows: <?name text?>
public override void WriteProcessingInstruction(string name, string text) {
try {
if (null != text && text.IndexOf("?>", StringComparison.Ordinal)>=0) {
throw new ArgumentException(Res.GetString(Res.Xml_InvalidPiChars));
}
if (0 == String.Compare(name, "xml", StringComparison.OrdinalIgnoreCase) && this.stateTable == stateTableDocument) {
throw new ArgumentException(Res.GetString(Res.Xml_DupXmlDecl));
}
AutoComplete(Token.PI);
InternalWriteProcessingInstruction(name, text);
}
catch {
currentState = State.Error;
throw;
}
}
// Writes out an entity reference as follows: "&"+name+";".
public override void WriteEntityRef(string name) {
try {
ValidateName(name, false);
AutoComplete(Token.Content);
xmlEncoder.WriteEntityRef(name);
}
catch {
currentState = State.Error;
throw;
}
}
// Forces the generation of a character entity for the specified Unicode character value.
public override void WriteCharEntity(char ch) {
try {
AutoComplete(Token.Content);
xmlEncoder.WriteCharEntity(ch);
}
catch {
currentState = State.Error;
throw;
}
}
// Writes out the given whitespace.
public override void WriteWhitespace(string ws) {
try {
if (null == ws) {
ws = String.Empty;
}
if (!xmlCharType.IsOnlyWhitespace(ws)) {
throw new ArgumentException(Res.GetString(Res.Xml_NonWhitespace));
}
AutoComplete(Token.Whitespace);
xmlEncoder.Write(ws);
}
catch {
currentState = State.Error;
throw;
}
}
// Writes out the specified text content.
public override void WriteString(string text) {
try {
if (null != text && text.Length != 0 ) {
AutoComplete(Token.Content);
xmlEncoder.Write(text);
}
}
catch {
currentState = State.Error;
throw;
}
}
// Writes out the specified surrogate pair as a character entity.
public override void WriteSurrogateCharEntity(char lowChar, char highChar){
try {
AutoComplete(Token.Content);
xmlEncoder.WriteSurrogateCharEntity(lowChar, highChar);
}
catch {
currentState = State.Error;
throw;
}
}
// Writes out the specified text content.
public override void WriteChars(Char[] buffer, int index, int count) {
try {
AutoComplete(Token.Content);
xmlEncoder.Write(buffer, index, count);
}
catch {
currentState = State.Error;
throw;
}
}
// Writes raw markup from the specified character buffer.
public override void WriteRaw(Char[] buffer, int index, int count) {
try {
AutoComplete(Token.RawData);
xmlEncoder.WriteRaw(buffer, index, count);
}
catch {
currentState = State.Error;
throw;
}
}
// Writes raw markup from the specified character string.
public override void WriteRaw(String data) {
try {
AutoComplete(Token.RawData);
xmlEncoder.WriteRawWithSurrogateChecking(data);
}
catch {
currentState = State.Error;
throw;
}
}
// Encodes the specified binary bytes as base64 and writes out the resulting text.
public override void WriteBase64(byte[] buffer, int index, int count) {
try {
if (!this.flush) {
AutoComplete(Token.Base64);
}
this.flush = true;
// No need for us to explicitly validate the args. The StreamWriter will do
// it for us.
if (null == this.base64Encoder) {
this.base64Encoder = new XmlTextWriterBase64Encoder( xmlEncoder );
}
// Encode will call WriteRaw to write out the encoded characters
this.base64Encoder.Encode( buffer, index, count );
}
catch {
currentState = State.Error;
throw;
}
}
// Encodes the specified binary bytes as binhex and writes out the resulting text.
public override void WriteBinHex( byte[] buffer, int index, int count ) {
try {
AutoComplete( Token.Content );
BinHexEncoder.Encode( buffer, index, count, this );
}
catch {
currentState = State.Error;
throw;
}
}
// Returns the state of the XmlWriter.
public override WriteState WriteState {
get {
switch (this.currentState) {
case State.Start :
return WriteState.Start;
case State.Prolog :
case State.PostDTD :
return WriteState.Prolog;
case State.Element :
return WriteState.Element;
case State.Attribute :
case State.AttrOnly:
return WriteState.Attribute;
case State.Content :
case State.Epilog :
return WriteState.Content;
case State.Error:
return WriteState.Error;
case State.Closed:
return WriteState.Closed;
default:
Debug.Assert( false );
return WriteState.Error;
}
}
}
// Closes the XmlWriter and the underlying stream/TextWriter.
public override void Close() {
try {
AutoCompleteAll();
}
catch { // never fail
}
finally {
this.currentState = State.Closed;
textWriter.Close();
}
}
// Flushes whatever is in the buffer to the underlying stream/TextWriter and flushes the underlying stream/TextWriter.
public override void Flush() {
textWriter.Flush();
}
// Writes out the specified name, ensuring it is a valid Name according to the XML specification
// (http://www.w3.org/TR/1998/REC-xml-19980210#NT-Name
public override void WriteName(string name) {
try {
AutoComplete(Token.Content);
InternalWriteName(name, false);
}
catch {
currentState = State.Error;
throw;
}
}
// Writes out the specified namespace-qualified name by looking up the prefix that is in scope for the given namespace.
public override void WriteQualifiedName(string localName, string ns) {
try {
AutoComplete(Token.Content);
if (this.namespaces) {
if (ns != null && ns.Length != 0 && ns != stack[top].defaultNs) {
string prefix = FindPrefix(ns);
if (prefix == null) {
if (this.currentState != State.Attribute) {
throw new ArgumentException(Res.GetString(Res.Xml_UndefNamespace, ns));
}
prefix = GeneratePrefix(); // need a prefix if
PushNamespace(prefix, ns, false);
}
if (prefix.Length != 0) {
InternalWriteName(prefix, true);
textWriter.Write(':');
}
}
}
else if (ns != null && ns.Length != 0) {
throw new ArgumentException(Res.GetString(Res.Xml_NoNamespaces));
}
InternalWriteName(localName, true);
}
catch {
currentState = State.Error;
throw;
}
}
// Returns the closest prefix defined in the current namespace scope for the specified namespace URI.
public override string LookupPrefix(string ns) {
if (ns == null || ns.Length == 0) {
throw new ArgumentException(Res.GetString(Res.Xml_EmptyName));
}
string s = FindPrefix(ns);
if (s == null && ns == stack[top].defaultNs) {
s = string.Empty;
}
return s;
}
// Gets an XmlSpace representing the current xml:space scope.
public override XmlSpace XmlSpace {
get {
for (int i = top; i > 0; i--) {
XmlSpace xs = stack[i].xmlSpace;
if (xs != XmlSpace.None)
return xs;
}
return XmlSpace.None;
}
}
// Gets the current xml:lang scope.
public override string XmlLang {
get {
for (int i = top; i > 0; i--) {
String xlang = stack[i].xmlLang;
if (xlang != null)
return xlang;
}
return null;
}
}
// Writes out the specified name, ensuring it is a valid NmToken
// according to the XML specification (http://www.w3.org/TR/1998/REC-xml-19980210#NT-Name).
public override void WriteNmToken(string name) {
try {
AutoComplete(Token.Content);
if (name == null || name.Length == 0) {
throw new ArgumentException(Res.GetString(Res.Xml_EmptyName));
}
if (!ValidateNames.IsNmtokenNoNamespaces(name)) {
throw new ArgumentException(Res.GetString(Res.Xml_InvalidNameChars, name));
}
textWriter.Write(name);
}
catch {
currentState = State.Error;
throw;
}
}
//
// Private implementation methods
//
void StartDocument(int standalone) {
try {
if (this.currentState != State.Start) {
throw new InvalidOperationException(Res.GetString(Res.Xml_NotTheFirst));
}
this.stateTable = stateTableDocument;
this.currentState = State.Prolog;
StringBuilder bufBld = new StringBuilder(128);
bufBld.Append("version=" + quoteChar + "1.0" + quoteChar);
if (this.encoding != null) {
bufBld.Append(" encoding=");
bufBld.Append(quoteChar);
bufBld.Append(this.encoding.WebName);
bufBld.Append(quoteChar);
}
if (standalone >= 0) {
bufBld.Append(" standalone=");
bufBld.Append(quoteChar);
bufBld.Append(standalone == 0 ? "no" : "yes");
bufBld.Append(quoteChar);
}
InternalWriteProcessingInstruction("xml", bufBld.ToString());
}
catch {
currentState = State.Error;
throw;
}
}
void AutoComplete(Token token) {
if (this.currentState == State.Closed) {
throw new InvalidOperationException(Res.GetString(Res.Xml_Closed));
}
else if (this.currentState == State.Error) {
throw new InvalidOperationException(Res.GetString(Res.Xml_WrongToken, tokenName[(int)token], stateName[(int)State.Error]));
}
State newState = this.stateTable[(int)token * 8 + (int)this.currentState];
if (newState == State.Error) {
throw new InvalidOperationException(Res.GetString(Res.Xml_WrongToken, tokenName[(int)token], stateName[(int)this.currentState]));
}