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//
// System.Xml.XmlDeclaration
//
// Author:
// Duncan Mak (duncan@ximian.com)
//
// (C) Ximian, Inc.
using System;
using System.Xml;
using System.Text.RegularExpressions;
namespace System.Xml
{
public class XmlDeclaration : XmlLinkedNode
{
string encoding = "UTF-8"; // defaults to UTF-8
string standalone;
string version;
protected internal XmlDeclaration (string version, string encoding,
string standalone, XmlDocument doc)
: base (doc)
{
if (encoding == null)
encoding = "";
if (standalone == null)
standalone = "";
this.version = version;
this.encoding = encoding;
this.standalone = standalone;
}
public string Encoding {
get { return encoding; }
set { encoding = (value == null) ? String.Empty : value; }
}
public override string InnerText {
get { return Value; }
set { ParseInput (value); }
}
public override string LocalName {
get { return "xml"; }
}
public override string Name {
get { return "xml"; }
}
public override XmlNodeType NodeType {
get { return XmlNodeType.XmlDeclaration; }
}
public string Standalone {
get { return standalone; }
set {
if(value != null)
{
if (value.ToUpper() == "YES")
standalone = "yes";
if (value.ToUpper() == "NO")
standalone = "no";
}
else
standalone = String.Empty;
}
}
public override string Value {
get {
string formatEncoding = "";
string formatStandalone = "";
if (encoding != String.Empty)
formatEncoding = String.Format (" encoding=\"{0}\"", encoding);
if (standalone != String.Empty)
formatStandalone = String.Format (" standalone=\"{0}\"", standalone);
return String.Format ("version=\"{0}\"{1}{2}", Version, formatEncoding, formatStandalone);
}
set { ParseInput (value); }
}
public string Version {
get { return version; }
}
public override XmlNode CloneNode (bool deep)
{
return new XmlDeclaration (Version, Encoding, standalone, OwnerDocument);
}
public override void WriteContentTo (XmlWriter w) {}
public override void WriteTo (XmlWriter w)
{
// This doesn't seem to match up very well with w.WriteStartDocument()
// so writing out custom here.
w.WriteRaw (String.Format ("<?xml {0}?>", Value));
}
void ParseInput (string input)
{
// Encoding = input.Split (new char [] { ' ' }) [1].Split (new char [] { '=' }) [1];
// Standalone = input.Split (new char [] { ' ' }) [2].Split (new char [] { '=' }) [1];
Match m = XmlDeclRegex.Match(input);
if(!m.Success)
throw new XmlException("illegal XML declaration format.");
// Version = m.Result("${ver}");
Encoding = m.Result("${enc}");
Standalone = m.Result("${sta}");
}
// This regular expression matches XMLDecl of XML specification BNF[23]
static Regex xmlDeclRegex;
Regex XmlDeclRegex
{
get
{
if(xmlDeclRegex == null) xmlDeclRegex = new Regex(allMatch, RegexOptions.Compiled);
return xmlDeclRegex;
}
}
// This code makes some loss, but you may understand a bit easily.
const string verMatch = "\\s*version\\s*=\\s*(\\'(?<ver>.*?)\\'|\\\"(?<ver>.*?)\")";
const string encMatch = "\\s*encoding\\s*=\\s*(\\'(?<enc>.*?)\\'|\\\"(?<enc>.*?)\")";
const string staMatch = "\\s*standalone\\s*=\\s*(\\'(?<sta>.*?)\\'|\\\"(?<sta>.*?)\")";
const string allMatch = verMatch + "(" + encMatch + ")?(" + staMatch + ")?";
}
}
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