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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Diagnostics;
using System.Globalization;
using System.Linq;
using Tango.Scripting.Editors.Document;
namespace Tango.Scripting.Editors.Xml
{
/// <summary>
/// Logical grouping of other nodes together.
/// </summary>
public class AXmlElement: AXmlContainer
{
/// <summary> No tags are missing anywhere within this element (recursive) </summary>
public bool IsProperlyNested { get; set; }
/// <returns> True in wellformed XML </returns>
public bool HasStartOrEmptyTag { get; set; }
/// <returns> True in wellformed XML </returns>
public bool HasEndTag { get; set; }
/// <inheritdoc/>
internal override bool UpdateDataFrom(AXmlObject source)
{
if (!base.UpdateDataFrom(source)) return false;
AXmlElement src = (AXmlElement)source;
// Clear the cache for this - quite expensive
attributesAndElements = null;
if (this.IsProperlyNested != src.IsProperlyNested ||
this.HasStartOrEmptyTag != src.HasStartOrEmptyTag ||
this.HasEndTag != src.HasEndTag)
{
OnChanging();
this.IsProperlyNested = src.IsProperlyNested;
this.HasStartOrEmptyTag = src.HasStartOrEmptyTag;
this.HasEndTag = src.HasEndTag;
OnChanged();
return true;
} else {
return false;
}
}
/// <summary> The start or empty-element tag if there is any </summary>
internal AXmlTag StartTag {
get {
Assert(HasStartOrEmptyTag, "Does not have a start tag");
return (AXmlTag)this.Children[0];
}
}
/// <summary> The end tag if there is any </summary>
internal AXmlTag EndTag {
get {
Assert(HasEndTag, "Does not have an end tag");
return (AXmlTag)this.Children[this.Children.Count - 1];
}
}
internal override void DebugCheckConsistency(bool checkParentPointers)
{
DebugAssert(Children.Count > 0, "No children");
base.DebugCheckConsistency(checkParentPointers);
}
#region Helpper methods
/// <summary> Gets attributes of the element </summary>
/// <remarks>
/// Warning: this is a cenvenience method to access the attributes of the start tag.
/// However, since the start tag might be moved/replaced, this property might return
/// different values over time.
/// </remarks>
public AXmlAttributeCollection Attributes {
get {
if (this.HasStartOrEmptyTag) {
return this.StartTag.Attributes;
} else {
return AXmlAttributeCollection.Empty;
}
}
}
ObservableCollection<AXmlObject> attributesAndElements;
/// <summary> Gets both attributes and elements. Expensive, avoid use. </summary>
/// <remarks> Warning: the collection will regenerate after each update </remarks>
public ObservableCollection<AXmlObject> AttributesAndElements {
get {
if (attributesAndElements == null) {
if (this.HasStartOrEmptyTag) {
attributesAndElements = new MergedCollection<AXmlObject, ObservableCollection<AXmlObject>> (
// New wrapper with RawObject types
new FilteredCollection<AXmlObject, AXmlObjectCollection<AXmlObject>>(this.StartTag.Children, x => x is AXmlAttribute),
new FilteredCollection<AXmlObject, AXmlObjectCollection<AXmlObject>>(this.Children, x => x is AXmlElement)
);
} else {
attributesAndElements = new FilteredCollection<AXmlObject, AXmlObjectCollection<AXmlObject>>(this.Children, x => x is AXmlElement);
}
}
return attributesAndElements;
}
}
/// <summary> Name with namespace prefix - exactly as in source </summary>
public string Name {
get {
if (this.HasStartOrEmptyTag) {
return this.StartTag.Name;
} else {
return this.EndTag.Name;
}
}
}
/// <summary> The part of name before ":" </summary>
/// <returns> Empty string if not found </returns>
public string Prefix {
get {
return GetNamespacePrefix(this.Name);
}
}
/// <summary> The part of name after ":" </summary>
/// <returns> Empty string if not found </returns>
public string LocalName {
get {
return GetLocalName(this.Name);
}
}
/// <summary> Resolved namespace of the name </summary>
/// <returns> Empty string if prefix is not found </returns>
public string Namespace {
get {
string prefix = this.Prefix;
if (string.IsNullOrEmpty(prefix)) {
return FindDefaultNamespace();
} else {
return ResolvePrefix(prefix);
}
}
}
/// <summary> Find the defualt namespace for this context </summary>
public string FindDefaultNamespace()
{
AXmlElement current = this;
while(current != null) {
string namesapce = current.GetAttributeValue(NoNamespace, "xmlns");
if (namesapce != null) return namesapce;
current = current.Parent as AXmlElement;
}
return string.Empty; // No namesapce
}
/// <summary>
/// Recursively resolve given prefix in this context. Prefix must have some value.
/// </summary>
/// <returns> Empty string if prefix is not found </returns>
public string ResolvePrefix(string prefix)
{
if (string.IsNullOrEmpty(prefix)) throw new ArgumentException("No prefix given", "prefix");
// Implicit namesapces
if (prefix == "xml") return XmlNamespace;
if (prefix == "xmlns") return XmlnsNamespace;
AXmlElement current = this;
while(current != null) {
string namesapce = current.GetAttributeValue(XmlnsNamespace, prefix);
if (namesapce != null) return namesapce;
current = current.Parent as AXmlElement;
}
return NoNamespace; // Can not find prefix
}
/// <summary>
/// Get unquoted value of attribute.
/// It looks in the no namespace (empty string).
/// </summary>
/// <returns>Null if not found</returns>
public string GetAttributeValue(string localName)
{
return GetAttributeValue(NoNamespace, localName);
}
/// <summary>
/// Get unquoted value of attribute
/// </summary>
/// <param name="namespace">Namespace. Can be no namepace (empty string), which is the default for attributes.</param>
/// <param name="localName">Local name - text after ":"</param>
/// <returns>Null if not found</returns>
public string GetAttributeValue(string @namespace, string localName)
{
@namespace = @namespace ?? string.Empty;
foreach(AXmlAttribute attr in this.Attributes.GetByLocalName(localName)) {
DebugAssert(attr.LocalName == localName, "Bad hashtable");
if (attr.Namespace == @namespace) {
return attr.Value;
}
}
return null;
}
#endregion
/// <inheritdoc/>
public override void AcceptVisitor(IAXmlVisitor visitor)
{
visitor.VisitElement(this);
}
/// <inheritdoc/>
public override string ToString()
{
return string.Format(CultureInfo.InvariantCulture, "[{0} '{1}' Attr:{2} Chld:{3} Nest:{4}]", base.ToString(), this.Name, this.HasStartOrEmptyTag ? this.StartTag.Children.Count : 0, this.Children.Count, this.IsProperlyNested ? "Ok" : "Bad");
}
}
}
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