// Copyright © 2015 The CefSharp Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Linq;
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using System.Text;
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namespace CefSharp
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{
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/// <summary>
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/// Represents a node in the browser's DOM.
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/// </summary>
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public class DomNode : IDomNode
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{
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private readonly IDictionary<string, string> attributes;
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/// <summary>
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/// Constructor.
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/// </summary>
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/// <param name="tagName">Name of the tag.</param>
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/// <param name="attributes">The attributes.</param>
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public DomNode(string tagName, IDictionary<string, string> attributes)
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{
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TagName = tagName;
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this.attributes = attributes;
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}
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/// <summary>
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/// Returns a string that represents the current object.
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/// </summary>
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/// <returns>
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/// A string that represents the current object.
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/// </returns>
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public override string ToString()
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{
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var sb = new StringBuilder();
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if (attributes != null)
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{
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foreach (var pair in attributes)
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{
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sb.AppendFormat("{0}{1}:'{2}'", 0 < sb.Length ? ", " : String.Empty, pair.Key, pair.Value);
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}
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}
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if (!String.IsNullOrWhiteSpace(TagName))
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{
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sb.Insert(0, String.Format("{0} ", TagName));
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}
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if (sb.Length < 1)
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{
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return base.ToString();
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}
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return sb.ToString();
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}
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/// <summary>
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/// Get the value of an attribute.
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/// </summary>
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/// <param name="name">The name of the attribute value to get.</param>
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/// <returns>
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/// The attribute value if the name exists in the DomNode's attributes. Null if the name does not exist.
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/// </returns>
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public string this[string name]
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{
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get
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{
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if (attributes == null || attributes.Count < 1 || !attributes.ContainsKey(name))
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{
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return null;
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}
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return attributes[name];
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}
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}
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/// <summary>
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/// The name of the HTML element.
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/// </summary>
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/// <value>
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/// The name of the tag.
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/// </value>
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public string TagName { get; private set; }
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/// <summary>
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/// Get a read only list of the attribute names.
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/// </summary>
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/// <value>
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/// A list of names of the attributes.
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/// </value>
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public ReadOnlyCollection<string> AttributeNames
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{
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get
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{
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if (attributes == null)
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{
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return new ReadOnlyCollection<string>(new List<string>());
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}
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return Array.AsReadOnly<string>(attributes.Keys.ToArray());
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}
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}
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/// <summary>
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/// Determine if the DomNode has the requested attribute.
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/// </summary>
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/// <param name="attributeName">The name of the attribute value.</param>
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/// <returns>
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/// True if the attribute exists in the DomNode, false if it does not.
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/// </returns>
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public bool HasAttribute(string attributeName)
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{
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if (attributes == null)
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{
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return false;
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}
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return attributes.ContainsKey(attributeName);
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}
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/// <summary>
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/// Gets the enumerator.
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/// </summary>
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/// <returns>
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/// The enumerator.
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/// </returns>
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public IEnumerator<KeyValuePair<string, string>> GetEnumerator()
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{
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if (attributes == null)
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{
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return new Dictionary<string, string>().GetEnumerator();
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}
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return attributes.GetEnumerator();
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}
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System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
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{
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return GetEnumerator();
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}
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}
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}
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