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AngleSharp

, 3 Jul 2013 BSD
Bringing the DOM to C# with a HTML5/CSS3 parser written in C#.
AngleSharp
Css
Tokens
DOM
Collections
Css
Properties
Rules
Selector
Values
Enums
Exception
Html
Basic
Formatting
Forms
Frames
Head
Lists
Media
Objects
Semantic
Tables
Interfaces
Mathml
Objects
Svg
Various
Xml
Foundation
Attributes
Helpers
Mutations
Html
Tokens
Properties
Stream
Xml
Tokens
packages
ModernUI.WPF.1.0.4
lib
net40
FirstFloor.ModernUI.dll
Microsoft.Windows.Shell.dll
net45
FirstFloor.ModernUI.dll
ModernUI.WPF.1.0.4.nupkg
ModernUI.WPF.1.0.4.nuspec
OxyPlot.Core.2013.1.49.1
lib
portable-net4+sl4+wp71+win8
OxyPlot.dll
OxyPlot.Core.2013.1.49.1.nupkg
OxyPlot.Core.2013.1.49.1.nuspec
OxyPlot.Wpf.2013.1.49.1
lib
NET40
OxyPlot.Wpf.dll
OxyPlot.Xps.dll
NET45
OxyPlot.Wpf.dll
OxyPlot.Xps.dll
OxyPlot.Wpf.2013.1.49.1.nupkg
OxyPlot.Wpf.2013.1.49.1.nuspec
Samples
Logo.ico
Pages
Properties
ViewModels
Documents
using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Text;

namespace AngleSharp.DOM.Collections
{
    /// <summary>
    /// The abstract template class for most DOM collections.
    /// </summary>
    /// <typeparam name="T">The type of elements to contain.</typeparam>
    public abstract class BaseCollection<T> : IHTMLObject, IEnumerable<T> where T : Node
    {
        #region Members

        /// <summary>
        /// The contained entries.
        /// </summary>
        protected List<T> _entries;

        #endregion

        #region ctor

        /// <summary>
        /// Creates a new list of nodes.
        /// </summary>
        internal BaseCollection()
        {
            _entries = new List<T>();
        }

        #endregion

        #region Index

        /// <summary>
        /// Gets or sets a node within the list of nodes.
        /// </summary>
        /// <param name="index">The 0-based index of the node.</param>
        /// <returns>The node at the specified index.</returns>
        [DOM("item")]
        public T this[Int32 index]
        {
            get { return index >= 0 && index < _entries.Count ? _entries[index] : null; }
            set { _entries[index] = value; }
        }

        #endregion

        #region Properties

        /// <summary>
        /// Gets the number of nodes in the list.
        /// </summary>
        [DOM("length")]
        public Int32 Length
        {
            get { return _entries.Count; }
        }

        #endregion

        #region Internal methods

        /// <summary>
        /// Clears the list of nodes.
        /// </summary>
        internal protected void Clear()
        {
            _entries.Clear();
        }

        /// <summary>
        /// Adds a node to the list of nodes.
        /// </summary>
        /// <param name="node">The node to add.</param>
        /// <returns>The modified collection.</returns>
        internal protected void Add(T node)
        {
            _entries.Add(node);
        }

        /// <summary>
        /// Inserts a node at the specified index.
        /// </summary>
        /// <param name="index">The zero-based index at which the node should be inserted.</param>
        /// <param name="node">The node to add.</param>
        /// <returns>The modified collection.</returns>
        internal protected void Insert(int index, T node)
        {
            _entries.Insert(index, node);
        }

        /// <summary>
        /// Removes the specified node from the list.
        /// </summary>
        /// <param name="node">The node to remove.</param>
        /// <returns>The modified collection.</returns>
        internal protected void Remove(T node)
        {
            if (_entries.Contains(node))
            {
                _entries.Remove(node);
            }
        }

        /// <summary>
        /// Removes the specified node from the list.
        /// </summary>
        /// <param name="index">The 0-based index of the node to remove.</param>
        /// <returns>The modified collection.</returns>
        internal protected virtual void RemoveAt(int index)
        {
            var entry = _entries[index];
            _entries.RemoveAt(index);
        }

        /// <summary>
        /// Looks for the specified node in the list.
        /// </summary>
        /// <param name="node">The node to look for.</param>
        /// <returns>True if such a node exists, otherwise false.</returns>
        internal bool Contains(T node)
        {
            return IndexOf(node) != -1;
        }

        /// <summary>
        /// Returns the index of node in the list.
        /// </summary>
        /// <param name="node">The node to look for.</param>
        /// <returns>The index [0, Count - 1] of the element if its exists, otherwise -1.</returns>
        internal int IndexOf(T node)
        {
            for (var i = 0; i < _entries.Count; i++)
                if (_entries[i] == node)
                    return i;

            return -1;
        }

        #endregion

        #region IEnumerable implementation

        /// <summary>
        /// Returns an enumerator that iterates through the list.
        /// </summary>
        /// <returns>An IEnumerator for NodeList.</returns>
        public IEnumerator<T> GetEnumerator()
        {
            return _entries.GetEnumerator();
        }

        /// <summary>
        /// Returns an enumerator that iterates through the list.
        /// </summary>
        /// <returns>An IEnumerator for NodeList.</returns>
        IEnumerator IEnumerable.GetEnumerator()
        {
            return ((IEnumerable)_entries).GetEnumerator();
        }

        #endregion

        #region String representation

        /// <summary>
        /// Returns an HTML-code representation of the nodelist.
        /// </summary>
        /// <returns>A string containing the HTML code.</returns>
        public virtual String ToHtml()
        {
            var sb = new StringBuilder();

            foreach (var entry in _entries)
                sb.AppendLine(entry.ToHtml());

            return sb.ToString();
        }

        /// <summary>
        /// Returns a string representing the collection.
        /// </summary>
        /// <returns>A string describing the collection.</returns>
        public override String ToString()
        {
            var sb = new StringBuilder();
            sb.Append("DOM.").Append(GetType().Name).Append(':');

            if (Length == 0)
                sb.AppendLine().Append("\t--No elements available--");

            foreach (var element in this)
                sb.AppendLine().Append("\t").Append(element.ToString());

            return sb.ToString();
        }

        #endregion
    }
}

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This article, along with any associated source code and files, is licensed under The BSD License

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About the Author

Florian Rappl
Architect
Germany Germany
Florian lives in Munich, Germany. He started his programming career with Perl. After programming C/C++ for some years he discovered his favorite programming language C#. He did work at Siemens as a programmer until he decided to study Physics.

During his studies he worked as an IT consultant for various companies. After graduating with a PhD in theoretical particle Physics he is working as a senior technical consultant in the field of home automation and IoT.

Florian has been giving lectures in C#, HTML5 with CSS3 and JavaScript, software design, and other topics. He is regularly giving talks at user groups, conferences, and companies. He is actively contributing to open-source projects. Florian is the maintainer of AngleSharp, a completely managed browser engine.

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