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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;

namespace AngleSharp.DOM.Collections
{
    /// <summary>
    /// Represents a list of DOMTokens.
    /// </summary>
    [DOM("DOMTokenList")]
    public sealed class DOMTokenList : IHTMLObject, IEnumerable<String>
    {
        #region Members

        List<String> _tokens;
        Element _parent;
        Boolean _blocking;
        String _attribute;

        #endregion

        #region ctor

        /// <summary>
        /// Creates a new list of tokens.
        /// </summary>
        internal DOMTokenList(Element parent, String attribute)
        {
            this._attribute = attribute;
            this._parent = parent;
            this._tokens = new List<String>();
            this._blocking = false;
        }

        #endregion

        #region Properties

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

        /// <summary>
        /// Gets an item in the list by its index.
        /// </summary>
        /// <param name="index">The index of the token.</param>
        /// <returns>The token at the specified index.</returns>
        [DOM("item")]
        public String this[Int32 index]
        {
            get
            {
                if (index < 0 || index >= _tokens.Count)
                    return null;

                return _tokens[index];
            }
        }

        #endregion

        #region Methods

        /// <summary>
        /// Returns true if the underlying string contains token, otherwise false.
        /// </summary>
        /// <param name="token">The token to consider.</param>
        /// <returns>True if the string contained the token, otherwise false.</returns>
        [DOM("contains")]
        public Boolean Contains(String token)
        {
            if(_tokens.Contains(token))
                return true;

            return false;
        }

        /// <summary>
        /// Remove token from the underlying string.
        /// </summary>
        /// <param name="token">The token to remove.</param>
        /// <returns>The current token list.</returns>
        [DOM("remove")]
        public DOMTokenList Remove(String token)
        {
            _tokens.Remove(token);
            Propagate();
            return this;
        }

        /// <summary>
        /// Adds token to the underlying string.
        /// </summary>
        /// <param name="token">The token to add.</param>
        /// <returns>The current token list.</returns>
        [DOM("add")]
        public DOMTokenList Add(String token)
        {
            if (!_tokens.Contains(token))
            {
                _tokens.Add(token);
                Propagate();
            }

            return this;
        }

        /// <summary>
        /// Removes token from string and returns false. If token doesn't exist it's added and the function returns true.
        /// </summary>
        /// <param name="token">The token to consider.</param>
        /// <returns>True if the string contained the token, otherwise false.</returns>
        [DOM("toggle")]
        public Boolean Toggle(String token)
        {
            var contains = _tokens.Contains(token);

            if (contains)
                _tokens.Remove(token);
            else
                _tokens.Add(token);

            Propagate();
            return !contains;
        }

        #endregion

        #region Internal methods

        /// <summary>
        /// Updates the DOMTokenList with the given value.
        /// </summary>
        /// <param name="value">The new value.</param>
        internal void Update(String value)
        {
            if (!_blocking)
            {
                _tokens.Clear();
                var elements = value.SplitSpaces();

                for (int i = 0; i < elements.Length; i++)
                    if (!_tokens.Contains(elements[i]))
                        _tokens.Add(elements[i]);
            }
        }

        /// <summary>
        /// Returns true if the underlying string contains at least one of the tokens, otherwise false.
        /// </summary>
        /// <param name="tokens">The tokens to consider.</param>
        /// <returns>True if the string contained a token, otherwise false.</returns>
        internal Boolean Contains(String[] tokens)
        {
            for (int i = 0; i < tokens.Length; i++)
                if (this._tokens.Contains(tokens[i]))
                    return true;

            return false;
        }

        #endregion

        #region Helper

        /// <summary>
        /// Sets the current value of the attribute.
        /// </summary>
        void Propagate()
        {
            _blocking = true;
            _parent.SetAttribute(_attribute, ToHtml());
            _blocking = false;
        }

        #endregion

        #region IEnumerable implementation

        /// <summary>
        /// Returns an enumerator that iterates through the strings in the collection.
        /// </summary>
        /// <returns>An enumerator that can be used to iterate through the tokens.</returns>
        public IEnumerator<String> GetEnumerator()
        {
            return _tokens.GetEnumerator();
        }

        /// <summary>
        /// Returns an enumerator that iterates through the strings in the collection.
        /// </summary>
        /// <returns>An enumerator that can be used to iterate through the tokens.</returns>
        IEnumerator IEnumerable.GetEnumerator()
        {
            return GetEnumerator();
        }

        #endregion

        #region String representation

        /// <summary>
        /// Returns an HTML-code representation of the token list.
        /// </summary>
        /// <returns>A string containing the HTML code.</returns>
        public String ToHtml()
        {
            return String.Join(" ", _tokens);
        }

        #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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