Click here to Skip to main content
15,885,278 members
Articles / Web Development / CSS3

AngleSharp

Rate me:
Please Sign up or sign in to vote.
5.00/5 (87 votes)
3 Jul 2013BSD28 min read 261.4K   4.3K   166  
Bringing the DOM to C# with a HTML5/CSS3 parser written in C#.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;

namespace AngleSharp.DOM.Css
{
    /// <summary>
    /// Represents an array like structure containing CSS rules.
    /// </summary>
    public sealed class CSSRuleList : IEnumerable<CSSRule>, ICSSObject
    {
        #region Members

        List<CSSRule> _rules;

        #endregion

        #region ctor

        /// <summary>
        /// Creates a new list of CSS rules.
        /// </summary>
        internal CSSRuleList()
        {
            _rules = new List<CSSRule>();
        }

        #endregion

        #region Properties

        /// <summary>
        /// Gets the number of rules stored.
        /// </summary>
        public Int32 Length
        {
            get { return _rules.Count; }
        }

        /// <summary>
        /// Gets the CSS rule at the specified index.
        /// </summary>
        /// <param name="index">The index of the rule.</param>
        /// <returns>The CSS rule or null, if the index has been invalid.</returns>
        public CSSRule this[Int32 index]
        {
            get { return index >= 0 && index < _rules.Count ? _rules[index] : null; }
        }

        #endregion

        #region Internal properties

        /// <summary>
        /// Gets the list with css rules.
        /// </summary>
        internal List<CSSRule> List
        {
            get { return _rules; }
        }

        #endregion

        #region Internal methods

        /// <summary>
        /// Removes the rule at the given index.
        /// </summary>
        /// <param name="index">The specified index.</param>
        internal void RemoveAt(Int32 index)
        {
            _rules.RemoveAt(index);
        }

        /// <summary>
        /// Inserts a rule at the specified index.
        /// </summary>
        /// <param name="index">The index where to insert.</param>
        /// <param name="rule">The rule that should be inserted.</param>
        internal void InsertAt(Int32 index, CSSRule rule)
        {
            _rules.Insert(index, rule);
        }

        #endregion

        #region Implemented interface

        /// <summary>
        /// Returns an enumerator that iterates through the collection.
        /// </summary>
        /// <returns>An enumerator that can be used to iterate through the collection.</returns>
        public IEnumerator<CSSRule> GetEnumerator()
        {
            foreach (var entry in _rules)
                yield return entry;
        }

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

        #endregion

        #region String representation

        /// <summary>
        /// Returns a CSS code representation of the rulelist.
        /// </summary>
        /// <returns>A string that contains the code.</returns>
        public String ToCss()
        {
            var sb = new StringBuilder();

            for (int i = 0; i < _rules.Count; i++)
                sb.AppendLine(_rules[i].ToCss());

            return sb.ToString();
        }

        #endregion
    }
}

By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.

If a file you wish to view isn't highlighted, and is a text file (not binary), please let us know and we'll add colourisation support for it.

License

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


Written By
Chief Technology Officer
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.

Comments and Discussions