source: branches/HeuristicLab.Problems.GrammaticalOptimization/SharpVectorCss/Css/CssRule.cs @ 14035

using System;
using System.Xml;
using System.Collections.Generic;
using System.Text.RegularExpressions;

using SharpVectors.Dom.Stylesheets;

namespace SharpVectors.Dom.Css
{
  public abstract class CssRule : ICssRule
  {
    #region Constructors

    protected CssRule(object parent, bool readOnly, 
            IList<string> replacedStrings, CssStyleSheetType origin)
    {
      if(parent is CssRule)
      {
        _ParentRule = (CssRule)parent;
      }
      else if(parent is CssStyleSheet)
      {
        _ParentStyleSheet = (CssStyleSheet)parent;
      }
      else
      {
        throw new Exception("The CssRule constructor can only take a CssRule or CssStyleSheet as it's second argument " + parent.GetType());
      }
      this.origin = origin;
            this.replacedStrings = replacedStrings;
            this.readOnly = readOnly;
    }

    #endregion

    #region Private and protected fields
    /// <summary>
    /// The origin stylesheet type of this rule
    /// </summary>
    protected CssStyleSheetType origin;
    private IList<string> replacedStrings;
    /// <summary>
    /// Specifies the read/write state of the instance
    /// </summary>
    protected bool readOnly;

    #endregion

    #region Private and internal methods
    private string StringReplaceEvaluator(Match match)
    {
            int i = Convert.ToInt32(match.Groups["number"].Value);
            string r = replacedStrings[i];
      if(!match.Groups["quote"].Success) r = r.Trim(new char[2]{'\'', '"'});
      return r;
    }

    internal string DeReplaceStrings(string s)
    {
      Regex re = new Regex(@"(?<quote>"")?<<<(?<number>[0-9]+)>>>""?");
      return re.Replace(s, new MatchEvaluator(StringReplaceEvaluator));
    }

    /// <summary>
    /// Used to find matching style rules in the cascading order
    /// </summary>
    /// <param name="elt">The element to find styles for</param>
    /// <param name="pseudoElt">The pseudo-element to find styles for</param>
    /// <param name="ml">The medialist that the document is using</param>
    /// <param name="csd">A CssStyleDeclaration that holds the collected styles</param>
    protected internal virtual void GetStylesForElement(XmlElement elt, 
            string pseudoElt, MediaList ml, CssCollectedStyleDeclaration csd)
    {
    }

    #endregion

    #region Public methods
    /// <summary>
    /// Finds the owner node of this rule
    /// </summary>
    /// <returns>The owner XmlNode</returns>
    public XmlNode ResolveOwnerNode()
    {
      if(ParentRule != null)
      {
        return ((CssRule)ParentRule).ResolveOwnerNode();
      }
      else
      {
        return ((StyleSheet)ParentStyleSheet).ResolveOwnerNode();
      }
    }

    #endregion
    
    #region Implementation of ICssRule
    private CssStyleSheet _ParentStyleSheet = null;
    /// <summary>
    /// The style sheet that contains this rule
    /// </summary>
    public ICssStyleSheet ParentStyleSheet
    {
      get
      {
        return _ParentStyleSheet;
      }
    }

    private CssRule _ParentRule = null;
    /// <summary>
    /// If this rule is contained inside another rule (e.g. a style rule inside an @media block), this is the containing rule. If this rule is not nested inside any other rules, this returns null
    /// </summary>
    public ICssRule ParentRule
    {
      get
      {
        return _ParentRule;
      }
    }

    /// <summary>
    /// The type of the rule, as defined above. The expectation is that binding-specific casting methods can be used to cast down from an instance of the CSSRule interface to the specific derived interface implied by the type.
    /// </summary>
    public abstract CssRuleType Type
    {
      get;
    }

    /// <summary>
    /// The parsable textual representation of the rule. This reflects the current state of the rule and not its initial value.
    /// </summary>
    public virtual string CssText
    {
      get
      {
        throw new NotImplementedException("CssText");
        //return _CssText;
      }
      set
      {
                throw new NotImplementedException("CssText");
      }
    }
    #endregion
  }
}