/// <summary>
/// Parse given stylesheet for media CSS blocks<br/>
/// This blocks are added under the specific media block they are found.
/// </summary>
/// <param name="cssData">the CSS data to fill with parsed CSS objects</param>
/// <param name="stylesheet">the stylesheet to parse</param>
private static void ParseMediaStyleBlocks(CssData cssData, string stylesheet)
{
int startIdx = 0;
string atrule;
while ((atrule = RegexParserUtils.GetCssAtRules(stylesheet, ref startIdx)) != null)
{
//Just process @media rules
if (!atrule.StartsWith("@media", StringComparison.InvariantCultureIgnoreCase))
{
continue;
}
//Extract specified media types
MatchCollection types = RegexParserUtils.Match(RegexParserUtils.CssMediaTypes, atrule);
if (types.Count == 1)
{
string line = types[0].Value;
if (line.StartsWith("@media", StringComparison.InvariantCultureIgnoreCase) && line.EndsWith("{"))
{
//Get specified media types in the at-rule
string[] media = line.Substring(6, line.Length - 7).Split(' ');
//Scan media types
foreach (string t in media)
{
if (!String.IsNullOrEmpty(t.Trim()))
{
//Get blocks inside the at-rule
var insideBlocks = RegexParserUtils.Match(RegexParserUtils.CssBlocks, atrule);
//Scan blocks and feed them to the style sheet
foreach (Match insideBlock in insideBlocks)
{
FeedStyleBlock(cssData, insideBlock.Value, t.Trim());
}
}
}
}
}
}
}
/// <summary>
/// Parses the document
/// </summary>
public static CssBox ParseDocument(string document)
{
document = RemoveHtmlComments(document);
int lastEnd = -1;
CssBox root = null;
CssBox curBox = null;
var tags = RegexParserUtils.Match(RegexParserUtils.HtmlTag, document);
foreach (Match tagmatch in tags)
{
string text = tagmatch.Index > 0 ? document.Substring(lastEnd + 1, tagmatch.Index - lastEnd - 1) : String.Empty;
var emptyText = String.IsNullOrEmpty(text.Trim());
if (!emptyText)
{
if (curBox == null)
{
root = curBox = CssBox.CreateBlock();
}
var abox = CssBox.CreateBox(curBox);
abox.Text = text;
}
var tag = ParseHtmlTag(tagmatch.Value);
if (tag.IsClosing)
{
// handle tags that have no content but whitespace
if (emptyText && curBox != null && curBox.Boxes.Count == 0 && !string.IsNullOrEmpty(text))
{
var abox = CssBox.CreateBox(curBox);
abox.Text = " ";
}
// need to find the parent tag to go one level up
curBox = DomUtils.FindParent(root, tag.Name, curBox);
}
else if (tag.IsSingle)
{
// the current box is not changed
new CssBox(curBox, tag);
}
else
{
// go one level down, make the new box the current box
curBox = new CssBox(curBox, tag);
}
if (root == null && curBox != null)
{
root = curBox;
root.Display = CssConstants.Block;
}
lastEnd = tagmatch.Index + tagmatch.Length - 1;
}
if (root == null)
{
root = CssBox.CreateBlock();
var abox = CssBox.CreateBox(root);
abox.Text = document;
}
else if (lastEnd < document.Length)
{
var endText = document.Substring(lastEnd + 1);
if (!string.IsNullOrEmpty(endText.Trim()))
{
var abox = CssBox.CreateBox(root);
abox.Text = endText;
}
}
return(root);
}
/// <summary>
/// Parse raw html tag source to <seealso cref="HtmlTag"/> object.<br/>
/// Extract attributes found on the tag.
/// </summary>
/// <param name="source">the html tag to parse</param>
private static HtmlTag ParseHtmlTag(string source)
{
source = source.Substring(1, source.Length - (source.Length > 2 && source[source.Length - 2] == '/' ? 3 : 2));
int spaceIndex = source.IndexOf(" ");
//Extract tag name
string tagName;
if (spaceIndex < 0)
{
tagName = source;
}
else
{
tagName = source.Substring(0, spaceIndex);
}
//Check if is end tag
bool isClosing = false;
if (tagName.StartsWith("/"))
{
isClosing = true;
tagName = tagName.Substring(1);
}
tagName = tagName.ToLower();
//Extract attributes
var attributes = new Dictionary <string, string>();
var atts = RegexParserUtils.Match(RegexParserUtils.HmlTagAttributes, source);
foreach (Match att in atts)
{
if (!att.Value.Contains(@"="))
{
if (!attributes.ContainsKey(att.Value))
{
attributes.Add(att.Value.ToLower(), string.Empty);
}
}
else
{
//Extract attribute and value
string[] chunks = new string[2];
chunks[0] = att.Value.Substring(0, att.Value.IndexOf('='));
chunks[1] = att.Value.Substring(att.Value.IndexOf('=') + 1);
string attname = chunks[0].Trim();
string attvalue = chunks[1].Trim();
if (attvalue.Length > 2 && ((attvalue.StartsWith("\"") && attvalue.EndsWith("\"")) || (attvalue.StartsWith("\'") && attvalue.EndsWith("\'"))))
{
attvalue = attvalue.Substring(1, attvalue.Length - 2);
}
if (!attributes.ContainsKey(attname))
{
attributes.Add(attname, attvalue);
}
}
}
return(new HtmlTag(tagName, attributes, isClosing));
}