private static void AddStyleReference(string baseUrl, ArrayList list, string ruleName)
{
string listImagePath = GetPathFromStyleUrl(ruleName);
if (listImagePath != null)
{
ResourceUrlInfo urlInfo = new ResourceUrlInfo();
urlInfo.ResourceUrl = listImagePath;
urlInfo.ResourceAbsoluteUrl = UrlHelper.EscapeRelativeURL(baseUrl, listImagePath);
urlInfo.ResourceType = HTMLTokens.Img;
list.Add(urlInfo);
}
}
private static void AddAttributeToList(string attributeName, IHTMLElement element, ArrayList resources)
{
// For this element, try to find the attribute containing a relative path
string path = null;
Object pathObject = element.getAttribute(attributeName, HTMLAttributeFlags.DoNotEscapePaths);
if (pathObject != DBNull.Value)
{
path = (string)pathObject;
}
// If a valid path was discovered, add it to the list
if (path != null)
{
ResourceUrlInfo info = new ResourceUrlInfo();
info.ResourceUrl = path;
info.ResourceType = element.tagName;
info.InnerText = element.innerText;
resources.Add(info);
}
}
// Depth is here because of an IE bug-
/*
index.htm
<style>
@import(url1.css)
</style>
url1.css
@import(url2.css)
url2.css
@import(url3.css)
Enumerating the import statement in url2.css will cause an out of memory exception
and destabilize / crash IE. The depth restriction causes us to skip imports that
are at that depth or deeper.
*/
private static void AddSheetReferencesToList(ArrayList list, IHTMLStyleSheet styleSheet, string baseUrl, int depth)
{
try
{
if (styleSheet.href != null)
baseUrl = UrlHelper.EscapeRelativeURL(baseUrl, styleSheet.href);
// handle style sheet imports
if (styleSheet.imports.length > 0 && depth < 2)
{
IEnumerator importEnum = styleSheet.imports.GetEnumerator();
while (importEnum.MoveNext())
{
// Add this style sheet to the reference list
IHTMLStyleSheet importSheet = (IHTMLStyleSheet)importEnum.Current;
string sheetPath = importSheet.href;
if (baseUrl != "about:blank" && !UrlHelper.IsUrl(importSheet.href))
sheetPath = UrlHelper.EscapeRelativeURL(baseUrl, importSheet.href);
ResourceUrlInfo urlInfo = new ResourceUrlInfo();
urlInfo.ResourceUrl = importSheet.href;
urlInfo.ResourceAbsoluteUrl = sheetPath;
urlInfo.ResourceType = HTMLTokens.Style;
list.Add(urlInfo);
// Add the sheets references to the list
AddSheetReferencesToList(list, importSheet, baseUrl, depth + 1);
}
}
IHTMLStyleSheetRulesCollection rules = (IHTMLStyleSheetRulesCollection)styleSheet.rules;
for (int i = 0; i < rules.length; i++)
{
IHTMLStyleSheetRule rule = (IHTMLStyleSheetRule)rules.item(i);
IHTMLRuleStyle styleRule = (IHTMLRuleStyle)rule.style;
AddStyleReference(baseUrl, list, styleRule.backgroundImage);
AddStyleReference(baseUrl, list, styleRule.background);
AddStyleReference(baseUrl, list, styleRule.listStyleImage);
AddStyleReference(baseUrl, list, styleRule.listStyle);
}
}
catch (UnauthorizedAccessException)
{
// We weren't permitted to access the style sheets, try manual parse
}
catch (Exception ex)
{
Trace.Fail("An unexpected exception occurred while attempting to enumerate stylesheet references. " + ex.ToString());
// IE is a total pile, I hate it
}
}
