/// <summary>
/// Creates an HTML node from a string representing literal HTML.
/// </summary>
/// <param name="html">The HTML text.</param>
/// <returns>The newly created node instance.</returns>
public static HtmlNode CreateNode(string html)
{
// REVIEW: this is *not* optimum...
HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(html);
return doc.DocumentNode.FirstChild;
}
public void Parse()
{
contentHolderId = -1;
AspContent = new Dictionary<int, string>();
// Extract tags
AspTags = AspTagsStripRegex.Matches(Raw);
GaspConditions = GaspXPConditionRegex.Matches(Raw);
GaspForeaches = GaspXPForeachRegex.Matches(Raw);
// Preprocess the HTML
// Strip the <% asp code %> (replace with a placeholder)
Processed = AspTagsStripRegex.Replace(Raw,
me =>
{
AspContent.Add(++contentHolderId, me.Value);
return "<!-- GaspXP[[" + contentHolderId + "]] -->";
});
// Strip the <condition></condition> tags
Processed = GaspXPConditionRegex.Replace(Processed,
me => "");
// Strip the <foreach></foreach> tags
Processed = GaspXPForeachRegex.Replace(Processed,
me => "");
var doc = new HtmlDocument();
doc.OptionWriteEmptyNodes = true;
doc.OptionOutputOriginalCase = true;
doc.OptionAutoCloseOnEnd = true;
// todo OptionOutputOriginalCase => doesnt seem to work for attributes! (not all?)
doc.LoadHtml(Processed);
string debug = "";
// Loop through all conditions
foreach (Match condition in GaspConditions)
{
foreach (Match tag in AttributesRegex.Matches(condition.Groups[0].Value))
{
if (tag.Groups[1].Value == "for")
{
var elementId = tag.Groups[2].Value;
// find the element
foreach (var n in doc.DocumentNode.SelectNodes("//*", GaspNamespace))
{
bool found = false;
foreach (var a in n.Attributes)
{
if (a.OriginalName != "gasp:id" || a.Value != elementId)
continue;
found = true;
break;
}
if (!found)
continue;
n.ParentNode.InsertBefore(HtmlNode.CreateNode("<% if(" + condition.Groups[2].Value + "){%>"), n);
n.ParentNode.InsertAfter(HtmlNode.CreateNode("<% } %>"), n);
}
foreach (var n in doc.DocumentNode.SelectNodes("id('" + elementId + "')"))
{
n.ParentNode.InsertBefore(HtmlNode.CreateNode("<% if(" + condition.Groups[2].Value + "){%>"), n);
n.ParentNode.InsertAfter(HtmlNode.CreateNode("<% } %>"), n);
}
}
}
}
// Loop through all foreaches
foreach (Match condition in GaspForeaches)
{
foreach (Match tag in AttributesRegex.Matches(condition.Groups[0].Value))
{
if (tag.Groups[1].Value == "for")
{
var elementId = tag.Groups[2].Value;
string key = "item";
foreach (Match keyTag in AttributesRegex.Matches(condition.Groups[0].Value))
{
if (keyTag.Groups[1].Value == "key")
{
key = keyTag.Groups[2].Value;
break;
}
}
// find the element (first search on 'gaspid')
// allows to be applied to multiple elements at once!
foreach (var n in doc.DocumentNode.SelectNodes("//*", GaspNamespace))
{
bool found = false;
foreach (var a in n.Attributes)
{
if (a.OriginalName != "gasp:id" || a.Value != elementId)
continue;
found = true;
break;
}
if (!found)
continue;
n.ParentNode.InsertBefore(HtmlNode.CreateNode("<% if(" + condition.Groups[2].Value + "){%>"), n);
n.ParentNode.InsertAfter(HtmlNode.CreateNode("<% } %>"), n);
}
foreach (var n in doc.DocumentNode.SelectNodes("id('" + elementId + "')"))
{
n.InsertBefore(HtmlNode.CreateNode("<% foreach( var " + key + " in (" + condition.Groups[2].Value + ")){%>"), n.FirstChild);
n.InsertAfter(HtmlNode.CreateNode("<% } %>"), n.LastChild);
break;
}
break;
}
}
}
// cleanup gaspid's
foreach (var n in new List<HtmlNode>(doc.DocumentNode.SelectNodes("//*", GaspNamespace)))
{
n.Attributes.Remove("gasp:id");
}
/* return the asp code back into the doc */
Processed = GaspXPContentRegex.Replace(doc.DocumentNode.OuterHtml,m => AspContent[int.Parse(m.Groups[1].Value)]);
}