private TagNode CollectForTag(TagNode tag, ref int index)
{
if (tag.Closed) // if self-closing tag, do not collect inner elements
return tag;
if (String.Compare(tag.TagName, "if", true) == 0) {
tag = new IfTag(tag.Line, tag.Column, tag.GetAttributeValue("test"));
}
TagNode collectTag = tag;
for (index++; index < nodes.Count; index++) {
Node node = nodes[index];
if (node is TextNode)
collectTag.ChildNodes.Add(node);
else if (node is Expression)
collectTag.ChildNodes.Add(node);
else if (node is TagNode) {
TagNode innerTag = (TagNode)node;
if (string.Compare(innerTag.TagName, "else", true) == 0) {
if (collectTag is IfTag) {
((IfTag)collectTag).FalseBranch = innerTag;
collectTag = innerTag;
} else
throw new ParseException("else tag has to be positioned inside of if or elseif tag", innerTag.Line, innerTag.Column);
} else if (string.Compare(innerTag.TagName, "elif", true) == 0) {
if (collectTag is IfTag) {
TagNode newTag = new IfTag(innerTag.Line, innerTag.Column, innerTag.GetAttributeValue("test"));
((IfTag)collectTag).FalseBranch = newTag;
collectTag = newTag;
} else
throw new ParseException("elseif tag is not positioned properly", innerTag.Line, innerTag.Column);
} else
collectTag.ChildNodes.Add(CollectForTag(innerTag, ref index));
} else if (node is TagEnd) {
TagEnd tagClose = (TagEnd)node;
if (string.Compare(tag.TagName, tagClose.TagName, true) == 0)
return tag;
throw new ParseException("Close tag for " + tagClose.TagName + " doesn't have matching start tag.", node.Line, node.Column);
} else
throw new ParseException("Invalid node: " + node.GetType(), node.Line, node.Column);
}
throw new ParseException("Start tag: " + tag.TagName + " does not have matching end tag.", tag.Line, tag.Column);
}
private void ProcessIf(IfTag tagIf)
{
bool condition;
try {
object value = EvaluateExpression(tagIf.TestExpression);
condition = Util.ToBoolean(value);
} catch (Exception ex) {
OnError("Error evaluating condition for if statement: " + ex.Message, tagIf.Line, tagIf.Column);
return;
}
if (condition)
ProcessNodes(tagIf.ChildNodes);
else
ProcessNode(tagIf.FalseBranch);
}