Tag ReadTag()
{
Consume(TokenKind.TagStart);
Token name = Consume(TokenKind.ID);
Tag tag = new Tag(name.Line, name.Col, name.Data);
while (true)
{
if (Current.TokenKind == TokenKind.ID)
tag.Attributes.Add(ReadAttribute());
else if (Current.TokenKind == TokenKind.TagEnd)
{
Consume();
break;
}
else if (Current.TokenKind == TokenKind.TagEndClose)
{
Consume();
tag.IsClosed = true;
break;
}
else
throw new ParseException("Invalid token in tag: " + Current.TokenKind, Current.Line, Current.Col);
}
return tag;
}
private Tag CollectForTag(Tag tag, ref int index)
{
if (tag.IsClosed) // if self-closing tag, do not collect inner elements
{
return tag;
}
if (string.Compare(tag.Name, "if", true) == 0)
{
tag = new TagIf(tag.Line, tag.Col, tag.AttributeValue("test"));
}
Tag collectTag = tag;
for (index++; index < elements.Count; index++)
{
Element elem = elements[index];
if (elem is Entity.Text)
collectTag.InnerElements.Add(elem);
else if (elem is Expression)
collectTag.InnerElements.Add(elem);
else if (elem is Tag)
{
Tag innerTag = (Tag) elem;
if (string.Compare(innerTag.Name, "else", true) == 0)
{
if (collectTag is TagIf)
{
((TagIf) collectTag).FalseBranch = innerTag;
collectTag = innerTag;
}
else
throw new ParseException("else tag has to be positioned inside of if or elseif tag", innerTag.Line, innerTag.Col);
}
else if (string.Compare(innerTag.Name, "elseif", true) == 0)
{
if (collectTag is TagIf)
{
Tag newTag = new TagIf(innerTag.Line, innerTag.Col, innerTag.AttributeValue("test"));
((TagIf) collectTag).FalseBranch = newTag;
collectTag = newTag;
}
else
throw new ParseException("elseif tag is not positioned properly", innerTag.Line, innerTag.Col);
}
else
collectTag.InnerElements.Add(CollectForTag(innerTag, ref index));
}
else if (elem is TagClose)
{
TagClose tagClose = (TagClose) elem;
if (string.Compare(tag.Name, tagClose.Name, true) == 0)
return tag;
throw new ParseException("闭合标签" + tagClose.Name + "找不到开始标签，错误标签位于：行" + elem.Line.ToString() + "列" + elem.Col.ToString(), elem.Line, elem.Col);
}
else
throw new ParseException("Invalid element: " + elem.GetType().ToString(), elem.Line, elem.Col);
}
throw new ParseException("开始标签" + tag.Name + "找不到闭合标签，错误标签位于：行" + tag.Line.ToString() + "列" + tag.Col.ToString(), tag.Line, tag.Col);
}