private void ProcessTag(Tag tag)
{
string name = tag.Name.ToLowerInvariant();
try {
switch (name) {
case "define":
break;
case "else":
ProcessElements(tag.InnerTokens);
break;
case "using":
object val = EvalExpression(tag.AttributeValue("tmpl"));
ProcessTmpl(val.ToString(), tag);
break;
case "foreach":
ProcessForeach(tag);
break;
case "for":
ProcessFor(tag);
break;
default:
ProcessTmpl(tag.Name, tag);
break;
}
} catch (TmplException ex) {
DisplayError(ex);
} catch (Exception ex) {
DisplayError("Error executing tag '" + name + "': " + ex.Message, tag.Line, tag.Col);
}
}
private void ProcessFor(Tag tag)
{
Expression expFrom = tag.AttributeValue("from");
if (expFrom == null) {
throw new TmplException("For is missing required attribute: start", tag.Line, tag.Col);
}
Expression expTo = tag.AttributeValue("to");
if (expTo == null) {
throw new TmplException("For is missing required attribute: to", tag.Line, tag.Col);
}
Expression expIndex = tag.AttributeValue("index");
if (expIndex == null) {
throw new TmplException("For is missing required attribute: index", tag.Line, tag.Col);
}
object obj = EvalExpression(expIndex);
string indexName = obj.ToString();
int start = Convert.ToInt32(EvalExpression(expFrom));
int end = Convert.ToInt32(EvalExpression(expTo));
for (int index = start; index <= end; index++) {
SetValue(indexName, index);
ProcessElements(tag.InnerTokens);
}
}
private void ProcessForeach(Tag tag)
{
Expression expCollection = tag.AttributeValue("list");
if (expCollection == null) {
throw new TmplException("Foreach is missing required attribute: collection", tag.Line, tag.Col);
}
object collection = EvalExpression(expCollection);
if (!(collection is IEnumerable)) {
throw new TmplException("Collection used in foreach has to be enumerable", tag.Line, tag.Col);
}
Expression expVar = tag.AttributeValue("var");
if (expCollection == null) {
throw new TmplException("Foreach is missing required attribute: var", tag.Line, tag.Col);
}
object varObject = EvalExpression(expVar);
if (varObject == null) {
varObject = "foreach";
}
string varname = varObject.ToString();
Expression expIndex = tag.AttributeValue("index");
string indexname = null;
if (expIndex != null) {
object obj = EvalExpression(expIndex);
if (obj != null) {
indexname = obj.ToString();
}
}
IEnumerator ienum = ((IEnumerable) collection).GetEnumerator();
int index = 0;
while (ienum.MoveNext()) {
index++;
object value = ienum.Current;
_variables[varname] = value;
if (indexname != null) {
_variables[indexname] = index;
}
ProcessElements(tag.InnerTokens);
}
}
private Tag CollectForTag(Tag tag, ref int index)
{
if (tag.IsClosed) {
return tag;
}
if (string.Compare(tag.Name, "if", true) == 0) {
tag = new IfStatement(tag.Line, tag.Col, tag.AttributeValue("test"));
}
Tag collectTag = tag;
for (index++; index < elements.Count; index++) {
Token elem = elements[index];
if (elem is Text) {
collectTag.InnerTokens.Add(elem);
} else if (elem is Expression) {
collectTag.InnerTokens.Add(elem);
} else if (elem is Tag) {
Tag innerTag = (Tag) elem;
if (string.Compare(innerTag.Name, "else", true) == 0) {
if (collectTag is IfStatement) {
((IfStatement) collectTag).FalseBranch = innerTag;
collectTag = innerTag;
} else {
throw new TmplException("else tag has to be positioned inside of if or elseif tag " + innerTag.Line + "," + innerTag.Col, innerTag.Line, innerTag.Col);
}
} else if (string.Compare(innerTag.Name, "elseif", true) == 0) {
if (collectTag is IfStatement) {
Tag newTag = new IfStatement(innerTag.Line, innerTag.Col, innerTag.AttributeValue("test"));
((IfStatement) collectTag).FalseBranch = newTag;
collectTag = newTag;
} else {
throw new TmplException("elseif tag is not positioned properly" + innerTag.Line + "," + innerTag.Col, innerTag.Line, innerTag.Col);
}
} else {
collectTag.InnerTokens.Add(CollectForTag(innerTag, ref index));
}
} else if (elem is StatementClose) {
StatementClose tagClose = (StatementClose) elem;
return tag;
} else {
throw new TmplException("Invalid element: [" + elem.GetType().ToString() + "] " + elem.Line + "," + elem.Col, elem.Line, elem.Col);
}
}
throw new TmplException("Start tag: [" + tag.Name + "] does not have matching end tag." + tag.Line + "," + tag.Col, tag.Line, tag.Col);
}