TextWriter writer; // all output is sent here
#endregion Fields
#region Constructors
/// <summary>
/// create template manager using a template
/// </summary>
public TemplateManager(Template template)
{
this.mainTemplate = template;
this.currentTemplate = template;
this.silentErrors = false;
Init();
}
public Template(string name, List<Element> elements, Template parent)
{
this.name = name;
this.elements = elements;
this.parent = parent;
InitTemplates();
}
protected void ProcessTemplate(string name, Tag tag)
{
if (customTags != null && customTags.ContainsKey(name))
{
ExecuteCustomTag(tag);
return;
}
Template useTemplate = currentTemplate.FindTemplate(name);
if (useTemplate == null)
{
string msg = string.Format("Template '{0}' not found", name);
throw new TemplateRuntimeException(msg, tag.Line, tag.Col);
}
// process inner elements and save content
TextWriter saveWriter = writer;
writer = new StringWriter();
string content = string.Empty;
try
{
ProcessElements(tag.InnerElements);
content = writer.ToString();
}
finally
{
writer = saveWriter;
}
Template saveTemplate = currentTemplate;
variables = new VariableScope(variables);
variables["innerText"] = content;
try
{
foreach (TagAttribute attrib in tag.Attributes)
{
object val = EvalExpression(attrib.Expression);
variables[attrib.Name] = val;
}
currentTemplate = useTemplate;
ProcessElements(currentTemplate.Elements);
}
finally
{
variables = variables.Parent;
currentTemplate = saveTemplate;
}
}
/// <summary>
/// processes current template and sends output to writer
/// </summary>
/// <param name="writer"></param>
public void Process(TextWriter writer)
{
this.writer = writer;
this.currentTemplate = mainTemplate;
if (handler != null)
{
SetValue("this", handler);
handler.BeforeProcess(this);
}
ProcessElements(mainTemplate.Elements);
if (handler != null)
handler.AfterProcess(this);
}
/// <summary>
/// adds template that can be used within execution
/// </summary>
/// <param name="template"></param>
public void AddTemplate(Template template)
{
mainTemplate.Templates.Add(template.Name, template);
}
/// <summary>
/// go thru all tags and see if they are template tags and add
/// them to this.templates collection
/// </summary>
private void InitTemplates()
{
this.templates = new Dictionary<string, Template>(StringComparer.InvariantCultureIgnoreCase);
foreach (Element elem in elements)
{
if (elem is Tag)
{
Tag tag = (Tag)elem;
if (string.Compare(tag.Name, "template", true) == 0)
{
Expression ename = tag.AttributeValue("name");
string tname;
if (ename is StringLiteral)
tname = ((StringLiteral)ename).Content;
else
tname = "?";
Template template = new Template(tname, tag.InnerElements, this);
templates[tname] = template;
}
}
}
}
