private TextWriter _Writer; // all output is sent here
#endregion Fields
#region Constructors
/// <summary>
/// 使用模板初始化模板管理器实例。
/// </summary>
/// <param name="template">指定一个模板实例。</param>
public TemplateManager(Template template)
{
_MainTemplate = template;
_CurrentTemplate = template;
_SilentErrors = false;
_Init();
}
/// <summary>
/// 从元标签库为指定的模板初始化子模板对象。
/// </summary>
/// <param name="name">指定模板名称。</param>
/// <param name="elements">指定一个元标签库。</param>
/// <param name="parent">指定父模板的实例。</param>
public Template(string name, List<Element> elements, Template parent)
{
_Name = name;
_Elements = elements;
_Parent = parent;
_InitTemplates();
}
/// <summary>
/// 从元标签库初始化模板对象。
/// </summary>
/// <param name="name">指定模板名称。</param>
/// <param name="elements">指定一个元标签库。</param>
public Template(string name, List<Element> elements)
{
_Name = name;
_Elements = elements;
_Parent = null;
_InitTemplates();
}
/// <summary>
/// 处理模板。将处理结果保存到字符编写器中。
/// </summary>
/// <param name="writer">指定一个字符编写器。</param>
public void Process(TextWriter writer)
{
_Writer = writer;
_CurrentTemplate = _MainTemplate;
if (_Handler != null)
{
SetValue("this", _Handler);
_Handler.BeforeProcess(this);
}
this.ProcessElements(_MainTemplate.Elements);
if (_Handler != null)
_Handler.AfterProcess(this);
}
/// <summary>
/// 添加一个模板实例。
/// </summary>
/// <param name="template">指定一个模板实例。</param>
public void AddTemplate(Template template)
{
_MainTemplate.Templates.Add(template.Name, template);
}
/// <summary>
/// 处理模板。
/// </summary>
/// <param name="name">指定模板名。</param>
/// <param name="tag">指定一个标签实例。</param>
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("模板未找到：'{0}'", 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
{
this.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 = this.EvalExpression(attrib.Expression);
_Variables[attrib.Name] = val;
}
_CurrentTemplate = useTemplate;
this.ProcessElements(_CurrentTemplate.Elements);
}
finally
{
_Variables = _Variables.Parent;
_CurrentTemplate = saveTemplate;
}
}
private void _InitTemplates()
{
_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;
}
}
}
}
