public TemplateProcessingService()
{
InternalContext = new TextTemplateProcessingContext();
InitializeDefaultFunctions();
InitializeDefaultSubstitutions();
}
public string ProcessTemplate(Template template, TextTemplateProcessingContext context = null)
{
if (context != null)
{
// make sure provided context has access to all default substitutions
foreach (var sub in InternalContext.Substitutions)
{
context.Substitutions.AddOrUpdateSubstitution(sub);
}
// make sure provided context has access to all default functions
foreach (var function in InternalContext.Functions)
{
if (!context.Functions.Contains(function))
context.Functions.AddFunction(function);
}
}
var sb = new StringBuilder(template.RawPattern);
var placeholders = template.GetPlaceholders();
for (int i = placeholders.Count - 1; i >= 0; i--)
{
var ph = placeholders[i];
object value = null;
if (context != null && ph.TryEvaluate(context, out value))
{
sb.Replace(ph.RawValue, value.ToString(valueWhenNull: "[NULL]", valueWhenEmpty: ""), ph.StartIndex, ph.Length);
}
else if (ph.TryEvaluate(InternalContext, out value))
{
sb.Replace(ph.RawValue, value.ToString(valueWhenNull: "[NULL]", valueWhenEmpty: ""), ph.StartIndex, ph.Length);
}
else
{
Diagnostics.Log.Warning(() => "Unable to process placeholder '{0}'".FormatWith(ph.RawValue));
sb.Replace(ph.RawValue, "");
}
}
return sb.ToString();
}
public string Format(Entities.DiagnosticEvent de, TypeDescriptorCollection typeDescriptorCollection)
{
var context = new TextTemplateProcessingContext();
foreach (var property in de.Properties)
{
var prop = property;
context.Substitutions.AddOrUpdateSubstitution(
property.UniqueName,
(cx) =>
{
return prop.Value;
});
}
var txt = TextTemplateProcessingServce.ProcessTemplate(Template, context);
return txt.ExpandTabs();
}
public string ProcessTemplate(string templateText, TextTemplateProcessingContext context = null)
{
var template = Template.FromText(templateText);
return ProcessTemplate(template, context);
}