public static Template FromText(string pattern)
{
var template = new Template();
template.RawPattern = pattern;
template.Placeholders = GetPlaceholdersFromPattern(pattern);
return template;
}
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();
}
void Initialize()
{
DataRequestCache.Clear();
var lines = Pattern.GetLines(keepLineBreaks: false);
var trimmedPattern = string.Concat(lines.Select(l => l.Trim()));
Template = Template.FromText(trimmedPattern);
var placeholders = Template.GetPlaceholders();
for (int i = 0; i < placeholders.Count; i++)
{
var ph = placeholders[i];
if (!ph.SubstitutionPattern.StartsWith("'") && !ph.SubstitutionPattern.EndsWith("'"))
{
var dr = new DataRequest();
dr.Data = ph.SubstitutionPattern;
DataRequestCache.Add(dr);
var cph = ph as ConditionalPlaceholder;
if (cph != null)
{
if (!cph.TrueOutcomeSubstitutionPattern.StartsWith("'") && !cph.TrueOutcomeSubstitutionPattern.EndsWith("'"))
{
dr = new DataRequest();
dr.Data = cph.TrueOutcomeSubstitutionPattern;
DataRequestCache.Add(dr);
}
}
}
}
}