public IterationExpression(MustacheExpression expression)
{
Expression = expression;
}
public ConditionalExpression(MustacheExpression expression)
{
Expression = expression;
}
public MemberExpression(string name, MustacheExpression subExpression)
: this(name)
{
SubExpression = subExpression;
}
private PipelineFile <TObject> LoadFile <TObject, TConverter>(String path, IDictionary <String, Object> mustacheContext, CancellationToken cancellationToken, ref Int32 fileCount)
where TConverter : IYamlTypeConverter, new()
{
fileCount++;
if (m_options.MaxFiles > 0 && fileCount > m_options.MaxFiles)
{
throw new FormatException(TaskResources.YamlFileCount(m_options.MaxFiles));
}
cancellationToken.ThrowIfCancellationRequested();
FileData file = m_fileProvider.GetFile(path);
String mustacheReplaced;
StringReader reader = null;
CancellationTokenSource mustacheCancellationTokenSource = null;
try
{
// Read front-matter
IDictionary <String, Object> frontMatter = null;
reader = new StringReader(file.Content);
String line = reader.ReadLine();
if (!String.Equals(line, "---", StringComparison.Ordinal))
{
// No front-matter. Reset the reader.
reader.Dispose();
reader = new StringReader(file.Content);
}
else
{
// Deseralize front-matter.
cancellationToken.ThrowIfCancellationRequested();
StringBuilder frontMatterBuilder = new StringBuilder();
while (true)
{
line = reader.ReadLine();
if (line == null)
{
throw new FormatException(TaskResources.YamlFrontMatterNotClosed(path));
}
else if (String.Equals(line, "---", StringComparison.Ordinal))
{
break;
}
else
{
frontMatterBuilder.AppendLine(line);
}
}
var frontMatterDeserializer = new Deserializer();
try
{
frontMatter = frontMatterDeserializer.Deserialize <IDictionary <String, Object> >(frontMatterBuilder.ToString());
}
catch (Exception ex)
{
throw new FormatException(TaskResources.YamlFrontMatterNotValid(path, ex.Message), ex);
}
}
// Merge the mustache replace context.
frontMatter = frontMatter ?? new Dictionary <String, Object>();
if (mustacheContext != null)
{
foreach (KeyValuePair <String, Object> pair in mustacheContext)
{
frontMatter[pair.Key] = pair.Value;
}
}
// Prepare the mustache options.
mustacheCancellationTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
// var mustacheOptions = new MustacheEvaluationOptions
// {
// CancellationToken = mustacheCancellationTokenSource.Token,
// EncodeMethod = MustacheEncodeMethods.JsonEncode,
// MaxResultLength = m_options.MustacheEvaluationMaxResultLength,
// };
// Parse the mustache template.
cancellationToken.ThrowIfCancellationRequested();
var mustacheParser = new MustacheTemplateParser(useDefaultHandlebarHelpers: true, useCommonTemplateHelpers: true);
MustacheExpression mustacheExpression = mustacheParser.Parse(template: reader.ReadToEnd());
// Limit the mustache evaluation time.
if (m_options.MustacheEvaluationTimeout > TimeSpan.Zero)
{
mustacheCancellationTokenSource.CancelAfter(m_options.MustacheEvaluationTimeout);
}
try
{
// Perform the mustache evaluation.
mustacheReplaced = mustacheExpression.Evaluate(
replacementObject: frontMatter,
additionalEvaluationData: null,
parentContext: null,
partialExpressions: null
//options: mustacheOptions
);
}
catch (System.OperationCanceledException ex) when(mustacheCancellationTokenSource.IsCancellationRequested && !cancellationToken.IsCancellationRequested)
{
throw new System.OperationCanceledException(TaskResources.MustacheEvaluationTimeout(path, m_options.MustacheEvaluationTimeout.TotalSeconds), ex);
}
m_trace.Verbose("{0}", new TraceFileContent($"{file.Name} after mustache replacement", mustacheReplaced));
}
finally
{
reader?.Dispose();
reader = null;
mustacheCancellationTokenSource?.Dispose();
mustacheCancellationTokenSource = null;
}
// Deserialize
DeserializerBuilder deserializerBuilder = new DeserializerBuilder();
deserializerBuilder.WithTypeConverter(new TConverter());
Deserializer deserializer = deserializerBuilder.Build();
TObject obj = deserializer.Deserialize <TObject>(mustacheReplaced);
m_trace.Verbose("{0}", new TraceObject <TObject, TConverter>($"{file.Name} after deserialization ", obj));
var result = new PipelineFile <TObject> {
Name = file.Name, Directory = file.Directory, Object = obj
};
return(result);
}
public UnconvertedExpression(MustacheExpression expression)
{
Expression = expression;
}
