/// <summary>
/// Process this instance.
/// </summary>
/// <returns>The result.</returns>
public async Task <IDocumentResult> ProcessAsync()
{
var markdownResult = new MarkdownResult(DocumentIdentifier);
var tr = new StringReader(_content);
int? frontMatterStart = null;
int? frontMatterEnd = null;
string line;
var counter = -1;
var meta = new StringBuilder();
var body = new StringBuilder();
while ((line = await tr.ReadLineAsync().ConfigureAwait(false)) != null)
{
counter++;
if (line.Equals("---", StringComparison.OrdinalIgnoreCase))
{
if (!frontMatterStart.HasValue)
{
frontMatterStart = counter;
continue;
}
if (!frontMatterEnd.HasValue)
{
frontMatterEnd = counter;
continue;
}
}
// push to meta
if (frontMatterStart.HasValue &&
!frontMatterEnd.HasValue)
{
meta.AppendLine(line);
}
// push to body
else if (frontMatterStart.HasValue &&
frontMatterEnd.HasValue)
{
body.AppendLine(line);
}
}
// check structure
if (frontMatterStart.HasValue &&
!frontMatterEnd.HasValue)
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, "Invalid front matter. There is a starting tag --- that is not closed.");
}
// no front matter
if (!frontMatterStart.HasValue &&
!frontMatterEnd.HasValue)
{
body = new StringBuilder(_content);
}
markdownResult.FrontMatterType = meta.ToString().ToFrontMatterType();
markdownResult.Content = body.ToString();
IDeserializer des = null;
if (markdownResult.FrontMatterType == Enums.FrontMatterType.Yaml)
{
des = new Yaml();
}
if (markdownResult.FrontMatterType == Enums.FrontMatterType.Json)
{
des = new Json();
}
if (des != null)
{
try
{
markdownResult.Meta = des.Deserialize(meta.ToString());
}
catch
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, "Document parsing error.");
}
}
markdownResult.Date = _date;
markdownResult.Draft = _draft ?? false;
ProcessMeta(markdownResult, DocumentIdentifier.DocumentType);
if (DocumentIdentifier.DocumentType == Enums.DocumentType.Data)
{
markdownResult.Date = DateTime.MinValue.Date;
markdownResult.Slug = null;
}
if (DocumentIdentifier.DocumentType == Enums.DocumentType.Content &&
markdownResult.Date == null)
{
markdownResult.Date = DateTime.MinValue;
}
markdownResult.Hash = markdownResult.ToHash();
return(markdownResult);
}
/// <summary>
/// Processes the meta.
/// </summary>
/// <param name="result">Result.</param>
void ProcessMeta(MarkdownResult result, Enums.DocumentType documentType)
{
var expando = new ExpandoObject();
var originalExpando = new ExpandoObject();
IDictionary <string, object> dictionary = expando;
IDictionary <string, object> originalDictionary = originalExpando;
JObject metaObj = null;
if (result.Meta != null)
{
metaObj = JObject.FromObject(result.Meta);
}
Dictionary <string, object> meta = metaObj?.ToObject <Dictionary <string, object> >();
var usedPropertyTypes = new List <Enums.DocumentPropertyType>();
if (meta != null)
{
foreach (var key in meta.Keys)
{
var dpt = key.ToDocumentPropertyType();
if (dpt == Enums.DocumentPropertyType.Invalid)
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, $"Document parsing error. Property {key} is not recognized.");
}
if (dpt == Enums.DocumentPropertyType.Date)
{
if (documentType == Enums.DocumentType.Data)
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, $"$Date is not allowed for data documents.");
}
if (usedPropertyTypes.Any(x => x == Enums.DocumentPropertyType.Date))
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, $"Document parsing error. Property {key} is used more than once.");
}
if (meta[key].GetType() != typeof(string) &&
meta[key].GetType() != typeof(DateTime))
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, $"$Date is not valid string/date.");
}
result.Date = meta[key].ToString().ToDateTime();
usedPropertyTypes.Add(Enums.DocumentPropertyType.Date);
}
if (dpt == Enums.DocumentPropertyType.Slug)
{
if (documentType == Enums.DocumentType.Data)
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, $"$Slug is not allowed for data documents.");
}
if (usedPropertyTypes.Any(x => x == Enums.DocumentPropertyType.Slug))
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, $"Document parsing error. Property {key} is used more than once.");
}
if (meta[key].GetType() != typeof(string))
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, $"$Slug is not valid string.");
}
if (!meta[key].ToString().IsValidSlug())
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, $"$Slug is not valid.");
}
result.Slug = meta[key].ToString();
usedPropertyTypes.Add(Enums.DocumentPropertyType.Slug);
}
if (dpt == Enums.DocumentPropertyType.Draft)
{
if (documentType == Enums.DocumentType.Data)
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, $"$Draft is not allowed for data documents.");
}
if (usedPropertyTypes.Any(x => x == Enums.DocumentPropertyType.Draft))
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, $"Document parsing error. Property {key} is used more than once.");
}
if (meta[key].GetType() != typeof(bool))
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, $"$Draft is not valid boolean.");
}
result.Draft = (bool)meta[key];
usedPropertyTypes.Add(Enums.DocumentPropertyType.Draft);
}
if (dpt == Enums.DocumentPropertyType.UserDefined)
{
var newKey = key.ToCamelCase();
if (!dictionary.ContainsKey(newKey))
{
dictionary.Add(newKey, meta[key]);
}
else
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, $"Document parsing error. Property {key} is used more than once.");
}
}
}
// set original meta
foreach (var key in dictionary.Keys)
{
originalDictionary.Add(key, dictionary[key]);
}
if (_transformation != null)
{
foreach (var t in _transformation.Transformations)
{
var from = t.From.ToCamelCase();
var to = t.To.ToCamelCase();
var dtpFrom = t.From.ToDocumentPropertyType();
var dtpTo = t.From.ToDocumentPropertyType();
if (dtpFrom == Enums.DocumentPropertyType.Invalid)
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, $"Transformation error. Property {t.From} is not valid for transformation (from).");
}
if (dtpTo == Enums.DocumentPropertyType.Invalid)
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, $"Transformation error. Property {t.From} is not valid for transformation (to).");
}
if (dtpTo != Enums.DocumentPropertyType.UserDefined)
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, $"Transformation error. Property {t.From} is not valid for transformation (to). Don't use system fields.");
}
if (!dictionary.ContainsKey(from))
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, $"Transformation error. Property {t.From} is not valid for transformation (to). Source doesn't exist in meta fields.");
}
var val = dictionary[from];
foreach (var p in t.Transformations)
{
var newVal = _transformation.Transform(from, val, p);
if (dictionary.ContainsKey(to))
{
dictionary[to] = newVal;
}
else
{
dictionary.Add(to, newVal);
}
val = newVal;
}
}
}
}
// no date, set min date
if (!result.Date.HasValue)
{
result.Date = DateTime.MinValue.Date;
}
// no slug, set from document identifier
if (documentType == Enums.DocumentType.Content &&
result.Slug == null)
{
if (!DocumentIdentifier.DocumentId.IsValidSlug())
{
throw new KotoriDocumentException(DocumentIdentifier.DocumentId, $"Document identifier {DocumentIdentifier.DocumentId} is not valid as a slug.");
}
result.Slug = DocumentIdentifier.DocumentId;
}
result.OriginalMeta = originalExpando;
result.Meta = expando;
}