/// <summary>
/// Parses the Template with the given options.
/// </summary>
/// <param name="parsingOptions">A set of options.</param>
/// <returns></returns>
public static ExtendedParseInformation ParseWithOptions(ParserOptions parsingOptions)
{
if (parsingOptions == null)
{
throw new ArgumentNullException(nameof(parsingOptions));
}
if (parsingOptions.StreamFactory == null)
{
throw new ArgumentNullException(nameof(parsingOptions), "The given Stream is null");
}
var tokens = new Queue <TokenPair>(Tokenizer.Tokenize(parsingOptions.Template));
var inferredModel = new InferredTemplateModel();
var internalTemplate = Parse(tokens, parsingOptions, parsingOptions.WithModelInference ? inferredModel : null);
Func <IDictionary <string, object>, CancellationToken, Stream> template = (model, token) =>
{
var targetStream = parsingOptions.StreamFactory();
if (!targetStream.CanWrite)
{
throw new InvalidOperationException("The stream is ReadOnly");
}
using (var streamWriter = new StreamWriter(targetStream, parsingOptions.Encoding, BufferSize, true))
{
var context = new ContextObject
{
Value = model,
Key = "",
Options = parsingOptions,
CancellationToken = token
};
internalTemplate(streamWriter, context);
streamWriter.Flush();
}
return(targetStream);
};
var result = new ExtendedParseInformation
{
InferredModel = inferredModel,
ParsedTemplateWithCancellation = template
};
return(result);
}
private static Action <StreamWriter, ContextObject> HandleFormattingValue(
TokenPair currentToken,
ParserOptions options,
InferredTemplateModel scope)
{
return((builder, context) =>
{
scope = scope?.GetInferredModelForPath(currentToken.Value, InferredTemplateModel.UsedAs.Scalar);
if (context == null)
{
return;
}
var c = context.GetContextForPath(currentToken.Value, true);
context.FormattingValue = c.Format(currentToken.FormatAs, c.Value);
});
}
private static Action <StreamWriter, ContextObject> PrintFormattedValues(
TokenPair currentToken,
ParserOptions options,
InferredTemplateModel currentScope)
{
return((builder, context) =>
{
if (context == null)
{
return;
}
string value = null;
if (context.FormattingValue != null)
{
value = context.FormattingValue.ToString();
context.FormattingValue = null;
}
HandleContent(value)(builder, context);
});
}
private static Action <StreamWriter, ContextObject> HandleSingleValue(TokenPair token, ParserOptions options,
InferredTemplateModel scope)
{
scope = scope?.GetInferredModelForPath(token.Value, InferredTemplateModel.UsedAs.Scalar);
return((builder, context) =>
{
//try to locate the value in the context, if it exists, append it.
var c = context?.GetContextForPath(token.Value);
if (c?.Value != null)
{
if (token.Type == TokenType.EscapedSingleValue && !options.DisableContentEscaping)
{
HandleContent(RtfEncodeString(c.ToString(), options))(builder, c);
}
else
{
HandleContent(c.ToString())(builder, c);
}
}
});
}
private InferredTemplateModel GetContextForPath(Queue <String> elements)
{
var retval = this;
if (elements.Any())
{
var element = elements.Dequeue();
if (element.StartsWith(".."))
{
if (Parent != null)
{
retval = Parent.GetContextForPath(elements);
}
else
{
//Calling "../" too much may be "ok" in that if we're at root,
//we may just stop recursion and traverse down the path.
retval = GetContextForPath(elements);
}
}
//TODO: handle array accessors and maybe "special" keys.
else
{
//ALWAYS return the context, even if the value is null.
InferredTemplateModel innerContext = null;
if (!Children.TryGetValue(element, out innerContext))
{
innerContext = new InferredTemplateModel();
innerContext.Key = element;
innerContext.Parent = this;
Children[element] = innerContext;
}
retval = innerContext.GetContextForPath(elements);
}
}
return(retval);
}
private static Action <StreamWriter, ContextObject> Parse(Queue <TokenPair> tokens, ParserOptions options,
InferredTemplateModel currentScope = null)
{
var buildArray = new List <Action <StreamWriter, ContextObject> >();
while (tokens.Any())
{
var currentToken = tokens.Dequeue();
switch (currentToken.Type)
{
case TokenType.Comment:
break;
case TokenType.Content:
buildArray.Add(HandleContent(currentToken.Value));
break;
case TokenType.CollectionOpen:
buildArray.Add(HandleCollectionOpen(currentToken, tokens, options, currentScope));
break;
case TokenType.ElementOpen:
buildArray.Add(HandleElementOpen(currentToken, tokens, options, currentScope));
break;
case TokenType.InvertedElementOpen:
buildArray.Add(HandleInvertedElementOpen(currentToken, tokens, options, currentScope));
break;
case TokenType.CollectionClose:
case TokenType.ElementClose:
// This should immediately return if we're in the element scope,
// and if we're not, this should have been detected by the tokenizer!
return((builder, context) =>
{
foreach (var a in buildArray.TakeWhile(e => StopOrAbortBuilding(context)))
{
a(builder, context);
}
});
case TokenType.Format:
buildArray.Add(HandleFormattingValue(currentToken, options, currentScope));
break;
case TokenType.PrintFormatted:
buildArray.Add(PrintFormattedValues(currentToken, options, currentScope));
break;
case TokenType.PrintSelf:
buildArray.Add(HandleSingleValue(currentToken, options, currentScope));
break;
case TokenType.EscapedSingleValue:
case TokenType.UnescapedSingleValue:
buildArray.Add(HandleSingleValue(currentToken, options, currentScope));
break;
}
}
return((builder, context) =>
{
foreach (var a in buildArray.TakeWhile(e => StopOrAbortBuilding(context)))
{
a(builder, context);
}
});
}
private static Action <StreamWriter, ContextObject> HandleCollectionOpen(TokenPair token, Queue <TokenPair> remainder,
ParserOptions options, InferredTemplateModel scope)
{
scope = scope?.GetInferredModelForPath(token.Value, InferredTemplateModel.UsedAs.Collection);
var innerTemplate = Parse(remainder, options, scope);
return((builder, context) =>
{
//if we're in the same scope, just negating, then we want to use the same object
var c = context.GetContextForPath(token.Value);
//"falsey" values by Javascript standards...
if (!c.Exists())
{
return;
}
if (c.Value is IEnumerable enumerable && !(enumerable is string) && !(enumerable is IDictionary <string, object>))
{
var index = 0;
var enumerator = enumerable.GetEnumerator();
if (enumerator.MoveNext())
{
var current = enumerator.Current;
object next;
do
{
if (enumerator.MoveNext())
{
next = enumerator.Current;
}
else
{
next = null;
}
var innerContext = new ContextCollection(index, next == null)
{
Value = current,
Key = string.Format("[{0}]", index),
Options = options,
Parent = c
};
innerTemplate(builder, innerContext);
index++;
current = next;
} while (current != null);
}
}
private static Action <StreamWriter, ContextObject> HandleInvertedElementOpen(TokenPair token,
Queue <TokenPair> remainder,
ParserOptions options, InferredTemplateModel scope)
{
scope = scope?.GetInferredModelForPath(token.Value, InferredTemplateModel.UsedAs.ConditionalValue);
var innerTemplate = Parse(remainder, options, scope);
return((builder, context) =>
{
var c = context.GetContextForPath(token.Value);
//"falsey" values by Javascript standards...
if (!c.Exists())
{
innerTemplate(builder, c);
}
});
}
