protected string ReportErrorContext(IConceptInfo conceptInfo, TokenReader tokenReader)
{
var sb = new StringBuilder();
sb.AppendLine(tokenReader.ReportPosition());
if (conceptInfo != null)
{
sb.AppendFormat("Previous concept: {0}", conceptInfo.GetUserDescription()).AppendLine();
var properties = conceptInfo.GetType().GetProperties().ToList();
properties.ForEach(it =>
sb.AppendFormat("Property {0} ({1}) = {2}",
it.Name,
it.PropertyType.Name,
it.GetValue(conceptInfo, null) ?? "<null>")
.AppendLine());
}
return sb.ToString();
}
protected IConceptInfo ParseNextConcept(TokenReader tokenReader, Stack <IConceptInfo> context, IEnumerable <IConceptParser> conceptParsers)
{
var errors = new List <string>();
List <Interpretation> possibleInterpretations = new List <Interpretation>();
foreach (var conceptParser in conceptParsers)
{
TokenReader nextPosition = new TokenReader(tokenReader);
var conceptInfoOrError = conceptParser.Parse(nextPosition, context);
if (!conceptInfoOrError.IsError)
{
possibleInterpretations.Add(new Interpretation
{
ConceptInfo = conceptInfoOrError.Value,
NextPosition = nextPosition
});
}
else if (!string.IsNullOrEmpty(conceptInfoOrError.Error)) // Empty error means that this parser is not for this keyword.
{
errors.Add(string.Format("{0}: {1}\r\n{2}", conceptParser.GetType().Name, conceptInfoOrError.Error, tokenReader.ReportPosition()));
}
}
if (possibleInterpretations.Count == 0)
{
var nextToken = new TokenReader(tokenReader).ReadText(); // Peek, without changing the original tokenReader's position.
string keyword = nextToken.IsError ? null : nextToken.Value;
if (errors.Count > 0)
{
string errorsReport = string.Join("\r\n", errors).Limit(500, "...");
throw new DslSyntaxException($"Invalid parameters after keyword '{keyword}'. {tokenReader.ReportPosition()}\r\n\r\nPossible causes:\r\n{errorsReport}");
}
else if (!string.IsNullOrEmpty(keyword))
{
throw new DslSyntaxException($"Unrecognized concept keyword '{keyword}'. {tokenReader.ReportPosition()}");
}
else
{
throw new DslSyntaxException($"Invalid DSL script syntax. {tokenReader.ReportPosition()}");
}
}
int largest = possibleInterpretations.Max(i => i.NextPosition.PositionInTokenList);
possibleInterpretations.RemoveAll(i => i.NextPosition.PositionInTokenList < largest);
if (possibleInterpretations.Count > 1)
{
string msg = "Ambiguous syntax. " + tokenReader.ReportPosition()
+ "\r\n Possible interpretations: "
+ string.Join(", ", possibleInterpretations.Select(i => i.ConceptInfo.GetType().Name))
+ ".";
throw new DslSyntaxException(msg);
}
tokenReader.CopyFrom(possibleInterpretations.Single().NextPosition);
return(possibleInterpretations.Single().ConceptInfo);
}
protected IConceptInfo ParseNextConcept(TokenReader tokenReader, Stack <IConceptInfo> context, IEnumerable <IConceptParser> conceptParsers)
{
var errors = new List <string>();
List <Interpretation> possibleInterpretations = new List <Interpretation>();
foreach (var conceptParser in conceptParsers)
{
TokenReader nextPosition = new TokenReader(tokenReader);
var conceptInfoOrError = conceptParser.Parse(nextPosition, context);
if (!conceptInfoOrError.IsError)
{
possibleInterpretations.Add(new Interpretation
{
ConceptInfo = conceptInfoOrError.Value,
NextPosition = nextPosition
});
}
else if (!string.IsNullOrEmpty(conceptInfoOrError.Error)) // Empty error means that this parser is not for this keyword.
{
errors.Add(string.Format("{0}: {1}\r\n{2}", conceptParser.GetType().Name, conceptInfoOrError.Error, tokenReader.ReportPosition()));
}
}
if (possibleInterpretations.Count == 0)
{
string msg = "Unrecognized concept. " + tokenReader.ReportPosition();
if (errors.Count > 0)
{
string listedErrors = string.Join("\r\n", errors);
if (listedErrors.Length > 500)
{
listedErrors = listedErrors.Substring(0, 500) + "...";
}
msg = msg + "\r\n\r\nPossible causes:\r\n" + listedErrors;
}
throw new DslSyntaxException(msg);
}
int largest = possibleInterpretations.Max(i => i.NextPosition.PositionInTokenList);
possibleInterpretations.RemoveAll(i => i.NextPosition.PositionInTokenList < largest);
if (possibleInterpretations.Count > 1)
{
string msg = "Ambiguous syntax. " + tokenReader.ReportPosition()
+ "\r\n Possible interpretations: "
+ string.Join(", ", possibleInterpretations.Select(i => i.ConceptInfo.GetType().Name))
+ ".";
throw new DslSyntaxException(msg);
}
tokenReader.CopyFrom(possibleInterpretations.Single().NextPosition);
return(possibleInterpretations.Single().ConceptInfo);
}
protected string ReportErrorContext(IConceptInfo conceptInfo, TokenReader tokenReader)
{
var sb = new StringBuilder();
sb.AppendLine(tokenReader.ReportPosition());
if (conceptInfo != null)
{
sb.AppendFormat("Previous concept: {0}", conceptInfo.GetUserDescription()).AppendLine();
var properties = conceptInfo.GetType().GetProperties().ToList();
properties.ForEach(it =>
sb.AppendFormat("Property {0} ({1}) = {2}",
it.Name,
it.PropertyType.Name,
it.GetValue(conceptInfo, null) ?? "<null>")
.AppendLine());
}
return(sb.ToString());
}
protected void UpdateContextForNextConcept(TokenReader tokenReader, Stack <IConceptInfo> context, IConceptInfo conceptInfo)
{
if (tokenReader.TryRead("{"))
{
context.Push(conceptInfo);
}
else if (!tokenReader.TryRead(";"))
{
var sb = new StringBuilder();
sb.Append(ReportErrorContext(conceptInfo, tokenReader));
sb.Append("Expected \";\" or \"{\".");
throw new DslSyntaxException(sb.ToString());
}
while (tokenReader.TryRead("}"))
{
if (context.Count == 0)
{
throw new DslSyntaxException(tokenReader.ReportPosition() + "\r\nUnexpected \"}\". ");
}
context.Pop();
}
}
private (IConceptInfo ConceptInfo, List <string> Warnings) ParseNextConcept(TokenReader tokenReader, Stack <IConceptInfo> context, MultiDictionary <string, IConceptParser> conceptParsers)
{
var errorReports = new List <Func <(string formattedError, string simpleError)> >();
List <Interpretation> possibleInterpretations = new List <Interpretation>();
var keywordReader = new TokenReader(tokenReader).ReadText(); // Peek, without changing the original tokenReader's position.
var keyword = keywordReader.IsError ? null : keywordReader.Value;
_onKeyword?.Invoke(tokenReader, keyword);
if (keyword != null)
{
foreach (var conceptParser in conceptParsers.Get(keyword))
{
TokenReader nextPosition = new TokenReader(tokenReader);
var conceptInfoOrError = conceptParser.Parse(nextPosition, context, out var warnings);
if (!conceptInfoOrError.IsError)
{
possibleInterpretations.Add(new Interpretation
{
ConceptInfo = conceptInfoOrError.Value,
NextPosition = nextPosition,
Warnings = warnings
});
}
else if (!string.IsNullOrEmpty(conceptInfoOrError.Error)) // Empty error means that this parser is not for this keyword.
{
errorReports.Add(() =>
(string.Format("{0}: {1}\r\n{2}", conceptParser.GetType().Name, conceptInfoOrError.Error, tokenReader.ReportPosition()), conceptInfoOrError.Error));
}
}
}
if (possibleInterpretations.Count == 0)
{
var(dslScript, position) = tokenReader.GetPositionInScript();
if (errorReports.Count > 0)
{
var errorReportValues = errorReports.Select(x => x.Invoke()).ToList();
var errorsReport = string.Join("\r\n", errorReportValues.Select(x => x.formattedError)).Limit(500, "...");
var simpleErrorsReport = string.Join("\n", errorReportValues.Select(x => x.simpleError));
var simpleMessage = $"Invalid parameters after keyword '{keyword}'. Possible causes: {simpleErrorsReport}";
var possibleCauses = $"Possible causes:\r\n{errorsReport}";
throw new DslSyntaxException(simpleMessage, "RH0003", dslScript, position, 0, possibleCauses);
}
else if (!string.IsNullOrEmpty(keyword))
{
var simpleMessage = $"Unrecognized concept keyword '{keyword}'.";
throw new DslSyntaxException(simpleMessage, "RH0004", dslScript, position, 0, null);
}
else
{
var simpleMessage = $"Invalid DSL script syntax.";
throw new DslSyntaxException(simpleMessage, "RH0005", dslScript, position, 0, null);
}
}
Disambiguate(possibleInterpretations);
if (possibleInterpretations.Count > 1)
{
var interpretations = new List <string>();
for (int i = 0; i < possibleInterpretations.Count; i++)
{
interpretations.Add($"{i + 1}. {possibleInterpretations[i].ConceptInfo.GetType().AssemblyQualifiedName}");
}
var simpleMessage = $"Ambiguous syntax. There are multiple possible interpretations of keyword '{keyword}': {string.Join(", ", interpretations)}.";
var(dslScript, position) = tokenReader.GetPositionInScript();
throw new DslSyntaxException(simpleMessage, "RH0006", dslScript, position, 0, null);
}
var parsedStatement = possibleInterpretations.Single();
tokenReader.CopyFrom(parsedStatement.NextPosition);
return(parsedStatement.ConceptInfo, parsedStatement.Warnings);
}
protected IConceptInfo ParseNextConcept(TokenReader tokenReader, Stack <IConceptInfo> context, MultiDictionary <string, IConceptParser> conceptParsers)
{
var errorReports = new List <Func <string> >();
List <Interpretation> possibleInterpretations = new List <Interpretation>();
var keywordReader = new TokenReader(tokenReader).ReadText(); // Peek, without changing the original tokenReader's position.
var keyword = keywordReader.IsError ? null : keywordReader.Value;
if (keyword != null)
{
foreach (var conceptParser in conceptParsers.Get(keyword))
{
TokenReader nextPosition = new TokenReader(tokenReader);
var conceptInfoOrError = conceptParser.Parse(nextPosition, context);
if (!conceptInfoOrError.IsError)
{
possibleInterpretations.Add(new Interpretation
{
ConceptInfo = conceptInfoOrError.Value,
NextPosition = nextPosition
});
}
else if (!string.IsNullOrEmpty(conceptInfoOrError.Error)) // Empty error means that this parser is not for this keyword.
{
errorReports.Add(() => string.Format("{0}: {1}\r\n{2}", conceptParser.GetType().Name, conceptInfoOrError.Error, tokenReader.ReportPosition()));
}
}
}
if (possibleInterpretations.Count == 0)
{
if (errorReports.Count > 0)
{
string errorsReport = string.Join("\r\n", errorReports.Select(x => x.Invoke())).Limit(500, "...");
throw new DslSyntaxException($"Invalid parameters after keyword '{keyword}'. {tokenReader.ReportPosition()}\r\n\r\nPossible causes:\r\n{errorsReport}");
}
else if (!string.IsNullOrEmpty(keyword))
{
throw new DslSyntaxException($"Unrecognized concept keyword '{keyword}'. {tokenReader.ReportPosition()}");
}
else
{
throw new DslSyntaxException($"Invalid DSL script syntax. {tokenReader.ReportPosition()}");
}
}
int largest = possibleInterpretations.Max(i => i.NextPosition.PositionInTokenList);
possibleInterpretations.RemoveAll(i => i.NextPosition.PositionInTokenList < largest);
if (possibleInterpretations.Count > 1)
{
var report = new List <string>();
report.Add($"Ambiguous syntax. {tokenReader.ReportPosition()}");
report.Add($"There are multiple possible interpretations of keyword '{keyword}':");
for (int i = 0; i < possibleInterpretations.Count; i++)
{
report.Add($"{i + 1}. {possibleInterpretations[i].ConceptInfo.GetType().AssemblyQualifiedName}");
}
throw new DslSyntaxException(string.Join("\r\n", report));
}
tokenReader.CopyFrom(possibleInterpretations.Single().NextPosition);
return(possibleInterpretations.Single().ConceptInfo);
}
protected void UpdateContextForNextConcept(TokenReader tokenReader, Stack<IConceptInfo> context, IConceptInfo conceptInfo)
{
if (tokenReader.TryRead("{"))
context.Push(conceptInfo);
else if (!tokenReader.TryRead(";"))
{
var sb = new StringBuilder();
sb.Append(ReportErrorContext(conceptInfo, tokenReader));
sb.AppendFormat("Expected \";\" or \"{{\".");
throw new DslSyntaxException(sb.ToString());
}
while (tokenReader.TryRead("}"))
{
if (context.Count == 0)
throw new DslSyntaxException(tokenReader.ReportPosition() + "\r\nUnexpected \"}\". ");
context.Pop();
}
}
protected IConceptInfo ParseNextConcept(TokenReader tokenReader, Stack<IConceptInfo> context, IEnumerable<IConceptParser> conceptParsers)
{
var errors = new List<string>();
List<Interpretation> possibleInterpretations = new List<Interpretation>();
foreach (var conceptParser in conceptParsers)
{
TokenReader nextPosition = new TokenReader(tokenReader);
var conceptInfoOrError = conceptParser.Parse(nextPosition, context);
if (!conceptInfoOrError.IsError)
possibleInterpretations.Add(new Interpretation
{
ConceptInfo = conceptInfoOrError.Value,
NextPosition = nextPosition
});
else if (!string.IsNullOrEmpty(conceptInfoOrError.Error)) // Empty error means that this parser is not for this keyword.
errors.Add(string.Format("{0}: {1}\r\n{2}", conceptParser.GetType().Name, conceptInfoOrError.Error, tokenReader.ReportPosition()));
}
if (possibleInterpretations.Count == 0)
{
string msg = "Unrecognized concept. " + tokenReader.ReportPosition();
if (errors.Count > 0)
{
string listedErrors = string.Join("\r\n", errors);
if (listedErrors.Length > 500) listedErrors = listedErrors.Substring(0, 500) + "...";
msg = msg + "\r\n\r\nPossible causes:\r\n" + listedErrors;
}
throw new DslSyntaxException(msg);
}
int largest = possibleInterpretations.Max(i => i.NextPosition.PositionInTokenList);
possibleInterpretations.RemoveAll(i => i.NextPosition.PositionInTokenList < largest);
if (possibleInterpretations.Count > 1)
{
string msg = "Ambiguous syntax. " + tokenReader.ReportPosition()
+ "\r\n Possible interpretations: "
+ string.Join(", ", possibleInterpretations.Select(i => i.ConceptInfo.GetType().Name))
+ ".";
throw new DslSyntaxException(msg);
}
tokenReader.CopyFrom(possibleInterpretations.Single().NextPosition);
return possibleInterpretations.Single().ConceptInfo;
}