// helper method to wire Entityt -> Property -> ParseAction
private ParseAction Add(Entity entity, Property prop, ParseAction consume)
{
entity.Add(prop);
consume.Property = prop;
prop.Source = consume;
return(consume);
}
// just recurse and provide a ParseAction for the nested Expression
private ParseAction ImportGroupExpression(Expression exp,
Entity entity,
ParseAction parent = null,
bool optional = false)
{
return(this.ImportPropertiesAndParseActions(
((GroupExpression)exp).Expression, entity, parent, optional
));
}
private ParseAction ImportRepetitionExpression(Expression exp,
Entity entity,
ParseAction parent = null,
bool optional = false)
{
RepetitionExpression repetition = ((RepetitionExpression)exp);
// recurse down
ParseAction action = this.ImportPropertiesAndParseActions(
repetition.Expression, entity, parent, optional
);
// mark Plural
action.IsPlural = true;
return(action);
}
private ParseAction ImportOptionalExpression(Expression exp,
Entity entity,
ParseAction parent = null,
bool optional = false)
{
OptionalExpression option = ((OptionalExpression)exp);
// recurse down
ParseAction consume = this.ImportPropertiesAndParseActions(
option.Expression, entity, parent, true
);
// mark optional
consume.IsOptional = true;
return(consume);
}
private ParseAction ImportExtractorExpression(Expression exp,
Entity entity,
ParseAction parent = null,
bool optional = false)
{
ExtractorExpression extr = ((ExtractorExpression)exp);
return(this.Add(
entity,
new Property()
{
Name = extr.Name != null ? extr.Name : entity.Name
},
new ConsumePattern()
{
Pattern = extr.Pattern, Parent = parent
}
));
}
private ParseAction ImportAlternativesExpression(Expression exp,
Entity entity,
ParseAction parent = null,
bool optional = false)
{
AlternativesExpression alternative = ((AlternativesExpression)exp);
ConsumeAny consume = new ConsumeAny()
{
Parent = parent
};
// AlternativesExpression is constructed recusively, unroll it...
while (true)
{
// add first part
consume.Actions.Add(this.ImportPropertiesAndParseActions(
alternative.NonAlternativesExpression, entity, consume, optional
));
// add remaining parts
if (alternative.Expression is NonAlternativesExpression)
{
// last part
consume.Actions.Add(this.ImportPropertiesAndParseActions(
alternative.Expression, entity, consume, optional
));
break;
}
else
{
// recurse
alternative =
(AlternativesExpression)alternative.Expression;
}
}
return(consume);
}
private ParseAction ImportSequentialExpression(Expression exp,
Entity entity,
ParseAction parent = null,
bool optional = false)
{
SequentialExpression sequence = ((SequentialExpression)exp);
ConsumeAll consume = new ConsumeAll()
{
Parent = parent
};
// SequentialExpression is constructed recusively, unroll it...
while (true)
{
// add first part
consume.Actions.Add(this.ImportPropertiesAndParseActions(
sequence.AtomicExpression, entity, consume, optional
));
// add remaining parts
if (sequence.NonAlternativesExpression is AtomicExpression)
{
// last part
consume.Actions.Add(this.ImportPropertiesAndParseActions(
sequence.NonAlternativesExpression, entity, consume, optional
));
break;
}
else
{
// recurse
sequence = (SequentialExpression)sequence.NonAlternativesExpression;
}
}
return(consume);
}
private ParseAction ImportIdentifierExpression(Expression exp,
Entity entity,
ParseAction parent = null,
bool optional = false)
{
IdentifierExpression id = ((IdentifierExpression)exp);
if (!this.Model.Contains(id.Identifier))
{
throw new ModelException("Unknown Entity reference: " + id.Identifier);
}
return(this.Add(
entity,
new Property()
{
Name = id.Name != null ? id.Name : id.Identifier
},
new ConsumeEntity()
{
Reference = id.Identifier, Parent = parent
}
));
}
private ParseAction ImportPropertiesAndParseActions(Expression exp,
Entity entity,
ParseAction parent = null,
bool optional = false)
{
this.Log("ImportPropertiesAndParseActions(" + exp.GetType().ToString() + ")");
try {
return(new Dictionary <string, Func <Expression, Entity, ParseAction, bool, ParseAction> >()
{
{ "AlternativesExpression", this.ImportAlternativesExpression },
{ "SequentialExpression", this.ImportSequentialExpression },
{ "OptionalExpression", this.ImportOptionalExpression },
{ "RepetitionExpression", this.ImportRepetitionExpression },
{ "GroupExpression", this.ImportGroupExpression },
{ "IdentifierExpression", this.ImportIdentifierExpression },
{ "StringExpression", this.ImportStringExpression },
{ "ExtractorExpression", this.ImportExtractorExpression }
}[exp.GetType().ToString()](exp, entity, parent, optional));
} catch (KeyNotFoundException e) {
throw new NotImplementedException(
"Importing not implemented for " + exp.GetType().ToString(), e
);
}
}
private ParseAction ImportStringExpression(Expression exp,
Entity entity,
ParseAction parent = null,
bool optional = false)
{
StringExpression str = ((StringExpression)exp);
ParseAction consume = new ConsumeString()
{
String = str.String,
Parent = parent
};
// default behavior for String Consumption is to just do it, it must be
// done to have succesful parsing
// IF the string being parsed is within an optional context, we migt want
// to know IF it was parsed. So we create a property to store a flag to
// indicate whether the optional parse was successful or not.
// IF the StringExpression has an explicit Name (name @ string-expression)
// we _do_ create a property with that name.
// IF the StringExpression has an Alternatives Parent we behave as if we
// are optional.
if (parent is ConsumeAny)
{
optional = true;
}
// UNLESS the name is an underscore '_', then we don't create any Property
if (str.Name != null && str.Name.Equals("_"))
{
return(consume);
}
if (str.Name != null || optional)
{
if (optional)
{
consume.ReportSuccess = true;
}
string name = (str.Name != null ? str.Name : consume.Name);
// TODO improve and extract
if (name.Equals("-"))
{
name = "dash";
}
name = name.Replace("(", "open-bracket");
name = name.Replace(")", "close-bracket");
name = name.Replace("[", "open-square-bracket");
name = name.Replace("]", "close-square-bracket");
name = name.Replace("{", "open-brace");
name = name.Replace("}", "close-brace");
name = name.Replace(":", "colon");
name = name.Replace("=", "equals");
name = name.Replace("&", "ampersand");
name = name.Replace("<", "less-than");
name = name.Replace(">", "greater-than");
name = name.Replace("+", "plus");
name = name.Replace("*", "star");
name = name.Replace("!", "exclamation");
name = name.Replace(";", "semi-colon");
name = name.Replace(",", "comma");
name = name.Replace(".", "dot");
return(this.Add(
entity,
new Property()
{
Name = (optional ? "has-" : "") + name
},
consume
));
}
// a simple consumer of text, with no resulting information
return(consume);
}
