Pairs

[twalmsley]

Pairs

[elliottinvent]

This works:

a=(b=(c=(d=(e=f))))

So does this:

a=b=c=d=e=f

This doesn't work in the playground:

a=(b=c=d=e=f)

I suppose the question is whether the last example works in the grammar and if the parse tree is the same for all three examples.

If so, then this could be a job for @alexdalitz in the interpreter. If the final example is difficult to handle in the interpreter we could just call this known behaviour.

[twalmsley]

The first two examples work correctly in the java interpreter and the sandbox, but the third example fails in both. It gives this stack trace:

com.fasterxml.jackson.core.JsonGenerationException: Can not write a field name, expecting a value

	at com.fasterxml.jackson.core.JsonGenerator._reportError(JsonGenerator.java:1961)
	at com.fasterxml.jackson.core.json.WriterBasedJsonGenerator.writeFieldName(WriterBasedJsonGenerator.java:137)
	at uk.modl.parser.printers.ModlValueJsonSerializer.serializeInternal(ModlValueJsonSerializer.java:117)
	at uk.modl.parser.printers.ModlValueJsonSerializer.serializeInternal(ModlValueJsonSerializer.java:85)
	at uk.modl.parser.printers.ModlValueJsonSerializer.serializeInternal(ModlValueJsonSerializer.java:118)
	at uk.modl.parser.printers.ModlValueJsonSerializer.serializeInternal(ModlValueJsonSerializer.java:70)
	at uk.modl.parser.printers.ModlValueJsonSerializer.serializeInternal(ModlValueJsonSerializer.java:88)
	at uk.modl.parser.printers.ModlValueJsonSerializer.serializeInternal(ModlValueJsonSerializer.java:118)
	at uk.modl.parser.printers.ModlValueJsonSerializer.serializeInternal(ModlValueJsonSerializer.java:56)
	at uk.modl.parser.printers.ModlValueJsonSerializer.serializeInternal(ModlValueJsonSerializer.java:45)
	at uk.modl.parser.printers.ModlValueJsonSerializer.serializeStructure(ModlValueJsonSerializer.java:41)
	at uk.modl.parser.printers.ModlObjectJsonSerializer.serialize(ModlObjectJsonSerializer.java:41)
	at uk.modl.parser.printers.ModlObjectJsonSerializer.serialize(ModlObjectJsonSerializer.java:33)
	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480)
	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319)
	at com.fasterxml.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1396)
	at com.fasterxml.jackson.databind.ObjectWriter._configAndWriteValue(ObjectWriter.java:1120)
	at com.fasterxml.jackson.databind.ObjectWriter.writeValueAsString(ObjectWriter.java:993)
	at uk.modl.parser.printers.JsonPrinter.printModl(JsonPrinter.java:59)
	at uk.modl.parser.printers.JsonPrinter.printModl(JsonPrinter.java:34)

This is probably one for @alexdalitz (@elliottinvent can you reassign?)

[alexdalitz]

@elliottinvent what is your expected output in this case?

[elliottinvent]

@alexdalitz

a=(b=(c=(d=(e=f))))

and

a=b=c=d=e=f

Should ouput the same =>

{
    "a": {
        "b": {
            "c": {
                "d": {
                    "e": "f"
                }
            }
        }
    }
}

If the example below is difficult to handle in the interpreter then we could call it expected behaviour, but ideally it would output the same as the two other examples since it's effectively the same MODL structure, just expressed in a different way:

a=(b=c=d=e=f)

=>

{
    "a": {
        "b": {
            "c": {
                "d": {
                    "e": "f"
                }
            }
        }
    }
}

[alexdalitz]

This is now working