possible serialization issue

[giacomociti]

the following rule works fine in the browser but gives no result using node.

@prefix : <http://ex.org/> .
@prefix log: <http://www.w3.org/2000/10/swap/log#> .

:a :b :c, :d .

{
    (?x
     {:a :b ?x }
     ?list) log:collectAllIn _:x .
}
=>
{
  :result :is ?list
} .

Apparently, its serialization in the temporary file is missing {:a :b ?x }

<http://ex.org/a> <http://ex.org/b> <http://ex.org/c> . 
<http://ex.org/a> <http://ex.org/b> <http://ex.org/d> . 

{
 _:n3-1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> ?x . 
 _:n3-1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> _:n3-3 . 
 _:n3-1 <http://www.w3.org/2000/10/swap/log#collectAllIn> _:n3-0.x . 
 _:n3-3 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> ?list . 
 _:n3-3 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> <http://www.w3.org/1999/02/22-rdf-syntax-ns#nil> . 
 } => {<http://ex.org/result> <http://ex.org/is> ?list . } . 

[jeswr]

the following rule works fine in the browser but gives no result using node.

I'm assuming that if you use strings in node it works fine but if you give RDF/JS input and request string output then you get this problem?

[jeswr]

The fix should be easy - we just need the same logic as

eye-js/lib/n3Writer.temp.ts

Lines 26 to 28 in 3b2e074

	if (isQuoted(entity, store)) {
	return `{${this.quadsStoreToString(store, entity)}}`
	}

in the _encodePredicate method in lib/n3Writer.temp.ts.

Could you make a PR with the changes?

[giacomociti]

the following rule works fine in the browser but gives no result using node.

I'm assuming that if you use strings in node it works fine but if you give RDF/JS input and request string output then you get this problem?

exactly

[giacomociti]

Actually, I think the problem is not in eye-js but in the N3 parser:

import { Parser } from 'n3'

const text = `
@prefix : <http://ex.org/> .
@prefix log: <http://www.w3.org/2000/10/swap/log#> .

:a :b :c, :d .

{
    (?x {:a :b ?x } ?list) log:collectAllIn _:x .
}
=>
{
  :result :is ?list
} .
`
const quads = new Parser({ format: 'text/n3' }).parse(text)
console.log(quads.map(x => `${x.subject.value} ${x.predicate.value} ${x.object.value} ${x.graph.value}`))

// 'http://ex.org/a http://ex.org/b http://ex.org/c ',
// 'http://ex.org/a http://ex.org/b http://ex.org/d ',
// 'n3-1 http://www.w3.org/1999/02/22-rdf-syntax-ns#first x n3-0',
// 'http://ex.org/a http://ex.org/b x n3-2',
// 'n3-1 http://www.w3.org/1999/02/22-rdf-syntax-ns#rest n3-3 n3-0',
// 'n3-3 http://www.w3.org/1999/02/22-rdf-syntax-ns#first list n3-0',
// 'n3-3 http://www.w3.org/1999/02/22-rdf-syntax-ns#rest http://www.w3.org/1999/02/22-rdf-syntax-ns#nil n3-0',
// 'n3-1 http://www.w3.org/2000/10/swap/log#collectAllIn n3-0.x n3-0',
// 'http://ex.org/result http://ex.org/is list n3-4',
// 'n3-0 http://www.w3.org/2000/10/swap/log#implies n3-4 '

here the list links n3-1 directly to n3-3,skipping n3-2

[giacomociti]

rdfjs/N3.js#342