stringToN3 uses invalid delimiter for literals that contain quotes or newlines.

[RinkeHoekstra]

The serializer to NQuads (and turtle and others) uses the stringToN3 function to convert the value of a string literal to a safe string in the output syntax.

However, the code uses the triple quote """ as delimiter for strings that contain a newline or a quote " character:

rdflib.js/src/serializer.js

Lines 584 to 589 in cfc0f8c

	if (str.length > 20 && // Long enough to make sense
	str.slice(-1) !== '"' && // corner case'
	flags.indexOf('n') < 0 && // Force single line
	(str.indexOf('\n') > 0 || str.indexOf('"') > 0)) {
	delim = '"""'
	forbidden = this.forbidden3

This is not a valid serialization for NQuads, see the literal production grammar:

https://www.w3.org/TR/n-quads/#grammar-production-literal

The stringToN3 function should use the normal escaping using a backslash, i.e. \n and \".

[bourgeoa]

Thanks. Please propose a non regressive PR

[RinkeHoekstra]

Apologies for the delay, @bourgeoa I created a pull request #652. Turns out it was a very small fix.