Bug: termFromId errors on deeply nested quads

[jeswr]

This test

N3.js/test/Term-test.js

Lines 211 to 213 in a8cd436

	it('should correctly handle deeply nested quads', () => {
	termFromId(DEEP_TRIPLE_STRING).should.equal(DEEP_TRIPLE);
	});

fails as termFromId does not handle nested quads. This is because this regex (

N3.js/src/N3DataFactory.js

Line 13 in e531951

const quadId = /^<<("(?:""|[^"])*"[^ ]*|[^ ]+) ("(?:""|[^"])*"[^ ]*|[^ ]+) ("(?:""|[^"])*"[^ ]*|[^ ]+) ?("(?:""|[^"])*"[^ ]*|[^ ]+)?>>$/;

) cannot handle one of the terms being a quad.

Trying to look into a fix but am struggling to get the regex for it right.

[RubenVerborgh]

am struggling to get the regex for it right

If the nesting is arbitrarily deep, no regex can capture it, so we'd need to actually parse.