Support comma-separated selectors - break down into individual items when weaving

[KillyMXI]

The input

const selectorValuePairs = [
  ['foo,bar', 'A'],
  ['bar,baz', 'B']
];

should be equivalent to

const selectorValuePairs = [
  ['foo', 'A'],
  ['bar', 'A'],
  ['bar', 'B'],
  ['baz', 'B']
];

Code location:

selderee/packages/selderee/src/DecisionTree.ts

Lines 59 to 74 in f8d12f9

	function toAstTerminalPairs<V>(array: [string, V][]): AstTerminalPair<V>[] {
	const len = array.length;
	const results = new Array(len) as AstTerminalPair<V>[];
	for (let i = 0; i < len; i++) {
	const [selectorString, val] = array[i];
	const ast = preprocess(parseley.parse1(selectorString));
	results[i] = {
	ast: ast,
	terminal: {
	type: 'terminal',
	valueContainer: { index: i, value: val, specificity: ast.specificity }
	}
	};
	}
	return results;
	}

Instead of expecting exactly one result from parseley.parse1 - expect 1+ results from parseley.parse. Index has to increase for each parsed result rather than for each input array item.

The goal - more compact configuration for html-to-text package by allowing to group selectors that are treated in the same way (headings, blocks).