fontoxpath/test/specs/parsing/operators/UnionOperator.tests.js

A minimalistic XPath 3.1 engine in JavaScript

import * as slimdom from 'slimdom';
import jsonMlMapper from 'test-helpers/jsonMlMapper';

import {
	evaluateXPathToNodes
} from 'fontoxpath';
import evaluateXPathToAsyncSingleton from 'test-helpers/evaluateXPathToAsyncSingleton';

let documentNode;
beforeEach(() => {
	documentNode = new slimdom.Document();
});

describe('union', () => {
	it('can parse union', () => {
		jsonMlMapper.parse([
			'someNode',
			['someChildNode']
		], documentNode);
		chai.assert.deepEqual(evaluateXPathToNodes('(//someNode | //someChildNode)', documentNode), [documentNode.firstChild, documentNode.firstChild.firstChild]);
	});

	it('allows union (|) without spaces', () => {
		jsonMlMapper.parse([
			'someNode',
			['someChildNode']
		], documentNode);
		chai.assert.deepEqual(evaluateXPathToNodes('(//someNode|//someChildNode)', documentNode), [documentNode.firstChild, documentNode.firstChild.firstChild]);
	});

	it('allows union over async sequences', async () => {
		jsonMlMapper.parse([
			'someNode',
			['someChildNode']
		], documentNode);
		chai.assert.equal(
			await evaluateXPathToAsyncSingleton(
				'((//someChildNode => fontoxpath:sleep(1)) | (//someNode => fontoxpath:sleep(2)))!local-name()!string() => string-join(",")',
				documentNode),
		'someNode,someChildNode');
	});

	it('allows union (written out) without spaces', () => {
		jsonMlMapper.parse([
			'someNode',
			['someChildNode']
		], documentNode);
		chai.assert.deepEqual(evaluateXPathToNodes('((//someNode)union(//someChildNode))', documentNode), [documentNode.firstChild, documentNode.firstChild.firstChild]);
	});

	it('dedupes nodes', () => {
		jsonMlMapper.parse([
			'someNode',
			['someChildNode']
		], documentNode);
		chai.expect(evaluateXPathToNodes('(//* | //*)', documentNode), [documentNode.firstChild, documentNode.firstChild.firstChild]);
	});

	it('throws an error when not passed a node sequence',
		() => chai.assert.throws(() => evaluateXPathToNodes('(1,2,3) | (4,5,6)', documentNode), 'XPTY0004'));

	it('sorts nodes', () => {
		jsonMlMapper.parse([
			'someNode',
			['A'],
			['B'],
			['C']
		], documentNode);
		chai.assert.deepEqual(evaluateXPathToNodes('(//C | //B | //A)', documentNode), Array.from(documentNode.firstChild.childNodes));
	});
});