fontoxpath/test/specs/parsing/VarRef.tests.js

A minimalistic XPath 3.1 engine in JavaScript

import * as slimdom from 'slimdom';

import {
	evaluateXPathToBoolean,
	evaluateXPathToString,
	evaluateXPathToNumber,
	evaluateXPathToFirstNode
} from 'fontoxpath';

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

describe('varRef', () => {
	it('can reference "let" variables more than once',
		() => chai.assert.equal(
			evaluateXPathToNumber('let $x := (1,2,3,4,5,6) return count($x) + count(reverse($x)) (: If this resolves with 8, it signals a double iteration of the same sequence :)'),
			12
		));
	it('can reference "function parameters" variables more than once',
		() => chai.assert.equal(
			evaluateXPathToNumber('function ($x as item()*) {count($x) + count(reverse($x))}((1,2,3,4,5,6)) (: If this resolves with 8, it signals a double iteration of the same sequence :)'),
			12
		));

	describe('external variables', () => {
		it('can reference variables: numerical',
			() => chai.assert.equal(evaluateXPathToNumber('$x', documentNode, null, { x: 42 }), 42));
		it('can reference variables: maps',
			() => chai.assert.equal(evaluateXPathToNumber('$x("a")', documentNode, null, { x: { a: 1 } }), 1));
		it('can reference variables: nodes',
			() => chai.assert.equal(evaluateXPathToFirstNode('$x("a")/self::node()', documentNode, null, { x: { a: documentNode } }), documentNode));

		it('can reference variables: arrays',
			() => chai.assert.equal(evaluateXPathToString('$x(1)', documentNode, null, { x: ['a', 'b', 'c'] }), 'a'));
		it('can reference variables: mixed maps and arrays',
			() => chai.assert.equal(evaluateXPathToNumber('$x(1)("a")', documentNode, null, { x: [{ 'a': 123 }] }), 123));
		it('can reference variables: maps with null values',
			() => chai.assert.isTrue(evaluateXPathToBoolean('$x("x") => empty()', documentNode, null, { x: { x: null } })));
		it('can reference variables: maps with undefined values (undefined means absent)',
			() => chai.assert.isTrue(evaluateXPathToBoolean('$x("x") => empty()', documentNode, null, { x: { x: undefined } })));
		it('can reference variables: arrays with null values',
			() => chai.assert.isTrue(evaluateXPathToBoolean('$x(1) => empty()', documentNode, null, { x: [ null ] })));
		it('can reference variables: arrays with undefined values (undefined means null)',
			() => chai.assert.isTrue(evaluateXPathToBoolean('$x(1) => empty()', documentNode, null, { x: [ undefined ] })));

		it('can reference variables: ',
			() => chai.assert.equal(evaluateXPathToNumber('$x(1)("a")', documentNode, null, { x: [{ 'a': 123 }] }), 123));
		it('can reference built-in variables',
			() => chai.assert.deepEqual(evaluateXPathToString('$theBest', documentNode), 'FontoXML is the best!'));

		it('does not mutate to the external variables object', () => {
			const variables = { a: 1 };
			evaluateXPathToString('()', documentNode, undefined, variables);
			chai.assert.deepEqual(variables, { a: 1 }, 'The passed variables should not be mutated.');
		});
	});
});