fontoxpath/test/specs/parsing/axes/AttributeAxis.tests.js

A minimalistic XPath 3.1 engine in JavaScript

import * as slimdom from 'slimdom';

import {
	evaluateXPathToStrings,
	evaluateXPathToString,
	evaluateXPathToBoolean
} from 'fontoxpath';

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

describe('attribute', () => {
	it('parses attribute existence', () => {
		const element = documentNode.createElement('someElement');
		element.setAttribute('someAttribute', 'someValue');
		chai.assert.equal(evaluateXPathToString('attribute::someAttribute', element), 'someValue');
	});

	it('returns no attributes for documents',
		() => chai.assert.equal(evaluateXPathToString('attribute::someAttribute', documentNode), ''));

	it('returns no attributes for comments',
		() => chai.assert.equal(evaluateXPathToString('attribute::someAttribute', documentNode.createComment('some comment')), ''));

	it('returns no attributes for processing instructions',
		() => chai.assert.equal(evaluateXPathToString('attribute::someAttribute', documentNode.createProcessingInstruction('someTarget', 'some data')), ''));

	it('resolves to false if attribute is absent', () => {
		const element = documentNode.createElement('someElement');
		chai.assert.deepEqual(evaluateXPathToStrings('@someAttribute', element), []);
	});

	it('allows namespaces', () => {
		const element = documentNode.createElement('someElement');
		element.setAttributeNS('http://fontoxml.com/ns/', 'someNamespace:someAttribute', 'someValue');
		chai.assert.equal(evaluateXPathToString('attribute::someNamespace:someAttribute', element, null, null, { namespaceResolver: () => 'http://fontoxml.com/ns/' }), 'someValue');
	});

	it('parses the shorthand for existence', () => {
		const element = documentNode.createElement('someElement');
		element.setAttribute('someAttribute', 'someValue');
		chai.assert.equal(evaluateXPathToString('@someAttribute', element), 'someValue');
	});

	it('parses the shorthand for value', () => {
		const element = documentNode.createElement('someElement');
		element.setAttribute('someAttribute', 'someValue');
		chai.assert.equal(evaluateXPathToString('@someAttribute=\'someValue\'', element), 'true');
	});

	it('allows namespaces in the shorthand', () => {
		const element = documentNode.createElement('someElement');
		element.setAttributeNS('http://fontoxml.com/ns/', 'someNamespace:someAttribute', 'someValue');
		chai.assert.equal(evaluateXPathToString('@someNamespace:someAttribute="someValue"', element, null, null, { namespaceResolver: () => 'http://fontoxml.com/ns/' }), 'true');
	});

	it('allows a wildcard as attribute name', () => {
		const element = documentNode.createElement('someElement');
		element.setAttribute('someAttribute1', 'someValue1');
		element.setAttribute('someAttribute2', 'someValue2');
		element.setAttribute('someAttribute3', 'someValue3');
		chai.assert.equal(evaluateXPathToString('string-join(@*/name(), ",")', element), 'someAttribute1,someAttribute2,someAttribute3');
	});

	it('allows a kindTest as attribute test', () => {
		const element = documentNode.createElement('someElement');
		element.setAttribute('someAttribute1', 'someValue1');
		element.setAttribute('someAttribute2', 'someValue2');
		element.setAttribute('someAttribute3', 'someValue3');
		chai.assert.equal(evaluateXPathToString('string-join(@node()/name(), ",")', element), 'someAttribute1,someAttribute2,someAttribute3');
	});

	it('sets the context sequence', () => {
		const element = documentNode.createElement('someElement');
		element.setAttribute('b', 'b');
		element.setAttribute('c', 'c');
		element.setAttribute('a', 'a');
		chai.assert.oneOf(evaluateXPathToString('@*[last()]/name()', element), ['a', 'b', 'c']);
	});

	it('does not contain namespace declarations', () => {
		const doc = (new window.DOMParser()).parseFromString('<someElement xmlns:ns="http://example.org/ns" ns:attr="someValue"/>', 'text/xml');
		chai.assert.isTrue(evaluateXPathToBoolean('@* => count() eq 1', doc.documentElement));
	});

	it('throws the correct error if context is absent', () => {
		chai.assert.throws(() => evaluateXPathToBoolean('@*', null), 'XPDY0002');
	});
});