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Visualises JavaScript, TypeScript and Flow codebases as meaningful and committable architecture diagrams
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JavaScript
/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @emails react-core
*/
;
// TODO: can we express this test with only public API?
const getNodeForCharacterOffset = require('../getNodeForCharacterOffset')
.default;
// Create node from HTML string
function createNode(html) {
const node = (getTestDocument() || document).createElement('div');
node.innerHTML = html;
return node;
}
function getTestDocument(markup) {
const doc = document.implementation.createHTMLDocument('');
doc.open();
doc.write(
markup ||
'<!doctype html><html><meta charset=utf-8><title>test doc</title>',
);
doc.close();
return doc;
}
// Check getNodeForCharacterOffset return value matches expected result.
function expectNodeOffset(result, textContent, nodeOffset) {
expect(result.node.textContent).toBe(textContent);
expect(result.offset).toBe(nodeOffset);
}
describe('getNodeForCharacterOffset', () => {
it('should handle siblings', () => {
const node = createNode('<i>123</i><i>456</i><i>789</i>');
expectNodeOffset(getNodeForCharacterOffset(node, 0), '123', 0);
expectNodeOffset(getNodeForCharacterOffset(node, 4), '456', 1);
});
it('should handle trailing chars', () => {
const node = createNode('<i>123</i><i>456</i><i>789</i>');
expectNodeOffset(getNodeForCharacterOffset(node, 3), '123', 3);
expectNodeOffset(getNodeForCharacterOffset(node, 9), '789', 3);
});
it('should handle trees', () => {
const node = createNode(
'<i>' +
'<i>1</i>' +
'<i>' +
'<i>' +
'<i>2</i>' +
'<i></i>' +
'</i>' +
'</i>' +
'<i>' +
'3' +
'<i>45</i>' +
'</i>' +
'</i>',
);
expectNodeOffset(getNodeForCharacterOffset(node, 3), '3', 1);
expectNodeOffset(getNodeForCharacterOffset(node, 5), '45', 2);
expect(getNodeForCharacterOffset(node, 10)).toBeUndefined();
});
it('should handle non-existent offset', () => {
const node = createNode('<i>123</i>');
expect(getNodeForCharacterOffset(node, -1)).toBeUndefined();
expect(getNodeForCharacterOffset(node, 4)).toBeUndefined();
});
});