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+/*
+ * Copyright (C) 2020 Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+const fs = require('fs');
+const path = require('path');
+const assert = require('assert');
+const {JSDOM} = require('jsdom');
+const {VM} = require('./yomichan-vm');
+
+
+function createJSDOM(fileName) {
+ const domSource = fs.readFileSync(fileName, {encoding: 'utf8'});
+ return new JSDOM(domSource);
+}
+
+function querySelectorTextNode(element, selector) {
+ let textIndex = -1;
+ const match = /::text$|::nth-text\((\d+)\)$/.exec(selector);
+ if (match !== null) {
+ textIndex = (match[1] ? parseInt(match[1], 10) - 1 : 0);
+ selector = selector.substring(0, selector.length - match[0].length);
+ }
+ const result = element.querySelector(selector);
+ if (textIndex < 0) {
+ return result;
+ }
+ for (let n = result.firstChild; n !== null; n = n.nextSibling) {
+ if (n.nodeType === n.constructor.TEXT_NODE) {
+ if (textIndex === 0) {
+ return n;
+ }
+ --textIndex;
+ }
+ }
+ return null;
+}
+
+
+function getComputedFontSizeInPixels(window, getComputedStyle, element) {
+ for (; element !== null; element = element.parentNode) {
+ if (element.nodeType === window.Node.ELEMENT_NODE) {
+ const fontSize = getComputedStyle(element).fontSize;
+ if (fontSize.endsWith('px')) {
+ const value = parseFloat(fontSize.substring(0, fontSize.length - 2));
+ return value;
+ }
+ }
+ }
+ const defaultFontSize = 14;
+ return defaultFontSize;
+}
+
+function createAbsoluteGetComputedStyle(window) {
+ // Wrapper to convert em units to px units
+ const getComputedStyleOld = window.getComputedStyle.bind(window);
+ return (element, ...args) => {
+ const style = getComputedStyleOld(element, ...args);
+ return new Proxy(style, {
+ get: (target, property) => {
+ let result = target[property];
+ if (typeof result === 'string') {
+ result = result.replace(/([-+]?\d(?:\.\d)?(?:[eE][-+]?\d+)?)em/g, (g0, g1) => {
+ const fontSize = getComputedFontSizeInPixels(window, getComputedStyleOld, element);
+ return `${parseFloat(g1) * fontSize}px`;
+ });
+ }
+ return result;
+ }
+ });
+ };
+}
+
+
+async function testDomTextScanner(dom, {DOMTextScanner}) {
+ const document = dom.window.document;
+ for (const testElement of document.querySelectorAll('y-test')) {
+ let testData = JSON.parse(testElement.dataset.testData);
+ if (!Array.isArray(testData)) {
+ testData = [testData];
+ }
+ for (const testDataItem of testData) {
+ let {
+ node,
+ offset,
+ length,
+ forcePreserveWhitespace,
+ generateLayoutContent,
+ reversible,
+ expected: {
+ node: expectedNode,
+ offset: expectedOffset,
+ content: expectedContent
+ }
+ } = testDataItem;
+
+ node = querySelectorTextNode(testElement, node);
+ expectedNode = querySelectorTextNode(testElement, expectedNode);
+
+ // Standard test
+ {
+ const scanner = new DOMTextScanner(node, offset, forcePreserveWhitespace, generateLayoutContent);
+ scanner.seek(length);
+
+ const {node: actualNode1, offset: actualOffset1, content: actualContent1} = scanner;
+ assert.strictEqual(actualContent1, expectedContent);
+ assert.strictEqual(actualOffset1, expectedOffset);
+ assert.strictEqual(actualNode1, expectedNode);
+ }
+
+ // Substring tests
+ for (let i = 1; i <= length; ++i) {
+ const scanner = new DOMTextScanner(node, offset, forcePreserveWhitespace, generateLayoutContent);
+ scanner.seek(length - i);
+
+ const {content: actualContent} = scanner;
+ assert.strictEqual(actualContent, expectedContent.substring(0, expectedContent.length - i));
+ }
+
+ if (reversible === false) { continue; }
+
+ // Reversed test
+ {
+ const scanner = new DOMTextScanner(expectedNode, expectedOffset, forcePreserveWhitespace, generateLayoutContent);
+ scanner.seek(-length);
+
+ const {content: actualContent} = scanner;
+ assert.strictEqual(actualContent, expectedContent);
+ }
+
+ // Reversed substring tests
+ for (let i = 1; i <= length; ++i) {
+ const scanner = new DOMTextScanner(expectedNode, expectedOffset, forcePreserveWhitespace, generateLayoutContent);
+ scanner.seek(-(length - i));
+
+ const {content: actualContent} = scanner;
+ assert.strictEqual(actualContent, expectedContent.substring(i));
+ }
+ }
+ }
+}
+
+
+async function testDocument1() {
+ const dom = createJSDOM(path.join(__dirname, 'data', 'html', 'test-dom-text-scanner.html'));
+ const window = dom.window;
+ try {
+ const {document, Node, Range} = window;
+
+ window.getComputedStyle = createAbsoluteGetComputedStyle(window);
+
+ const vm = new VM({document, window, Range, Node});
+ vm.execute('fg/js/dom-text-scanner.js');
+ const DOMTextScanner = vm.get('DOMTextScanner');
+
+ await testDomTextScanner(dom, {DOMTextScanner});
+ } finally {
+ window.close();
+ }
+}
+
+
+async function main() {
+ await testDocument1();
+}
+
+
+if (require.main === module) { main(); }