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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,
remainder: expectedRemainder
}
} = 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, remainder: actualRemainder1} = scanner;
assert.strictEqual(actualContent1, expectedContent);
assert.strictEqual(actualOffset1, expectedOffset);
assert.strictEqual(actualNode1, expectedNode);
assert.strictEqual(actualRemainder1, expectedRemainder || 0);
}
// 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(); }
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