1 files changed, 202 insertions, 0 deletions
diff --git a/dev/lint/html-scripts.js b/dev/lint/html-scripts.js
new file mode 100644
index 00000000..da8c2c71
--- /dev/null
+++ b/dev/lint/html-scripts.js
@@ -0,0 +1,202 @@
+/*
+ * Copyright (C) 2023  Yomitan Authors
+ * Copyright (C) 2020-2022  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 {getAllFiles} = require('../util');
+
+
+/**
+ * @param {string} fileName
+ * @returns {?fs.Stats}
+ */
+function lstatSyncSafe(fileName) {
+    try {
+        return fs.lstatSync(fileName);
+    } catch (e) {
+        return null;
+    }
+}
+
+/**
+ * @param {string} src
+ * @param {string} fileName
+ * @param {string} extDir
+ */
+function validatePath(src, fileName, extDir) {
+    assert.ok(typeof src === 'string', `<script> missing src attribute in ${fileName}`);
+    assert.ok(src.startsWith('/'), `<script> src attribute is not absolute in ${fileName} (src=${JSON.stringify(src)})`);
+    const relativeSrc = src.substring(1);
+    assert.ok(!path.isAbsolute(relativeSrc), `<script> src attribute is invalid in ${fileName} (src=${JSON.stringify(src)})`);
+    const fullSrc = path.join(extDir, relativeSrc);
+    const stats = lstatSyncSafe(fullSrc);
+    assert.ok(stats !== null, `<script> src file not found in ${fileName} (src=${JSON.stringify(src)})`);
+    assert.ok(stats.isFile(), `<script> src file invalid in ${fileName} (src=${JSON.stringify(src)})`);
+}
+
+/**
+ * @param {string} string
+ * @param {RegExp} pattern
+ * @returns {number}
+ */
+function getSubstringCount(string, pattern) {
+    let count = 0;
+    while (true) {
+        const match = pattern.exec(string);
+        if (match === null) { break; }
+        ++count;
+    }
+    return count;
+}
+
+/**
+ * @param {string[]} scriptPaths
+ * @returns {string[]}
+ */
+function getSortedScriptPaths(scriptPaths) {
+    // Sort file names without the extension
+    const extensionPattern = /\.[^.]*$/;
+    const scriptPaths2 = scriptPaths.map((value) => {
+        const match = extensionPattern.exec(value);
+        let ext = '';
+        if (match !== null) {
+            ext = match[0];
+            value = value.substring(0, value.length - ext.length);
+        }
+        return {value, ext};
+    });
+
+    const stringComparer = new Intl.Collator('en-US'); // Invariant locale
+    scriptPaths2.sort((a, b) => stringComparer.compare(a.value, b.value));
+
+    return scriptPaths2.map(({value, ext}) => `${value}${ext}`);
+}
+
+/**
+ * @param {string} fileName
+ * @param {import('jsdom').DOMWindow} window
+ * @throws {Error}
+ */
+function validateScriptOrder(fileName, window) {
+    const {document, Node: {ELEMENT_NODE, TEXT_NODE}, NodeFilter} = window;
+
+    const scriptElements = document.querySelectorAll('script');
+    if (scriptElements.length === 0) { return; }
+
+    // Assert all scripts are siblings
+    const scriptContainerElement = /** @type {Node} */ (scriptElements[0].parentNode);
+    for (const element of scriptElements) {
+        if (element.parentNode !== scriptContainerElement) {
+            assert.fail('All script nodes are not contained within the same element');
+        }
+    }
+
+    // Get script groupings and order
+    /** @type {string[][]} */
+    const scriptGroups = [];
+    const newlinePattern = /\n/g;
+    let separatingText = '';
+    const walker = document.createTreeWalker(scriptContainerElement, NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_TEXT);
+    walker.firstChild();
+    for (let node = /** @type {?Node} */ (walker.currentNode); node !== null; node = walker.nextSibling()) {
+        switch (node.nodeType) {
+            case ELEMENT_NODE:
+                if (/** @type {Element} */ (node).tagName.toLowerCase() === 'script') {
+                    /** @type {string[]} */
+                    let scriptGroup;
+                    if (scriptGroups.length === 0 || getSubstringCount(separatingText, newlinePattern) >= 2) {
+                        scriptGroup = [];
+                        scriptGroups.push(scriptGroup);
+                    } else {
+                        scriptGroup = scriptGroups[scriptGroups.length - 1];
+                    }
+                    scriptGroup.push(/** @type {HTMLScriptElement} */ (node).src);
+                    separatingText = '';
+                }
+                break;
+            case TEXT_NODE:
+                separatingText += node.nodeValue;
+                break;
+        }
+    }
+
+    // Ensure core.js is first (if it is present)
+    const ignorePattern = /^\/lib\//;
+    const index = scriptGroups.flat()
+        .filter((value) => !ignorePattern.test(value))
+        .findIndex((value) => (value === '/js/core.js'));
+    assert.ok(index <= 0, 'core.js is not the first included script');
+
+    // Check script order
+    for (let i = 0, ii = scriptGroups.length; i < ii; ++i) {
+        const scriptGroup = scriptGroups[i];
+        try {
+            assert.deepStrictEqual(scriptGroup, getSortedScriptPaths(scriptGroup));
+        } catch (e) {
+            console.error(`Script order for group ${i + 1} in file ${fileName} is not correct:`);
+            throw e;
+        }
+    }
+}
+
+/**
+ * @param {string} fileName
+ * @param {string} extDir
+ */
+function validateHtmlScripts(fileName, extDir) {
+    const fullFileName = path.join(extDir, fileName);
+    const domSource = fs.readFileSync(fullFileName, {encoding: 'utf8'});
+    const dom = new JSDOM(domSource);
+    const {window} = dom;
+    const {document} = window;
+    try {
+        for (const {src} of document.querySelectorAll('script')) {
+            validatePath(src, fullFileName, extDir);
+        }
+        for (const {href} of document.querySelectorAll('link')) {
+            validatePath(href, fullFileName, extDir);
+        }
+        validateScriptOrder(fileName, window);
+    } finally {
+        window.close();
+    }
+}
+
+
+/** */
+function main() {
+    try {
+        const extDir = path.resolve(__dirname, '..', '..', 'ext');
+        const pattern = /\.html$/;
+        const ignorePattern = /^lib[\\/]/;
+        const fileNames = getAllFiles(extDir, (f) => pattern.test(f) && !ignorePattern.test(f));
+        for (const fileName of fileNames) {
+            validateHtmlScripts(fileName, extDir);
+        }
+    } catch (e) {
+        console.error(e);
+        process.exit(-1);
+        return;
+    }
+    process.exit(0);
+}
+
+
+if (require.main === module) { main(); }