1 files changed, 151 insertions, 0 deletions
diff --git a/platform/mv3/extension/js/utils.js b/platform/mv3/extension/js/utils.js
new file mode 100644
index 0000000..b1a463a
--- /dev/null
+++ b/platform/mv3/extension/js/utils.js
@@ -0,0 +1,151 @@
+/*******************************************************************************
+
+    uBlock Origin Lite - a comprehensive, MV3-compliant content blocker
+    Copyright (C) 2022-present Raymond Hill
+
+    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 {http://www.gnu.org/licenses/}.
+
+    Home: https://github.com/gorhill/uBlock
+*/
+
+/* jshint esversion:11 */
+
+'use strict';
+
+/******************************************************************************/
+
+import { browser } from './ext.js';
+
+/******************************************************************************/
+
+function parsedURLromOrigin(origin) {
+    try {
+        return new URL(origin);
+    } catch(ex) {
+    }
+}
+
+/******************************************************************************/
+
+const toBroaderHostname = hn => {
+    if ( hn === '*' ) { return ''; }
+    const pos = hn.indexOf('.');
+    return pos !== -1 ? hn.slice(pos+1) : '*';
+};
+
+/******************************************************************************/
+
+// Is hna descendant hostname of hnb?
+
+const isDescendantHostname = (hna, hnb) => {
+    if ( hnb === 'all-urls' ) { return true; }
+    if ( hna.endsWith(hnb) === false ) { return false; }
+    if ( hna === hnb ) { return false; }
+    return hna.charCodeAt(hna.length - hnb.length - 1) === 0x2E /* '.' */;
+};
+
+const isDescendantHostnameOfIter = (hna, iterb) => {
+    const setb = iterb instanceof Set ? iterb : new Set(iterb);
+    if ( setb.has('all-urls') || setb.has('*') ) { return true; }
+    let hn = hna;
+    while ( hn ) {
+        const pos = hn.indexOf('.');
+        if ( pos === -1 ) { break; }
+        hn = hn.slice(pos + 1);
+        if ( setb.has(hn) ) { return true; }
+    }
+    return false;
+};
+
+const intersectHostnameIters = (itera, iterb) => {
+    const setb = iterb instanceof Set ? iterb : new Set(iterb);
+    if ( setb.has('all-urls') || setb.has('*') ) { return Array.from(itera); }
+    const out = [];
+    for ( const hna of itera ) {
+        if ( setb.has(hna) || isDescendantHostnameOfIter(hna, setb) ) {
+            out.push(hna);
+        }
+    }
+    return out;
+};
+
+const subtractHostnameIters = (itera, iterb) => {
+    const setb = iterb instanceof Set ? iterb : new Set(iterb);
+    if ( setb.has('all-urls') || setb.has('*') ) { return []; }
+    const out = [];
+    for ( const hna of itera ) {
+        if ( setb.has(hna) ) { continue; }
+        if ( isDescendantHostnameOfIter(hna, setb) ) { continue; }
+        out.push(hna);
+    }
+    return out;
+};
+
+/******************************************************************************/
+
+const matchesFromHostnames = hostnames => {
+    const out = [];
+    for ( const hn of hostnames ) {
+        if ( hn === '*' || hn === 'all-urls' ) {
+            out.length = 0;
+            out.push('<all_urls>');
+            break;
+        }
+        out.push(`*://*.${hn}/*`);
+    }
+    return out;
+};
+
+const hostnamesFromMatches = origins => {
+    const out = [];
+    for ( const origin of origins ) {
+        if ( origin === '<all_urls>' ) {
+            out.push('all-urls');
+            continue;
+        }
+        const match = /^\*:\/\/(?:\*\.)?([^\/]+)\/\*/.exec(origin);
+        if ( match === null ) { continue; }
+        out.push(match[1]);
+    }
+    return out;
+};
+
+/******************************************************************************/
+
+export const broadcastMessage = message => {
+    const bc = new self.BroadcastChannel('uBOL');
+    bc.postMessage(message);
+};
+
+/******************************************************************************/
+
+const ubolLog = (...args) => {
+    // Do not pollute dev console in stable release.
+    if ( browser.runtime.id === 'ddkjiahejlhfcafbddmgiahcphecmpfh' ) { return; }
+    console.info('[uBOL]', ...args);
+};
+
+/******************************************************************************/
+
+export {
+    parsedURLromOrigin,
+    toBroaderHostname,
+    isDescendantHostname,
+    isDescendantHostnameOfIter,
+    intersectHostnameIters,
+    subtractHostnameIters,
+    matchesFromHostnames,
+    hostnamesFromMatches,
+    ubolLog,
+};