Big Change Update

uBlock0.chromium/js/text-utils.js

@@ -0,0 +1,107 @@
+/*******************************************************************************
+
+    uBlock Origin - a comprehensive, efficient content blocker
+    Copyright (C) 2014-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
+*/
+
+'use strict';
+
+/******************************************************************************/
+
+// https://bugs.chromium.org/p/v8/issues/detail?id=2869
+//   orphanizeString is to work around String.slice() potentially causing
+//   the whole raw filter list to be held in memory just because we cut out
+//   the title as a substring.
+
+function orphanizeString(s) {
+    return JSON.parse(JSON.stringify(s));
+}
+
+/******************************************************************************/
+
+class LineIterator {
+    constructor(text, offset) {
+        this.text = text;
+        this.textLen = this.text.length;
+        this.offset = offset || 0;
+    }
+    next(offset) {
+        if ( offset !== undefined ) {
+            this.offset += offset;
+        }
+        let lineEnd = this.text.indexOf('\n', this.offset);
+        if ( lineEnd === -1 ) {
+            lineEnd = this.text.indexOf('\r', this.offset);
+            if ( lineEnd === -1 ) {
+                lineEnd = this.textLen;
+            }
+        }
+        const line = this.text.slice(this.offset, lineEnd);
+        this.offset = lineEnd + 1;
+        return line;
+    }
+    peek(n) {
+        const offset = this.offset;
+        return this.text.slice(offset, offset + n);
+    }
+    charCodeAt(offset) {
+        return this.text.charCodeAt(this.offset + offset);
+    }
+    eot() {
+        return this.offset >= this.textLen;
+    }
+}
+
+/******************************************************************************/
+
+// The field iterator is less CPU-intensive than when using native
+// String.split().
+
+class FieldIterator {
+    constructor(sep) {
+        this.text = '';
+        this.sep = sep;
+        this.sepLen = sep.length;
+        this.offset = 0;
+    }
+    first(text) {
+        this.text = text;
+        this.offset = 0;
+        return this.next();
+    }
+    next() {
+        let end = this.text.indexOf(this.sep, this.offset);
+        if ( end === -1 ) {
+            end = this.text.length;
+        }
+        const field = this.text.slice(this.offset, end);
+        this.offset = end + this.sepLen;
+        return field;
+    }
+    remainder() {
+        return this.text.slice(this.offset);
+    }
+}
+
+/******************************************************************************/
+
+export {
+    FieldIterator,
+    LineIterator,
+    orphanizeString,
+};