readline: refactor to avoid unsafe regex primordials

aduh95 · richardlau · commit db31de634ea9 · 2022-11-23T12:06:48.000-05:00
Refs: #43475 Backport-PR-URL: #44926 PR-URL: #43475
diff --git a/lib/readline.js b/lib/readline.js
@@ -48,12 +48,12 @@ const {
   NumberIsNaN,
   ObjectDefineProperty,
   ObjectSetPrototypeOf,
-  RegExpPrototypeTest,
+  RegExpPrototypeExec,
+  RegExpPrototypeSymbolReplace,
+  RegExpPrototypeSymbolSplit,
   StringPrototypeCodePointAt,
   StringPrototypeEndsWith,
-  StringPrototypeMatch,
   StringPrototypeRepeat,
-  StringPrototypeReplace,
   StringPrototypeSlice,
   StringPrototypeSplit,
   StringPrototypeStartsWith,
@@ -642,12 +642,12 @@ Interface.prototype._normalWrite = function(b) {
   let string = this._decoder.write(b);
   if (this._sawReturnAt &&
       DateNow() - this._sawReturnAt <= this.crlfDelay) {
-    string = StringPrototypeReplace(string, /^\n/, '');
+    string = RegExpPrototypeSymbolReplace(/^\n/, string, '');
     this._sawReturnAt = 0;
   }
 
   // Run test() on the new string chunk, not on the entire line buffer.
-  const newPartContainsEnding = RegExpPrototypeTest(lineEnding, string);
+  const newPartContainsEnding = RegExpPrototypeExec(lineEnding, string) !== null;
 
   if (this._line_buffer) {
     string = this._line_buffer + string;
@@ -773,7 +773,7 @@ Interface.prototype._wordLeft = function() {
     const leading = StringPrototypeSlice(this.line, 0, this.cursor);
     const reversed = ArrayPrototypeJoin(
       ArrayPrototypeReverse(ArrayFrom(leading)), '');
-    const match = StringPrototypeMatch(reversed, /^\s*(?:[^\w\s]+|\w+)?/);
+    const match = RegExpPrototypeExec(/^\s*(?:[^\w\s]+|\w+)?/, reversed);
     this._moveCursor(-match[0].length);
   }
 };
@@ -782,7 +782,7 @@ Interface.prototype._wordLeft = function() {
 Interface.prototype._wordRight = function() {
   if (this.cursor < this.line.length) {
     const trailing = StringPrototypeSlice(this.line, this.cursor);
-    const match = StringPrototypeMatch(trailing, /^(?:\s+|[^\w\s]+|\w+)\s*/);
+    const match = RegExpPrototypeExec(/^(?:\s+|[^\w\s]+|\w+)\s*/, trailing);
     this._moveCursor(match[0].length);
   }
 };
@@ -818,7 +818,7 @@ Interface.prototype._deleteWordLeft = function() {
     let leading = StringPrototypeSlice(this.line, 0, this.cursor);
     const reversed = ArrayPrototypeJoin(
       ArrayPrototypeReverse(ArrayFrom(leading)), '');
-    const match = StringPrototypeMatch(reversed, /^\s*(?:[^\w\s]+|\w+)?/);
+    const match = RegExpPrototypeExec(/^\s*(?:[^\w\s]+|\w+)?/, reversed);
     leading = StringPrototypeSlice(leading, 0,
                                    leading.length - match[0].length);
     this.line = leading + StringPrototypeSlice(this.line, this.cursor,
@@ -832,7 +832,7 @@ Interface.prototype._deleteWordLeft = function() {
 Interface.prototype._deleteWordRight = function() {
   if (this.cursor < this.line.length) {
     const trailing = StringPrototypeSlice(this.line, this.cursor);
-    const match = StringPrototypeMatch(trailing, /^(?:\s+|\W+|\w+)\s*/);
+    const match = RegExpPrototypeExec(/^(?:\s+|\W+|\w+)\s*/, trailing);
     this.line = StringPrototypeSlice(this.line, 0, this.cursor) +
                 StringPrototypeSlice(trailing, match[0].length);
     this._refreshLine();
@@ -1272,7 +1272,7 @@ Interface.prototype._ttyWrite = function(s, key) {
       // falls through
       default:
         if (typeof s === 'string' && s) {
-          const lines = StringPrototypeSplit(s, /\r\n|\n|\r/);
+          const lines = RegExpPrototypeSymbolSplit(/\r\n|\n|\r/, s);
           for (let i = 0, len = lines.length; i < len; i++) {
             if (i > 0) {
               this._line();
