readline: small refactoring

This just removes some redundant work and some other small things.
PR-URL: #31006
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

Author: BridgeAR

lib/readline.js

@@ -720,16 +720,16 @@ Interface.prototype._historyPrev = function() {
 Interface.prototype._getDisplayPos=function(str){
 letoffset=0;
 constcol=this.columns;
-letrow=0;
+letrows=0;
 str=stripVTControlCharacters(str);
 for(leti=0,len=str.length;i<len;i++){
 constcode=str.codePointAt(i);
 if(code>=kUTF16SurrogateThreshold){// Surrogates.
 i++;
 }
 if(code===0x0a){// new line \n
-// row must be incremented by 1 even if offset = 0 or col = +Infinity
-row+=MathCeil(offset/col)||1;
+// rows must be incremented by 1 even if offset = 0 or col = +Infinity
+rows+=MathCeil(offset/col)||1;
 offset=0;
 continue;
 }
@@ -744,17 +744,16 @@ Interface.prototype._getDisplayPos = function(str) {
 }
 }
 constcols=offset%col;
-constrows=row+(offset-cols)/col;
-return{cols: cols,rows:rows};
+rows+=(offset-cols)/col;
+return{ cols, rows };
 };
 
 
 // Returns current cursor's position and line
 Interface.prototype.getCursorPos=function(){
 constcolumns=this.columns;
 conststrBeforeCursor=this._prompt+this.line.substring(0,this.cursor);
-constdispPos=this._getDisplayPos(
-stripVTControlCharacters(strBeforeCursor));
+constdispPos=this._getDisplayPos(strBeforeCursor);
 letcols=dispPos.cols;
 letrows=dispPos.rows;
 // If the cursor is on a full-width character which steps over the line,
@@ -765,7 +764,7 @@ Interface.prototype.getCursorPos = function() {
 rows++;
 cols=0;
 }
-return{cols: cols,rows:rows};
+return{ cols, rows };
 };
 Interface.prototype._getCursorPos=Interface.prototype.getCursorPos;