use array of strings to trim instead of regexp

Author: UziTech

src/Tokenizer.ts

@@ -84,10 +84,10 @@ export class _Tokenizer<ParserOutput = string, RendererOutput = string> {
       const text = cap[0].replace(this.rules.other.codeRemoveIndent, '');
       return {
         type: 'code',
-        raw: rtrim(cap[0], this.rules.other.reverseBlankLines),
+        raw: rtrim(cap[0], ['\n', '\t', ' ']),
         codeBlockStyle: 'indented',
         text: !this.options.pedantic
-          ? rtrim(text, this.rules.other.reverseBlankLines)
+          ? rtrim(text, ['\n', '\t', ' '])
           : text,
       };
     }

src/helpers.ts

@@ -85,25 +85,20 @@ export function splitCells(tableRow: string, count?: number) {
  * @param str
  * @param c
  */
-export function rtrim(str: string, c: string | RegExp) {
+export function rtrim(str: string, c: string | string[]) {
   const l = str.length;
   if (l === 0) {
     return '';
   }
 
-  if (c instanceof RegExp) {
-    const reversedStr = [...str].reverse().join('');
-    const match = c.exec(reversedStr);
-    if (match) {
-      return str.slice(0, l - match[0].length);
-    }
-    return str;
+  if (typeof c === 'string') {
+    c = [c];
   }
 
   let suffLen = 0;
   while (suffLen < l) {
     const currChar = str.charAt(l - suffLen - 1);
-    if (currChar === c) {
+    if (c.includes(currChar)) {
       suffLen++;
     } else {
       break;

src/rules.ts

@@ -29,7 +29,6 @@ try {
 
 export const other = {
   codeRemoveIndent: /^(?: {1,4}| {0,3}\t)/gm,
-  reverseBlankLines: /^(?:[^\S\n]*\n)*/,
   outputLinkReplace: /\\([\[\]])/g,
   indentCodeCompensation: /^(\s+)(?:```)/,
   beginningSpace: /^\s+/,