lib: add internal removeColors helper

Instead of having three times the same RegExp, just use a helper.

PR-URL: https://github.com/nodejs/node/pull/17615
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

lib/internal/url.js

@@ -6,7 +6,7 @@ const {
   isHexTable
 } = require('internal/querystring');
 
-const { getConstructorOf } = require('internal/util');
+const { getConstructorOf, removeColors } = require('internal/util');
 const errors = require('internal/errors');
 const querystring = require('querystring');
 
@@ -181,9 +181,8 @@ class URLSearchParams {
     for (var i = 0; i < list.length; i += 2)
       output.push(`${innerInspect(list[i])} => ${innerInspect(list[i + 1])}`);
 
-    var colorRe = /\u001b\[\d\d?m/g;
     var length = output.reduce(
-      (prev, cur) => prev + cur.replace(colorRe, '').length + separator.length,
+      (prev, cur) => prev + removeColors(cur).length + separator.length,
       -separator.length
     );
     if (length > ctx.breakLength) {

lib/internal/util.js

@@ -18,6 +18,12 @@ const noCrypto = !process.versions.openssl;
 
 const experimentalWarnings = new Set();
 
+const colorRegExp = /\u001b\[\d\d?m/g;
+
+function removeColors(str) {
+  return str.replace(colorRegExp, '');
+}
+
 function isError(e) {
   return objectToString(e) === '[object Error]' || e instanceof Error;
 }
@@ -362,6 +368,7 @@ module.exports = {
   objectToString,
   promisify,
   spliceOne,
+  removeColors,
 
   // Symbol used to customize promisify conversion
   customPromisifyArgs: kCustomPromisifyArgsSymbol,

lib/util.js

@@ -59,7 +59,8 @@ const {
   getIdentificationOf,
   isError,
   promisify,
-  join
+  join,
+  removeColors
 } = require('internal/util');
 
 const inspectDefaultOptions = Object.seal({
@@ -85,7 +86,6 @@ const strEscapeSequencesRegExp = /[\x00-\x1f\x27\x5c]/;
 const strEscapeSequencesReplacer = /[\x00-\x1f\x27\x5c]/g;
 /* eslint-enable */
 const keyStrRegExp = /^[a-zA-Z_][a-zA-Z_0-9]*$/;
-const colorRegExp = /\u001b\[\d\d?m/g;
 const numberRegExp = /^(0|[1-9][0-9]*)$/;
 
 const readableRegExps = {};
@@ -905,7 +905,7 @@ function reduceToSingleString(ctx, output, base, braces, addLn) {
     var length = 0;
     for (; i < output.length && length <= breakLength; i++) {
       if (ctx.colors) {
-        length += output[i].replace(colorRegExp, '').length + 1;
+        length += removeColors(output[i]).length + 1;
       } else {
         length += output[i].length + 1;
       }