util: support array of formats in util.styleText

PR-URL: nodejs#52040
Fixes: nodejs#52035
Reviewed-By: Chemi Atlow <[email protected]>
Reviewed-By: Paolo Insogna <[email protected]>

Author: marco-ippolito

doc/api/util.md

@@ -1806,7 +1806,8 @@ console.log(util.stripVTControlCharacters('\u001B[4mvalue\u001B[0m'));
 added: v21.7.0
 -->
 
-* `format` {string} A text format defined in `util.inspect.colors`.
+* `format` {string | Array} A text format or an Array
+  of text formats defined in `util.inspect.colors`.
 * `text` {string} The text to to be formatted.
 
 This function returns a formatted text considering the `format` passed.
@@ -1828,7 +1829,16 @@ console.log(errorMessage);
 
 ```cjs
 console.log(
-  util.styleText('underline', util.styleText('italic', 'My italic underlined message')),
+  util.styleText(['underline', 'italic'], 'My italic underlined message'),
+);
+```
+
+When passing an array of formats, the order of the format applied
+is left to right so the following style might overwrite the previous one.
+
+```cjs
+console.log(
+  util.styleText(['red', 'green'], 'text'), // green
 );
 ```
 

lib/util.js

@@ -199,17 +199,40 @@ function pad(n) {
 }
 
 /**
- * @param {string} format
+ * @param {string} code
+ * @returns {string}
+ */
+function escapeStyleCode(code) {
+  return `\u001b[${code}m`;
+}
+
+/**
+ * @param {string | string[]} format
  * @param {string} text
  * @returns {string}
  */
 function styleText(format, text) {
   validateString(text, 'text');
+  if (ArrayIsArray(format)) {
+    let left = '';
+    let right = '';
+    for (const key of format) {
+      const formatCodes = inspect.colors[key];
+      if (formatCodes == null) {
+        validateOneOf(key, 'format', ObjectKeys(inspect.colors));
+      }
+      left += escapeStyleCode(formatCodes[0]);
+      right = `${escapeStyleCode(formatCodes[1])}${right}`;
+    }
+
+    return `${left}${text}${right}`;
+  }
+
   const formatCodes = inspect.colors[format];
   if (formatCodes == null) {
     validateOneOf(format, 'format', ObjectKeys(inspect.colors));
   }
-  return `\u001b[${formatCodes[0]}m${text}\u001b[${formatCodes[1]}m`;
+  return `${escapeStyleCode(formatCodes[0])}${text}${escapeStyleCode(formatCodes[1])}`;
 }
 
 const months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',

test/parallel/test-util-styletext.js

@@ -12,7 +12,6 @@ const util = require('util');
   Symbol(),
   () => {},
   {},
-  [],
 ].forEach((invalidOption) => {
   assert.throws(() => {
     util.styleText(invalidOption, 'test');
@@ -33,3 +32,12 @@ assert.throws(() => {
 });
 
 assert.strictEqual(util.styleText('red', 'test'), '\u001b[31mtest\u001b[39m');
+
+assert.strictEqual(util.styleText(['bold', 'red'], 'test'), '\u001b[1m\u001b[31mtest\u001b[39m\u001b[22m');
+assert.strictEqual(util.styleText(['bold', 'red'], 'test'), util.styleText('bold', util.styleText('red', 'test')));
+
+assert.throws(() => {
+  util.styleText(['invalid'], 'text');
+}, {
+  code: 'ERR_INVALID_ARG_VALUE',
+});