Add JSON filter

src/filters/out.ts

@@ -1,4 +1,5 @@
 import * as SpigConfig from '../spig-config';
+import { escape } from './json';
 
 /**
  * Returns the JSON representation of an object.
@@ -23,21 +24,6 @@ function toJSON(object: object, objectMaxDepth: number, arrayMaxLength: number,
   const paths: string[] = [];
   // A list of all the objects that were seen (used to avoid recursion)
   const values: object[] = [];
-  // The replacement characters
-  const replacements: { [key: string]: string } = {
-    '\b': '\\b',
-    '\t': '\\t',
-    '\n': '\\n',
-    '\f': '\\f',
-    '\r': '\\r',
-    '"': '\\"',
-    '\\': '\\\\',
-  };
-
-  // Matches characters that must be escaped
-  // eslint-disable-next-line no-misleading-character-class,no-control-regex
-  const escapable =
-    /[\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
 
   /**
    * Escapes control characters, quote characters, backslash characters and quotes the string.
@@ -46,17 +32,7 @@ function toJSON(object: object, objectMaxDepth: number, arrayMaxLength: number,
    * @returns {String} the quoted string
    */
   function quote(string: string): string {
-    escapable.lastIndex = 0;
-    let escaped;
-    if (escapable.test(string)) {
-      escaped = string.replace(escapable, (a) => {
-        const replacement = replacements[a];
-        if (replacement) return replacement;
-        // Pad the unicode representation with leading zeros, up to 4 characters.
-        return '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
-      });
-    } else escaped = string;
-    return '"' + escaped + '"';
+    return '"' + escape(string) + '"';
   }
 
   /**