add escapes to formatters

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@squeebot/core",
-  "version": "3.6.0-1",
+  "version": "3.6.1",
   "description": "Squeebot v3 core for the execution environment",
   "main": "lib/index.js",
   "types": "lib/index.d.ts",

src/types/message-format.ts

@@ -123,6 +123,9 @@ export class Formatter {
    */
   public colorEscape = '';
 
+  /** Replacements for string escape function */
+  public escapeReplacements: [RegExp, string, string][] = [];
+
   constructor(
     /**
      * @deprecated Use feature flags
@@ -167,10 +170,27 @@ export class Formatter {
     }
   }
 
+  /**
+   * Strip any extraneous tags/info.
+   * @param msg Message
+   * @returns Stripped message
+   */
   public strip(msg: string): string {
     return msg;
   }
 
+  /**
+   * Escape any extraneous tags/info.
+   * @param msg Message
+   * @returns Escaped message
+   */
+  public escape(msg: string): string {
+    return this.escapeReplacements.reduce(
+      (str, replacement) => str.replace(replacement[0], replacement[1]),
+      msg
+    );
+  }
+
   /**
    * Object compositor.
    * 
@@ -284,6 +304,14 @@ export class HTMLFormatter extends Formatter {
     multicode: {start: '<pre><code>', end: '</code></pre>'},
   };
 
+  public escapeReplacements: [RegExp, string, string][] = [
+    [/&/g, '&amp;', 'ampersand'],
+    [/</g, '&lt;', 'angle brackets'],
+    [/>/g, '&gt;', 'angle brackets'],
+    [/"/g, '&quot;', 'quotes'],
+    [/'/g, '&#039;', 'single quates'],
+  ];
+
   constructor(flags?: ProtocolFeatureFlag[]) {
     super(true, true, flags);
   }
@@ -323,6 +351,20 @@ export class MarkdownFormatter extends Formatter {
     multicode: {start: '```', end: '```'},
   };
 
+  public escapeReplacements: [RegExp, string, string][] = [
+    [/\*/g, '\\*', 'asterisks'],
+    [/#/g, '\\#', 'number signs'],
+    [/\//g, '\\/', 'slashes'],
+    [/\(/g, '\\(', 'parentheses'],
+    [/\)/g, '\\)', 'parentheses'],
+    [/\[/g, '\\[', 'square brackets'],
+    [/\]/g, '\\]', 'square brackets'],
+    [/</g, '&lt;', 'angle brackets'],
+    [/>/g, '&gt;', 'angle brackets'],
+    [/_/g, '\\_', 'underscores'],
+    [/`/g, '\\`', 'codeblocks']
+  ];
+
   constructor(flags?: ProtocolFeatureFlag[]) {
     super(true, false, flags);
   }