Add backslash escaping

lib/index.umd.js

@@ -147,6 +147,23 @@
 
         return "$[" + token.tag + " " + this.parser.parseInline(token.tokens) + "]";
       }
+    }, {
+      name: 'escapedMfm',
+      level: 'inline',
+      start: function start(src) {
+        return src.match(/\\\$\[/);
+      },
+      tokenizer: function tokenizer(src, tokens) {
+        if (/^\\\$\[/.exec(src)) {
+          return {
+            type: 'escapedMfm',
+            raw: '\\$['
+          };
+        }
+      },
+      renderer: function renderer(token) {
+        return '$[';
+      }
     }, {
       name: 'center',
       level: 'block',

package.json

@@ -1,6 +1,6 @@
 {
   "name": "marked-mfm",
-  "version": "0.4.0",
+  "version": "0.5.0",
   "description": "Marked.js extension for Misskey-flavored Markdown",
   "main": "./src/index.js",
   "browser": "./lib/index.umd.js",

src/index.js

@@ -50,6 +50,19 @@ export default {
         return `$[${token.tag} ${this.parser.parseInline(token.tokens)}]`
       },
     },
+    {
+      name: 'escapedMfm',
+      level: 'inline',
+      start (src) { return src.match(/\\\$\[/) },
+      tokenizer (src, tokens) {
+        if (/^\\\$\[/.exec(src)) {
+          return { type: 'escapedMfm', raw: '\\$[' }
+        }
+      },
+      renderer (token) {
+        return '$['
+      },
+    },
     {
       name: 'center',
       level: 'block',

test/index.test.js

@@ -42,6 +42,11 @@ describe('marked-mfm', () => {
     expect(marked('$[spin.alternate,speed=0.5s test]')).toBe('<p><span class="mfm _mfm_spin_" data-alternate data-speed="0.5s">test</span></p>\n')
   })
 
+  test('escaped', () => {
+    marked.use(markedMfm)
+    expect(marked('\\$[spin test]')).toBe('<p>$[spin test]</p>\n')
+  })
+
   test('center', () => {
     marked.use(markedMfm)
     expect(marked('<center>test *italic*</center>')).toBe('<center>test <em>italic</em></center>\n')