Initial commit

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true

.eslintrc.cjs

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+module.exports = {
+  root: true,
+  plugins: ['jest'],
+  extends: ['standard'],
+  rules: {
+    'comma-dangle': ['error', 'always-multiline'],
+    'arrow-parens': 0,
+    'no-tabs': 0,
+  },
+  env: {
+    'jest/globals': true,
+  },
+}

.gitignore

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+node_modules/

LICENSE

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+# Blue Oak Model License
+
+Version 1.0.0
+
+## Purpose
+
+This license gives everyone as much permission to work with
+this software as possible, while protecting contributors
+from liability.
+
+## Acceptance
+
+In order to receive this license, you must agree to its
+rules.  The rules of this license are both obligations
+under that agreement and conditions to your license.
+You must not do anything with this software that triggers
+a rule that you cannot or will not follow.
+
+## Copyright
+
+Each contributor licenses you to do everything with this
+software that would otherwise infringe that contributor's
+copyright in it.
+
+## Notices
+
+You must ensure that everyone who gets a copy of
+any part of this software from you, with or without
+changes, also gets the text of this license or a link to
+<https://blueoakcouncil.org/license/1.0.0>.
+
+## Excuse
+
+If anyone notifies you in writing that you have not
+complied with [Notices](#notices), you can keep your
+license by taking all practical steps to comply within 30
+days after the notice.  If you do not do so, your license
+ends immediately.
+
+## Patent
+
+Each contributor licenses you to do everything with this
+software that would otherwise infringe any patent claims
+they can license or become able to license.
+
+## Reliability
+
+No contributor can revoke this license.
+
+## No Liability
+
+***As far as the law allows, this software comes as is,
+without any warranty or condition, and no contributor
+will be liable to anyone for any damages related to this
+software or this license, under any kind of legal claim.***

babel.config.json

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+{
+  "presets": ["@babel/preset-env"]
+}

jest.config.js

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+export default {
+  restoreMocks: true,
+  clearMocks: true,
+  collectCoverageFrom: [
+    'src/index.js',
+  ],
+  coverageDirectory: 'coverage',
+  coverageThreshold: {
+    global: {
+      branches: 100,
+      functions: 100,
+      lines: 100,
+      statements: 100,
+    },
+  },
+  testRegex: /\.test\.js$/.source,
+  transform: {
+    '\\.[jt]sx?$': 'babel-jest',
+  },
+}

package.json

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+{
+  "name": "marked-mfm",
+  "version": "0.1.0",
+  "description": "Marked.js extension for Misskey-flavored Markdown",
+  "main": "./src/index.js",
+  "type": "module",
+  "scripts": {
+    "lint": "eslint .",
+    "lint-fix": "eslint --fix .",
+    "test": "jest --verbose"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://akkoma.dev/sfr/marked-mfm"
+  },
+  "bugs": {
+    "url": "https://akkoma.dev/sfr/marked-mfm/issues"
+  },
+  "author": "Sol Fisher Romanoff <sol@solfisher.com>",
+  "license": "BlueOak-1.0.0",
+  "peerDependencies": {
+    "marked": "^4.0.17"
+  },
+  "dependencies": {
+    "@babel/core": "^7.18.6",
+    "@babel/preset-env": "^7.18.6",
+    "babel-jest": "^28.1.2",
+    "eslint": "^8.19.0",
+    "eslint-config-standard": "^17.0.0",
+    "eslint-plugin-jest": "^26.5.3",
+    "jest-cli": "^28.1.2"
+  }
+}

src/index.js

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+export default (options = {}) => ({
+  extensions: [
+    {
+      name: 'mfm',
+      level: 'inline',
+      start(src) { return src.match(/\$\[/)?.index },
+      tokenizer (src, tokens) {
+        const rule = /^\$\[([\w\d]+) (.+)\]$/
+        const match = rule.exec(src)
+        if (match) {
+          const token = {
+            type: 'mfm',
+            raw: match[0],
+            markup: match[1],
+            text: match[2],
+            tokens: []
+          }
+          this.lexer.inline(token.text, token.tokens)
+          return token
+        }
+      },
+      renderer (token) {
+        const el = tokenClass => `<span style="display: inline-block" class="${tokenClass}">${this.parser.parseInline(token.tokens)}</span>`
+        switch (token.markup) {
+        case 'x2':
+          return el('x2')
+          break
+        case 'twitch':
+          return el('twitch')
+          break
+        case 'sparkle':
+          return el('sparkle')
+          break
+        default:
+          return token.raw
+        }
+      },
+    },
+  ]
+})

test/index.test.js

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+import { marked } from 'marked'
+import markedMfm from '../src/index.js'
+
+describe('marked-mfm', () => {
+  beforeEach(() => {
+    marked.setOptions(marked.getDefaults())
+  })
+
+  test('inline', () => {
+    marked.use(markedMfm())
+    expect(marked('$[x2 this text is bigger]')).toBe('<p><span style="display: inline-block" class="x2">this text is bigger</span></p>\n')
+  })
+
+  test('nested', () => {
+    marked.use(markedMfm())
+    expect(marked('$[twitch twitch $[sparkle sparkle]]')).toBe('<p><span style="display: inline-block" class="twitch">twitch <span style="display: inline-block" class="sparkle">sparkle</span></span></p>\n')
+  })
+})