Rewrite

.gitignore

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+
+# Created by https://www.gitignore.io/api/node
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+
+# End of https://www.gitignore.io/api/node
+lib

LICENSE

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+The MIT License (MIT)
+Copyright © 2017 3846masa
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the “Software”), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+# @paperist/remark-math
+
+[![LICENSE][license-badge]][license]
+[![NPM][npm-badge]][npm]
+[![standard-readme compliant][standard-readme-badge]][standard-readme]
+
+[npm]: https://www.npmjs.com/package/@paperist/remark-crossref
+[license]: https://3846masa.mit-license.org
+[standard-readme]: https://github.com/RichardLitt/standard-readme
+
+[npm-badge]: https://img.shields.io/npm/v/@paperist/remark-crossref.svg?style=flat-square&logo=data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgBAMAAACBVGfHAAAABGdBTUEAALGPC/xhBQAAAAFzUkdCAK7OHOkAAAAbUExURcwAAOeIiP////G7u/ri4tIZGdpFReJsbPC3t075sZwAAAAvSURBVCjPY2CgDWAThIMEsACjEhwIUCZg0dGCIqASwMAxMgXAgSzOwMAOC2TqAwBvzR4JxLaP0gAAAABJRU5ErkJggg==
+[license-badge]: https://img.shields.io/badge/license-MIT-blue.svg?style=flat-square&logo=data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQBAMAAADt3eJSAAAAIGNIUk0AAHomAACAhAAA%2BgAAAIDoAAB1MAAA6mAAADqYAAAXcJy6UTwAAAAVUExURSBTICJcIiNgIiZoJTuhNyt3Kf///%2BCqxSgAAAAGdFJOUwpclbn%2B4Fj6/H8AAAABYktHRAZhZrh9AAAACXBIWXMAAA3XAAAN1wFCKJt4AAAAB3RJTUUH4AkEEjEV7MDQQwAAAGBJREFUCNc1TUEKgDAMi07vE/Q%2BRD8g%2B4BbvAvi/79iMjDQJm1CC6BbDzRsZI3incIpYeYFhCaYnLiyPYnYkwWZFWoFHrSuttCmmbwXh0eJQYVON4JthZTxCzzAmyb8%2BAAKXBRyN6RyZQAAAABJRU5ErkJggg==
+[standard-readme-badge]: https://img.shields.io/badge/standard--readme-OK-green.svg?style=flat-square
+
+> [wooorm/remark] plugin for math likes [KaTeX] / [MathJax]
+
+[wooorm/remark]: https://github.com/wooorm/remark
+[KaTeX]: https://khan.github.io/KaTeX/
+[MathJax]: https://www.mathjax.org/
+
+## Table of Contents
+
+- [Install](#install)
+- [Usage](#usage)
+- [AST](#ast)
+- [Contribute](#contribute)
+- [License](#license)
+
+## Install
+
+```
+npm i remark @paperist/remark-math
+```
+
+## Usage
+
+```js
+const unified = require('unified');
+const parser = require('remark-parse');
+const math = require('@paperist/remark-math');
+
+const markdown = `
+In an x-y Cartesian coordinate system,
+the circle with centre coordinates \\((a, b)\\) and
+radius \\(r\\) is the set of all points \\((x, y)\\) such that
+
+\\[
+(x - a)^2 + (y - b)^2 = r^2
+\\]
+
+> https://en.wikipedia.org/wiki/Circle
+`;
+
+const processor = unified().use(parser).use(math);
+const ast = processor.parse(markdown);
+
+processor.run(ast).then(ast => {
+  console.dir(ast, { depth: null });
+});
+```
+
+## AST
+
+See also [mdast], [unist].
+
+[mdast]: https://github.com/syntax-tree/mdast
+[unist]: https://github.com/syntax-tree/unist
+
+### `Math`
+
+`Math` extends [`Text`][unist-text].
+
+```typescript
+interface Math extends Text {
+  type: 'math';
+  math: string;
+}
+```
+
+For example, the following markdown:
+
+```md
+\[
+x^2 + y^2 = r^2
+\]
+```
+
+Yields:
+
+```json
+{
+  "type": "math",
+  "value": "\\[\nx^2 + y^2 = r^2\n\\]",
+  "math": "\nx^2 + y^2 = r^2\n"
+}
+```
+
+### `InlineMath`
+
+`InlineMath` extends [`Text`][unist-text].
+
+```typescript
+interface InlineMath extends Text {
+  type: 'inlineMath';
+  math: string;
+}
+```
+
+For example, the following markdown:
+
+```md
+\(E = mc^2\)
+```
+
+Yields:
+
+```json
+{
+  "type": "inlineMath",
+  "value": "\\(E = mc^2\\)",
+  "math": "E = mc^2"
+}
+```
+
+[unist-text]: https://github.com/syntax-tree/unist#text
+
+## Contribute
+
+PRs accepted.
+
+## License
+
+![3846masa] MIT (c) 3846masa
+
+[3846masa]: https://www.gravatar.com/avatar/cfeae69aae4f4fc102960f01d35d2d86?s=50

circle.yml

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+machine:
+  node:
+    version: 6
+  post:
+    - npm install -g npm
+  timezone: Asia/Tokyo
+dependencies:
+  pre:
+    - npm config set progress false
+    - npm config set spin false
+    - npm install -d
+  override:
+    - npm run build
+test:
+  override:
+    - npm test
+deployment:
+  production:
+    tag: /v\d+(\.\d+)*/
+    commands:
+      - echo -e "$NPM_USER\n$NPM_PASS\n$NPM_EMAIL" | npm login
+      - npm publish --access=public

package.json

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+{
+  "name": "@paperist/remark-math",
+  "description": "wooorm/remark plugin for math likes LaTeX / MathJax",
+  "author": "3846masa <[email protected]>",
+  "license": "MIT",
+  "homepage": "https://github.com/Paperist/remark-math#readme",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/Paperist/remark-math.git"
+  },
+  "bugs": {
+    "url": "https://github.com/Paperist/remark-math/issues"
+  },
+  "version": "0.0.0",
+  "main": "lib/index.js",
+  "files": [
+    "lib"
+  ],
+  "directories": {
+    "lib": "lib"
+  },
+  "scripts": {
+    "prebuild": "npm-run-all prebuild:clean prebuild:mkdir",
+    "build": "npm-run-all -p build:*",
+    "postbuild": "npm-run-all -p postbuild:*",
+    "prebuild:clean": "npm run clean",
+    "postbuild:copy-d.ts": "cpx \"src/**/*.d.ts\" lib",
+    "prebuild:mkdir": "mkdirp lib/peg",
+    "build:peg": "npm-run-all -p build:peg:*",
+    "build:peg:inlineMath": "pegjs -o ./lib/peg/inlineMath.js ./src/peg/inlineMath.pegjs",
+    "build:peg:math": "pegjs -o ./lib/peg/math.js ./src/peg/math.pegjs",
+    "build:tsc": "tsc",
+    "clean": "rimraf lib",
+    "precommit": "lint-staged"
+  },
+  "dependencies": {},
+  "peerDependencies": {
+    "remark-parse": "^4.0.0"
+  },
+  "devDependencies": {
+    "@paperist/types-remark": "^0.1.1",
+    "@types/node": "^8.0.19",
+    "@types/pegjs": "^0.10.0",
+    "cpx": "^1.5.0",
+    "husky": "^0.14.3",
+    "lint-staged": "^4.0.2",
+    "mkdirp": "^0.5.1",
+    "npm-run-all": "^4.0.2",
+    "pegjs": "^0.10.0",
+    "prettier-package-json": "^1.4.0",
+    "remark-parse": "^4.0.0",
+    "rimraf": "^2.6.1",
+    "typescript": "^2.4.2",
+    "unified": "^6.1.5"
+  },
+  "keywords": [
+    "katex",
+    "markdown",
+    "mathjax",
+    "remark"
+  ],
+  "lint-staged": {
+    "package.json": [
+      "prettier-package-json --write",
+      "git add"
+    ]
+  },
+  "types": "lib/index.d.ts"
+}

src/InlineMathTokenizer.ts

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+import { UNIST } from 'unist';
+import { MDAST } from 'mdast';
+import * as RemarkParse from 'remark-parse';
+
+import { parse, ParseResult } from './peg/inlineMath';
+
+declare module 'mdast' {
+  export namespace MDAST {
+    interface InlineMath extends UNIST.Text {
+      type: 'inlineMath';
+      math: string;
+    }
+  }
+}
+
+const InlineMathLocator: RemarkParse.Locator = (value, fromIndex) => {
+  let location = value.indexOf('$', fromIndex);
+  if (location === -1) {
+    location = value.indexOf('\\(', fromIndex);
+  }
+  return location;
+};
+
+const InlineMathTokenizerFunction: RemarkParse.TokenizerFunction = (
+  eat,
+  value,
+  silent
+) => {
+  let result: ParseResult;
+  try {
+    result = parse(value);
+  } catch (err) {
+    return silent ? false : undefined;
+  }
+
+  if (silent) {
+    return true;
+  }
+
+  const matchStr = value.substring(
+    result.location.start.offset,
+    result.location.end.offset
+  );
+
+  const node: MDAST.InlineMath = {
+    type: 'inlineMath',
+    value: matchStr,
+    math: result.math,
+  };
+
+  return eat(matchStr)(node);
+};
+
+const InlineMathTokenizer: RemarkParse.Tokenizer = Object.assign(
+  InlineMathTokenizerFunction,
+  {
+    locator: InlineMathLocator,
+    notInBlock: true,
+    notInList: true,
+    notInLink: true,
+  }
+);
+
+export default InlineMathTokenizer;