babel · bvaughn · Aug 15, 2017 · Aug 7, 2017 · Aug 7, 2017 · Aug 7, 2017
diff --git a/.gitignore b/.gitignore
@@ -5,3 +5,20 @@ node_modules
 .DS_Store
 npm-debug.log
 _includes/readmes/*.md
+
+# testing
+coverage
+
+# production
+build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
diff --git a/js/repl/.flowconfig b/js/repl/.flowconfig
@@ -0,0 +1,9 @@
+[ignore]
+
+[include]
+
+[libs]
+
+[lints]
+
+[options]
diff --git a/js/repl/README.md b/js/repl/README.md
@@ -0,0 +1,15 @@
+# Babel REPL
+
+## Development
+
+```sh
+yarn install
+yarn start
+```
+
+Dev site is accessible at [localhost:3000](http://localhost:3000/).
+
+## Production build
+```sh
+yarn build
+```
diff --git a/js/repl/package.json b/js/repl/package.json
@@ -0,0 +1,25 @@
+{
+  "name": "babel-repl",
+  "version": "0.0.1",
+  "private": true,
+  "dependencies": {
+    "flow-bin": "^0.52.0",
+    "glamor": "^2.20.39",
+    "lodash.camelcase": "^4.3.0",
+    "lz-string": "^1.4.4",
+    "prettier": "^1.5.3",
+    "react": "^16.0.0-beta.3",
+    "react-dom": "^16.0.0-beta.3",
+    "react-scripts": "1.0.10"
+  },
+  "scripts": {
+    "build": "react-scripts build",
+    "eject": "react-scripts eject",
+    "flow": "flow",
+    "postbuild": "cp -r ./build ../../_site/repl2",
+    "prettier": "prettier --single-quote --write 'src/**/*.{js,jsx}'",
+    "start": "react-scripts start",
+    "test": "react-scripts test --env=jsdom"
+  },
+  "devDependencies": {}
+}
diff --git a/js/repl/public/favicon.ico b/js/repl/public/favicon.ico
diff --git a/js/repl/public/index.html b/js/repl/public/index.html
@@ -0,0 +1,55 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
+    <meta name="theme-color" content="#000000">
+    <!--
+      manifest.json provides metadata used when your web app is added to the
+      homescreen on Android. See https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json">
+    <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
+
+    <!--
+      Load shared resources from CDN to maximize on caching.
+      This enables us to share assets with other REPLs (eg Prettier).
+    -->
+    <script src="https://unpkg.com/babel-standalone@^6"></script>
+    <script src="https://unpkg.com/codemirror@5/lib/codemirror.js"></script>
+    <script src="https://unpkg.com/codemirror@5/mode/javascript/javascript.js"></script>
+    <script src="https://unpkg.com/codemirror@5/mode/xml/xml.js"></script>
+    <script src="https://unpkg.com/codemirror@5/mode/jsx/jsx.js"></script>
+    <script src="https://unpkg.com/codemirror@5/keymap/sublime.js"></script>
+    <script src="https://unpkg.com/codemirror@5/addon/display/placeholder.js"></script>
+    <script src="https://unpkg.com/codemirror@5/addon/selection/active-line.js"></script>
+    <link rel="stylesheet" href="https://unpkg.com/codemirror@5//lib/codemirror.css">
+
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>Babel REPL</title>
+  </head>
+  <body>
+    <noscript>
+      You need to enable JavaScript to run this app.
+    </noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>
diff --git a/js/repl/public/manifest.json b/js/repl/public/manifest.json
@@ -0,0 +1,15 @@
+{
+  "short_name": "Babel REPL",
+  "name": "Babel REPL",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "192x192",
+      "type": "image/png"
+    }
+  ],
+  "start_url": "./index.html",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}
diff --git a/js/repl/src/CodeMirror.js b/js/repl/src/CodeMirror.js
@@ -0,0 +1,132 @@
+// @flow
+
+import { css } from 'glamor';
+import React from 'react';
+import { colors } from './styles';
+
+const DEFAULT_CODE_MIRROR_OPTIONS = {
+  autoCloseBrackets: true,
+  keyMap: 'sublime',
+  lineNumbers: true,
+  matchBrackets: true,
+  mode: 'text/jsx',
+  showCursorWhenSelecting: true,
+  styleActiveLine: true,
+  tabWidth: 2
+};
+
+type Props = {
+  autoFocus: boolean,
+  onChange: (value: string) => void,
+  options: Object,
+  placeholder?: string,
+  value: ?string,
+  preserveScrollPosition: boolean
+};
+
+export default class CodeMirror extends React.Component {
+  static defaultProps = {
+    autoFocus: false,
+    preserveScrollPosition: false,
+    onChange: (value: string) => {}
+  };
+
+  props: Props;
+  state = {
+    isFocused: false
+  };
+
+  _codeMirror: any;
+  _textAreaRef: HTMLTextAreaElement;
+
+  componentDidMount() {
+    this._codeMirror = window.CodeMirror.fromTextArea(this._textAreaRef, {
+      ...DEFAULT_CODE_MIRROR_OPTIONS,
+      ...this.props.options
+    });
+    this._codeMirror.on('change', this._onChange);
+    this._codeMirror.setValue(this.props.value || '');
+  }
+
+  componentWillUnmount() {
+    // is there a lighter-weight way to remove the cm instance?
+    if (this._codeMirror) {
+      this._codeMirror.toTextArea();
+    }
+  }
+
+  componentWillReceiveProps(nextProps: Props) {
+    if (
+      nextProps.value &&
+      nextProps.value !== this.props.value &&
+      this._codeMirror.getValue() !== nextProps.value
+    ) {
+      if (nextProps.preserveScrollPosition) {
+        var prevScrollPosition = this._codeMirror.getScrollInfo();
+        this._codeMirror.setValue(nextProps.value);
+        this._codeMirror.scrollTo(
+          prevScrollPosition.left,
+          prevScrollPosition.top
+        );
+      } else {
+        this._codeMirror.setValue(nextProps.value);
+      }
+    } else if (!nextProps.value) {
+      this._codeMirror.setValue('');
+    }
+
+    if (typeof nextProps.options === 'object') {
+      for (let optionName in nextProps.options) {
+        if (nextProps.options.hasOwnProperty(optionName)) {
+          this._updateOption(optionName, nextProps.options[optionName]);
+        }
+      }
+    }
+  }
+
+  focus() {
+    if (this._codeMirror) {
+      this._codeMirror.focus();
+    }
+  }
+
+  render() {
+    return (
+      <textarea
+        autoComplete="off"
+        autoFocus={this.props.autoFocus}
+        defaultValue={this.props.value}
+        ref={this._setTextAreaRef}
+        placeholder={this.props.placeholder}
+      />
+    );
+  }
+
+  _updateOption(optionName: string, newValue: any) {
+    const oldValue = this._codeMirror.getOption(optionName);
+
+    if (oldValue !== newValue) {
+      this._codeMirror.setOption(optionName, newValue);
+    }
+  }
+
+  _onChange = (doc: any, change: any) => {
+    if (change.origin !== 'setValue') {
+      this.props.onChange(doc.getValue());
+    }
+  };
+
+  _setTextAreaRef = (ref: HTMLTextAreaElement) => {
+    this._textAreaRef = ref;
+  };
+}
+
+css.global('.CodeMirror', {
+  height: '100% !important',
+  width: '100% !important',
+  '-webkit-overflow-scrolling': 'touch'
+});
+
+css.global('pre.CodeMirror-placeholder', {
+  color: colors.foregroundLight
+});
diff --git a/js/repl/src/CodeMirrorPanel.js b/js/repl/src/CodeMirrorPanel.js
@@ -0,0 +1,85 @@
+// @flow
+
+import { css } from 'glamor';
+import CodeMirror from './CodeMirror';
+import React from 'react';
+import { colors } from './styles';
+
+type Props = {
+  className?: string,
+  code: ?string,
+  error: ?Error,
+  info?: ?string,
+  onChange?: (value: string) => void,
+  options: Object,
+  placeholder?: string
+};
+
+export default function CodeMirrorPanel(props: Props) {
+  const { className = '', error, info, onChange } = props;
+
+  return (
+    <div className={`${styles.panel} ${className}`}>
+      <div className={styles.codeMirror}>
+        <CodeMirror
+          onChange={onChange}
+          options={{
+            ...props.options,
+            readOnly: onChange == null
+          }}
+          placeholder={props.placeholder}
+          preserveScrollPosition={onChange == null}
+          value={props.code}
+        />
+      </div>
+      {info &&
+        <pre className={styles.info}>
+          {info}
+        </pre>}
+      {error &&
+        <pre className={styles.error}>
+          {error.message}
+        </pre>}
+    </div>
+  );
+}
+
+const sharedBoxStyles = {
+  flex: '0 0 auto',
+  maxHeight: '33%',
+  overflow: 'auto',
+  margin: 0,
+  padding: '0.25rem 0.5rem',
+  whiteSpace: 'pre-wrap',
+  '-webkit-overflow-scrolling': 'touch'
+};
+
+const styles = {
+  codeMirror: css({
+    display: 'block',
+    height: '100%',
+    width: '100%',
+    overflow: 'auto'
+  }),
+  error: css({
+    order: 2,
+    backgroundColor: colors.errorBackground,
+    borderTop: `1px solid ${colors.errorBorder}`,
+    color: colors.errorForeground,
+    ...sharedBoxStyles
+  }),
+  info: css({
+    order: 1,
+    backgroundColor: colors.infoBackground,
+    borderTop: `1px solid ${colors.infoBorder}`,
+    color: colors.infoForeground,
+    ...sharedBoxStyles
+  }),
+  panel: css({
+    height: '100%',
+    display: 'flex',
+    flexDirection: 'column',
+    justifyContent: 'stretch',
+    overflow: 'auto'
+  })
+};