Update emojis to use harmony modules (import/export)

4 files changed, 189 insertions, 173 deletions

diff --git a/app/assets/javascripts/behaviors/gl_emoji.js b/app/assets/javascripts/behaviors/gl_emoji.js
index d1d98c3919f..59741cc9b1a 100644
--- a/app/assets/javascripts/behaviors/gl_emoji.js
+++ b/app/assets/javascripts/behaviors/gl_emoji.js
@@ -1,11 +1,13 @@
-const installCustomElements = require('document-register-element');
-const emojiMap = require('emoji-map');
-const emojiAliases = require('emoji-aliases');
-const generatedUnicodeSupportMap = require('./gl_emoji/unicode_support_map');
-const spreadString = require('./gl_emoji/spread_string');
+import installCustomElements from 'document-register-element';
+import emojiMap from 'emojis/digests.json';
+import emojiAliases from 'emojis/aliases.json';
+import { getUnicodeSupportMap } from './gl_emoji/unicode_support_map';
+import { isEmojiUnicodeSupported } from './gl_emoji/is_emoji_unicode_supported';
 
 installCustomElements(window);
 
+const generatedUnicodeSupportMap = getUnicodeSupportMap();
+
 function emojiImageTag(name, src) {
   return `<img class="emoji" title=":${name}:" alt=":${name}:" src="${src}" width="20" height="20" align="absmiddle" />`;
 }
@@ -55,163 +57,49 @@ function glEmojiTag(inputName, options) {
   `;
 }
 
-// On Windows, flags render as two-letter country codes, see http://emojipedia.org/flags/
-const flagACodePoint = 127462; // parseInt('1F1E6', 16)
-const flagZCodePoint = 127487; // parseInt('1F1FF', 16)
-function isFlagEmoji(emojiUnicode) {
-  const cp = emojiUnicode.codePointAt(0);
-  // Length 4 because flags are made of 2 characters which are surrogate pairs
-  return emojiUnicode.length === 4 && cp >= flagACodePoint && cp <= flagZCodePoint;
-}
-
-// Chrome <57 renders keycaps oddly
-// See https://bugs.chromium.org/p/chromium/issues/detail?id=632294
-// Same issue on Windows also fixed in Chrome 57, http://i.imgur.com/rQF7woO.png
-function isKeycapEmoji(emojiUnicode) {
-  return emojiUnicode.length === 3 && emojiUnicode[2] === '\u20E3';
-}
-
-// Check for a skin tone variation emoji which aren't always supported
-const tone1 = 127995;// parseInt('1F3FB', 16)
-const tone5 = 127999;// parseInt('1F3FF', 16)
-function isSkinToneComboEmoji(emojiUnicode) {
-  return emojiUnicode.length > 2 && spreadString(emojiUnicode).some((char) => {
-    const cp = char.codePointAt(0);
-    return cp >= tone1 && cp <= tone5;
-  });
-}
-
-// macOS supports most skin tone emoji's but
-// doesn't support the skin tone versions of horse racing
-const horseRacingCodePoint = 127943;// parseInt('1F3C7', 16)
-function isHorceRacingSkinToneComboEmoji(emojiUnicode) {
-  return spreadString(emojiUnicode)[0].codePointAt(0) === horseRacingCodePoint &&
-    isSkinToneComboEmoji(emojiUnicode);
-}
-
-// Check for `family_*`, `kiss_*`, `couple_*`
-// For ex. Windows 8.1 Firefox 51.0.1, doesn't support these
-const zwj = 8205; // parseInt('200D', 16)
-const personStartCodePoint = 128102; // parseInt('1F466', 16)
-const personEndCodePoint = 128105; // parseInt('1F469', 16)
-function isPersonZwjEmoji(emojiUnicode) {
-  let hasPersonEmoji = false;
-  let hasZwj = false;
-  spreadString(emojiUnicode).forEach((character) => {
-    const cp = character.codePointAt(0);
-    if (cp === zwj) {
-      hasZwj = true;
-    } else if (cp >= personStartCodePoint && cp <= personEndCodePoint) {
-      hasPersonEmoji = true;
+function installGlEmojiElement() {
+  const GlEmojiElementProto = Object.create(HTMLElement.prototype);
+  GlEmojiElementProto.createdCallback = function createdCallback() {
+    const emojiUnicode = this.textContent.trim();
+    const {
+      name,
+      unicodeVersion,
+      fallbackSrc,
+      fallbackSpriteClass,
+    } = this.dataset;
+
+    const isEmojiUnicode = this.childNodes && Array.prototype.every.call(
+      this.childNodes,
+      childNode => childNode.nodeType === 3,
+    );
+    const hasImageFallback = fallbackSrc && fallbackSrc.length > 0;
+    const hasCssSpriteFalback = fallbackSpriteClass && fallbackSpriteClass.length > 0;
+
+    if (
+      isEmojiUnicode &&
+      !isEmojiUnicodeSupported(generatedUnicodeSupportMap, emojiUnicode, unicodeVersion)
+    ) {
+      // CSS sprite fallback takes precedence over image fallback
+      if (hasCssSpriteFalback) {
+        // IE 11 doesn't like adding multiple at once :(
+        this.classList.add('emoji-icon');
+        this.classList.add(fallbackSpriteClass);
+      } else if (hasImageFallback) {
+        this.innerHTML = emojiImageTag(name, fallbackSrc);
+      } else {
+        const src = assembleFallbackImageSrc(name);
+        this.innerHTML = emojiImageTag(name, src);
+      }
     }
-  });
-
-  return hasPersonEmoji && hasZwj;
-}
-
-// Helper so we don't have to run `isFlagEmoji` twice
-// in `isEmojiUnicodeSupported` logic
-function checkFlagEmojiSupport(unicodeSupportMap, emojiUnicode) {
-  const isFlagResult = isFlagEmoji(emojiUnicode);
-  return (
-    (unicodeSupportMap.flag && isFlagResult) ||
-    !isFlagResult
-  );
-}
-
-// Helper so we don't have to run `isSkinToneComboEmoji` twice
-// in `isEmojiUnicodeSupported` logic
-function checkSkinToneModifierSupport(unicodeSupportMap, emojiUnicode) {
-  const isSkinToneResult = isSkinToneComboEmoji(emojiUnicode);
-  return (
-    (unicodeSupportMap.skinToneModifier && isSkinToneResult) ||
-    !isSkinToneResult
-  );
-}
-
-// Helper func so we don't have to run `isHorceRacingSkinToneComboEmoji` twice
-// in `isEmojiUnicodeSupported` logic
-function checkHorseRacingSkinToneComboEmojiSupport(unicodeSupportMap, emojiUnicode) {
-  const isHorseRacingSkinToneResult = isHorceRacingSkinToneComboEmoji(emojiUnicode);
-  return (
-    (unicodeSupportMap.horseRacing && isHorseRacingSkinToneResult) ||
-    !isHorseRacingSkinToneResult
-  );
-}
-
-// Helper so we don't have to run `isPersonZwjEmoji` twice
-// in `isEmojiUnicodeSupported` logic
-function checkPersonEmojiSupport(unicodeSupportMap, emojiUnicode) {
-  const isPersonZwjResult = isPersonZwjEmoji(emojiUnicode);
-  return (
-    (unicodeSupportMap.personZwj && isPersonZwjResult) ||
-    !isPersonZwjResult
-  );
-}
-
-// Takes in a support map and determines whether
-// the given unicode emoji is supported on the platform.
-//
-// Combines all the edge case tests into a one-stop shop method
-function isEmojiUnicodeSupported(unicodeSupportMap = {}, emojiUnicode, unicodeVersion) {
-  const isOlderThanChrome57 = unicodeSupportMap.meta && unicodeSupportMap.meta.isChrome &&
-    unicodeSupportMap.meta.chromeVersion < 57;
+  };
 
-  // For comments about each scenario, see the comments above each individual respective function
-  return unicodeSupportMap[unicodeVersion] &&
-    !(isOlderThanChrome57 && isKeycapEmoji(emojiUnicode)) &&
-    checkFlagEmojiSupport(unicodeSupportMap, emojiUnicode) &&
-    checkSkinToneModifierSupport(unicodeSupportMap, emojiUnicode) &&
-    checkHorseRacingSkinToneComboEmojiSupport(unicodeSupportMap, emojiUnicode) &&
-    checkPersonEmojiSupport(unicodeSupportMap, emojiUnicode);
+  document.registerElement('gl-emoji', {
+    prototype: GlEmojiElementProto,
+  });
 }
 
-const GlEmojiElementProto = Object.create(HTMLElement.prototype);
-GlEmojiElementProto.createdCallback = function createdCallback() {
-  const emojiUnicode = this.textContent.trim();
-  const {
-    name,
-    unicodeVersion,
-    fallbackSrc,
-    fallbackSpriteClass,
-  } = this.dataset;
-
-  const isEmojiUnicode = this.childNodes && Array.prototype.every.call(
-    this.childNodes,
-    childNode => childNode.nodeType === 3,
-  );
-  const hasImageFallback = fallbackSrc && fallbackSrc.length > 0;
-  const hasCssSpriteFalback = fallbackSpriteClass && fallbackSpriteClass.length > 0;
-
-  if (
-    isEmojiUnicode &&
-    !isEmojiUnicodeSupported(generatedUnicodeSupportMap, emojiUnicode, unicodeVersion)
-  ) {
-    // CSS sprite fallback takes precedence over image fallback
-    if (hasCssSpriteFalback) {
-      // IE 11 doesn't like adding multiple at once :(
-      this.classList.add('emoji-icon');
-      this.classList.add(fallbackSpriteClass);
-    } else if (hasImageFallback) {
-      this.innerHTML = emojiImageTag(name, fallbackSrc);
-    } else {
-      const src = assembleFallbackImageSrc(name);
-      this.innerHTML = emojiImageTag(name, src);
-    }
-  }
-};
-
-document.registerElement('gl-emoji', {
-  prototype: GlEmojiElementProto,
-});
-
-module.exports = {
-  emojiImageTag,
+export {
+  installGlEmojiElement,
   glEmojiTag,
-  isEmojiUnicodeSupported,
-  isFlagEmoji,
-  isKeycapEmoji,
-  isSkinToneComboEmoji,
-  isHorceRacingSkinToneComboEmoji,
-  isPersonZwjEmoji,
+  emojiImageTag,
 };
diff --git a/app/assets/javascripts/behaviors/gl_emoji/is_emoji_unicode_supported.js b/app/assets/javascripts/behaviors/gl_emoji/is_emoji_unicode_supported.js
new file mode 100644
index 00000000000..5e3c45f7e92
--- /dev/null
+++ b/app/assets/javascripts/behaviors/gl_emoji/is_emoji_unicode_supported.js
@@ -0,0 +1,121 @@
+import spreadString from './spread_string';
+
+// On Windows, flags render as two-letter country codes, see http://emojipedia.org/flags/
+const flagACodePoint = 127462; // parseInt('1F1E6', 16)
+const flagZCodePoint = 127487; // parseInt('1F1FF', 16)
+function isFlagEmoji(emojiUnicode) {
+  const cp = emojiUnicode.codePointAt(0);
+  // Length 4 because flags are made of 2 characters which are surrogate pairs
+  return emojiUnicode.length === 4 && cp >= flagACodePoint && cp <= flagZCodePoint;
+}
+
+// Chrome <57 renders keycaps oddly
+// See https://bugs.chromium.org/p/chromium/issues/detail?id=632294
+// Same issue on Windows also fixed in Chrome 57, http://i.imgur.com/rQF7woO.png
+function isKeycapEmoji(emojiUnicode) {
+  return emojiUnicode.length === 3 && emojiUnicode[2] === '\u20E3';
+}
+
+// Check for a skin tone variation emoji which aren't always supported
+const tone1 = 127995;// parseInt('1F3FB', 16)
+const tone5 = 127999;// parseInt('1F3FF', 16)
+function isSkinToneComboEmoji(emojiUnicode) {
+  return emojiUnicode.length > 2 && spreadString(emojiUnicode).some((char) => {
+    const cp = char.codePointAt(0);
+    return cp >= tone1 && cp <= tone5;
+  });
+}
+
+// macOS supports most skin tone emoji's but
+// doesn't support the skin tone versions of horse racing
+const horseRacingCodePoint = 127943;// parseInt('1F3C7', 16)
+function isHorceRacingSkinToneComboEmoji(emojiUnicode) {
+  return spreadString(emojiUnicode)[0].codePointAt(0) === horseRacingCodePoint &&
+    isSkinToneComboEmoji(emojiUnicode);
+}
+
+// Check for `family_*`, `kiss_*`, `couple_*`
+// For ex. Windows 8.1 Firefox 51.0.1, doesn't support these
+const zwj = 8205; // parseInt('200D', 16)
+const personStartCodePoint = 128102; // parseInt('1F466', 16)
+const personEndCodePoint = 128105; // parseInt('1F469', 16)
+function isPersonZwjEmoji(emojiUnicode) {
+  let hasPersonEmoji = false;
+  let hasZwj = false;
+  spreadString(emojiUnicode).forEach((character) => {
+    const cp = character.codePointAt(0);
+    if (cp === zwj) {
+      hasZwj = true;
+    } else if (cp >= personStartCodePoint && cp <= personEndCodePoint) {
+      hasPersonEmoji = true;
+    }
+  });
+
+  return hasPersonEmoji && hasZwj;
+}
+
+// Helper so we don't have to run `isFlagEmoji` twice
+// in `isEmojiUnicodeSupported` logic
+function checkFlagEmojiSupport(unicodeSupportMap, emojiUnicode) {
+  const isFlagResult = isFlagEmoji(emojiUnicode);
+  return (
+    (unicodeSupportMap.flag && isFlagResult) ||
+    !isFlagResult
+  );
+}
+
+// Helper so we don't have to run `isSkinToneComboEmoji` twice
+// in `isEmojiUnicodeSupported` logic
+function checkSkinToneModifierSupport(unicodeSupportMap, emojiUnicode) {
+  const isSkinToneResult = isSkinToneComboEmoji(emojiUnicode);
+  return (
+    (unicodeSupportMap.skinToneModifier && isSkinToneResult) ||
+    !isSkinToneResult
+  );
+}
+
+// Helper func so we don't have to run `isHorceRacingSkinToneComboEmoji` twice
+// in `isEmojiUnicodeSupported` logic
+function checkHorseRacingSkinToneComboEmojiSupport(unicodeSupportMap, emojiUnicode) {
+  const isHorseRacingSkinToneResult = isHorceRacingSkinToneComboEmoji(emojiUnicode);
+  return (
+    (unicodeSupportMap.horseRacing && isHorseRacingSkinToneResult) ||
+    !isHorseRacingSkinToneResult
+  );
+}
+
+// Helper so we don't have to run `isPersonZwjEmoji` twice
+// in `isEmojiUnicodeSupported` logic
+function checkPersonEmojiSupport(unicodeSupportMap, emojiUnicode) {
+  const isPersonZwjResult = isPersonZwjEmoji(emojiUnicode);
+  return (
+    (unicodeSupportMap.personZwj && isPersonZwjResult) ||
+    !isPersonZwjResult
+  );
+}
+
+// Takes in a support map and determines whether
+// the given unicode emoji is supported on the platform.
+//
+// Combines all the edge case tests into a one-stop shop method
+function isEmojiUnicodeSupported(unicodeSupportMap = {}, emojiUnicode, unicodeVersion) {
+  const isOlderThanChrome57 = unicodeSupportMap.meta && unicodeSupportMap.meta.isChrome &&
+    unicodeSupportMap.meta.chromeVersion < 57;
+
+  // For comments about each scenario, see the comments above each individual respective function
+  return unicodeSupportMap[unicodeVersion] &&
+    !(isOlderThanChrome57 && isKeycapEmoji(emojiUnicode)) &&
+    checkFlagEmojiSupport(unicodeSupportMap, emojiUnicode) &&
+    checkSkinToneModifierSupport(unicodeSupportMap, emojiUnicode) &&
+    checkHorseRacingSkinToneComboEmojiSupport(unicodeSupportMap, emojiUnicode) &&
+    checkPersonEmojiSupport(unicodeSupportMap, emojiUnicode);
+}
+
+export {
+  isEmojiUnicodeSupported,
+  isFlagEmoji,
+  isKeycapEmoji,
+  isSkinToneComboEmoji,
+  isHorceRacingSkinToneComboEmoji,
+  isPersonZwjEmoji,
+};
diff --git a/app/assets/javascripts/behaviors/gl_emoji/spread_string.js b/app/assets/javascripts/behaviors/gl_emoji/spread_string.js
index 2380349c4fa..327764ec6e9 100644
--- a/app/assets/javascripts/behaviors/gl_emoji/spread_string.js
+++ b/app/assets/javascripts/behaviors/gl_emoji/spread_string.js
@@ -47,4 +47,4 @@ function spreadString(str) {
   return arr;
 }
 
-module.exports = spreadString;
+export default spreadString;
diff --git a/app/assets/javascripts/behaviors/gl_emoji/unicode_support_map.js b/app/assets/javascripts/behaviors/gl_emoji/unicode_support_map.js
index f31716d4c07..aa522e20c36 100644
--- a/app/assets/javascripts/behaviors/gl_emoji/unicode_support_map.js
+++ b/app/assets/javascripts/behaviors/gl_emoji/unicode_support_map.js
@@ -68,7 +68,7 @@ const chromeVersion = chromeMatches && chromeMatches[1] && parseInt(chromeMatche
 // See 32px, https://i.imgur.com/htY6Zym.png
 // See 16px, https://i.imgur.com/FPPsIF8.png
 const fontSize = 16;
-function testUnicodeSupportMap(testMap) {
+function generateUnicodeSupportMap(testMap) {
   const testMapKeys = Object.keys(testMap);
   const numTestEntries = testMapKeys
     .reduce((list, testKey) => list.concat(testMap[testKey]), []).length;
@@ -138,17 +138,24 @@ function testUnicodeSupportMap(testMap) {
   return resultMap;
 }
 
-let unicodeSupportMap;
-const userAgentFromCache = window.localStorage.getItem('gl-emoji-user-agent');
-try {
-  unicodeSupportMap = JSON.parse(window.localStorage.getItem('gl-emoji-unicode-support-map'));
-} catch (err) {
-  // swallow
-}
-if (!unicodeSupportMap || userAgentFromCache !== navigator.userAgent) {
-  unicodeSupportMap = testUnicodeSupportMap(unicodeSupportTestMap);
-  window.localStorage.setItem('gl-emoji-user-agent', navigator.userAgent);
-  window.localStorage.setItem('gl-emoji-unicode-support-map', JSON.stringify(unicodeSupportMap));
+function getUnicodeSupportMap() {
+  let unicodeSupportMap;
+  const userAgentFromCache = window.localStorage.getItem('gl-emoji-user-agent');
+  try {
+    unicodeSupportMap = JSON.parse(window.localStorage.getItem('gl-emoji-unicode-support-map'));
+  } catch (err) {
+    // swallow
+  }
+  if (!unicodeSupportMap || userAgentFromCache !== navigator.userAgent) {
+    unicodeSupportMap = generateUnicodeSupportMap(unicodeSupportTestMap);
+    window.localStorage.setItem('gl-emoji-user-agent', navigator.userAgent);
+    window.localStorage.setItem('gl-emoji-unicode-support-map', JSON.stringify(unicodeSupportMap));
+  }
+
+  return unicodeSupportMap;
 }
 
-module.exports = unicodeSupportMap;
+export {
+  getUnicodeSupportMap,
+  generateUnicodeSupportMap,
+};