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This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle. If not, see <http://www.gnu.org/licenses/>.\n\n/**\n * Emoji auto complete.\n *\n * @copyright 2019 Ryan Wyllie <ryan@moodle.com>\n * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\nimport * as EmojiData from 'core/emoji/data';\nimport {render as renderTemplate} from 'core/templates';\nimport {debounce} from 'core/utils';\nimport LocalStorage from 'core/localstorage';\nimport KeyCodes from 'core/key_codes';\n\nconst INPUT_DEBOUNCE_TIMER = 200;\nconst SUGGESTION_LIMIT = 50;\nconst MAX_RECENT_COUNT = 27;\nconst RECENT_EMOJIS_STORAGE_KEY = 'moodle-recent-emojis';\n\nconst SELECTORS = {\n EMOJI_BUTTON: '[data-region=\"emoji-button\"]',\n ACTIVE_EMOJI_BUTTON: '[data-region=\"emoji-button\"].active',\n};\n\n/**\n * Get the list of recent emojis data from local storage.\n *\n * @return {Array}\n */\nconst getRecentEmojis = () => {\n const storedData = LocalStorage.get(RECENT_EMOJIS_STORAGE_KEY);\n return storedData ? JSON.parse(storedData) : [];\n};\n\n/**\n * Add an emoji data to the set of recent emojis. The new set of recent emojis are\n * saved in local storage.\n *\n * @param {String} unified The char chodes for the emoji\n * @param {String} shortName The emoji short name\n */\nconst addRecentEmoji = (unified, shortName) => {\n const newEmoji = {\n unified,\n shortnames: [shortName]\n };\n const recentEmojis = getRecentEmojis();\n // Add the new emoji to the start of the list of recent emojis.\n let newRecentEmojis = [newEmoji, ...recentEmojis.filter(emoji => emoji.unified != newEmoji.unified)];\n // Limit the number of recent emojis.\n newRecentEmojis = newRecentEmojis.slice(0, MAX_RECENT_COUNT);\n\n LocalStorage.set(RECENT_EMOJIS_STORAGE_KEY, JSON.stringify(newRecentEmojis));\n};\n\n/**\n * Get the actual emoji string from the short name.\n *\n * @param {String} shortName Emoji short name\n * @return {String|null}\n */\nconst getEmojiTextFromShortName = (shortName) => {\n const unified = EmojiData.byShortName[shortName];\n\n if (unified) {\n const charCodes = unified.split('-').map(code => `0x${code}`);\n return String.fromCodePoint.apply(null, charCodes);\n } else {\n return null;\n }\n};\n\n/**\n * Render the auto complete list for the given short names.\n *\n * @param {Element} root The root container for the emoji auto complete\n * @param {Array} shortNames The list of short names for emoji suggestions to show\n */\nconst render = async (root, shortNames) => {\n const renderContext = {\n emojis: shortNames.map((shortName, index) => {\n return {\n active: index === 0,\n emojitext: getEmojiTextFromShortName(shortName),\n displayshortname: `:${shortName}:`,\n shortname: shortName,\n unified: EmojiData.byShortName[shortName]\n };\n })\n };\n const html = await renderTemplate('core/emoji/auto_complete', renderContext);\n root.innerHTML = html;\n};\n\n/**\n * Get the list of emoji short names that include the given search term. If\n * the search term is an empty string then the list of recently used emojis\n * will be returned.\n *\n * @param {String} searchTerm Text to match on\n * @param {Number} limit Maximum number of results to return\n * @return {Array}\n */\nconst searchEmojis = (searchTerm, limit) => {\n if (searchTerm === '') {\n return getRecentEmojis().map(data => data.shortnames[0]).slice(0, limit);\n } else {\n searchTerm = searchTerm.toLowerCase();\n return Object.keys(EmojiData.byShortName)\n .filter(shortName => shortName.includes(searchTerm))\n .slice(0, limit);\n }\n};\n\n/**\n * Get the current word at the given position (index) within the text.\n *\n * @param {String} text The text to process\n * @param {Number} position The position (index) within the text to match the word\n * @return {String}\n */\nconst getWordFromPosition = (text, position) => {\n const startMatches = text.slice(0, position).match(/(\\S*)$/);\n const endMatches = text.slice(position).match(/^(\\S*)/);\n let startText = '';\n let endText = '';\n\n if (startMatches) {\n startText = startMatches[startMatches.length - 1];\n }\n\n if (endMatches) {\n endText = endMatches[endMatches.length - 1];\n }\n\n return `${startText}${endText}`;\n};\n\n/**\n * Check if the given text is a full short name, i.e. has leading and trialing colon\n * characters.\n *\n * @param {String} text The text to process\n * @return {Bool}\n */\nconst isCompleteShortName = text => /^:[^:\\s]+:$/.test(text);\n\n/**\n * Check if the given text is a partial short name, i.e. has a leading colon but no\n * trailing colon.\n *\n * @param {String} text The text to process\n * @return {Bool}\n */\nconst isPartialShortName = text => /^:[^:\\s]*$/.test(text);\n\n/**\n * Remove the colon characters from the given text.\n *\n * @param {String} text The text to process\n * @return {String}\n */\nconst getShortNameFromText = text => text.replace(/:/g, '');\n\n/**\n * Get the currently active emoji button element in the list of suggestions.\n *\n * @param {Element} root The emoji auto complete container element\n * @return {Element|null}\n */\nconst getActiveEmojiSuggestion = (root) => {\n return root.querySelector(SELECTORS.ACTIVE_EMOJI_BUTTON);\n};\n\n/**\n * Make the previous sibling of the current active emoji active.\n *\n * @param {Element} root The emoji auto complete container element\n */\nconst selectPreviousEmojiSuggestion = (root) => {\n const activeEmojiSuggestion = getActiveEmojiSuggestion(root);\n const previousSuggestion = activeEmojiSuggestion.previousElementSibling;\n\n if (previousSuggestion) {\n activeEmojiSuggestion.classList.remove('active');\n previousSuggestion.classList.add('active');\n previousSuggestion.scrollIntoView({behaviour: 'smooth', inline: 'center'});\n }\n};\n\n/**\n * Make the next sibling to the current active emoji active.\n *\n * @param {Element} root The emoji auto complete container element\n */\nconst selectNextEmojiSuggestion = (root) => {\n const activeEmojiSuggestion = getActiveEmojiSuggestion(root);\n const nextSuggestion = activeEmojiSuggestion.nextElementSibling;\n\n if (nextSuggestion) {\n activeEmojiSuggestion.classList.remove('active');\n nextSuggestion.classList.add('active');\n nextSuggestion.scrollIntoView({behaviour: 'smooth', inline: 'center'});\n }\n};\n\n/**\n * Trigger the select callback for the given emoji button element.\n *\n * @param {Element} element The emoji button element\n * @param {Function} selectCallback The callback for when the user selects an emoji\n */\nconst selectEmojiElement = (element, selectCallback) => {\n const shortName = element.getAttribute('data-short-name');\n const unified = element.getAttribute('data-unified');\n addRecentEmoji(unified, shortName);\n selectCallback(element.innerHTML.trim());\n};\n\n/**\n * Initialise the emoji auto complete.\n *\n * @param {Element} root The root container element for the auto complete\n * @param {Element} textArea The text area element to monitor for auto complete\n * @param {Function} hasSuggestionCallback Callback for when there are auto-complete suggestions\n * @param {Function} selectCallback Callback for when the user selects an emoji\n */\nexport default (root, textArea, hasSuggestionCallback, selectCallback) => {\n let hasSuggestions = false;\n let previousSearchText = '';\n\n // Debounce the listener so that each keypress delays the execution of the handler. 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