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import { useLexicalComposerContext } from "@lexical/react/LexicalComposerContext";
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import {
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LexicalTypeaheadMenuPlugin,
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TypeaheadOption,
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useBasicTypeaheadTriggerMatch,
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} from "@lexical/react/LexicalTypeaheadMenuPlugin";
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import type { LexicalEditor } from "lexical";
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import { TextNode } from "lexical";
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import { useCallback, useEffect, useMemo, useState } from "react";
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import { createPortal } from "react-dom";
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import { classNames } from "@calcom/lib";
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import { useLocale } from "@calcom/lib/hooks/useLocale";
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import { VariableNode, $createVariableNode } from "../nodes/VariableNode";
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function $findAndTransformVariable(node: TextNode): null | TextNode {
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const text = node.getTextContent();
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const regex = /\{[^}]+\}/g; // Regular expression to match {VARIABLE_NAME <whatever>}
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let match;
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// Iterate over the text content
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for (let i = 0; i < text.length; i++) {
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regex.lastIndex = i; // Set the regex search position to the current index
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match = regex.exec(text);
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if (match !== null) {
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const matchedText = match[0]; // The entire matched text {VARIABLE_NAME <whatever here>}
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const matchIndex = match.index; // Start index of the matched text
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// Ensure that we move the loop index past the current match
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i = matchIndex + matchedText.length - 1;
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let targetNode;
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if (matchIndex === 0) {
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[targetNode] = node.splitText(matchIndex + matchedText.length);
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} else {
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[, targetNode] = node.splitText(matchIndex, matchIndex + matchedText.length);
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}
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const variableNode = $createVariableNode(matchedText);
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targetNode.replace(variableNode);
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return variableNode;
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}
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}
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return null;
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}
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function useVariablesTransform(editor: LexicalEditor): void {
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useEffect(() => {
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if (!editor.hasNodes([VariableNode])) {
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console.error("VariableNode is not registered in the editor");
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return;
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}
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return editor.registerNodeTransform(TextNode, (node) => {
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let targetNode: TextNode | null = node;
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while (targetNode !== null) {
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if (!targetNode.isSimpleText()) {
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return;
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}
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targetNode = $findAndTransformVariable(targetNode);
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}
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});
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}, [editor]);
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}
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class VariableTypeaheadOption extends TypeaheadOption {
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name: string;
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constructor(name: string) {
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super(name);
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this.name = name;
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}
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}
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interface AddVariablesPluginProps {
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variables: string[];
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}
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export default function AddVariablesPlugin({ variables }: AddVariablesPluginProps): JSX.Element | null {
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const { t } = useLocale();
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const [editor] = useLexicalComposerContext();
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useVariablesTransform(editor);
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const [queryString, setQueryString] = useState<string | null>(null);
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const checkForTriggerMatch = useBasicTypeaheadTriggerMatch("{", {
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minLength: 0,
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});
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const options = useMemo(() => {
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return variables
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.filter((variable) => variable.toLowerCase().includes(queryString?.toLowerCase() ?? ""))
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.map((result) => new VariableTypeaheadOption(result));
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}, [variables, queryString]);
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const onSelectOption = useCallback(
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(selectedOption: VariableTypeaheadOption, nodeToReplace: TextNode | null, closeMenu: () => void) => {
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editor.update(() => {
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const variableNode = $createVariableNode(
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`{${t(`${selectedOption.name}_variable`).toUpperCase().replace(/ /g, "_")}}`
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);
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if (nodeToReplace) {
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nodeToReplace.replace(variableNode);
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}
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variableNode.select();
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closeMenu();
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});
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},
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[editor, t]
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);
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return (
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<LexicalTypeaheadMenuPlugin<VariableTypeaheadOption>
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onQueryChange={setQueryString}
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onSelectOption={onSelectOption}
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triggerFn={checkForTriggerMatch}
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options={options}
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menuRenderFn={(anchorElementRef, { selectedIndex, selectOptionAndCleanUp, setHighlightedIndex }) =>
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anchorElementRef.current && options.length
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? createPortal(
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<div
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className={classNames(
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"shadow-dropdown bg-default border-subtle mt-5 w-64 overflow-hidden rounded-md border",
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"typeahead-popover" // class required by Lexical
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)}>
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<ul className="max-h-64 list-none overflow-y-scroll md:max-h-80">
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{options.map((option, index) => (
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<li
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id={`typeahead-item-${index}`}
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key={option.key}
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aria-selected={selectedIndex === index}
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tabIndex={-1}
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className="focus:ring-brand-800 hover:bg-subtle hover:text-emphasis text-default aria-selected:bg-subtle aria-selected:text-emphasis cursor-pointer px-4 py-2 text-sm outline-none ring-inset first-of-type:rounded-t-[inherit] last-of-type:rounded-b-[inherit] focus:outline-none focus:ring-1"
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ref={option.setRefElement}
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role="option"
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onClick={() => {
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setHighlightedIndex(index);
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selectOptionAndCleanUp(option);
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}}
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onMouseEnter={() => {
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setHighlightedIndex(index);
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}}>
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<p className="text-sm font-semibold">
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{`{${t(`${option.name}_variable`).toUpperCase().replace(/ /g, "_")}}`}
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</p>
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<span className="text-default text-sm">{t(`${option.name}_info`)}</span>
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</li>
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))}
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</ul>
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</div>,
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anchorElementRef.current
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)
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: null
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}
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/>
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);
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}
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