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223
ts/components/Input.tsx
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223
ts/components/Input.tsx
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import React, {
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ClipboardEvent,
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ReactNode,
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forwardRef,
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useCallback,
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useEffect,
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useRef,
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useState,
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} from 'react';
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import classNames from 'classnames';
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import * as grapheme from '../util/grapheme';
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import { LocalizerType } from '../types/Util';
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import { getClassNamesFor } from '../util/getClassNamesFor';
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import { multiRef } from '../util/multiRef';
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export type PropsType = {
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disabled?: boolean;
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expandable?: boolean;
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hasClearButton?: boolean;
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i18n: LocalizerType;
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icon?: ReactNode;
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maxGraphemeCount?: number;
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moduleClassName?: string;
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onChange: (value: string) => unknown;
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placeholder: string;
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value?: string;
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whenToShowRemainingCount?: number;
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};
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/**
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* Some inputs must have fewer than maxGraphemeCount glyphs. Ideally, we'd use the
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* `maxLength` property on inputs, but that doesn't account for glyphs that are more than
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* one UTF-16 code units. For example: `'💩💩'.length === 4`.
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*
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* This component effectively implements a "max grapheme length" on an input.
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*
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* At a high level, this component handles two methods of input:
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*
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* - `onChange`. *Before* the value is changed (in `onKeyDown`), we save the value and the
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* cursor position. Then, in `onChange`, we see if the new value is too long. If it is,
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* we revert the value and selection. Otherwise, we fire `onChangeValue`.
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*
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* - `onPaste`. If you're pasting something that will fit, we fall back to normal browser
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* behavior, which calls `onChange`. If you're pasting something that won't fit, it's a
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* noop.
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*/
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export const Input = forwardRef<
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HTMLInputElement | HTMLTextAreaElement,
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PropsType
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>(
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(
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{
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disabled,
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expandable,
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hasClearButton,
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i18n,
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icon,
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maxGraphemeCount = 0,
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moduleClassName,
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onChange,
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placeholder,
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value = '',
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whenToShowRemainingCount = Infinity,
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},
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ref
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) => {
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const innerRef = useRef<HTMLInputElement | HTMLTextAreaElement | null>(
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null
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);
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const valueOnKeydownRef = useRef<string>(value);
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const selectionStartOnKeydownRef = useRef<number>(value.length);
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const [isLarge, setIsLarge] = useState(false);
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const maybeSetLarge = useCallback(() => {
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if (!expandable) {
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return;
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}
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const inputEl = innerRef.current;
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if (!inputEl) {
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return;
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}
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if (
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inputEl.scrollHeight > inputEl.clientHeight ||
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inputEl.scrollWidth > inputEl.clientWidth
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) {
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setIsLarge(true);
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}
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}, [expandable]);
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const handleKeyDown = useCallback(() => {
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const inputEl = innerRef.current;
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if (!inputEl) {
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return;
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}
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valueOnKeydownRef.current = inputEl.value;
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selectionStartOnKeydownRef.current = inputEl.selectionStart || 0;
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}, []);
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const handleChange = useCallback(() => {
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const inputEl = innerRef.current;
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if (!inputEl) {
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return;
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}
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const newValue = inputEl.value;
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const newGraphemeCount = maxGraphemeCount ? grapheme.count(newValue) : 0;
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if (newGraphemeCount <= maxGraphemeCount) {
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onChange(newValue);
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} else {
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inputEl.value = valueOnKeydownRef.current;
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inputEl.selectionStart = selectionStartOnKeydownRef.current;
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inputEl.selectionEnd = selectionStartOnKeydownRef.current;
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}
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maybeSetLarge();
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}, [maxGraphemeCount, maybeSetLarge, onChange]);
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const handlePaste = useCallback(
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(event: ClipboardEvent<HTMLInputElement | HTMLTextAreaElement>) => {
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const inputEl = innerRef.current;
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if (!inputEl || !maxGraphemeCount) {
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return;
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}
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const selectionStart = inputEl.selectionStart || 0;
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const selectionEnd =
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inputEl.selectionEnd || inputEl.selectionStart || 0;
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const textBeforeSelection = value.slice(0, selectionStart);
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const textAfterSelection = value.slice(selectionEnd);
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const pastedText = event.clipboardData.getData('Text');
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const newGraphemeCount =
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grapheme.count(textBeforeSelection) +
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grapheme.count(pastedText) +
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grapheme.count(textAfterSelection);
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if (newGraphemeCount > maxGraphemeCount) {
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event.preventDefault();
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}
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maybeSetLarge();
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},
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[maxGraphemeCount, maybeSetLarge, value]
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);
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useEffect(() => {
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maybeSetLarge();
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}, [maybeSetLarge]);
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const graphemeCount = maxGraphemeCount ? grapheme.count(value) : -1;
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const getClassName = getClassNamesFor('Input', moduleClassName);
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const inputProps = {
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className: classNames(
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getClassName('__input'),
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icon && getClassName('__input--with-icon'),
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isLarge && getClassName('__input--large')
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),
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disabled: Boolean(disabled),
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onChange: handleChange,
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onKeyDown: handleKeyDown,
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onPaste: handlePaste,
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placeholder,
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ref: multiRef<HTMLInputElement | HTMLTextAreaElement | null>(
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ref,
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innerRef
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),
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type: 'text',
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value,
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};
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const clearButtonElement =
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hasClearButton && value ? (
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<button
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tabIndex={-1}
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className={getClassName('__clear-icon')}
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onClick={() => onChange('')}
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type="button"
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aria-label={i18n('cancel')}
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/>
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) : null;
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const graphemeCountElement = graphemeCount >= whenToShowRemainingCount && (
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<div className={getClassName('__remaining-count')}>
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{maxGraphemeCount - graphemeCount}
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</div>
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);
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return (
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<div
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className={classNames(
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getClassName('__container'),
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disabled && getClassName('__container--disabled')
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)}
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>
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{icon ? <div className={getClassName('__icon')}>{icon}</div> : null}
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{expandable ? <textarea {...inputProps} /> : <input {...inputProps} />}
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{isLarge ? (
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<>
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<div className={getClassName('__controls')}>
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{clearButtonElement}
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</div>
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<div className={getClassName('__remaining-count--large')}>
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{graphemeCountElement}
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</div>
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</>
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) : (
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<div className={getClassName('__controls')}>
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{graphemeCountElement}
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{clearButtonElement}
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</div>
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)}
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</div>
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);
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}
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);
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