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Prompt.ts
111 lines (98 loc) · 2.63 KB
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Prompt.ts
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/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import {ScrollOptions} from '../types';
import {KEYS} from '../constants';
export default class Prompt {
private _entering: boolean;
private _value: string;
private _onChange: () => void;
private _onSuccess: (value: string) => void;
private _onCancel: (value: string) => void;
private _offset: number;
private _promptLength: number;
private _selection: string | null;
constructor() {
// Copied from `enter` to satisfy TS
this._entering = true;
this._value = '';
this._selection = null;
this._offset = -1;
this._promptLength = 0;
this._onChange = () => {};
this._onSuccess = () => {};
this._onCancel = () => {};
}
private _onResize = () => {
this._onChange();
};
enter(
onChange: (pattern: string, options: ScrollOptions) => void,
onSuccess: (pattern: string) => void,
onCancel: () => void,
) {
this._entering = true;
this._value = '';
this._onSuccess = onSuccess;
this._onCancel = onCancel;
this._selection = null;
this._offset = -1;
this._promptLength = 0;
this._onChange = () =>
onChange(this._value, {
max: 10,
offset: this._offset,
});
this._onChange();
process.stdout.on('resize', this._onResize);
}
setPromptLength(length: number) {
this._promptLength = length;
}
setPromptSelection(selected: string) {
this._selection = selected;
}
put(key: string) {
switch (key) {
case KEYS.ENTER:
this._entering = false;
this._onSuccess(this._selection || this._value);
this.abort();
break;
case KEYS.ESCAPE:
this._entering = false;
this._onCancel(this._value);
this.abort();
break;
case KEYS.ARROW_DOWN:
this._offset = Math.min(this._offset + 1, this._promptLength - 1);
this._onChange();
break;
case KEYS.ARROW_UP:
this._offset = Math.max(this._offset - 1, -1);
this._onChange();
break;
case KEYS.ARROW_LEFT:
case KEYS.ARROW_RIGHT:
break;
default:
this._value =
key === KEYS.BACKSPACE ? this._value.slice(0, -1) : this._value + key;
this._offset = -1;
this._selection = null;
this._onChange();
break;
}
}
abort() {
this._entering = false;
this._value = '';
process.stdout.removeListener('resize', this._onResize);
}
isEntering() {
return this._entering;
}
}