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import {PENDING, REDO, RESOLVED, UNDO} from './constants'; import type {History} from '../history'; /** * Offsets history by offset length * @param {History} history * @param {Integer} offsetValue */ export default function offset(history: History, offsetValue: number): Promise<History> { if (history.commandState === PENDING) { return Promise.resolve(history); } let position = history.position + offsetValue; let {state} = history; if (offsetValue < 0 && history.state !== UNDO) { position += 1; state = UNDO; } if (offsetValue > 0 && history.state !== REDO) { position -= 1; state = REDO; } if (position <= history.stack.length - 1 && position >= 0) { history.position = position; history.state = state; const entry = history.stack[position]; if (entry) { const command = history.commands[entry.command]; if (command) { history.commandState = PENDING; return command[state](entry) .then(() => { history.commandState = RESOLVED; return history; }) .catch(() => { history.commandState = RESOLVED; return offset(history, offsetValue); }); } } } return Promise.resolve(history); }