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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | 1x 6x 6x 6x 14x 14x 18x 18x 7x 7x 25x 8x | import BoundedHistoryIterator from 'emulator/plugins/BoundedHistoryIterator'; export default class HistoryKeyboardPlugin { constructor(state) { this._nullableHistoryIterator = null; this.historyStack = state.getHistory(); } // Plugin contract onExecuteStarted(state, str) { // no-op } // Plugin contract onExecuteCompleted(state) { this._nullableHistoryIterator = null; this.historyStack = state.getHistory(); } // Plugin API completeUp() { this.createHistoryIteratorIfNull(); return this._nullableHistoryIterator.up(); } completeDown() { this.createHistoryIteratorIfNull(); return this._nullableHistoryIterator.down(); } // Private methods createHistoryIteratorIfNull() { if (!this._nullableHistoryIterator) { this._nullableHistoryIterator = new BoundedHistoryIterator( this.historyStack ); } } } |