src/vs/base/common/navigator.ts

50 LOC · 50 covered · 0 uncovered · 15 ranges · 49 concepts · 7 introducers · 27 tests

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  /*---------------------------------------------------------------------------------------------
  
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   *  Copyright (c) Microsoft Corporation. All rights reserved.
  
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   *  Licensed under the MIT License. See License.txt in the project root for license information.
  
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   *--------------------------------------------------------------------------------------------*/
  
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  export interface INavigator<T> {
  
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  	current(): T | null;
  
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  	previous(): T | null;
  
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  	first(): T | null;
  
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  	last(): T | null;
  
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  	next(): T | null;
  
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  }
  
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  export class ArrayNavigator<T> implements INavigator<T> {
  
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  	constructor(
  
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  		private readonly items: readonly T[],
  
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  		protected start: number = 0,
  
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  		protected end: number = items.length,
  
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  		protected index = start - 1
  
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  	) { }
  
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  	current(): T | null {
  
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  		if (this.index === this.start - 1 || this.index === this.end) {
  
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  			return null;
  
navigator.ts ×1

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  		}
  
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  		return this.items[this.index];
  
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  	}
  
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  	next(): T | null {
  
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  		this.index = Math.min(this.index + 1, this.end);
  
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  		return this.current();
  
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  	}
  
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  	previous(): T | null {
  
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  		this.index = Math.max(this.index - 1, this.start - 1);
  
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  		return this.current();
  
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  	}
  
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  	first(): T | null {
  
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  		this.index = this.start;
  
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  		return this.current();
  
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  	}
  
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  	last(): T | null {
  
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  		this.index = this.end - 1;
  
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  		return this.current();
  
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  	}
  
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  }
  
history.ts ×31