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Merge pull request #31 from osdevisnot/ts-port
fixes #30: auto generate type definitions from source
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,18 @@ | ||
declare class LRU<T = any> { | ||
private first; | ||
private items; | ||
private last; | ||
private max; | ||
private size; | ||
private ttl; | ||
constructor(max?: number, ttl?: number); | ||
has(key: string): boolean; | ||
clear(): this; | ||
delete(key: string): this; | ||
evict(): this; | ||
get(key: string): T; | ||
keys(): string[]; | ||
set(key: string, value: T, bypass?: boolean): this; | ||
} | ||
export default function factory(max?: number, ttl?: number): LRU<any>; | ||
export {}; |
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@@ -1,151 +1,120 @@ | ||
'use strict'; | ||
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class LRU { | ||
constructor (max = 0, ttl = 0) { | ||
this.first = null; | ||
this.items = {}; | ||
this.last = null; | ||
this.max = max; | ||
this.size = 0; | ||
this.ttl = ttl; | ||
} | ||
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has (key) { | ||
return key in this.items; | ||
} | ||
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clear () { | ||
this.first = null; | ||
this.items = {}; | ||
this.last = null; | ||
this.size = 0; | ||
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return this; | ||
} | ||
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delete (key) { | ||
if (this.has(key)) { | ||
const item = this.items[key]; | ||
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delete this.items[key]; | ||
this.size--; | ||
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if (item.prev !== null) { | ||
item.prev.next = item.next; | ||
} | ||
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if (item.next !== null) { | ||
item.next.prev = item.prev; | ||
} | ||
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if (this.first === item) { | ||
this.first = item.next; | ||
} | ||
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if (this.last === item) { | ||
this.last = item.prev; | ||
} | ||
} | ||
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return this; | ||
} | ||
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evict () { | ||
const item = this.first; | ||
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delete this.items[item.key]; | ||
this.first = item.next; | ||
this.first.prev = null; | ||
this.size--; | ||
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return this; | ||
} | ||
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get (key) { | ||
let result; | ||
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if (this.has(key)) { | ||
const item = this.items[key]; | ||
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if (this.ttl > 0 && item.expiry <= new Date().getTime()) { | ||
this.delete(key); | ||
} else { | ||
result = item.value; | ||
this.set(key, result, true); | ||
} | ||
} | ||
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return result; | ||
} | ||
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keys () { | ||
return Object.keys(this.items); | ||
} | ||
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set (key, value, bypass = false) { | ||
let item; | ||
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if (bypass || this.has(key)) { | ||
item = this.items[key]; | ||
item.value = value; | ||
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if (this.last !== item) { | ||
const last = this.last, | ||
next = item.next, | ||
prev = item.prev; | ||
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if (this.first === item) { | ||
this.first = item.next; | ||
} | ||
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item.next = null; | ||
item.prev = this.last; | ||
last.next = item; | ||
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if (prev !== null) { | ||
prev.next = next; | ||
} | ||
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if (next !== null) { | ||
next.prev = prev; | ||
} | ||
} | ||
} else { | ||
if (this.max > 0 && this.size === this.max) { | ||
this.evict(); | ||
} | ||
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item = this.items[key] = { | ||
expiry: this.ttl > 0 ? new Date().getTime() + this.ttl : this.ttl, | ||
key: key, | ||
prev: this.last, | ||
next: null, | ||
value | ||
}; | ||
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if (++this.size === 1) { | ||
this.first = item; | ||
} else { | ||
this.last.next = item; | ||
} | ||
} | ||
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this.last = item; | ||
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return this; | ||
} | ||
} | ||
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function factory (max = 1000, ttl = 0) { | ||
if (isNaN(max) || max < 0) { | ||
throw new TypeError("Invalid max value"); | ||
} | ||
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if (isNaN(ttl) || ttl < 0) { | ||
throw new TypeError("Invalid ttl value"); | ||
} | ||
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return new LRU(max, ttl); | ||
} | ||
class LRU { | ||
constructor(max = 0, ttl = 0) { | ||
this.first = null; | ||
this.items = {}; | ||
this.last = null; | ||
this.max = max; | ||
this.size = 0; | ||
this.ttl = ttl; | ||
} | ||
has(key) { | ||
return key in this.items; | ||
} | ||
clear() { | ||
this.first = null; | ||
this.items = {}; | ||
this.last = null; | ||
this.size = 0; | ||
return this; | ||
} | ||
delete(key) { | ||
if (this.has(key)) { | ||
const item = this.items[key]; | ||
delete this.items[key]; | ||
this.size--; | ||
if (item.prev !== null) { | ||
item.prev.next = item.next; | ||
} | ||
if (item.next !== null) { | ||
item.next.prev = item.prev; | ||
} | ||
if (this.first === item) { | ||
this.first = item.next; | ||
} | ||
if (this.last === item) { | ||
this.last = item.prev; | ||
} | ||
} | ||
return this; | ||
} | ||
evict() { | ||
const item = this.first; | ||
delete this.items[item.key]; | ||
this.first = item.next; | ||
this.first.prev = null; | ||
this.size--; | ||
return this; | ||
} | ||
get(key) { | ||
let result; | ||
if (this.has(key)) { | ||
const item = this.items[key]; | ||
if (this.ttl > 0 && item.expiry <= new Date().getTime()) { | ||
this.delete(key); | ||
} | ||
else { | ||
result = item.value; | ||
this.set(key, result, true); | ||
} | ||
} | ||
return result; | ||
} | ||
keys() { | ||
return Object.keys(this.items); | ||
} | ||
set(key, value, bypass = false) { | ||
let item; | ||
if (bypass || this.has(key)) { | ||
item = this.items[key]; | ||
item.value = value; | ||
if (this.last !== item) { | ||
const last = this.last, next = item.next, prev = item.prev; | ||
if (this.first === item) { | ||
this.first = item.next; | ||
} | ||
item.next = null; | ||
item.prev = this.last; | ||
last.next = item; | ||
if (prev !== null) { | ||
prev.next = next; | ||
} | ||
if (next !== null) { | ||
next.prev = prev; | ||
} | ||
} | ||
} | ||
else { | ||
if (this.max > 0 && this.size === this.max) { | ||
this.evict(); | ||
} | ||
item = this.items[key] = { | ||
expiry: this.ttl > 0 ? new Date().getTime() + this.ttl : this.ttl, | ||
key: key, | ||
prev: this.last, | ||
next: null, | ||
value | ||
}; | ||
if (++this.size === 1) { | ||
this.first = item; | ||
} | ||
else { | ||
this.last.next = item; | ||
} | ||
} | ||
this.last = item; | ||
return this; | ||
} | ||
} | ||
function factory(max = 1000, ttl = 0) { | ||
if (isNaN(max) || max < 0) { | ||
throw new TypeError("Invalid max value"); | ||
} | ||
if (isNaN(ttl) || ttl < 0) { | ||
throw new TypeError("Invalid ttl value"); | ||
} | ||
return new LRU(max, ttl); | ||
} | ||
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module.exports = factory; |
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