/* Copyright (c) 2012-2022 The ANTLR Project Contributors. All rights reserved.

* Use is of this file is governed by the BSD 3-clause license that

* can be found in the LICENSE.txt file in the project root.

*/

import { stringHashCode } from "../utils/stringHashCode.js";

export default class HashCode {

constructor() {

this.count = 0;

this.hash = 0;

}

update() {

for(let i=0;i<arguments.length;i++) {

let value = arguments[i];

if (value == null)

continue;

if(Array.isArray(value))

this.update.apply(this, value);

else {

let k = 0;

switch (typeof(value)) {

case 'undefined':

case 'function':

continue;

case 'number':

case 'boolean':

k = value;

break;

case 'string':

k = stringHashCode(value);

break;

default:

if(value.updateHashCode)

value.updateHashCode(this);

else

console.log("No updateHashCode for " + value.toString())

continue;

}

k = k * 0xCC9E2D51;

k = (k << 15) | (k >>> (32 - 15));

k = k * 0x1B873593;

this.count = this.count + 1;

let hash = this.hash ^ k;

hash = (hash << 13) | (hash >>> (32 - 13));

hash = hash * 5 + 0xE6546B64;

this.hash = hash;

}

}

}

finish() {

let hash = this.hash ^ (this.count * 4);

hash = hash ^ (hash >>> 16);

hash = hash * 0x85EBCA6B;

hash = hash ^ (hash >>> 13);

hash = hash * 0xC2B2AE35;

hash = hash ^ (hash >>> 16);

return hash;

}

static hashStuff() {

let hash = new HashCode();

hash.update.apply(hash, arguments);

return hash.finish();

}

}