Files F95322818

hash-sum.js
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Created: Sat, Dec 14, 17:28

hash-sum.js
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	'use strict';

	function pad (hash, len) {
	while (hash.length < len) {
	hash = '0' + hash;
	}
	return hash;
	}

	function fold (hash, text) {
	var i;
	var chr;
	var len;
	if (text.length === 0) {
	return hash;
	}
	for (i = 0, len = text.length; i < len; i++) {
	chr = text.charCodeAt(i);
	hash = ((hash << 5) - hash) + chr;
	hash \|= 0;
	}
	return hash < 0 ? hash * -2 : hash;
	}

	function foldObject (hash, o, seen) {
	return Object.keys(o).sort().reduce(foldKey, hash);
	function foldKey (hash, key) {
	return foldValue(hash, o[key], key, seen);
	}
	}

	function foldValue (input, value, key, seen) {
	var hash = fold(fold(fold(input, key), toString(value)), typeof value);
	if (value === null) {
	return fold(hash, 'null');
	}
	if (value === undefined) {
	return fold(hash, 'undefined');
	}
	if (typeof value === 'object' \|\| typeof value === 'function') {
	if (seen.indexOf(value) !== -1) {
	return fold(hash, '[Circular]' + key);
	}
	seen.push(value);

	var objHash = foldObject(hash, value, seen)

	if (!('valueOf' in value) \|\| typeof value.valueOf !== 'function') {
	return objHash;
	}

	try {
	return fold(objHash, String(value.valueOf()))
	} catch (err) {
	return fold(objHash, '[valueOf exception]' + (err.stack \|\| err.message))
	}
	}
	return fold(hash, value.toString());
	}

	function toString (o) {
	return Object.prototype.toString.call(o);
	}

	function sum (o) {
	return pad(foldValue(0, o, '', []).toString(16), 8);
	}

	module.exports = sum;

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