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Viewing file:     hash-sum.js (1.21 KB)      -rw-r--r--

'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') {
    if (seen.indexOf(value) !== -1) {
      return fold(hash, '[Circular]' + key);
    }
    seen.push(value);
    return foldObject(hash, value, seen);
  }
  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;