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/**
 * negotiator
 * Copyright(c) 2012 Isaac Z. Schlueter
 * Copyright(c) 2014 Federico Romero
 * Copyright(c) 2014-2015 Douglas Christopher Wilson
 * MIT Licensed
 */

'use strict';

/**
 * Module exports.
 * @public
 */

module.exports = preferredLanguages;
module.exports.preferredLanguages = preferredLanguages;

/**
 * Module variables.
 * @private
 */

var simpleLanguageRegExp = /^\s*([^\s\-;]+)(?:-([^\s;]+))?\s*(?:;(.*))?$/;

/**
 * Parse the Accept-Language header.
 * @private
 */

function parseAcceptLanguage(accept) {
  var accepts = accept.split(',');

for (var i = 0, j = 0; i < accepts.length; i++) {
    var language = parseLanguage(accepts[i].trim(), i);

if (language) {
      accepts[j++] = language;
    }
  }

// trim accepts
  accepts.length = j;

return accepts;
}

/**
 * Parse a language from the Accept-Language header.
 * @private
 */

function parseLanguage(str, i) {
  var match = simpleLanguageRegExp.exec(str);
  if (!match) return null;

var prefix = match[1]
  var suffix = match[2]
  var full = prefix

if (suffix) full += "-" + suffix;

var q = 1;
  if (match[3]) {
    var params = match[3].split(';')
    for (var j = 0; j < params.length; j++) {
      var p = params[j].split('=');
      if (p[0] === 'q') q = parseFloat(p[1]);
    }
  }

return {
    prefix: prefix,
    suffix: suffix,
    q: q,
    i: i,
    full: full
  };
}

/**
 * Get the priority of a language.
 * @private
 */

function getLanguagePriority(language, accepted, index) {
  var priority = {o: -1, q: 0, s: 0};

for (var i = 0; i < accepted.length; i++) {
    var spec = specify(language, accepted[i], index);

if (spec && (priority.s - spec.s || priority.q - spec.q || priority.o - spec.o) < 0) {
      priority = spec;
    }
  }

return priority;
}

/**
 * Get the specificity of the language.
 * @private
 */

return {
    i: index,
    o: spec.i,
    q: spec.q,
    s: s
  }
};

/**
 * Get the preferred languages from an Accept-Language header.
 * @public
 */

function preferredLanguages(accept, provided) {
  // RFC 2616 sec 14.4: no header = *
  var accepts = parseAcceptLanguage(accept === undefined ? '*' : accept || '');

if (!provided) {
    // sorted list of all languages
    return accepts
      .filter(isQuality)
      .sort(compareSpecs)
      .map(getFullLanguage);
  }

var priorities = provided.map(function getPriority(type, index) {
    return getLanguagePriority(type, accepts, index);
  });

// sorted list of accepted languages
  return priorities.filter(isQuality).sort(compareSpecs).map(function getLanguage(priority) {
    return provided[priorities.indexOf(priority)];
  });
}

/**
 * Compare two specs.
 * @private
 */

function compareSpecs(a, b) {
  return (b.q - a.q) || (b.s - a.s) || (a.o - b.o) || (a.i - b.i) || 0;
}

/**
 * Get full language string.
 * @private
 */

function getFullLanguage(spec) {
  return spec.full;
}

/**
 * Check if a spec has any quality.
 * @private
 */

function isQuality(spec) {
  return spec.q > 0;
}

Batal

⬅ negotiator 4 item

Nama	Tipe	Ukuran	Diubah	Perm	Aksi
📜 charset.js	js	3 KB	17/03/26 16:19	0644	✏️ ⬇
📜 encoding.js	js	3.4 KB	17/03/26 16:19	0644	✏️ ⬇
📜 language.js	js	3.3 KB	17/03/26 16:19	0644	✏️ ⬇
📜 mediaType.js	js	5.2 KB	17/03/26 16:19	0644	✏️ ⬇

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