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What is lasca good for? Lasca will not solve all your problems. However, lasca is very logical and despises disorder. Lasca solves the following issues.

  • String.localeCompare results vary between platform and browser combinations. Lasca normalizes locale based sorting by using its own local copies of the UCA collation tables or developer defined collation tables.
  • Sorting results often differ between the front-end and the back-end because they use different collation tables. Lasca can use any collation table and/or sorting algorithm you provide. Lasca will also run in Node.js, so you can share collation tables between the front-end and back-end.

Development Status

The current version of lasca should be considered a beta release. Lasca is in need of testing by developers who fluently read and write other languages than English - unfortunately the primary author of Lasca only speaks English, JavaScript, and conversational Klingon. Please fork and fix Lasca as needed. Please file issues and take responsibility for other issues. Lasca loves self improvement and will be eternally grateful for your help.

Features

  • Sorts arrays, arrays of objects, and compare strings
  • Define custom sorting functions
  • Define custom functions for sorting characters not in a collation table
  • Runs in the browser or Node.js
  • AMD compliant and exportable – attempts to use define() or module.exports (node.js); if those efforts fail then lasca attaches to global root
  • Useful for automated internationalized testing in browsers
  • Available without UCA collation definitions (lasca.nouca.min.js 3.33KB as opposed to 105KB for lasca.min.js)

API

lasca.setLanguage(language)

Set the language collation table. If not set lasca will default to the first language in the collation table collection.

  • language (string or object) – collation table key or custom collation table definition
lasca.setLanguage('uca_devanagari');

lasca.setNonCollValCompare(func)

Set the comparator for values not defined in a collation table. The default functionality is to compare character code values.

  • func (function) – a comparator that accepts an "a" and "b" values
lasca.setNonCollValCompare(function (a, b) { return a > b ? 1 : -1; });

lasca.sort(array, [key])

Sort an array of values or an array of objects using a property key of the object.

  • array (array) – an array of values or objects to be sorted
  • key (optional, string) – a property key for an object
lasca.sort(['foo', 'bar', 'baz']); // sort an array
lasca.sort([{prop1: 1, prop2: 'foo'}, {prop1: 2, prop2: 'bar'}, {prop1: 3, prop2: 'baz'}], 'prop2'); // sort an array of objects

lasca.compare(a, b)

Compare two strings.

  • a (string) – first string to compare
  • b (string) – second string to compare
lasca.compare('foo', 'bar'); // returns -1
lasca.compare('bar', 'foo'); // returns 1
lasca.compare('foo', 'foo'); // returns 0

lasca.getLanguageKeys()

Returns the lookup keys for all defined collation tables.

lasca.getLanguage(key)

Returns a collation table and associated configuration for a language.

Defining Custom Collation Tables

Collation table definitions are object literals with the properties below. These definitions can be added to lasca by passing them to lasca.setLanguage().

  • key – A unique lookup key for the collation
  • collation – The encoded collation definition. Encodings are the hexadecimal values for the corresponding code point. If a character is comprised of more than one code point a '+' operator is used to signify that the code points should be considered a single character. This differs from the standard JavaScript character definition, which is a single 16 bit code point.
  • compare – Sets the sorting type. 'multi' is for languages that can have more than one code point per character. 'single' is for languages that only have one 16 bit code point per character.
  • More information on collation tables can be found at http://www.collation-charts.org/

Examples

// single code point per character language
{ key : 'uca_avestan', collation : '10B0010B0110B0210B0310B0410B0510B0610B0710B0810B0910B0A10B0B10B0C10B0D10B0E10B0F10B1010B1110B1210B1310B1410B1510B1610B1710B1810B1910B1A10B1B10B1C10B1D10B1E10B1F10B2010B2110B2210B2310B2410B2510B2610B2710B2810B2910B2A10B2B10B2C10B2D10B2E10B2F10B3010B3110B3210B3310B3410B35', compare : 'single' };
// multiple code point character language
{ key : 'uca_balinese', collation : '1B051B05+1B351B061B071B07+1B351B081B091B09+1B351B0A1B0B1B0B+1B351B0C1B0D1B0D+1B351B0E1B0F1B101B111B11+1B351B121B131B451B461B141B151B161B171B181B191B1A1B1B1B1C1B1D1B1E1B1F1B201B211B221B471B231B241B251B261B271B481B281B291B2A1B2B1B2C1B2D1B2E1B2F1B491B301B311B321B4A1B4B1B331B351B361B371B381B391B3A1B3A+1B351B3B1B3C1B3C+1B351B3D1B3E1B3F1B3E+1B351B401B3F+1B351B411B421B42+1B351B431B44', compare : 'multi' };

License

Copyright © 2011-2012 by Teradata Corporation.

Issued under the MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.