Valua - Validation for Lua

A module for making chained validations. Create your objects, append your tests, use and reuse it!

Originally bundled with Sailor MVC Web Framework, now released as a separated module. https://github.com/Etiene/sailor

This module provides tools for validating values, very useful in forms, but also usable elsewhere. It works in appended chains. Create a new validation object and start chaining your test functions. If your value fails a test, it breaks the chain and does not evaluate the rest of it. It returns a boolean and an error string (nil when tests succeeded).

Valua is also available through luarocks

luarocks install valua

Usage

Example 1 - Just create, chain and use:

valua:new().type("string").len(3,5)("test string!") -- false, "should have 3-5 characters"

Example 2 - Create, chain and later use it multiple times:

local reusable_validation = valua:new().type("string").len(3,5)
reusable_validation("test string!") -- false, "should have 3-5 characters"
reusable_validation("test!") -- true

Current validation functions

• alnum() - Checks if string is alphanumeric.
• boolean() - Checks if value is a boolean.
• compare(another_value) - Checks if value is equal to another value.
• contains(substr) - Checks if a string contains a substring.
• date() or date(format) - Checks if a string is a valid date. Default format is UK (dd/mm/yyyy). Also checks for US and ISO formats.
• email() - Checks if a string is a valid email address.
• empty() - Checks if a value is empty.
• integer() - Checks if a number is an integer;
• in_list(list) - Checks if a value is inside an array.
• len(min,max) - Checks if a string's length is between min and max.
• match(pattern) - Checks if a string matches a given pattern.
• max(n) - Checks if a number is equal or less than n.
• min(n) - Checks if a number is equal or greater than n.
• not_empty() - Checks if a value is not empty.
• no_white() - Checks if a string contains no white spaces.
• number() - Checks if a value is a number.
• string() - Checks if a value is a string.
• type(t) - Checks if a value is of type t.
• optional(t) - If value is nil it would be accepted. If it's not nil it would be processed with other chained validation functions as usually done.

Copyright (c) 2014 Etiene Dalcol

http://etiene.net

http://twitter.com/etiene_d

License: MIT

Inspired by Respect Validation for PHP

https://github.com/Respect/Validation