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##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)
####Usage
Example 1 - Just create, chain and use:
```lua
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:
```lua
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 alfanumeric.
* boolean() -
Checks if value is a boolean.
* compare(another_value) -
Checks if value is equal to another value.
* contains(substr) -
Check 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.
Copyright (c) 2014 Etiene Dalcol
http://etiene.net
License: MIT
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