Valip is a validation library for Clojure. It is primarily designed to validate keyword-string maps, such as one might get from a HTML form.
This is a fork of Chas Emerick's valip library which, in turn, was a fork of James Reeves's valip library.
It come from following the step by step instruction on Mimmo Cosenza's tutorial on migration of CLJ/CLJS portable libraries to use CLJ/CLJS Reader Conditional extension. I'm using this fork to learn CLJ/CLJS and experience some of the activities around open source contribution.
Add the following dependency to your project.clj file or to your build.boot file:
[org.clojars.saicheong/valip "0.4.0-SNAPSHOT"]
The main validation function is valip.core/validate. It uses the following
syntax:
(validate map-of-values
[key1 predicate1 error1]
[key2 predicate2 error2]
...
[keyn predicaten errorn])
For each vector, the key is used to look up a value in the map. The map value
is then tested with the predicate function. If the predicate fails, the error
message is included in the map of errors returned by the validate function. A
key may be tested multiple times with different predicates and errors.
If no predicate fails, nil is returned. If at least one predicate fails, a
map of keys to errors is returned:
{key1 [error1]
key2 [error2]
...
keyn [errorn]}
The errors are listed in a vector, because there may be multiple errors for the same key.
For example:
(use 'valip.core 'valip.predicates)
(def user
{:name "Alice", :age 7})
(validate user
[:name present? "must be present"]
[:age present? "must be present"]
[:age (over 18) "must be over 18"])
=> {:age ["must be over 18"])
You can see an example of usage of the valip library in a sample Hoplon input form here.
Valip has a number of useful predicates and functions that generate predicates. More of these useful predicates will be added as the library matures.
You can find portable predicates in the valip.predicates namespace.
Platform-specifc predicates can be found in valip.java.predicates and
valip.js.predicates, depending on your deployment target.
Copyright © 2012-2017 James Reeves and Chas Emerick
Distributed under the Eclipse Public License, the same as Clojure.