raven-validate

Field validation that collects every problem instead of stopping at the first. You make a Validator, run your checks against it, then ask whether it passed. No dependencies.

Install

[dependencies]
"github.com/martian56/raven-validate" = "v0.1.0"

Usage

import "github.com/martian56/raven-validate" { Validator }

fun check_signup(name: String, email: String, age: Int) -> Bool {
    let v = Validator.new()
    v.required("name", name)
    v.min_len("name", name, 2)
    v.email("email", email)
    v.in_range("age", age, 13, 120)

    if v.is_valid() {
        return true
    }
    // v.errors() is a list of readable messages to show the user
    return false
}

The rule methods also return the validator, so chaining works if you'd rather write it that way:

let v = Validator.new().required("name", name).email("email", email)

Rules

Method	Passes when
required(field, value)	value isn't empty
min_len(field, value, n)	value is at least n characters
max_len(field, value, n)	value is at most n characters
email(field, value)	value has the shape of an email
one_of(field, value, options)	value is in options
in_range(field, value, lo, hi)	the Int value is within [lo, hi]
check(ok, message)	ok is true (for a rule of your own)

The field name goes into the message, so you get things like name is required or age must be between 13 and 120.

Reading the result

is_valid() is the quick yes or no. errors() is the full list of messages, and first_error() is the first one as an Option<String>.

License

MIT