Getting Started
Install Pudu 0.1.2 or later, then create a project and add the validator:
pudu init my-app
cd my-app
pudu install @chrismichaelps/pudu-lang-validator@0.1.1A validator is a value built from rules. Each rule names a property, selects it with a function, and checks it:
module Ex01First
import Std.Io as Io
import PuduLangValidator as PuduLangValidator
import PuduLangValidator.Rule as Rule
import PuduLangValidator.Rules.Number as NumberRule
import PuduLangValidator.Rules.Text as TextRule
import PuduLangValidator.Validator as Validator
type Customer = { name: Str, age: Int }
fn customerValidator() -> Validator.Validator[Customer] {
let name = Rule.build(TextRule.notEmpty(Rule.ruleFor("name", |customer: Customer| customer.name)))
let age = Rule.build(NumberRule.greaterThanOrEqualTo(Rule.ruleFor("age", |customer: Customer| customer.age), 18))
Validator.add(Validator.add(Validator.create(), name), age)
}
export fn main() -> Int {
let outcome = Validator.validate(&customerValidator(), Customer{name: "", age: 16})
let line = "package: " + PuduLangValidator.version()
+ ", valid: " + show(outcome.isValid) + ", failures: " + show(outcome.errors.length())
match Io.writeLine(line) {
case Ok(_) => if PuduLangValidator.version() == "0.1.1"
&& !outcome.isValid && outcome.errors.length() == 2 { 0 } else { 2 }
case Err(_) => 1
}
}
Check it and run it:
pudu check src/Ex01First.pudu
pudu run src/Ex01First.puduOutput:
package: 0.1.1, valid: false, failures: 2
Validator.validate returns a result, never an exception. isValid tells whether anything failed; errors holds one entry per failed check, in the order the rules were added. An exported main returning Int sets the process exit status.