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lib/predicate/max_length.ex
defmodule Funx.Predicate.MaxLength do
@moduledoc """
Predicate that checks if a string does not exceed a maximum length.
Options
- `:max` (required)
Maximum length (integer).
## Examples
use Funx.Predicate
# Check if name is at most 100 characters
pred do
check :name, {MaxLength, max: 100}
end
# Combined with other predicates
pred do
check :password, {MinLength, min: 8}
check :password, {MaxLength, max: 128}
end
"""
@behaviour Funx.Predicate.Dsl.Behaviour
@impl true
def pred(opts) do
max = Keyword.fetch!(opts, :max)
fn
string when is_binary(string) -> String.length(string) <= max
_non_string -> false
end
end
end