class Xpect::Pred

Attributes

default[R]

Public Class Methods

new(pred:, error_msg: nil, default: nil) click to toggle source
# File lib/xpect/pred.rb, line 7
def initialize(pred:, error_msg: nil, default: nil)
  unless pred.is_a?(Proc)
    raise "pred must be a Proc"
  end

  @pred = pred
  @error_msg = error_msg
  @default = default
end

Public Instance Methods

conform!(value:, path: nil) click to toggle source
# File lib/xpect/pred.rb, line 17
def conform!(value:, path: nil)
  return @default if @default && value.nil?

  if value.nil?
    raise FailedSpec, "the value at path '#{ path }' is missing"
  end

  unless @pred.call(value)
    error_msg = if @error_msg
                  "'#{ value }' does not meet spec for '#{ path }': '#{ @error_msg }'"
                else
                  "'#{ value }' does not meet spec for '#{ path }'"
                end

    raise FailedSpec, error_msg
  end

  value
end