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Contents
# Raised when an object fails a validation test.
class ValidationError < RuntimeError; end
class Object
# Returns whether this object is nil, false, empty, or a whitespace string.
# For example, "", " ", +nil+, [], and {} are blank.
#
# This method is borrowed from Rails ActiveSupport.
def blank?
respond_to?(:empty?) ? empty? : !self
end
# Returns whether this object is nil, empty, or a whitespace string.
# For example, "", " ", +nil+, [], and {} return +true+.
#
# This method differs from blank? in that +false+ is an allowed value.
def nil_or_empty?
nil? or (respond_to?(:empty?) and empty?)
end
end
module Validation
# A Validator is a procedure which responds to the +validate(value)+ method.
class Validator < Proc
alias :validate :call
end
# Validates that each key value in the value_type_assns value => type hash is an instance of the associated class.
#
# Raises ValidationError if the value is missing.
# Raises TypeError if the value is not the specified type.
def validate_type(value_type_assns)
TYPE_VALIDATOR.validate(value_type_assns)
end
private
def self.create_type_validator
Validator.new do |value_type_assns|
value_type_assns.each do |value, type|
raise ArgumentError.new("Missing #{type.name} argument") if value.nil?
raise TypeError.new("Unsupported argument type; expected: #{type.name} found: #{value.class.name}") unless type === value
end
end
end
TYPE_VALIDATOR = create_type_validator
end
Version data entries
7 entries across 7 versions & 1 rubygems