Sha256: 6126a56b7c7acf7c6f73cc7653ccd6f09025f5dd806876575d0db1771f8d763a
Contents?: true
Size: 1.6 KB
Versions: 9
Compression:
Stored size: 1.6 KB
Contents
module PictureTag
module Instructions
# Many inputs take a common format: a generic setting which applies all of
# the time, or more specific versions of that setting for specific
# circumstances. For example, quality can be set globally, or per image
# format. This instruction class handles those cases.
#
# To use, you must at minimum define setting_basename, setting_prefix, and
# add to the acceptable_types (or write your own validation).
class ConditionalInstruction < Instruction
def value(*args)
coerce(*args)
end
private
def setting_basename
raise NotImplementedError
end
# Special condition for setting; media, crop, etc
def setting_prefix
raise NotImplementedError
end
def acceptable_types
[NilClass]
end
def coerce(arg)
raise ArgumentError unless valid?
value_hash[arg]
end
def source
{
hash: PictureTag.preset[setting_prefix + '_' + setting_name],
default: PictureTag.preset[setting_name]
}
end
def value_hash
vals = source[:hash] || {}
vals.default = source[:default]
vals
end
def valid?
valid_hash? && valid_default?
end
def acceptable_type?(value)
acceptable_types.any? { |type| value.is_a? type }
end
def valid_hash?
source[:hash].nil? || source[:hash].values.all? do |v|
acceptable_type?(v)
end
end
def valid_default?
acceptable_type? source[:default]
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems