Class: PictureTag::Instructions::Instruction

Inherits:

Object

• Object
• PictureTag::Instructions::Instruction

Defined in:

lib/jekyll_picture_tag/instructions.rb

Overview

Generic instruction, meant to be inherited. Children of this class must override the source method, and likely want to override valid?, coerce, and error_message as applicable.

Direct Known Subclasses

Backend, Baseurl, CdnUrl, ConditionalInstruction, Config, DestDir, EnvInstruction, FallbackFormat, FallbackWidth, Formats, HtmlAttributes, JekyllEnv, MediaPresets, Nomarkdown, OutputClass, Page, Params, Pconfig, Preset, Site, SourceDir, SourceImages

Instance Method Summary

• #value ⇒ Object

  Memoized value of the given instruction.

Instance Method Details

#value ⇒ Object

Memoized value of the given instruction. This is the public API.

Raises:

• (ArgumentError)

# File 'lib/jekyll_picture_tag/instructions.rb', line 18

def value
  return @value if defined?(@value)

  raise ArgumentError, error_message unless valid?

  @value = coerced
end