Class: Predicates::HexColor

Inherits:
Pattern show all
Defined in:
lib/predicates/hex_color.rb

Overview

Defines a field as a hex color. These are hexadecimal strings from 3 to 6 characters long. All hex colors will be saved in the database with a preceding pound sign (e.g. #123456). Also, #123456 is actually a pretty cool color. You should try it.

Instance Attribute Summary

Attributes inherited from Base

#full_message, #or_empty, #validate_if, #validate_on

Instance Method Summary collapse

Methods inherited from Pattern

#validate

Methods inherited from Base

#allow_empty?, #error, #error_binds, #initialize, #to_human, #validate

Constructor Details

This class inherits a constructor from Predicates::Base

Instance Method Details

#error_message ⇒ Object 



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# File 'lib/predicates/hex_color.rb', line 8

def error_message
  @error_message ||= :hex
end

#like ⇒ Object

a fixed regexp



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# File 'lib/predicates/hex_color.rb', line 4

def like
  @like ||= /\A#[0-9a-fA-F]{6}\Z/
end

#normalize(value) ⇒ Object 



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# File 'lib/predicates/hex_color.rb', line 12

def normalize(value)
  return value if value.blank?

  # ensure leading pound sign
  value = "##{value}" unless value[0].chr == '#'
  # expand from three characters to six characters
  if value =~ /\A#[0-9a-fA-F]{3}\Z/
    value = "##{value[1].chr * 2}#{value[2].chr * 2}#{value[3].chr * 2}"
  end

  value
end