module TensorStream::StringHelper

helper string methods usually found in ActiveSupport but need to replicate here since we don't want to use ActiveSupport

Public Instance Methods

camelize(string, uppercase_first_letter = true) click to toggle source
# File lib/tensor_stream/helpers/string_helper.rb, line 5
def camelize(string, uppercase_first_letter = true)
  string = if uppercase_first_letter
    string.sub(/^[a-z\d]*/) { $&.capitalize }
  else
    string.sub(/^(?:(?=\b|[A-Z_])|\w)/) { $&.downcase }
  end
  string.gsub(/(?:_|(\/))([a-z\d]*)/) { "#{$1}#{$2.capitalize}" }.gsub("/", "::")
end
constantize(camel_cased_word) click to toggle source
# File lib/tensor_stream/helpers/string_helper.rb, line 27
def constantize(camel_cased_word)
  names = camel_cased_word.split("::")

  # Trigger a built-in NameError exception including the ill-formed constant in the message.
  Object.const_get(camel_cased_word) if names.empty?

  # Remove the first blank element in case of '::ClassName' notation.
  names.shift if names.size > 1 && names.first.empty?

  names.inject(Object) do |constant, name|
    if constant == Object
      constant.const_get(name)
    else
      candidate = constant.const_get(name)
      next candidate if constant.const_defined?(name, false)
      next candidate unless Object.const_defined?(name)

      # Go down the ancestors to check if it is owned directly. The check
      # stops when we reach Object or the end of ancestors tree.
      constant = constant.ancestors.inject { |const, ancestor|
        break const    if ancestor == Object
        break ancestor if ancestor.const_defined?(name, false)
        const
      }

      # owner is in Object, so raise
      constant.const_get(name, false)
    end
  end
end
symbolize_keys(hash) click to toggle source
# File lib/tensor_stream/helpers/string_helper.rb, line 21
def symbolize_keys(hash)
  hash.map { |k, v|
    [k.to_sym, v]
  }.to_h
end
underscore(string) click to toggle source
# File lib/tensor_stream/helpers/string_helper.rb, line 14
def underscore(string)
  string.gsub(/::/, "/").
    gsub(/([A-Z]+)([A-Z][a-z])/, '\1_\2').
    gsub(/([a-z\d])([A-Z])/, '\1_\2').
    tr("-", "_").downcase
end