Module: Common

Defined in:
lib/debugtrace/common.rb

Overview

　Defines commonly used functions.

Class Method Summary collapse

Class Method Details

.check_type(value_name, value, type) ⇒ String

Check the value types.

Parameters:

  • value_name (String) —

    the value name

  • value (String) —

    the value

  • type (Class) —

    the type

Returns:

  • (String) —

    the value

Raises:

  • (TypeError) —

    if the value is not an instance of the type or the subclass of the type



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# File 'lib/debugtrace/common.rb', line 14

def self.check_type(value_name, value, type)
  raise TypeError, "Argument value_name (=#{value_name}) must be a String" unless value_name.is_a?(String)
  raise TypeError, "Argument type (=#{type}) must be a Class" unless type.is_a?(Class)

  error = false
  if type == FalseClass || type == TrueClass
    # false or true
    if value.class != FalseClass && value.class != TrueClass
      error = true
    end
  else
    error = !value.is_a?(type)
  end

  if error
    value_string = value.instance_of?(String) ? "\"#{value}\"" : "#{value}"
    top_type_name = type.name.slice(0).upcase
    a = top_type_name == 'A' || top_type_name == 'I' || top_type_name == 'U' ||
      top_type_name == 'E' || top_type_name == 'O' ? 'an' : 'a'
    raise TypeError, "Argument #{value_name} (=#{value_string}) must be #{a} #{type}"
  end
  return value
end