class Clamp::Attribute::Instance
Represents an attribute of a Clamp::Command
instance.
Attributes
Public Class Methods
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# File lib/clamp/attribute/instance.rb, line 10 def initialize(attribute, command) @attribute = attribute @command = command end
Public Instance Methods
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# File lib/clamp/attribute/instance.rb, line 42 def _append(value) current_values = get || [] set(current_values + [value]) end
default implementation of append_method
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# File lib/clamp/attribute/instance.rb, line 36 def _read set(default) unless self.defined? get end
default implementation of read_method
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# File lib/clamp/attribute/instance.rb, line 48 def _replace(values) set([]) Array(values).each { |value| take(value) } end
default implementation of write_method for multi-valued attributes
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# File lib/clamp/attribute/instance.rb, line 31 def default command.send(attribute.default_method) if command.respond_to?(attribute.default_method, true) end
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# File lib/clamp/attribute/instance.rb, line 69 def default_from_environment return if self.defined? return if attribute.environment_variable.nil? return unless ENV.key?(attribute.environment_variable) # Set the parameter value if it's environment variable is present value = ENV[attribute.environment_variable] begin take(value) rescue ArgumentError => e signal_usage_error Clamp.message(:env_argument_error, env: attribute.environment_variable, message: e.message) end end
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# File lib/clamp/attribute/instance.rb, line 17 def defined? command.instance_variable_defined?(attribute.ivar_name) end
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# File lib/clamp/attribute/instance.rb, line 22 def get command.instance_variable_get(attribute.ivar_name) end
get value directly
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# File lib/clamp/attribute/instance.rb, line 90 def missing? attribute.required? && unset? end
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# File lib/clamp/attribute/instance.rb, line 53 def read command.send(attribute.read_method) end
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# File lib/clamp/attribute/instance.rb, line 27 def set(value) command.instance_variable_set(attribute.ivar_name, value) end
set value directly
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# File lib/clamp/attribute/instance.rb, line 65 def signal_usage_error(*args) command.send(:signal_usage_error, *args) end
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# File lib/clamp/attribute/instance.rb, line 57 def take(value) if attribute.multivalued? command.send(attribute.append_method, value) else command.send(attribute.write_method, value) end end
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# File lib/clamp/attribute/instance.rb, line 82 def unset? if attribute.multivalued? read.empty? else read.nil? end end
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# File lib/clamp/attribute/instance.rb, line 94 def verify_not_missing signal_usage_error attribute.option_missing_message if missing? end