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module Ox
# An Object that includes the HasAttrs module can have attributes which are a Hash of String values and either String
# or Symbol keys.
#
# To access the attributes there are several options. One is to walk the attributes. The easiest for simple regularly
# formatted XML is to reference the attributes simply by name.
module HasAttrs
# Returns all the attributes of the Instruct as a Hash.
# *return* [Hash] all attributes and attribute values.
def attributes
@attributes = { } if !instance_variable_defined?(:@attributes) or @attributes.nil?
@attributes
end
# Returns the value of an attribute.
# - +attr+ [Symbol|String] attribute name or key to return the value for
def [](attr)
return nil unless instance_variable_defined?(:@attributes) and @attributes.is_a?(Hash)
@attributes[attr] or (attr.is_a?(String) ? @attributes[attr.to_sym] : @attributes[attr.to_s])
end
# Adds or set an attribute of the Instruct.
# - +attr+ [Symbol|String] attribute name or key
# - +value+ [Object] value for the attribute
def []=(attr, value)
raise "argument to [] must be a Symbol or a String." unless attr.is_a?(Symbol) or attr.is_a?(String)
@attributes = { } if !instance_variable_defined?(:@attributes) or @attributes.nil?
@attributes[attr] = value.to_s
end
# Handles the 'easy' API that allows navigating a simple XML by
# referencing attributes by name.
# - +id+ [Symbol] element or attribute name
# *return* [String|nil] the attribute value
# _raise_ [NoMethodError] if no match is found
def method_missing(id, *args, &block)
ids = id.to_s
if instance_variable_defined?(:@attributes)
return @attributes[id] if @attributes.has_key?(id)
return @attributes[ids] if @attributes.has_key?(ids)
end
raise NoMethodError.new("#{ids} not found", name)
end
end # HasAttrs
end # Ox
Version data entries
41 entries across 41 versions & 2 rubygems