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{% if e.is_flat() %}
class {{ e.name()|class_name_rb }}
{% for variant in e.variants() -%}
{{ variant.name()|enum_name_rb }} = {{ loop.index }}
{% endfor %}
end
{% else %}
class {{ e.name()|class_name_rb }}
def initialize
raise RuntimeError, '{{ e.name()|class_name_rb }} cannot be instantiated directly'
end
# Each enum variant is a nested class of the enum itself.
{% for variant in e.variants() -%}
class {{ variant.name()|enum_name_rb }}
{% if variant.has_fields() %}
attr_reader {% for field in variant.fields() %}:{{ field.name()|var_name_rb }}{% if loop.last %}{% else %}, {% endif %}{%- endfor %}
{% endif %}
def initialize({% for field in variant.fields() %}{{ field.name()|var_name_rb }}{% if loop.last %}{% else %}, {% endif %}{% endfor %})
{% if variant.has_fields() %}
{%- for field in variant.fields() %}
@{{ field.name()|var_name_rb }} = {{ field.name()|var_name_rb }}
{%- endfor %}
{% else %}
{% endif %}
end
def to_s
"{{ e.name()|class_name_rb }}::{{ variant.name()|enum_name_rb }}({% for field in variant.fields() %}{{ field.name() }}=#{@{{ field.name() }}}{% if loop.last %}{% else %}, {% endif %}{% endfor %})"
end
def ==(other)
if !other.{{ variant.name()|var_name_rb }}?
return false
end
{%- for field in variant.fields() %}
if @{{ field.name()|var_name_rb }} != other.{{ field.name()|var_name_rb }}
return false
end
{%- endfor %}
true
end
# For each variant, we have an `NAME?` method for easily checking
# whether an instance is that variant.
{% for variant in e.variants() %}
def {{ variant.name()|var_name_rb }}?
instance_of? {{ e.name()|class_name_rb }}::{{ variant.name()|enum_name_rb }}
end
{% endfor %}
end
{% endfor %}
end
{% endif %}