class ArchSpec::Rules::MustImplementRule

# File lib/archspec/rules/protocol_rules.rb, line 89
def initialize(source, method_name, scope: :instance, arity: nil, keywords: nil)
  ProtocolEvidence.validate_scope!(scope, for_rule: 'must_implement')
  if arity && (!arity.is_a?(Integer) || arity.negative?)
    raise Error, "must_implement arity: must be a non-negative Integer, got #{arity.inspect}"
  end

  @source = source.to_sym
  @method_name = method_name.to_sym
  @scope = scope
  @arity = arity
  @keywords = Array(keywords).compact.map(&:to_sym).to_set
end

# File lib/archspec/rules/protocol_rules.rb, line 110
def evaluate(graph)
  constants_for(graph).filter_map do |constant|
    definitions, unresolved = graph.effective_method_definitions(constant.name, scope)
    implementations = definitions.select { |definition| definition.name == method_name }
    next if requirement_met?(implementations)

    Diagnostic.new(
      rule: id,
      message: "#{constant.name} must implement #{method_label}#{requirement_clause}",
      location: constant.location,
      evidence: evidence_for(constant, definitions, implementations, unresolved),
      confidence: unresolved.empty? && signature_known?(implementations) ? :high : :medium
    )
  end
end

# File lib/archspec/rules/protocol_rules.rb, line 106
def id
  'protocol.must_implement'
end

# File lib/archspec/rules/protocol_rules.rb, line 102
def merge_key
  [self.class, source, method_name, scope, arity, keywords]
end