Class: Glimmer::DSL::WidgetListenerExpression

Inherits:
Expression
  • Object
show all
Defined in:
lib/glimmer/dsl/widget_listener_expression.rb

Instance Method Summary collapse

Methods inherited from Expression

#add_content, #textual?, #widget?

Instance Method Details

#can_interpret?(parent, keyword, *args, &block) ⇒ Boolean

Returns:

  • (Boolean)

Raises:



8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
 
# File 'lib/glimmer/dsl/widget_listener_expression.rb', line 8

def can_interpret?(parent, keyword, *args, &block)
  Glimmer.logger&.debug "keyword starts with on_: #{keyword.start_with?('on_')}"
  return false unless keyword.start_with?('on_')
  widget_parentage = widget?(parent)
  Glimmer.logger&.debug "parent is a widget: #{widget_parentage}"
  return false unless widget_parentage
  Glimmer.logger&.debug "block exists?: #{!block.nil?}"
  raise Glimmer::Error, "Listener is missing block for keyword: #{keyword}" unless block_given?
  Glimmer.logger&.debug "args are empty?: #{args.empty?}"
  raise Glimmer::Error, "Invalid listener arguments for keyword: #{keyword}(#{args})" unless args.empty?
  result = parent.can_handle_observation_request?(keyword)
  Glimmer.logger&.debug "can add listener? #{result}"
  raise Glimmer::Error, "Invalid listener keyword: #{keyword}" unless result
  true
end

#interpret(parent, keyword, *args, &block) ⇒ Object 



24
25
26
 
# File 'lib/glimmer/dsl/widget_listener_expression.rb', line 24

def interpret(parent, keyword, *args, &block)
  parent.handle_observation_request(keyword, &block)
end