Class: Rubycli::ConstantCapture

Inherits:
Object
  • Object
show all
Defined in:
lib/rubycli/constant_capture.rb

Overview

Observes constants defined while loading a file.

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ConstantCapture

Returns a new instance of ConstantCapture.



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# File 'lib/rubycli/constant_capture.rb', line 8

def initialize
  @captured = Hash.new { |hash, key| hash[key] = [] }
  @assignment_definitions = {}
end

Instance Method Details

#capture(file) ⇒ Object 



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# File 'lib/rubycli/constant_capture.rb', line 13

def capture(file)
  normalized_file = normalize(file)
  source = File.read(normalized_file)
  previous_names = @captured[normalized_file].dup
  previous_assignment_definitions = @assignment_definitions.fetch(normalized_file, {})
  executed_line_contexts = Hash.new { |hash, line| hash[line] = [] }
  assignment_events = Hash.new { |hash, line| hash[line] = [] }
  observed_events = []
  @captured[normalized_file] = []
  before_snapshot = constant_snapshot(normalized_file)
  trace = TracePoint.new(:class, :line, :call, :return, :b_call, :b_return, :c_call, :c_return) do |tp|
    location = tp.path
    next unless location && same_file?(normalized_file, location)

    observed_events << [tp.event, tp.self, tp.lineno, tp.method_id]
  end

  trace.enable
  yield
ensure
  trace&.disable
  if normalized_file && before_snapshot
    current_assignment_definitions = assigned_constant_definitions(source)
    apply_trace_events(
      observed_events,
      executed_line_contexts,
      assignment_events,
      normalized_file
    )
    after_snapshot = constant_snapshot(normalized_file)
    changed_names = after_snapshot.keys.select do |name|
      before_snapshot[name] != after_snapshot[name]
    end
    retained_names = previous_names.select do |name|
      previous_definitions = previous_assignment_definitions.fetch(name, [])
      current_definitions = current_assignment_definitions.fetch(name, [])
      definition_active = active_definition_retained?(
        previous_definitions,
        current_definitions,
        executed_line_contexts,
        assignment_events
      )
      after_snapshot.key?(name) && definition_active
    end
    @captured[normalized_file].concat(changed_names).concat(retained_names)
    @assignment_definitions[normalized_file] = current_assignment_definitions
  end
end

#constants_for(file) ⇒ Object 



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# File 'lib/rubycli/constant_capture.rb', line 62

def constants_for(file)
  Array(@captured[normalize(file)]).uniq
end