class Byebug::Context

def self.bin_file
  @bin_file ||= Gem.bin_path('byebug', 'byebug')
end

def self.ignored_files
  Byebug.mode == :standalone ? lib_files + [bin_file] : lib_files
end

def self.lib_files
  @lib_files ||= Dir.glob(File.expand_path('../../**/*.rb', __FILE__))
end

def at_breakpoint(brkpnt)
  handler.at_breakpoint(self, brkpnt)
end

def at_catchpoint(excpt)
  handler.at_catchpoint(self, excpt)
end

def at_line(file, line)
  handler.at_line(self, file, line) unless ignored_file?(file)
end

def at_return(file, line)
  handler.at_return(self, file, line) unless ignored_file?(file)
end

def at_tracing(file, line)
  handler.at_tracing(self, file, line) unless ignored_file?(file)
end

def c_frame_args(frame_no)
  myself = frame_self(frame_no)
  return [] unless myself.to_s != 'main'
  myself.method(frame_method(frame_no)).parameters
end

def frame_args(frame_no = 0)
  bind = frame_binding(frame_no)
  return c_frame_args(frame_no) unless bind
  ruby_frame_args(bind)
end

def frame_locals(frame_no = 0)
  bind = frame_binding(frame_no)
  return [] unless bind
  bind.eval('local_variables.inject({}){|h, v| h[v] = eval(v.to_s); h}')
end

def handler
  Byebug.handler || fail('No interface loaded')
end

def ignored_file?(path)
  self.class.ignored_files.include?(path)
end

def interrupt
  step_into 1
end

def ruby_frame_args(bind)
  return [] unless bind.eval('__method__')
  bind.eval('method(__method__).parameters')
rescue NameError => e
  Byebug.errmsg \
    "Exception #{e.class} (#{e.message}) while retreving frame params"
  []
end

def stack_size
  return 0 unless backtrace
  backtrace.drop_while { |l| ignored_file?(l.first.path) }
    .take_while { |l| !ignored_file?(l.first.path) }
    .size
end