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|
# frozen_string_literal: true
require_relative "helpers/file"
module Byebug
#
# Represents a frame in the stack trace
#
class Frame
include Helpers::FileHelper
attr_reader :pos
def initialize(context, pos)
@context = context
@pos = pos
end
def file
@context.frame_file(pos)
end
def line
@context.frame_line(pos)
end
def _self
@context.frame_self(pos)
end
def _binding
@context.frame_binding(pos)
end
def _class
@context.frame_class(pos)
end
def _method
@context.frame_method(pos)
end
def current?
@context.frame.pos == pos
end
#
# Gets local variables for the frame.
#
def locals
return [] unless _binding
_binding.local_variables.each_with_object({}) do |e, a|
a[e] = _binding.local_variable_get(e)
a
end
end
#
# Gets current method arguments for the frame.
#
def args
return c_args unless _binding
ruby_args
end
#
# Returns the current class in the frame or an empty string if the current
# +callstyle+ setting is 'short'
#
def deco_class
Setting[:callstyle] == "short" || _class.to_s.empty? ? "" : "#{_class}."
end
def deco_block
_method[/(?:block(?: \(\d+ levels\))?|rescue) in /] || ""
end
def deco_method
_method[/((?:block(?: \(\d+ levels\))?|rescue) in )?(.*)/]
end
#
# Builds a string containing all available args in the frame number, in a
# verbose or non verbose way according to the value of the +callstyle+
# setting
#
def deco_args
return "" if args.empty?
my_args = args.map do |arg|
prefix, default = prefix_and_default(arg[0])
kls = use_short_style?(arg) ? "" : "##{locals[arg[1]].class}"
"#{prefix}#{arg[1] || default}#{kls}"
end
"(#{my_args.join(', ')})"
end
#
# Builds a formatted string containing information about current method call
#
def deco_call
deco_block + deco_class + deco_method + deco_args
end
#
# Formatted filename in frame
#
def deco_file
Setting[:fullpath] ? File.expand_path(file) : shortpath(file)
end
#
# Properly formatted frame number of frame
#
def deco_pos
format("%-2<pos>d", pos: pos)
end
#
# Formatted mark for the frame.
#
# --> marks the current frame
# ͱ-- marks c-frames
# marks regular frames
#
def mark
return "-->" if current?
return " ͱ--" if c_frame?
" "
end
#
# Checks whether the frame is a c-frame
#
def c_frame?
_binding.nil?
end
def to_hash
{
mark: mark,
pos: deco_pos,
call: deco_call,
file: deco_file,
line: line,
full_path: File.expand_path(deco_file)
}
end
private
def c_args
return [] unless _self.to_s != "main"
_class.instance_method(_method).parameters
end
def ruby_args
meth_name = _binding.eval("__method__")
return [] unless meth_name
meth_obj = _class.instance_method(meth_name)
return [] unless meth_obj
meth_obj.parameters
end
def use_short_style?(arg)
Setting[:callstyle] == "short" || arg[1].nil? || locals.empty?
end
def prefix_and_default(arg_type)
return ["&", "block"] if arg_type == :block
return ["*", "args"] if arg_type == :rest
["", nil]
end
end
end
|
