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# frozen_string_literal: true
module Byebug
module Helpers
#
# Utilities to assist frame navigation
#
module FrameHelper
def switch_to_frame(frame)
new_frame = index_from_start(frame)
return frame_err("c_frame") if Frame.new(context, new_frame).c_frame?
adjust_frame(new_frame)
end
def jump_frames(steps)
adjust_frame(navigate_to_frame(steps))
end
private
def adjust_frame(new_frame)
return frame_err("too_low") if new_frame >= context.stack_size
return frame_err("too_high") if new_frame.negative?
context.frame = new_frame
processor.prev_line = nil
end
def navigate_to_frame(jump_no)
current_jumps = 0
current_pos = context.frame.pos
loop do
current_pos += direction(jump_no)
break if out_of_bounds?(current_pos)
next if Frame.new(context, current_pos).c_frame?
current_jumps += 1
break if current_jumps == jump_no.abs
end
current_pos
end
def out_of_bounds?(pos)
!(0...context.stack_size).cover?(pos)
end
def frame_err(msg)
errmsg(pr("frame.errors.#{msg}"))
end
#
# @param step [Integer] A positive or negative integer
#
# @return [Integer] +1 if step is positive / -1 if negative
#
def direction(step)
step / step.abs
end
#
# Convert a possibly negative index to a positive index from the start
# of the callstack. -1 is the last position in the stack and so on.
#
# @param i [Integer] Integer to be converted in a proper positive index.
#
def index_from_start(index)
index >= 0 ? index : context.stack_size + index
end
end
end
end
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