module Vernier::StackTableHelpers

def backtrace(stack_idx)
  full_stack(stack_idx).map do |stack_idx|
    frame_idx = stack_frame_idx(stack_idx)
    func_idx = frame_func_idx(frame_idx)
    line = frame_line_no(frame_idx)
    name = func_name(func_idx);
    filename = func_filename(func_idx);
    "#{filename}:#{line}:in '#{name}'"
  end
end

def full_stack(stack_idx)
  full_stack = []
  while stack_idx
    full_stack << stack_idx
    stack_idx = stack_parent_idx(stack_idx)
  end
  full_stack
end

def inspect
  "#<#{self.class.name} #{stack_count} stacks, #{frame_count} frames, #{func_count} funcs>"
end

def stack(idx)
  Stack.new(self, idx)
end

def to_h
  {
    stack_table: {
      parent: stack_count.times.map { stack_parent_idx(_1) },
      frame:  stack_count.times.map { stack_frame_idx(_1) }
    },
    frame_table: {
      func: frame_count.times.map { frame_func_idx(_1) },
      line:  frame_count.times.map { frame_line_no(_1) }
    },
    func_table: {
      name: func_count.times.map { func_name(_1) },
      filename: func_count.times.map { func_filename(_1) },
      first_line: func_count.times.map { func_first_lineno(_1) }
    }
  }
end