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# frozen_string_literal: true
require_relative "../command"
require_relative "../source_file_formatter"
require_relative "../helpers/file"
require_relative "../helpers/parse"
module Byebug
#
# List parts of the source code.
#
class ListCommand < Command
include Helpers::FileHelper
include Helpers::ParseHelper
self.allow_in_post_mortem = true
def self.regexp
/^\s* l(?:ist)? (?:\s*([-=])|\s+(\S+))? \s*$/x
end
def self.description
<<-DESCRIPTION
l[ist][[-=]][ nn-mm]
#{short_description}
Lists lines forward from current line or from the place where code was
last listed. If "list-" is specified, lists backwards instead. If
"list=" is specified, lists from current line regardless of where code
was last listed. A line range can also be specified to list specific
sections of code.
DESCRIPTION
end
def self.short_description
"Lists lines of source code"
end
def execute
msg = "No sourcefile available for #{frame.file}"
raise(msg) unless File.exist?(frame.file)
b, e = range(@match[2])
display_lines(b, e)
processor.prev_line = b
end
private
#
# Line range to be printed by `list`.
#
# If <input> is set, range is parsed from it.
#
# Otherwise it's automatically chosen.
#
def range(input)
return auto_range(@match[1] || "+") unless input
b, e = parse_range(input)
raise("Invalid line range") unless valid_range?(b, e)
[b, e]
end
def valid_range?(first, last)
first <= last && (1..max_line).cover?(first) && (1..max_line).cover?(last)
end
#
# Set line range to be printed by list
#
# @return first line number to list
# @return last line number to list
#
def auto_range(direction)
prev_line = processor.prev_line
if direction == "=" || prev_line.nil?
source_file_formatter.range_around(frame.line)
else
source_file_formatter.range_from(move(prev_line, size, direction))
end
end
def parse_range(input)
first, err = get_int(lower_bound(input), "List", 1, max_line)
raise(err) unless first
if upper_bound(input)
last, err = get_int(upper_bound(input), "List", 1, max_line)
raise(err) unless last
last = amend_final(last)
else
first -= (size / 2)
end
[first, last || move(first, size - 1)]
end
def move(line, size, direction = "+")
line.send(direction, size)
end
#
# Show a range of lines in the current file.
#
# @param min [Integer] Lower bound
# @param max [Integer] Upper bound
#
def display_lines(min, max)
puts "\n[#{min}, #{max}] in #{frame.file}"
puts source_file_formatter.lines(min, max).join
end
#
# @param range [String] A string with an integer range format
#
# @return [String] The lower bound of the given range
#
def lower_bound(range)
split_range(range)[0]
end
#
# @param range [String] A string with an integer range format
#
# @return [String] The upper bound of the given range
#
def upper_bound(range)
split_range(range)[1]
end
#
# @param str [String] A string with an integer range format
#
# @return [Array] The upper & lower bounds of the given range
#
def split_range(str)
str.split(/[-,]/)
end
extend Forwardable
def_delegators :source_file_formatter, :amend_final, :size, :max_line
def source_file_formatter
@source_file_formatter ||= SourceFileFormatter.new(
frame.file,
->(n) { n == frame.line ? "=>" : " " }
)
end
end
end
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