lib/tailor/rulers/spaces_before_comma_ruler.rb
require_relative '../ruler'
class Tailor
module Rulers
# Checks for spaces before a ',' as given by +@config+.
class SpacesBeforeCommaRuler < Tailor::Ruler
def initialize(config, options)
super(config, options)
add_lexer_observers :comma, :comment, :ignored_nl, :nl
@comma_columns = []
end
def comma_update(_, _, column)
@comma_columns << column
end
def comment_update(token, lexed_line, _, lineno, column)
if token =~ /\n$/
log 'Found comment with trailing newline.'
ignored_nl_update(lexed_line, lineno, column)
end
end
# Checks to see if the number of spaces before a comma equals the value
# at +@config+.
#
# @param [Fixnum] actual_spaces The number of spaces before the comma.
# @param [Fixnum] lineno Line the potential problem is on.
# @param [Fixnum] column Column the potential problem is on.
def measure(actual_spaces, lineno, column)
if actual_spaces != @config
msg = "Line has #{actual_spaces} space(s) before a comma, "
msg << "but should have #{@config}."
@problems << Problem.new(problem_type, lineno, column - 1, msg,
@options[:level])
end
end
def check_spaces_before_comma(lexed_line, lineno)
@comma_columns.each do |c|
event_index = lexed_line.event_index(c)
if event_index.nil?
log 'Event index is nil. Weird...'
next
end
previous_event = lexed_line.at(event_index - 1)
actual_spaces = if previous_event[1] != :on_sp
0
else
previous_event.last.size
end
measure(actual_spaces, lineno, c)
end
@comma_columns.clear
end
def ignored_nl_update(lexed_line, lineno, _)
check_spaces_before_comma(lexed_line, lineno)
end
def nl_update(lexed_line, lineno, column)
ignored_nl_update(lexed_line, lineno, column)
end
end
end
end