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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# This cop checks ensures source files have no utf-8 encoding comments.
# @example
# # bad
# # encoding: UTF-8
# # coding: UTF-8
# # -*- coding: UTF-8 -*-
class Encoding < Cop
include RangeHelp
MSG_UNNECESSARY = 'Unnecessary utf-8 encoding comment.'.freeze
ENCODING_PATTERN = /#.*coding\s?[:=]\s?(?:UTF|utf)-8/.freeze
SHEBANG = '#!'.freeze
def investigate(processed_source)
return if processed_source.buffer.source.empty?
line_number = encoding_line_number(processed_source)
return unless (@message = offense(processed_source, line_number))
range = processed_source.buffer.line_range(line_number + 1)
add_offense(range, location: range, message: @message)
end
def autocorrect(range)
lambda do |corrector|
corrector.remove(range_with_surrounding_space(range: range,
side: :right))
end
end
private
def offense(processed_source, line_number)
line = processed_source[line_number]
MSG_UNNECESSARY if encoding_omitable?(line)
end
def encoding_omitable?(line)
line =~ ENCODING_PATTERN
end
def encoding_line_number(processed_source)
line_number = 0
line_number += 1 if processed_source[line_number].start_with?(SHEBANG)
line_number
end
end
end
end
end
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