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Contents
# encoding: utf-8
module RuboCop
module Cop
module Style
# This cop looks for trailing blank lines and a final newline in the
# source code.
class TrailingBlankLines < Cop
include ConfigurableEnforcedStyle
def investigate(processed_source)
sb = processed_source.buffer
return if sb.source.empty?
whitespace_at_end = sb.source[/\s*\Z/]
blank_lines = whitespace_at_end.count("\n") - 1
wanted_blank_lines = style == :final_newline ? 0 : 1
return unless blank_lines != wanted_blank_lines
begin_pos = sb.source.length - whitespace_at_end.length
autocorrect_range = Parser::Source::Range.new(sb, begin_pos,
sb.source.length)
begin_pos += "\n".length unless whitespace_at_end.length == 0
report_range = Parser::Source::Range.new(sb, begin_pos,
sb.source.length)
add_offense(autocorrect_range, report_range,
message(wanted_blank_lines, blank_lines))
end
private
def message(wanted_blank_lines, blank_lines)
case blank_lines
when -1
'Final newline missing.'
when 0
'Trailing blank line missing.'
else
instead_of = if wanted_blank_lines == 0
''
else
"instead of #{wanted_blank_lines} "
end
format('%d trailing blank lines %sdetected.', blank_lines,
instead_of)
end
end
def autocorrect(range)
@corrections << lambda do |corrector|
corrector.replace(range, style == :final_newline ? "\n" : "\n\n")
end
end
end
end
end
end
Version data entries
13 entries across 13 versions & 2 rubygems