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Contents
# frozen_string_literal: true
require 'set'
module RuboCop
module Cop
module Layout
# This cop checks for tabs inside the source code.
#
# @example
# # bad
# # This example uses a tab to indent bar.
# def foo
# bar
# end
#
# # good
# # This example uses spaces to indent bar.
# def foo
# bar
# end
#
class Tab < Cop
include Alignment
include RangeHelp
MSG = 'Tab detected.'
def investigate(processed_source)
str_ranges = string_literal_ranges(processed_source.ast)
processed_source.lines.each.with_index(1) do |line, lineno|
match = line.match(/\t+/)
next unless match
range = source_range(processed_source.buffer,
lineno,
match.begin(0)...match.end(0))
next if in_string_literal?(str_ranges, range)
add_offense(range, location: range)
end
end
def autocorrect(range)
lambda do |corrector|
spaces = ' ' * configured_indentation_width
corrector.replace(range, range.source.gsub(/\t/, spaces))
end
end
private
def in_string_literal?(ranges, tabs_range)
ranges.any? { |range| range.contains?(tabs_range) }
end
def string_literal_ranges(ast)
# which lines start inside a string literal?
return [] if ast.nil?
ast.each_node(:str, :dstr).each_with_object(Set.new) do |str, ranges|
loc = str.location
if str.heredoc?
ranges << loc.heredoc_body
elsif loc.respond_to?(:begin) && loc.begin
ranges << loc.expression
end
end
end
end
end
end
end
Version data entries
32 entries across 21 versions & 3 rubygems