lib/rubocop/cop/mixin/alignment.rb
# frozen_string_literal: true
module RuboCop
module Cop
# This module checks for nodes that should be aligned to the left or right.
# This amount is determined by the instance variable @column_delta.
module Alignment
private
SPACE = ' '
attr_reader :column_delta
def configured_indentation_width
cop_config['IndentationWidth'] || config.for_cop('Layout/IndentationWidth')['Width'] || 2
end
def indentation(node)
offset(node) + (SPACE * configured_indentation_width)
end
def offset(node)
SPACE * node.loc.column
end
def check_alignment(items, base_column = nil)
base_column ||= display_column(items.first.source_range) unless items.empty?
each_bad_alignment(items, base_column) do |current|
expr = current.source_range
if @current_offenses&.any? { |o| within?(expr, o.location) }
# If this offense is within a line range that is already being
# realigned by autocorrect, we report the offense without
# autocorrecting it. Two rewrites in the same area by the same
# cop cannot be handled. The next iteration will find the
# offense again and correct it.
register_offense(expr, nil)
else
register_offense(current, current)
end
end
end
# @api private
def each_bad_alignment(items, base_column)
prev_line = -1
items.each do |current|
if current.loc.line > prev_line && begins_its_line?(current.source_range)
@column_delta = base_column - display_column(current.source_range)
yield current if @column_delta.nonzero?
end
prev_line = current.loc.line
end
end
# @api public
def display_column(range)
line = processed_source.lines[range.line - 1]
Unicode::DisplayWidth.of(line[0, range.column])
end
# @api public
def within?(inner, outer)
inner.begin_pos >= outer.begin_pos && inner.end_pos <= outer.end_pos
end
# @deprecated Use processed_source.comment_at_line(line)
def end_of_line_comment(line)
processed_source.line_with_comment?(line)
end
# @api private
def register_offense(offense_node, message_node)
add_offense(offense_node, message: message(message_node)) do |corrector|
autocorrect(corrector, message_node)
end
end
end
end
end