class RuboCop::Cop::Style::MultilineBlockLayout
This cop checks whether the multiline do end blocks have a newline after the start of the block. Additionally, it checks whether the block arguments, if any, are on the same line as the start of the block.
@example
# bad blah do |i| foo(i) bar(i) end # bad blah do |i| foo(i) bar(i) end # good blah do |i| foo(i) bar(i) end # bad blah { |i| foo(i) bar(i) } # good blah { |i| foo(i) bar(i) }
Constants
- ARG_MSG
- MSG
Public Instance Methods
add_offense_for_expression(node, expr, msg)
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# File lib/rubocop/cop/style/multiline_block_layout.rb, line 66 def add_offense_for_expression(node, expr, msg) expression = expr.source_range range = Parser::Source::Range.new(expression.source_buffer, expression.begin_pos, expression.end_pos) add_offense(node, range, msg) end
autocorrect(node)
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# File lib/rubocop/cop/style/multiline_block_layout.rb, line 75 def autocorrect(node) lambda do |corrector| _method, args, block_body = *node unless args.children.empty? || args.loc.last_line == node.loc.line autocorrect_arguments(corrector, node, args) expr_before_body = args.source_range.end end return unless block_body expr_before_body ||= node.loc.begin if expr_before_body.line == block_body.loc.line autocorrect_body(corrector, node, block_body) end end end
autocorrect_arguments(corrector, node, args)
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# File lib/rubocop/cop/style/multiline_block_layout.rb, line 92 def autocorrect_arguments(corrector, node, args) end_pos = range_with_surrounding_space(args.source_range, :right, false) .end_pos range = Parser::Source::Range.new(args.source_range.source_buffer, node.loc.begin.end.begin_pos, end_pos) corrector.replace(range, " |#{block_arg_string(args)}|") end
autocorrect_body(corrector, node, block_body)
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# File lib/rubocop/cop/style/multiline_block_layout.rb, line 102 def autocorrect_body(corrector, node, block_body) first_node = if block_body.type == :begin block_body.children.first else block_body end block_start_col = node.source_range.column corrector.insert_before(first_node.source_range, "\n #{' ' * block_start_col}") end
block_arg_string(args)
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# File lib/rubocop/cop/style/multiline_block_layout.rb, line 115 def block_arg_string(args) args.children.map do |arg| if arg.mlhs_type? "(#{block_arg_string(arg)})" else arg.source end end.join(', ') end
on_block(node)
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# File lib/rubocop/cop/style/multiline_block_layout.rb, line 44 def on_block(node) end_loc = node.loc.end do_loc = node.loc.begin # Actually it's either do or {. return if do_loc.line == end_loc.line # One-liner, no newline needed. # A block node has three children: the block start, # the arguments, and the expression. We care if the block start # with arguments and the expression start on the same line. _block_start, args, last_expression = node.children unless args.children.empty? if do_loc.line != args.loc.last_line add_offense_for_expression(node, args, ARG_MSG) end end return unless last_expression expression_loc = last_expression.loc return unless do_loc.line == expression_loc.line add_offense_for_expression(node, last_expression, MSG) end