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Contents
# frozen_string_literal: true module SCSSLint # Checks for unnecessary uses of the parent reference (&) in nested selectors. class Linter::UnnecessaryParentReference < Linter include LinterRegistry MESSAGE = 'Unnecessary parent selector (&)'.freeze def visit_comma_sequence(comma_sequence) @multiple_sequences = comma_sequence.members.size > 1 end def visit_sequence(sequence) return unless sequence_starts_with_parent?(sequence.members.first) # Allow concatentation, e.g. # element { # &.foo {} # } return if sequence.members.first.members.size > 1 # Allow sequences that contain multiple parent references, e.g. # element { # & + & { ... } # } return if sequence.members[1..-1].any? { |ss| sequence_contains_parent_reference?(ss) } # Special case: allow an isolated parent to appear if it is part of a # comma sequence of more than one sequence, as this could be used to DRY # up code. return if @multiple_sequences && isolated_parent?(sequence) add_lint(sequence.members.first.line, MESSAGE) end private def isolated_parent?(sequence) sequence.members.size == 1 && sequence_starts_with_parent?(sequence.members.first) end def sequence_starts_with_parent?(simple_sequence) return unless simple_sequence.is_a?(Sass::Selector::SimpleSequence) first = simple_sequence.members.first first.is_a?(Sass::Selector::Parent) && first.suffix.nil? # Ignore concatenated selectors, like `&-something` end def sequence_contains_parent_reference?(simple_sequence) return unless simple_sequence.is_a?(Sass::Selector::SimpleSequence) simple_sequence.members.any? { |s| s.is_a?(Sass::Selector::Parent) } end end end
Version data entries
22 entries across 22 versions & 1 rubygems
Version | Path |
---|---|
scss_lint-0.45.0 | lib/scss_lint/linter/unnecessary_parent_reference.rb |
scss_lint-0.44.0 | lib/scss_lint/linter/unnecessary_parent_reference.rb |