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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