/usr/lib/ruby/vendor_ruby/sass/selector/sequence.rb is in ruby-sass 3.1.15-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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module Selector
# An operator-separated sequence of
# {SimpleSequence simple selector sequences}.
class Sequence < AbstractSequence
# Sets the line of the Sass template on which this selector was declared.
# This also sets the line for all child selectors.
#
# @param line [Fixnum]
# @return [Fixnum]
def line=(line)
members.each {|m| m.line = line if m.is_a?(SimpleSequence)}
line
end
# Sets the name of the file in which this selector was declared,
# or `nil` if it was not declared in a file (e.g. on stdin).
# This also sets the filename for all child selectors.
#
# @param filename [String, nil]
# @return [String, nil]
def filename=(filename)
members.each {|m| m.filename = filename if m.is_a?(SimpleSequence)}
filename
end
# The array of {SimpleSequence simple selector sequences}, operators, and newlines.
# The operators are strings such as `"+"` and `">"`
# representing the corresponding CSS operators.
# Newlines are also newline strings;
# these aren't semantically relevant,
# but they do affect formatting.
#
# @return [Array<SimpleSequence, String>]
attr_reader :members
# @param seqs_and_ops [Array<SimpleSequence, String>] See \{#members}
def initialize(seqs_and_ops)
@members = seqs_and_ops
end
# Resolves the {Parent} selectors within this selector
# by replacing them with the given parent selector,
# handling commas appropriately.
#
# @param super_seq [Sequence] The parent selector sequence
# @return [Sequence] This selector, with parent references resolved
# @raise [Sass::SyntaxError] If a parent selector is invalid
def resolve_parent_refs(super_seq)
members = @members
nl = (members.first == "\n" && members.shift)
unless members.any? do |seq_or_op|
seq_or_op.is_a?(SimpleSequence) && seq_or_op.members.first.is_a?(Parent)
end
members = []
members << nl if nl
members << SimpleSequence.new([Parent.new])
members += @members
end
Sequence.new(
members.map do |seq_or_op|
next seq_or_op unless seq_or_op.is_a?(SimpleSequence)
seq_or_op.resolve_parent_refs(super_seq)
end.flatten)
end
# Non-destructively extends this selector with the extensions specified in a hash
# (which should come from {Sass::Tree::Visitors::Cssize}).
#
# @overload def do_extend(extends)
# @param extends [Sass::Util::SubsetMap{Selector::Simple => Selector::Sequence}]
# The extensions to perform on this selector
# @return [Array<Sequence>] A list of selectors generated
# by extending this selector with `extends`.
# These correspond to a {CommaSequence}'s {CommaSequence#members members array}.
# @see CommaSequence#do_extend
def do_extend(extends, seen = Set.new)
paths = Sass::Util.paths(members.map do |sseq_or_op|
next [[sseq_or_op]] unless sseq_or_op.is_a?(SimpleSequence)
extended = sseq_or_op.do_extend(extends, seen)
choices = extended.map {|seq| seq.members}
choices.unshift([sseq_or_op]) unless extended.any? {|seq| seq.superselector?(sseq_or_op)}
choices
end)
Sass::Util.flatten(paths.map {|path| weave(path)}, 1).map {|p| Sequence.new(p)}
end
# Returns whether or not this selector matches all elements
# that the given selector matches (as well as possibly more).
#
# @example
# (.foo).superselector?(.foo.bar) #=> true
# (.foo).superselector?(.bar) #=> false
# (.bar .foo).superselector?(.foo) #=> false
# @param sseq [SimpleSequence]
# @return [Boolean]
def superselector?(sseq)
return false unless members.size == 1
members.last.superselector?(sseq)
end
# @see Simple#to_a
def to_a
ary = @members.map {|seq_or_op| seq_or_op.is_a?(SimpleSequence) ? seq_or_op.to_a : seq_or_op}
Sass::Util.intersperse(ary, " ").flatten.compact
end
# Returns a string representation of the sequence.
# This is basically the selector string.
#
# @return [String]
def inspect
members.map {|m| m.inspect}.join(" ")
end
private
# Conceptually, this expands "parenthesized selectors".
# That is, if we have `.A .B {@extend .C}` and `.D .C {...}`,
# this conceptually expands into `.D .C, .D (.A .B)`,
# and this function translates `.D (.A .B)` into `.D .A .B, .A.D .B, .D .A .B`.
#
# @param path [Array<Array<SimpleSequence or String>>] A list of parenthesized selector groups.
# @return [Array<Array<SimpleSequence or String>>] A list of fully-expanded selectors.
def weave(path)
befores = [[]]
afters = path.dup
until afters.empty?
current = afters.shift.dup
last_current = [current.pop]
while !current.empty? && last_current.first.is_a?(String) || current.last.is_a?(String)
last_current.unshift(current.pop)
end
befores = Sass::Util.flatten(befores.map do |before|
next [] unless sub = subweave(before, current)
sub.map {|seqs| seqs + last_current}
end, 1)
end
return befores
end
# This interweaves two lists of selectors,
# returning all possible orderings of them (including using unification)
# that maintain the relative ordering of the input arrays.
#
# For example, given `.foo .bar` and `.baz .bang`,
# this would return `.foo .bar .baz .bang`, `.foo .bar.baz .bang`,
# `.foo .baz .bar .bang`, `.foo .baz .bar.bang`, `.foo .baz .bang .bar`,
# and so on until `.baz .bang .foo .bar`.
#
# @param seq1 [Array<SimpleSequence or String>]
# @param seq2 [Array<SimpleSequence or String>]
# @return [Array<Array<SimpleSequence or String>>]
def subweave(seq1, seq2)
return [seq2] if seq1.empty?
return [seq1] if seq2.empty?
return unless init = merge_initial_ops(seq1, seq2)
seq1 = group_selectors(seq1)
seq2 = group_selectors(seq2)
lcs = Sass::Util.lcs(seq2, seq1) do |s1, s2|
next s1 if s1 == s2
next unless s1.first.is_a?(SimpleSequence) && s2.first.is_a?(SimpleSequence)
next s2 if subweave_superselector?(s1, s2)
next s1 if subweave_superselector?(s2, s1)
end
diff = [[init]]
until lcs.empty?
diff << chunks(seq1, seq2) {|s| subweave_superselector?(s.first, lcs.first)} << [lcs.shift]
seq1.shift
seq2.shift
end
diff << chunks(seq1, seq2) {|s| s.empty?}
diff.reject! {|c| c.empty?}
Sass::Util.paths(diff).map {|p| p.flatten}
end
# Extracts initial selector operators (`"+"`, `">"`, `"~"`, and `"\n"`)
# from two sequences and merges them together into a single array of
# selector operators.
#
# @param seq1 [Array<SimpleSequence or String>]
# @param seq2 [Array<SimpleSequence or String>]
# @return [Array<String>, nil] If there are no operators in the merged
# sequence, this will be the empty array. If the operators cannot be
# merged, this will be nil.
def merge_initial_ops(seq1, seq2)
ops1, ops2 = [], []
ops1 << seq1.shift while seq1.first.is_a?(String)
ops2 << seq2.shift while seq2.first.is_a?(String)
newline = false
newline ||= !!ops1.shift if ops1.first == "\n"
newline ||= !!ops2.shift if ops2.first == "\n"
# If neither sequence is a subsequence of the other, they cannot be
# merged successfully
lcs = Sass::Util.lcs(ops1, ops2)
return unless lcs == ops1 || lcs == ops2
return (newline ? ["\n"] : []) + (ops1.size > ops2.size ? ops1 : ops2)
end
# Takes initial subsequences of `seq1` and `seq2` and returns all
# orderings of those subsequences. The initial subsequences are determined
# by a block.
#
# Destructively removes the initial subsequences of `seq1` and `seq2`.
#
# For example, given `(A B C | D E)` and `(1 2 | 3 4 5)` (with `|`
# denoting the boundary of the initial subsequence), this would return
# `[(A B C 1 2), (1 2 A B C)]`. The sequences would then be `(D E)` and
# `(3 4 5)`.
#
# @param seq1 [Array]
# @param seq2 [Array]
# @yield [a] Used to determine when to cut off the initial subsequences.
# Called repeatedly for each sequence until it returns true.
# @yieldparam a [Array] A final subsequence of one input sequence after
# cutting off some initial subsequence.
# @yieldreturn [Boolean] Whether or not to cut off the initial subsequence
# here.
def chunks(seq1, seq2)
chunk1 = []
chunk1 << seq1.shift until yield seq1
chunk2 = []
chunk2 << seq2.shift until yield seq2
return [] if chunk1.empty? && chunk2.empty?
return [chunk2] if chunk1.empty?
return [chunk1] if chunk2.empty?
[chunk1 + chunk2, chunk2 + chunk1]
end
# Groups a sequence into subsequences. The subsequences are determined by
# strings; adjacent non-string elements will be put into separate groups,
# but any element adjacent to a string will be grouped with that string.
#
# For example, `(A B "C" D E "F" G "H" "I" J)` will become `[(A) (B "C" D)
# (E "F" G "H" "I" J)]`.
#
# @param seq [Array]
# @return [Array<Array>]
def group_selectors(seq)
newseq = []
tail = seq.dup
until tail.empty?
head = []
begin
head << tail.shift
end while !tail.empty? && head.last.is_a?(String) || tail.first.is_a?(String)
newseq << head
end
return newseq
end
# Given two sequences of simple selectors, returns whether `sseq1` is a
# superselector of `sseq2`.
#
# @param sseq1 [Array<SimpleSelector or String>]
# @param sseq2 [Array<SimpleSelector or String>]
# @return [Boolean]
def subweave_superselector?(sseq1, sseq2)
if sseq1.size > 1
# More complex selectors are never superselectors of less complex ones
return unless sseq2.size > 1
# .foo ~ .bar is a superselector of .foo + .bar
return unless sseq1[1] == "~" ? sseq2[1] != ">" : sseq2[1] == sseq1[1]
return unless sseq1.first.superselector?(sseq2.first)
return true if sseq1.size == 2
return false if sseq2.size == 2
return subweave_superselector?(sseq1[2..-1], sseq2[2..-1])
elsif sseq2.size > 1
return true if sseq2[1] == ">" && sseq1.first.superselector?(sseq2.first)
return false if sseq2.size == 2
return subweave_superselector?(sseq1, sseq2[2..-1])
else
sseq1.first.superselector?(sseq2.first)
end
end
def _hash
members.reject {|m| m == "\n"}.hash
end
def _eql?(other)
other.members.reject {|m| m == "\n"}.eql?(self.members.reject {|m| m == "\n"})
end
end
end
end
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