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Sass::Selector::SimpleSequence

A unseparated sequence of selectors that all apply to a single element. For example, `.foo#bar` is a simple sequence of the selectors `.foo`, `bar`, and `[attr=baz]`.

Attributes

members[RW]

The array of individual selectors.

@return [Array<Simple>]

sources[RW]

The extending selectors that caused this selector sequence to be generated. For example:

a.foo { ... }
b.bar {@extend a}
c.baz {@extend b}

The generated selector `b.foo.bar` has `{b.bar}` as its `sources` set, and the generated selector `c.foo.bar.baz` has `{b.bar, c.baz}` as its `sources` set.

This is populated during the {do_extend} process.

@return {Set<Sequence>}

subject[W]

@see {#subject?}

Public Class Methods

new(selectors, subject, sources = Set.new) click to toggle source

@param selectors [Array<Simple>] See {#members} @param subject [Boolean] See {#subject?} @param sources [Set<Sequence>]

# File lib/sass/selector/simple_sequence.rb, line 59
def initialize(selectors, subject, sources = Set.new)
  @members = selectors
  @subject = subject
  @sources = sources
end

Public Instance Methods

base() click to toggle source

Returns the element or universal selector in this sequence, if it exists.

@return [Element, Universal, nil]

# File lib/sass/selector/simple_sequence.rb, line 36
def base
  @base ||= (members.first if members.first.is_a?(Element) || members.first.is_a?(Universal))
end
do_extend(extends, parent_directives, seen = Set.new) click to toggle source

Non-destrucively extends this selector with the extensions specified in a hash (which should come from {Sass::Tree::Visitors::Cssize}).

@overload def do_extend(extends, parent_directives) @param extends [{Selector::Simple =>

               Sass::Tree::Visitors::Cssize::Extend}]
The extensions to perform on this selector

@param parent_directives [Array<Sass::Tree::DirectiveNode>]

The directives containing this selector.

@return [Array<Sequence>] A list of selectors generated

by extending this selector with `extends`.

@see CommaSequence#do_extend

# File lib/sass/selector/simple_sequence.rb, line 98
def do_extend(extends, parent_directives, seen = Set.new)
  Sass::Util.group_by_to_a(extends.get(members.to_set)) {|ex, _| ex.extender}.map do |seq, group|
    sels = group.map {|_, s| s}.flatten
    # If A {@extend B} and C {...},
    # seq is A, sels is B, and self is C

    self_without_sel = self.members - sels
    group.each {|e, _| e.result = :failed_to_unify unless e.result == :succeeded}
    next unless unified = seq.members.last.unify(self_without_sel, subject?)
    group.each {|e, _| e.result = :succeeded}
    next if group.map {|e, _| check_directives_match!(e, parent_directives)}.none?
    new_seq = Sequence.new(seq.members[0...-1] + [unified])
    new_seq.add_sources!(sources + [seq])
    [sels, new_seq]
  end.compact.map do |sels, seq|
    seen.include?(sels) ? [] : seq.do_extend(extends, parent_directives, seen + [sels])
  end.flatten.uniq
end
inspect() click to toggle source

Returns a string representation of the sequence. This is basically the selector string.

@return [String]

# File lib/sass/selector/simple_sequence.rb, line 162
def inspect
  members.map {|m| m.inspect}.join
end
resolve_parent_refs(super_seq) click to toggle source

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 [Array<SimpleSequence>] This selector, with parent references resolved.

This is an array because the parent selector is itself a {Sequence}

@raise [Sass::SyntaxError] If a parent selector is invalid

# File lib/sass/selector/simple_sequence.rb, line 73
def resolve_parent_refs(super_seq)
  # Parent selector only appears as the first selector in the sequence
  return [self] unless @members.first.is_a?(Parent)

  return super_seq.members if @members.size == 1
  unless super_seq.members.last.is_a?(SimpleSequence)
    raise Sass::SyntaxError.new("Invalid parent selector: " + super_seq.to_a.join)
  end

  super_seq.members[0...-1] +
    [SimpleSequence.new(super_seq.members.last.members + @members[1..-1], subject?)]
end
rest() click to toggle source

Returns the non-base selectors in this sequence.

@return [Set<Simple>]

# File lib/sass/selector/simple_sequence.rb, line 43
def rest
  @rest ||= Set.new(base ? members[1..-1] : members)
end
subject?() click to toggle source

Whether or not this compound selector is the subject of the parent selector; that is, whether it is prepended with `$` and represents the actual element that will be selected.

@return [Boolean]

# File lib/sass/selector/simple_sequence.rb, line 52
def subject?
  @subject
end
superselector?(sseq) click to toggle source

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

@param sseq [SimpleSequence] @return [Boolean]

# File lib/sass/selector/simple_sequence.rb, line 147
def superselector?(sseq)
  (base.nil? || base.eql?(sseq.base)) && rest.subset?(sseq.rest)
end
to_a() click to toggle source

@see Simple#to_a

# File lib/sass/selector/simple_sequence.rb, line 152
def to_a
  res = @members.map {|sel| sel.to_a}.flatten
  res << '!' if subject?
  res
end
unify(sels, other_subject) click to toggle source

Unifies this selector with another {SimpleSequence}'s {SimpleSequence#members members array}, returning another `SimpleSequence` that matches both this selector and the input selector.

@param sels [Array<Simple>] A {SimpleSequence}'s {SimpleSequence#members members array} @param subject [Boolean] Whether the {SimpleSequence} being merged is a subject. @return [SimpleSequence, nil] A {SimpleSequence} matching both `sels` and this selector,

or `nil` if this is impossible (e.g. unifying `#foo` and `#bar`)

@raise [Sass::SyntaxError] If this selector cannot be unified.

This will only ever occur when a dynamic selector,
such as {Parent} or {Interpolation}, is used in unification.
Since these selectors should be resolved
by the time extension and unification happen,
this exception will only ever be raised as a result of programmer error
# File lib/sass/selector/simple_sequence.rb, line 131
def unify(sels, other_subject)
  return unless sseq = members.inject(sels) do |sseq, sel|
    return unless sseq
    sel.unify(sseq)
  end
  SimpleSequence.new(sseq, other_subject || subject?)
end
with_more_sources(sources) click to toggle source

Return a copy of this simple sequence with `sources` merged into the {sources} set.

@param sources [Set<Sequence>] @return [SimpleSequence]

# File lib/sass/selector/simple_sequence.rb, line 171
def with_more_sources(sources)
  sseq = dup
  sseq.members = members.dup
  sseq.sources.merge sources
  sseq
end

[Validate]

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