class 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[R]

The array of individual selectors.

@return [Array<Simple>]

Public Class Methods

new(selectors) click to toggle source

@param selectors [Array<Simple>] See {#members}

# File lib/sass/selector/simple_sequence.rb, line 29
def initialize(selectors)
  @members = selectors
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 17
def base
  @base ||= (members.first if members.first.is_a?(Element) || members.first.is_a?(Universal))
end
do_extend(extends, 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) @param extends [{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`.

@see Sass::Selector::CommaSequence#do_extend

# File lib/sass/selector/simple_sequence.rb, line 63
def do_extend(extends, seen = Set.new)
  extends.get(members.to_set).map do |seq, sels|
    # If A {@extend B} and C {...},
    # seq is A, sels is B, and self is C

    self_without_sel = self.members - sels
    next unless unified = seq.members.last.unify(self_without_sel)
    [sels, seq.members[0...-1] + [unified]]
  end.compact.map do |sels, seq|
    seq = Sequence.new(seq)
    seen.include?(sels) ? [] : seq.do_extend(extends, 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 119
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 41
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])]
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 24
def rest
  @rest ||= Set.new(base ? members[1..-1] : members)
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 106
def superselector?(sseq)
  (base.nil? || base.eql?(sseq.base)) && rest.subset?(sseq.rest)
end
to_a() click to toggle source

@see Sass::Selector::Simple#to_a

# File lib/sass/selector/simple_sequence.rb, line 111
def to_a
  @members.map {|sel| sel.to_a}.flatten
end
unify(sels) click to toggle source

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

@param sels [Array<Simple>] A {SimpleSequence}'s {#members members array} @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 90
def unify(sels)
  return unless sseq = members.inject(sels) do |sseq, sel|
    return unless sseq
    sel.unify(sseq)
  end
  SimpleSequence.new(sseq)
end