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# A visitor for performing selector inheritance on a static CSS tree.
#
# Destructively modifies the tree.
class Sass::Tree::Visitors::Extend < Sass::Tree::Visitors::Base
# Performs the given extensions on the static CSS tree based in `root`, then
# validates that all extends matched some selector.
#
# @param root [Tree::Node] The root node of the tree to visit.
# @param extends [Sass::Util::SubsetMap{Selector::Simple =>
# Sass::Tree::Visitors::Cssize::Extend}]
# The extensions to perform on this tree.
# @return [Object] The return value of \{#visit} for the root node.
def self.visit(root, extends)
return if extends.empty?
new(extends).send(:visit, root)
check_extends_fired! extends
end
protected
def initialize(extends)
@parent_directives = []
@extends = extends
end
# If an exception is raised, this adds proper metadata to the backtrace.
def visit(node)
super(node)
rescue Sass::SyntaxError => e
e.modify_backtrace(:filename => node.filename, :line => node.line)
raise e
end
# Keeps track of the current parent directives.
def visit_children(parent)
@parent_directives.push parent if parent.is_a?(Sass::Tree::DirectiveNode)
super
ensure
@parent_directives.pop if parent.is_a?(Sass::Tree::DirectiveNode)
end
# Applies the extend to a single rule's selector.
def visit_rule(node)
node.resolved_rules = node.resolved_rules.do_extend(@extends, @parent_directives)
end
class << self
private
def check_extends_fired!(extends)
extends.each_value do |ex|
next if ex.success || ex.node.optional?
message = "\"#{ex.extender}\" failed to @extend \"#{ex.target.join}\"."
# TODO(nweiz): this should use the Sass stack trace of the extend node.
raise Sass::SyntaxError.new(<<MESSAGE, :filename => ex.node.filename, :line => ex.node.line)
#{message}
The selector "#{ex.target.join}" was not found.
Use "@extend #{ex.target.join} !optional" if the extend should be able to fail.
MESSAGE
end
end
end
end
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