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module Sass::Script::Tree
# A class representing a map literal. When resolved, this returns a
# {Sass::Script::Node::Map}.
class MapLiteral < Node
# The key/value pairs that make up this map node. This isn't a Hash so that
# we can detect key collisions once all the keys have been performed.
#
# @return [Array<(Node, Node)>]
attr_reader :pairs
# Creates a new map literal.
#
# @param pairs [Array<(Node, Node)>] See \{#pairs}
def initialize(pairs)
@pairs = pairs
end
# @see Node#children
def children
@pairs.flatten
end
# @see Node#to_sass
def to_sass(opts = {})
return "()" if pairs.empty?
to_sass = lambda do |value|
if value.is_a?(ListLiteral) && value.separator == :comma
"(#{value.to_sass(opts)})"
else
value.to_sass(opts)
end
end
"(" + pairs.map {|(k, v)| "#{to_sass[k]}: #{to_sass[v]}"}.join(', ') + ")"
end
alias_method :inspect, :to_sass
# @see Node#deep_copy
def deep_copy
node = dup
node.instance_variable_set('@pairs',
pairs.map {|(k, v)| [k.deep_copy, v.deep_copy]})
node
end
protected
# @see Node#_perform
def _perform(environment)
keys = Set.new
map = Sass::Script::Value::Map.new(Hash[pairs.map do |(k, v)|
k, v = k.perform(environment), v.perform(environment)
if keys.include?(k)
raise Sass::SyntaxError.new("Duplicate key #{k.inspect} in map #{to_sass}.")
end
keys << k
[k, v]
end])
map.options = options
map
end
end
end
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