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Contents
require 'sass/tree/node'
module Sass::Tree
# A dynamic node representing a Sass `@if` statement.
#
# {IfNode}s are a little odd, in that they also represent `@else` and `@else if`s.
# This is done as a linked list:
# each {IfNode} has a link (\{#else}) to the next {IfNode}.
#
# @see Sass::Tree
class IfNode < Node
# The next {IfNode} in the if-else list, or `nil`.
#
# @return [IfNode]
attr_accessor :else
# @param expr [Script::Expr] The conditional expression.
# If this is nil, this is an `@else` node, not an `@else if`
def initialize(expr)
@expr = expr
@last_else = self
super()
end
# Append an `@else` node to the end of the list.
#
# @param node [IfNode] The `@else` node to append
def add_else(node)
@last_else.else = node
@last_else = node
end
# @see Node#options=
def options=(options)
super
self.else.options = options if self.else
end
protected
# @see Node#to_src
def to_src(tabs, opts, fmt, is_else = false)
name =
if !is_else; "if"
elsif @expr; "else if"
else; "else"
end
str = "#{' ' * tabs}@#{name}"
str << " #{@expr.to_sass(opts)}" if @expr
str << children_to_src(tabs, opts, fmt)
str << @else.send(:to_src, tabs, opts, fmt, true) if @else
str
end
# Runs the child nodes if the conditional expression is true;
# otherwise, tries the \{#else} nodes.
#
# @param environment [Sass::Environment] The lexical environment containing
# variable and mixin values
# @return [Array<Tree::Node>] The resulting static nodes
# @see Sass::Tree
def _perform(environment)
environment = Sass::Environment.new(environment)
return perform_children(environment) if @expr.nil? || @expr.perform(environment).to_bool
return @else.perform(environment) if @else
[]
end
end
end
Version data entries
31 entries across 31 versions & 2 rubygems