Class: Sass::Tree::IfNode

Inherits:
Node show all
Defined in:
lib/sass/tree/if_node.rb

Overview

A dynamic node representing a Sass @if statement.

IfNodes are a little odd, in that they also represent @else and @else ifs. This is done as a linked list: each IfNode has a link (#else) to the next IfNode.

See Also:

Instance Attribute Summary collapse

Attributes inherited from Node

#children, #filename, #line, #options

Instance Method Summary collapse

Methods inherited from Node

#<<, #==, #balance, #interpolate, #invalid_child?, #invisible?, #last, #perform, #perform!, #perform_children, #render, #style, #to_s, #to_sass

Constructor Details

#initialize(expr) ⇒ IfNode

Returns a new instance of IfNode.

Parameters:

  • expr (Script::Expr) —

    The conditional expression. If this is nil, this is an @else node, not an @else if



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# File 'lib/sass/tree/if_node.rb', line 19

def initialize(expr)
  @expr = expr
  @last_else = self
  super()
end

Instance Attribute Details

#else ⇒ IfNode

The next Sass::Tree::IfNode in the if-else list, or nil.

Returns:



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# File 'lib/sass/tree/if_node.rb', line 15

def else
  @else
end

Instance Method Details

#_perform(environment) ⇒ Array<Tree::Node> (protected)

Runs the child nodes if the conditional expression is true; otherwise, tries the #else nodes.

Parameters:

  • environment (Sass::Environment) —

    The lexical environment containing variable and mixin values

Returns:

  • (Array<Tree::Node>) —

    The resulting static nodes

See Also:



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# File 'lib/sass/tree/if_node.rb', line 47

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

#add_else(node) ⇒ Object

Append an @else node to the end of the list.

Parameters:

  • node (IfNode) —

    The @else node to append



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# File 'lib/sass/tree/if_node.rb', line 28

def add_else(node)
  @last_else.else = node
  @last_else = node
end

#options=(options) ⇒ Object 



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# File 'lib/sass/tree/if_node.rb', line 33

def options=(options)
  super
  self.else.options = options if self.else
end