Class: Sass::Tree::IfNode

Inherits:
Node
  • Object
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:

Constant Summary

Constants inherited from Node

Node::SAVED_OPTIONS

Instance Attribute Summary collapse

Attributes inherited from Node

#children, #filename, #has_children, #line, #options

Instance Method Summary collapse

Methods inherited from Node

#<<, #==, #_around_dump, #_cssize, #_to_s, #balance, #check_child!, #children_to_src, #cssize, #cssize!, #dasherize, #do_extend, #each, #invisible?, #perform, #perform!, #perform_children, #run_interp, #selector_to_sass, #selector_to_scss, #selector_to_src, #semi, #style, #to_s, #to_sass, #to_scss

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 62

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)

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

#invalid_child?(child) ⇒ Boolean, String (protected)

Returns an error message if the given child node is invalid, and false otherwise.

ExtendNodes are valid within Sass::Tree::IfNodes.

Parameters:

Returns:

  • (Boolean, String) —

    Whether or not the child node is valid, as well as the error message to display if it is invalid



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# File 'lib/sass/tree/if_node.rb', line 77

def invalid_child?(child)
  super unless child.is_a?(ExtendNode)
end

#options=(options)

See Also:



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# File 'lib/sass/tree/if_node.rb', line 34

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

#to_src(tabs, opts, fmt, is_else = false) (protected)

See Also:



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# File 'lib/sass/tree/if_node.rb', line 42

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