55 lines
1.5 KiB
Ruby
55 lines
1.5 KiB
Ruby
require 'sass/tree/node'
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module Sass::Tree
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# A dynamic node representing a Sass `@if` statement.
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#
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# {IfNode}s are a little odd, in that they also represent `@else` and `@else if`s.
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# This is done as a linked list:
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# each {IfNode} has a link (\{#else}) to the next {IfNode}.
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#
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# @see Sass::Tree
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class IfNode < Node
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# The next {IfNode} in the if-else list, or `nil`.
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#
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# @return [IfNode]
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attr_accessor :else
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# @param expr [Script::Expr] The conditional expression.
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# If this is nil, this is an `@else` node, not an `@else if`
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def initialize(expr)
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@expr = expr
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@last_else = self
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super()
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end
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# Append an `@else` node to the end of the list.
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#
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# @param node [IfNode] The `@else` node to append
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def add_else(node)
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@last_else.else = node
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@last_else = node
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end
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def options=(options)
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super
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self.else.options = options if self.else
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end
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protected
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# Runs the child nodes if the conditional expression is true;
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# otherwise, tries the \{#else} nodes.
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#
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# @param environment [Sass::Environment] The lexical environment containing
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# variable and mixin values
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# @return [Array<Tree::Node>] The resulting static nodes
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# @see Sass::Tree
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def _perform(environment)
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environment = Sass::Environment.new(environment)
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return perform_children(environment) if @expr.nil? || @expr.perform(environment).to_bool
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return @else.perform(environment) if @else
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[]
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end
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end
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end
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