35 lines
992 B
Ruby
35 lines
992 B
Ruby
module Sass
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module Tree
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# A dynamic node representing a variable definition.
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#
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# @see Sass::Tree
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class VariableNode < Node
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# @param name [String] The name of the variable
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# @param expr [Script::Node] The parse tree for the initial variable value
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# @param guarded [Boolean] Whether this is a guarded variable assignment (`||=`)
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def initialize(name, expr, guarded)
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@name = name
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@expr = expr
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@guarded = guarded
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super()
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end
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protected
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# Loads the new variable value into the environment.
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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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def _perform(environment)
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if @guarded && environment.var(@name).nil?
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environment.set_var(@name, @expr.perform(environment))
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elsif !@guarded
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environment.set_var(@name, @expr.perform(environment))
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end
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[]
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end
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end
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end
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end
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