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100 lines
3.1 KiB
Ruby
100 lines
3.1 KiB
Ruby
module Sass::Tree
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# A static node reprenting a CSS property.
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#
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# @see Sass::Tree
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class AttrNode < Node
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# The name of the property.
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#
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# @return [String]
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attr_accessor :name
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# The value of the property,
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# either a plain string or a SassScript parse tree.
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#
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# @return [String, Script::Node]
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attr_accessor :value
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# @param name [String] See \{#name}
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# @param value [String] See \{#value}
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# @param options [Hash<Symbol, Object>] An options hash;
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# see [the Sass options documentation](../../Sass.html#sass_options)
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def initialize(name, value, options)
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@name = name
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@value = value
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super(options)
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end
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# Compares the names and values of two properties.
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#
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# @param other [Object] The object to compare with
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# @return [Boolean] Whether or not this node and the other object
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# are the same
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def ==(other)
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self.class == other.class && name == other.name && value == other.value && super
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end
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# Computes the CSS for the property.
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#
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# @param tabs [Fixnum] The level of indentation for the CSS
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# @param parent_name [String] The name of the parent property (e.g. `text`) or nil
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# @return [String] The resulting CSS
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def to_s(tabs, parent_name = nil)
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if value[-1] == ?;
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raise Sass::SyntaxError.new("Invalid attribute: #{declaration.dump} (This isn't CSS!).", @line)
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end
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real_name = name
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real_name = "#{parent_name}-#{real_name}" if parent_name
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if value.empty? && children.empty?
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raise Sass::SyntaxError.new("Invalid attribute: #{declaration.dump}.", @line)
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end
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join_string = case @style
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when :compact; ' '
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when :compressed; ''
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else "\n"
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end
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spaces = ' ' * (tabs - 1)
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to_return = ''
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if !value.empty?
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to_return << "#{spaces}#{real_name}:#{@style == :compressed ? '' : ' '}#{value};#{join_string}"
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end
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children.each do |kid|
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to_return << kid.to_s(tabs, real_name) << join_string
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end
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(@style == :compressed && parent_name) ? to_return : to_return[0...-1]
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end
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protected
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# Runs any SassScript that may be embedded in the property.
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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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@name = interpolate(@name, environment)
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@value = @value.is_a?(String) ? interpolate(@value, environment) : @value.perform(environment).to_s
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super
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end
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# Returns an error message if the given child node is invalid,
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# and false otherwise.
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#
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# {AttrNode} only allows other {AttrNode}s and {CommentNode}s as children.
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# @param child [Tree::Node] A potential child node
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# @return [String] An error message if the child is invalid, or nil otherwise
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def invalid_child?(child)
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if !child.is_a?(AttrNode) && !child.is_a?(CommentNode)
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"Illegal nesting: Only attributes may be nested beneath attributes."
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end
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end
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private
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def declaration
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":#{name} #{value}"
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end
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end
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end
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