1 # Nick's web site: Helper to retrieve global style variables in ruby.
3 # Copyright © 2020, 2022 Nick Bowler
5 # This program is free software: you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation, either version 3 of the License, or
8 # (at your option) any later version.
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with this program. If not, see <https://www.gnu.org/licenses/>.
20 class GetSCSSGlobals < Sass::Tree::Visitors::Perform
21 def self.visit(root, name = nil)
24 result = x.instance_variable_get(:@globals)
25 return result.freeze if name.nil?
27 x.send(:rubify_result, result[name])
32 def initialize(environment)
34 @globals.default_proc = proc { |h, k|
35 if h.key? k.to_s then h[k.to_s] end }
39 def visit_variable(node)
42 x = @environment.global_env.var(node.name)
43 @globals[node.name] = x unless x.nil?
46 # Convert SASS maps and lists to ruby equivalents that are actually usable.
47 def rubify_result(val)
49 when Sass::Script::Value::Map
50 val.to_h.each_with_object({}) do |(k, v), h|
51 h[k.to_s.to_sym] = rubify_result(v)
53 when Sass::Script::Value::List
54 val.to_a.map { |v| rubify_result(v) }
61 def scss_get_var(variable, item = @items["/style.scss"])
62 engine = Sass::Engine.for_file(item.raw_filename, {
66 return GetSCSSGlobals.visit(engine.to_tree, variable)
69 def scss_get_colour(colour, index = 0, item = @items["/style.scss"])
70 cmap = scss_get_var(:colourmap, item);
71 [cmap[colour]].flatten[index]