discourse/lib/sass/discourse_sass_compiler.rb

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require_dependency 'sass/discourse_sass_importer'
class DiscourseSassCompiler
def self.compile(scss, target, opts={})
self.new(scss, target).compile(opts)
end
# Takes a Sass::SyntaxError and generates css that will show the
# error at the bottom of the page.
def self.error_as_css(sass_error, label)
error = sass_error.sass_backtrace_str(label)
error.gsub!("\n", '\A ')
error.gsub!("'", '\27 ')
"footer { white-space: pre; }
footer:after { content: '#{error}' }"
end
def initialize(scss, target)
@scss = scss
@target = target
end
# Compiles the given scss and output the css as a string.
#
# Options:
# safe: (boolean) if true, theme and plugin stylesheets will not be included. Default is false.
def compile(opts={})
env = Rails.application.assets
# In production Rails.application.assets is a Sprockets::Index
# instead of Sprockets::Environment, there is no cleaner way
# to get the environment from the index.
if env.is_a?(Sprockets::Index)
env = env.instance_variable_get('@environment')
end
context = env.context_class.new(env, "#{@target}.scss", "app/assets/stylesheets/#{@target}.scss")
debug_opts = Rails.env.production? ? {} : {
line_numbers: true,
# debug_info: true, # great with Firebug + FireSass, but not helpful elsewhere
style: :expanded
}
::Sass::Engine.new(@scss, {
syntax: :scss,
cache: false,
read_cache: false,
style: :compressed,
filesystem_importer: opts[:safe] ? DiscourseSafeSassImporter : DiscourseSassImporter,
sprockets: {
context: context,
environment: context.environment
}
}.merge(debug_opts)).render
end
end