discourse/lib/sass/discourse_sass_compiler.rb

83 lines
2.2 KiB
Ruby

require_dependency 'sass/discourse_sass_importer'
require 'pathname'
module Sass::Script::Functions
def _error(message)
raise Sass::SyntaxError, mesage
end
end
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
unless Sass::Script::Functions < Sprockets::SassFunctions
Sass::Script::Functions.send :include, Sprockets::SassFunctions
end
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
pathname = Pathname.new("app/assets/stylesheets/#{@target}.scss")
context = env.context_class.new(env, "#{@target}.scss", pathname)
debug_opts = Rails.env.production? ? {} : {
line_numbers: true,
# debug_info: true, # great with Firebug + FireSass, but not helpful elsewhere
style: :expanded
}
css = ::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
css_output = css
if opts[:rtl]
begin
require 'r2'
css_output = R2.r2(css) if defined?(R2)
rescue; end
end
css_output
end
end