Temporary revert Processor changes

lib/autoprefixer-rails/processor.rb

@@ -7,6 +7,19 @@
 IS_SECTION = /^\s*\[(.+)\]\s*$/.freeze
 
 module AutoprefixerRails
+  def self.show_deprecation_message!
+    return unless defined?(ActiveSupport::Deprecation)
+
+    return if defined?(@deprecation_shown)
+
+    ActiveSupport::Deprecation.warn(
+      "autoprefixer-rails was deprected. Migration guide:\n" \
+      "https://github.com/ai/autoprefixer-rails/wiki/Deprecated"
+    )
+
+    @deprecation_shown = true
+  end
+
   # Ruby to JS wrapper for Autoprefixer processor instance
   class Processor
     def initialize(params = {})
@@ -20,8 +33,15 @@ def initialize(params = {})
     # * `to` with output CSS file name.
     # * `map` with true to generate new source map or with previous map.
     def process(css, opts = {})
+      AutoprefixerRails.show_deprecation_message!
+
       opts = convert_options(opts)
 
+      apply_wrapper =
+        "(function(opts, pluginOpts) {" \
+        "return eval(process.apply(this, opts, pluginOpts));" \
+        "})"
+
       plugin_opts = params_with_browsers(opts[:from]).merge(opts)
       process_opts = {
         from: plugin_opts.delete(:from),
@@ -30,10 +50,10 @@ def process(css, opts = {})
       }
 
       begin
-        result = runtime.call("autoprefixer.process", css, process_opts, plugin_opts)
+        result = runtime.call(apply_wrapper, [css, process_opts, plugin_opts])
       rescue ExecJS::ProgramError => e
         contry_error = "BrowserslistError: " \
-          "Country statistics are not supported " \
+          "Country statistics is not supported " \
           "in client-side build of Browserslist"
         if e.message == contry_error
           raise "Country statistics is not supported in AutoprefixerRails. " \
@@ -48,7 +68,7 @@ def process(css, opts = {})
 
     # Return, which browsers and prefixes will be used
     def info
-      runtime.call("autoprefixer.info", params_with_browsers)
+      runtime.eval("autoprefixer(#{js_params}).info()")
     end
 
     # Parse Browserslist config
@@ -93,6 +113,13 @@ def params_with_browsers(from = nil)
       params
     end
 
+    # Convert params to JS string and add browsers from Browserslist config
+    def js_params
+      "{ " +
+        params_with_browsers.map { |k, v| "#{k}: #{v.inspect}" }.join(", ") +
+        " }"
+    end
+
     # Convert ruby_options to jsOptions
     def convert_options(opts)
       converted = {}
@@ -149,10 +176,34 @@ def runtime
       end
     end
 
+    # Cache autoprefixer.js content
+    def read_js
+      @read_js ||= begin
+        root = Pathname(File.dirname(__FILE__))
+        path = root.join("../../vendor/autoprefixer.js")
+        path.read
+      end
+    end
+
+    # Return processor JS with some extra methods
     def build_js
-      root = Pathname(File.dirname(__FILE__))
-      path = root.join("../../vendor/autoprefixer.js")
-      path.read
+      "var global = this;" + read_js + process_proxy
+    end
+
+    # Return JS code for process method proxy
+    def process_proxy
+      <<-JS
+        var processor;
+        var process = function() {
+          var result = autoprefixer.process.apply(autoprefixer, arguments);
+          var warns  = result.warnings().map(function (i) {
+            delete i.plugin;
+            return i.toString();
+          });
+          var map = result.map ? result.map.toString() : null;
+          return { css: result.css, map: map, warnings: warns };
+        };
+      JS
     end
   end
 end