From 354709fe89a4cb9b26a6c19d377408bab2a07590 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Valim?= <jose.valim@gmail.com>
Date: Tue, 21 Jun 2011 10:58:27 -0300
Subject: Rename AV::Helpers::AssetPaths to AV::AssetPaths to solve autoload
 mess.

---
 actionpack/lib/action_view/asset_paths.rb | 79 +++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 actionpack/lib/action_view/asset_paths.rb

(limited to 'actionpack/lib/action_view/asset_paths.rb')

diff --git a/actionpack/lib/action_view/asset_paths.rb b/actionpack/lib/action_view/asset_paths.rb
new file mode 100644
index 0000000000..2b1fe545a6
--- /dev/null
+++ b/actionpack/lib/action_view/asset_paths.rb
@@ -0,0 +1,79 @@
+require 'active_support/core_ext/file'
+
+module ActionView
+  class AssetPaths #:nodoc:
+    attr_reader :config, :controller
+
+    def initialize(config, controller)
+      @config = config
+      @controller = controller
+    end
+
+    # Add the extension +ext+ if not present. Return full or scheme-relative URLs otherwise untouched.
+    # Prefix with <tt>/dir/</tt> if lacking a leading +/+. Account for relative URL
+    # roots. Rewrite the asset path for cache-busting asset ids. Include
+    # asset host, if configured, with the correct request protocol.
+    def compute_public_path(source, dir, ext = nil, include_host = true)
+      source = source.to_s
+      return source if is_uri?(source)
+
+      source = rewrite_extension(source, dir, ext) if ext
+      source = rewrite_asset_path(source, dir)
+
+      if controller && include_host
+        has_request = controller.respond_to?(:request)
+        source = rewrite_host_and_protocol(source, has_request)
+      end
+
+      source
+    end
+
+    def is_uri?(path)
+      path =~ %r{^[-a-z]+://|^cid:|^//}
+    end
+
+  private
+
+    def rewrite_extension(source, dir, ext)
+      raise NotImplementedError
+    end
+
+    def rewrite_asset_path(source, path = nil)
+      raise NotImplementedError
+    end
+
+    def rewrite_relative_url_root(source, relative_url_root)
+      relative_url_root && !source.starts_with?("#{relative_url_root}/") ? "#{relative_url_root}#{source}" : source
+    end
+
+    def rewrite_host_and_protocol(source, has_request)
+      source = rewrite_relative_url_root(source, controller.config.relative_url_root) if has_request
+      host = compute_asset_host(source)
+      if has_request && host && !is_uri?(host)
+        host = "#{controller.request.protocol}#{host}"
+      end
+      "#{host}#{source}"
+    end
+
+    # Pick an asset host for this source. Returns +nil+ if no host is set,
+    # the host if no wildcard is set, the host interpolated with the
+    # numbers 0-3 if it contains <tt>%d</tt> (the number is the source hash mod 4),
+    # or the value returned from invoking call on an object responding to call
+    # (proc or otherwise).
+    def compute_asset_host(source)
+      if host = config.asset_host
+        if host.respond_to?(:call)
+          case host.is_a?(Proc) ? host.arity : host.method(:call).arity
+          when 2
+            request = controller.respond_to?(:request) && controller.request
+            host.call(source, request)
+          else
+            host.call(source)
+          end
+        else
+          (host =~ /%d/) ? host % (source.hash % 4) : host
+        end
+      end
+    end
+  end
+end
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