1 files changed, 81 insertions, 0 deletions
diff --git a/actionview/lib/action_view/template/handlers/erb/erubis.rb b/actionview/lib/action_view/template/handlers/erb/erubis.rb
new file mode 100644
index 0000000000..f3c35e1aec
--- /dev/null
+++ b/actionview/lib/action_view/template/handlers/erb/erubis.rb
@@ -0,0 +1,81 @@
+gem "erubis"
+require "erubis"
+
+module ActionView
+  class Template
+    module Handlers
+      class ERB
+        class Erubis < ::Erubis::Eruby
+          # :nodoc: all
+          def add_preamble(src)
+            @newline_pending = 0
+            src << "@output_buffer = output_buffer || ActionView::OutputBuffer.new;"
+          end
+
+          def add_text(src, text)
+            return if text.empty?
+
+            if text == "\n"
+              @newline_pending += 1
+            else
+              src << "@output_buffer.safe_append='"
+              src << "\n" * @newline_pending if @newline_pending > 0
+              src << escape_text(text)
+              src << "'.freeze;"
+
+              @newline_pending = 0
+            end
+          end
+
+          # Erubis toggles <%= and <%== behavior when escaping is enabled.
+          # We override to always treat <%== as escaped.
+          def add_expr(src, code, indicator)
+            case indicator
+            when "=="
+              add_expr_escaped(src, code)
+            else
+              super
+            end
+          end
+
+          BLOCK_EXPR = /\s*((\s+|\))do|\{)(\s*\|[^|]*\|)?\s*\Z/
+
+          def add_expr_literal(src, code)
+            flush_newline_if_pending(src)
+            if BLOCK_EXPR.match?(code)
+              src << "@output_buffer.append= " << code
+            else
+              src << "@output_buffer.append=(" << code << ");"
+            end
+          end
+
+          def add_expr_escaped(src, code)
+            flush_newline_if_pending(src)
+            if BLOCK_EXPR.match?(code)
+              src << "@output_buffer.safe_expr_append= " << code
+            else
+              src << "@output_buffer.safe_expr_append=(" << code << ");"
+            end
+          end
+
+          def add_stmt(src, code)
+            flush_newline_if_pending(src)
+            super
+          end
+
+          def add_postamble(src)
+            flush_newline_if_pending(src)
+            src << "@output_buffer.to_s"
+          end
+
+          def flush_newline_if_pending(src)
+            if @newline_pending > 0
+              src << "@output_buffer.safe_append='#{"\n" * @newline_pending}'.freeze;"
+              @newline_pending = 0
+            end
+          end
+        end
+      end
+    end
+  end
+end