transferred Code Ocean from original repository to GitHub

lib/whistleblower.rb

@@ -0,0 +1,20 @@
+class Whistleblower
+  PLACEHOLDER_REGEXP = /\$(\d)/
+
+  def find_hint(stderr)
+    Hint.where(execution_environment_id: @execution_environment.id).detect do |hint|
+      @matches = Regexp.new(hint.regular_expression).match(stderr)
+    end
+  end
+  private :find_hint
+
+  def generate_hint(stderr)
+    if hint = find_hint(stderr)
+      hint.message.gsub(PLACEHOLDER_REGEXP) { @matches[$1.to_i] }
+    end
+  end
+
+  def initialize(options = {})
+    @execution_environment = options[:execution_environment]
+  end
+end