Merge pull request #41 from leoselig/master

Import exercise meta data from CodeHarbour

app/models/exercise.rb

@@ -1,3 +1,4 @@
+require 'nokogiri'
 require File.expand_path('../../../lib/active_model/validations/boolean_presence_validator', __FILE__)
 
 class Exercise < ActiveRecord::Base
@@ -109,6 +110,54 @@ class Exercise < ActiveRecord::Base
     exercise
   end
 
+  def determine_file_role_from_proforma_file(task_node, file_node)
+    file_id = file_node.xpath('@id')
+    file_class = file_node.xpath('@class').first.value
+    comment = file_node.xpath('@comment').first.value
+    is_referenced_by_test = task_node.xpath("p:tests/p:test/p:filerefs/p:fileref[@id=#{file_id}]")
+    is_referenced_by_model_solution = task_node.xpath("p:model-solutions/p:model-solution/p:filerefs/p:fileref[@id=#{file_id}]")
+    if is_referenced_by_test && (file_class == 'internal')
+      return 'teacher_defined_test'
+    elsif is_referenced_by_model_solution && (file_class == 'internal')
+      return 'reference_implementation'
+    elsif (file_class == 'template') && (comment == 'main')
+      return 'main_file'
+    elsif (file_class == 'internal') && (comment == 'main')
+    end
+    return 'regular_file'
+  end
+
+  def from_proforma_xml(xml_string)
+    # how to extract the proforma functionality into a different module in rails?
+    xml = Nokogiri::XML(xml_string)
+    xml.collect_namespaces
+    task_node = xml.xpath('/root/p:task')
+    description = task_node.xpath('p:description/text()')[0].content
+    self.attributes = {
+      title: task_node.xpath('p:meta-data/p:title/text()')[0].content,
+      description: description,
+      instructions: description
+    }
+    task_node.xpath('p:files/p:file').all? { |file|
+      file_name_split = file.xpath('@filename').first.value.split('.')
+      file_class = file.xpath('@class').first.value
+      role = determine_file_role_from_proforma_file(task_node, file)
+      feedback_message_nodes = task_node.xpath("p:tests/p:test/p:test-configuration/c:feedback-message/text()")
+      files.build({
+        name: file_name_split.first,
+        content: file.xpath('text()').first.content,
+        read_only: false,
+        hidden: file_class == 'internal',
+        role: role,
+        feedback_message: (role == 'teacher_defined_test') ? feedback_message_nodes.first.content : nil,
+        file_type: FileType.where(
+          file_extension: ".#{file_name_split.second}"
+        ).take
+      })
+    }
+    self.execution_environment_id = 1
+  end
+
   def generate_token
     self.token ||= SecureRandom.hex(4)
   end
@@ -133,4 +182,5 @@ class Exercise < ActiveRecord::Base
     end
   end
   private :valid_main_file?
+
 end