Added option to search over incomplete trees. Also added some validations.

app.py

@@ -311,6 +311,8 @@ def create_app():
     @app.route('/stark/', methods=['GET', 'POST'])
     # @headers({'Cache-Control': 'no-store, no-cache, must-revalidate, post-check=0, pre-check=0'})
     def index():
+        # TODO - SIZE REGEX:
+        # TODO - MAX IF COMPLETE = 4/5
         translations = _translations[get_locale()]
         if request.method == 'POST':
             form = request.form
@@ -319,7 +321,6 @@ def create_app():
                 'input_path': '',
                 'tree_size': '1-1000000',
                 'display_size': '1-1000000',
-                'complete_tree_type': True,
                 'ignored_labels': []
             }
             # mandatory parameters
@@ -352,7 +353,19 @@ def create_app():
                 validation['file'] = gettext('Please insert either input url or provide a file.')
                 validation['input_url'] = gettext('Please insert either input url or provide a file.')
 
+            configs['complete_tree_type'] = 'complete_trees' in form and form['complete_trees'] == 'on'
+
             if 'display_size' in form and form['display_size']:
+                if re.match(r'(^\d+$)|(^\d+-\d+$)', form['display_size']) is None:
+                    validation['display_size'] = gettext('Please insert an integer number or a range separated with `-`, without spaces. Example: 3 or 2-4.')
+                else:
+                    if not configs['complete_tree_type']:
+                        max_display_size = int(form['display_size'].split('-')[-1])
+                        if max_display_size >= 5:
+                            validation['display_size'] = gettext(
+                                'Please set a maximum display size to a number equal or lower to 4, when extracting Incomplete trees. Or search through complete trees (Complete trees parameter).')
+                        configs['tree_size'] = "1-6"
+
                 configs['display_size'] = form['display_size']
 
             def validate_node_type(node_type):