dev (#81)

Co-authored-by: mikolaj widla <mikolaj.widla@gmail.com>
Co-authored-by: Adam Bem <adam.bem@zoho.eu>
Reviewed-on: R11/release11-tools-web#81

Backend-libXML/Parser.py

@@ -2,10 +2,27 @@ from lxml import etree
 
 
 def prettify(source: str) -> str:
+    """Method used to pretty format given XML
+
+    :param source: XML
+    :return: prettified XML
+    """
+    prolog = ""
+    prolog_start = source.find("<?")
+    
+    if prolog_start != -1:
+        prolog_end = source.find("?>") + 2
+        prolog = source[prolog_start:prolog_end] + "\n"
+        source = source[prolog_end: ]
     xml = etree.XML(source)
-    return etree.tostring(xml, pretty_print=True).decode()
+    return prolog + etree.tostring(xml, pretty_print=True).decode()
 
 def minimize(source: str) -> str:
+    """Method used to minimize XML by deleting not needed whitespaces.
+
+    :param source: XML
+    :return: minimized XML
+    """
     result = source
     
     to_remove = ["   ", "  ", "\t", "\n"]