code: def analyze(
          self, trees: List[ET.ElementTree], comments: OrderedDict
      ) -> Dict:
          outputDict = {}
          ast = []
  
          # Parse through the ast once to identify and grab all the functions
          # present in the Fortran file.
          for tree in trees:
              self.loadFunction(tree)
  
          # Parse through the ast tree a second time to convert the XML ast
          # format to a format that can be used to generate Python statements.
          for tree in trees:
              ast += self.parseTree(tree, ParseState())
  
          
          if self.entryPoint:
              entry = {"program": self.entryPoint[0]}
          else:
              entry = {}
              if self.functionList:
                  entry["function"] = self.functionList
              if self.subroutineList:
                  entry["subroutine"] = self.subroutineList
  
          # Load the functions list and Fortran ast to a single data structure
          # which can be pickled and hence is portable across various scripts and
          # usages.
          outputDict["ast"] = ast
          outputDict["functionList"] = self.functionList
          outputDict["comments"] = comments
          return outputDict
docs: Find the entry point for the Fortran file.
          The entry point for a conventional Fortran file is always the PROGRAM
          section. This 'if' statement checks for the presence of a PROGRAM
          segment.
  
          If not found, the entry point can be any of the functions or
          subroutines in the file. So, all the functions and subroutines of the
          program are listed and included as the possible entry point.