Ora2pg - migration Oracle db into postgreSQL without instalation of Oracle
DOCUMENTATION

You can use -i:

-i | --input file : File containing Oracle PL/SQL code to convert with
                    no Oracle database connection initiated.


Or set INPUT_FILE in ora2pg.conf:


  INPUT_FILE 
  
  This directive did not control the Oracle database
  connection or unless it purely disable the use of any Oracle database
  by accepting a file as argument. Set this directive to a file
  containing PL/SQL Oracle Code like function, procedure or full package
  body to prevent Ora2Pg from connecting to an Oracle database and just
  apply his convertion tool to the content of the file. This can be used
  with the most of export types: TABLE, TRIGGER, PROCEDURE, VIEW,
  FUNCTION or PACKAGE, etc.


I did not test this though.