add special cases for Mars Odyssey ancillary experimenter notebook products

Author: curtiss9

pdr/formats/checkers.py

@@ -318,6 +318,13 @@ def check_special_table_reader(
         and name == "TABLE"
     ):
         return True, formats.lp.ancillary_table_loader(fn, fmtdef_dt)
+    if (
+        identifiers["DATA_SET_ID"] == "ODY-M-GRS-2-EDR-V1.0"
+        and identifiers["PRODUCT_TYPE"] == "E_KERNEL"
+        and ".txt" in fn.lower()
+    ):
+        return formats.odyssey.grs_e_kernel_loader(name, fn)
+    
     return False, None
 
 
@@ -501,6 +508,12 @@ def check_special_structure(
         return formats.galileo.ssi_redr_structure(
             block, name, fn, data, identifiers
         )
+    if (
+        identifiers["DATA_SET_ID"] == "ODY-M-GRS-2-EDR-V1.0"
+        and identifiers["PRODUCT_TYPE"] == "E_KERNEL"
+        and ".txt" in fn.lower()
+    ):
+        return formats.odyssey.grs_e_kernel_structure()
     return False, None
 
 

pdr/formats/odyssey.py

@@ -14,3 +14,34 @@ def map_table_loader(filename, fmtdef_dt):
     assert len(table.columns) == len(names), "Mismatched column count"
     table.columns = names
     return table
+
+def grs_e_kernel_loader(name, fn):
+    """
+    The GRS Experimenter's Notebook products have two "FILE" objects with one 
+    "TIME_SERIES" pointer each. The first object/pointer is for the time series 
+    table, the other is for a .TXT notes file. Because the text file's pointer 
+    has "SERIES" in it, pointer_to_loader() sends it to ReadTable(). 
+
+    This special case reads it with read_text() instead.
+
+    HITS
+    * mars_odyssey
+        * edr_e_kernel
+    """
+    from pdr.loaders.text import read_text
+
+    return True, read_text(name, fn)
+
+def grs_e_kernel_structure():
+    """
+    Handles the same files as grs_e_kernel_loader() above, and is needed to 
+    avoid an error thrown before that special case can be called. Because the 
+    second TIME_SERIES pointer is not actually a table, parse_table_structure() 
+    fails when trying to make a fmtdef.
+
+    HITS
+    * mars_odyssey
+        * edr_e_kernel
+    """
+    return True, None
+