Fix parsing priority issue with NULL/TRUE/FALSE. Remove deprecated Python builds.

Author: davidmezzetti

.github/workflows/python-package.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9, '3.10', '3.11']
+        python-version: [3.9, '3.10', '3.11']
 
     steps:
     - uses: actions/checkout@v2

grandcypher/__init__.py

@@ -68,9 +68,9 @@
 
 ?entity_id_or_value : entity_id
                     | value
-                    | "NULL"i -> null
-                    | "TRUE"i -> true
-                    | "FALSE"i -> false
+                    | NULL -> null
+                    | TRUE -> true
+                    | FALSE -> false
 
 op                  : "==" -> op_eq
                     | "=" -> op_eq
@@ -149,9 +149,13 @@
 key                 : CNAME
 ?value              : ESTRING
                     | NUMBER
-                    | "NULL"i -> null
-                    | "TRUE"i -> true
-                    | "FALSE"i -> false
+                    | NULL -> null
+                    | TRUE -> true
+                    | FALSE -> false
+
+NULL.1                : "NULL"i
+TRUE.1                : "TRUE"i
+FALSE.1               : "FALSE"i
 
 
 %import common.CNAME            -> CNAME