OPA conformance (#71)

- Remove unnecessary memory allocations
- Add --non-strict flag
- Ensure that only empty modules (ones without rules) are initialzed prior to evaluating rules.
- Record rule as entry for each of its prefixes.
  For example, for a rule a.b.c =... in package test, record it in
  rules["data.test.a"], rules["data.test.a.b"] and rules["data.test.a.b.c"]

  This allows evaluating the correct list of rules based on expessions
  a.b.c, a.b, a, data.test.a.b.c, data.test.a.b, data.test.a

Closes #69
Closes #70

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>

tests/interpreter/cases/data/tests.yaml

@@ -37,7 +37,7 @@ cases:
         - 100
         - 200
         
-  - note: overriding refs in data produces error
+  - note: overriding refs in data produces no error
     data:
       test:
         rule1: 0
@@ -46,8 +46,8 @@ cases:
         package test
 
         rule1 = 6
-    query: data.test
-    error: value for rule has already been specified
+    query: data.test.rule1
+    want_result: 0
       
   - note: rule named data
     data:

tests/opa.passing

@@ -50,6 +50,9 @@ intersection
 invalidkeyerror
 jsonfilter
 jsonfilteridempotent
+jsonremove
+jsonremoveidempotent
+jsonschema
 jwtencodesignheadererrors
 jwtencodesignpayloaderrors
 negation
@@ -96,5 +99,6 @@ typenamebuiltin
 undos
 union
 units
+uuid
 varreferences
 virtualdocs

tests/opa.rs

@@ -169,7 +169,8 @@ fn run_opa_tests(opa_tests_dir: String, folders: &[String]) -> Result<()> {
                 {
                     entry.0 += 1;
                 }
-                (Err(_), None) if case.want_error.is_some() => {
+                // TODO: Handle tests that specify both want_result and strict_error
+                (Err(_), _) if case.want_error.is_some() => {
                     // Expected failure.
                     entry.0 += 1;
                 }

tests/parser/mod.rs

@@ -27,7 +27,7 @@ fn match_span(s: &Span, v: &Value) -> Result<()> {
     match &v {
         Value::String(vs) => {
             my_assert_eq!(
-                *s.text(),
+                s.text(),
                 vs.as_ref(),
                 "{}",
                 s.source