Statement Scheduler Implementation

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

tests/interpreter/cases/default/basic.yaml

@@ -349,6 +349,7 @@ cases:
       - |
         package t
         import future.keywords
+        x = true
         default a = [5 | not x]
     query: data.t.a
     want_result: []

tests/interpreter/cases/every/tests.yaml

@@ -26,10 +26,10 @@ cases:
           every key, x in [1, 2, 3] {
             x == key + 1
           }
-          
+
           y = x + key
         }
-        
+
         # Set
         x2 = y {
           # Only value
@@ -48,7 +48,7 @@ cases:
           every key, x in {1, 2, 3} {
             x == key
           }
-          
+
           y = x + key
         }
 
@@ -71,7 +71,7 @@ cases:
           every key, x in {1:2, 3:4} {
             x == key + 1
           }
-          
+
           y = x + key
         }
 
@@ -91,9 +91,11 @@ cases:
           }
           every _ in `abc` {
             undefined_var
-          }  
+          }
           y = 100
         }
+
+        undefined_var { false }
     query: data.test
     want_result:
       x1: 100
@@ -114,10 +116,13 @@ cases:
              false
            }
         }
-    
+
+        p { false }
+
         x2 = y {
            y = 100
            every _ in [1] {
+             # TODO: if p is an undefined var, raise error.
              p
            }
         }
@@ -126,5 +131,3 @@ cases:
 
   #TODO:
   # every vars must be used
-    
-  

tests/interpreter/cases/scheduler/tests.yaml

@@ -0,0 +1,23 @@
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+cases:
+  - note: basic
+    data: {}
+    modules:
+      - |
+        package test
+        import future.keywords
+
+        r1 = value {
+          value = p + a[0] # p and a are defined later
+          q = p            # q depends on p; p depends on q 
+          q = t[0]         # t is defined at end
+          a = [ t[i] |     # a uses a compr which depends on t
+            i := 1
+          ]
+          t = [8, 4]          
+        }
+        
+    query: data.test
+    want_result:
+      r1: 12