X-Git-Url: https://code.kerkeslager.com/?p=fur;a=blobdiff_plain;f=normalization.py;h=f2b7b138a6a8dbe9db3ce5cad5e8c5b280b454cb;hp=2fa57fc5365cb3c864fde0f91d9536c1c848b750;hb=61733d6070859e6a639ae4b34faec9aacca52a29;hpb=8d6f07b43d8b41473fb7d8779bbc7a5843adcd7b

diff --git a/normalization.py b/normalization.py
index 2fa57fc..f2b7b13 100644
--- a/normalization.py
+++ b/normalization.py
@@ -49,10 +49,9 @@ NormalDotExpression = collections.namedtuple(
 NormalInfixExpression = collections.namedtuple(
     'NormalInfixExpression',
     [
+        'metadata',
         'order',
         'operator',
-        'left',
-        'right',
     ],
 )
 
@@ -398,29 +397,18 @@ def normalize_basic_infix_operation(counter, expression):
     counter, left_prestatements, left_expression = normalize_expression(counter, expression.left)
     counter, right_prestatements, right_expression = normalize_expression(counter, expression.right)
 
-    left_variable = '${}'.format(counter)
-    counter += 1
-    right_variable = '${}'.format(counter)
-    counter += 1
     center_variable = '${}'.format(counter)
     counter += 1
 
     root_prestatements = (
-        NormalVariableInitializationStatement(
-            variable=left_variable,
-            expression=left_expression,
-        ),
-        NormalVariableInitializationStatement(
-            variable=right_variable,
-            expression=right_expression,
-        ),
+        NormalPushStatement(expression=left_expression),
+        NormalPushStatement(expression=right_expression),
         NormalVariableInitializationStatement(
             variable=center_variable,
             expression=NormalInfixExpression(
+                metadata=expression.metadata,
                 order=expression.order,
                 operator=expression.operator,
-                left=NormalVariableExpression(variable=left_variable),
-                right=NormalVariableExpression(variable=right_variable),
             ),
         ),
     )
@@ -431,67 +419,61 @@ def normalize_basic_infix_operation(counter, expression):
         NormalVariableExpression(variable=center_variable),
     )
 
-def normalize_comparison_expression(counter, expression):
-    stack = []
-
-    while isinstance(expression.left, parsing.FurInfixExpression) and expression.order == 'comparison_level':
-        stack.append((expression.operator, expression.order, expression.right))
-        expression = expression.left
-
-    counter, left_prestatements, left_expression = normalize_expression(counter, expression.left)
-    counter, right_prestatements, right_expression = normalize_expression(counter, expression.right)
+def desugar_ternary_comparison(counter, expression):
+    counter, left_prestatements, left_expression = normalize_expression(counter, expression.left.left)
+    counter, middle_prestatements, middle_expression = normalize_expression(counter, expression.left.right)
 
     left_variable = '${}'.format(counter)
     counter += 1
-    right_variable = '${}'.format(counter)
+    middle_variable = '${}'.format(counter)
     counter += 1
 
-    root_prestatements = (
+    # TODO Is there a memory leak if the middle expression throws an exception because the first expression result hasn't been added to the stack?
+    juncture_prestatements = (
         NormalVariableInitializationStatement(
             variable=left_variable,
             expression=left_expression,
         ),
         NormalVariableInitializationStatement(
-            variable=right_variable,
-            expression=right_expression,
-        ),
+            variable=middle_variable,
+            expression=middle_expression,
+        )
     )
 
-    counter, result_prestatements, result_expression = (
+    counter, boolean_expression_prestatements, boolean_expression =  normalize_boolean_expression(
         counter,
-        left_prestatements + right_prestatements + root_prestatements,
-        NormalInfixExpression(
-            order=expression.order,
-            operator=expression.operator,
-            left=NormalVariableExpression(variable=left_variable),
-            right=NormalVariableExpression(variable=right_variable),
-        ),
-    )
-
-    while len(stack) > 0:
-        right_operator, right_order, right_expression = stack.pop()
-        and_right_expression = parsing.FurInfixExpression(
-            operator=right_operator,
-            order=right_order,
-            left=NormalVariableExpression(variable=right_variable),
-            right=right_expression,
-        )
-
-        and_expression = parsing.FurInfixExpression(
-            operator='and',
+        parsing.FurInfixExpression(
+            metadata=expression.left.metadata,
             order='and_level',
-            left=result_expression,
-            right=and_right_expression,
+            operator='and',
+            left=parsing.FurInfixExpression(
+                metadata=expression.left.metadata,
+                order='comparison_level',
+                operator=expression.left.operator,
+                left=NormalVariableExpression(variable=left_variable),
+                right=NormalVariableExpression(variable=middle_variable),
+            ),
+            right=parsing.FurInfixExpression(
+                metadata=expression.metadata,
+                order='comparison_level',
+                operator=expression.operator,
+                left=NormalVariableExpression(variable=middle_variable),
+                right=expression.right,
+            ),
         )
+    )
 
-        counter, and_prestatements, result_expression = normalize_boolean_expression(
-            counter,
-            and_expression,
-        )
+    return (
+        counter,
+        left_prestatements + middle_prestatements + juncture_prestatements + boolean_expression_prestatements,
+        boolean_expression,
+    )
 
-        result_prestatements = result_prestatements + and_prestatements
+def normalize_comparison_expression(counter, expression):
+    if isinstance(expression.left, parsing.FurInfixExpression) and expression.order == 'comparison_level':
+        return desugar_ternary_comparison(counter, expression)
 
-    return (counter, result_prestatements, result_expression)
+    return normalize_basic_infix_operation(counter, expression)
 
 def normalize_boolean_expression(counter, expression):
     counter, left_prestatements, left_expression = normalize_expression(counter, expression.left)