Changed 'assoc' to 'prec', because it's precedence.

line.py

@@ -36,7 +36,8 @@ def generate_line(root):
             ('*', '/', 'mod'),
             ('^', )
             ]
-    max_assoc = len(operators)
+
+    max_pred = len(operators)
 
     def is_operator(node):
         """
@@ -47,9 +48,9 @@ def generate_line(root):
 
         return reduce(either, map(lambda x: label in x, operators))
 
-    def assoc(node):
+    def pred(node):
         """
-        Get the associativity of an operator node.
+        Get the precedence of an operator node.
         """
         # Check binary and n-ary operators
         if not isinstance(node, Leaf) and len(node) > 1:
@@ -60,7 +61,7 @@ def generate_line(root):
                     return i
 
         # Unary operator and leaves have highest precedence
-        return max_assoc
+        return max_pred
 
     def traverse(node):
         """
@@ -84,7 +85,7 @@ def generate_line(root):
                 s += traverse(node[0])
             else:
                 # N-ary operator
-                node_assoc = assoc(node)
+                node_pred = pred(node)
                 e = []
 
                 for child in node:
@@ -92,7 +93,7 @@ def generate_line(root):
 
                     # Check if there is an precedence conflict.
                     # If so, add parentheses
-                    if assoc(child) < node_assoc:
+                    if pred(child) < node_pred:
                         exp = '(' + exp + ')'
 
                     e.append(exp)