From: Tomas Gavenciak <gavento@matfyz.cz>
Date: Sun, 23 May 2010 14:02:39 +0000 (-0400)
Subject: Changed clause->formula in ConfigCondition, added formula pretty-printing
X-Git-Tag: python-dummy-working~61
X-Git-Url: http://mj.ucw.cz/gitweb/?a=commitdiff_plain;h=5558e9844b447b1f00549bc2997475ffd25b5a5d;p=eval.git

Changed clause->formula in ConfigCondition, added formula pretty-printing
---

diff --git a/t/moe/conf.py b/t/moe/conf.py
index 272ec7b..9942141 100644
--- a/t/moe/conf.py
+++ b/t/moe/conf.py
@@ -118,13 +118,15 @@ class ConfigCondition(ConfigElem):
   ('AND', c1, c1), ('OR', c1, c2), ('NOT', c1), 
   ('==', e1, e2), ('!=', e1, e2) where e1, e2 are `ConfigExpression`s.
   """
-  def __init__(self, text, clause, parent=None):
+  def __init__(self, formula, text=None, parent=None):
     """
-    Condition defined by `text` (informative), `clause` as in class definition, 
+    Condition defined by `text` (informative), `formula` as in class definition, 
     `parent` is the parent condition (if any).
     """
+    if not text:
+      text = self.formula_string(formula)
     super(ConfigVar, self).__init__(text)
-    self.clause = clause
+    self.formula = formula
     self.parent = parent
     # Setup dependencies on used variables (not on the parent condition)
     for v in self.variables():
@@ -132,9 +134,9 @@ class ConfigCondition(ConfigElem):
     if self.parent:
       self.parent.dependants.add(self)
   def variables(self, cl=None):
-    "Return an iterator of variables used in clause `cl`"
+    "Return an iterator of variables used in formula `cl`"
     if not cl: 
-      cl = self.clause
+      cl = self.formula
     if cl[0] in ['==','!=']:
       return itertools.chain(cl[1].variables(), cl[2].variables())
     if cl[0] in ['AND','OR']:
@@ -147,11 +149,11 @@ class ConfigCondition(ConfigElem):
     if self.parent:
       self.parent.dependants.discard(self)
   def evaluate(self, cl=None, depth=0):
-    """Evaluate clause `cl` (or the entire condition).
+    """Evaluate formula `cl` (or the entire condition).
     Partial evaluation for AND and OR. Tests the parent condition first."""
     check_depth(depth)
     if not cl: 
-      cl = self.clause
+      cl = self.formula
     if self.parent and not self.parent.value():
       return False
     if cl[0] in ['==','!=']:
@@ -164,6 +166,17 @@ class ConfigCondition(ConfigElem):
     if cl[0] == 'OR' and v1: return True
     if cl[0] == 'AND' and not v1: return False
     return self.evaluate(cl[2], depth+1)
+  def formula_string(self, formula):
+    "Create a string representation of a formula."
+    if formula[0] == 'AND':
+      return itertools.chain(['('], self.formula_string(formula[1]), [' and '], self.formula_string(formula[2]),[')'])
+    elif formula[0] == 'OR':
+      return itertools.chain(['('], self.formula_string(formula[1]), [' or '], self.formula_string(formula[2]),[')'])
+    elif formula[0] == 'NOT':
+      return itertools.chain(['(not '], self.formula_string(formula[1]),[')'])
+    elif formula[0] in ['==', '!=']:
+      return itertools.chain(formula[1], formula[0], formula[2])
+    return iter(['<invalid formula>'])
   def str(self, parents=False):
     "Retur the defining expression, if `parents` set, then prefixed with parent conditions."
     if parents and self.parent: