Add support for multi argument ands and ors, and the same precedence with

left to right grouping

Bug: 905740
Change-Id: I6a0b971556ab66bec841004fbbe8760b9136f216
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1793775Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Anthony Polito <apolito@google.com>

gclient_eval.py

@@ -568,33 +568,23 @@ def EvaluateCondition(condition, variables, referenced_variables=None):
         node, ast.NameConstant):  # Since Python 3.4
       return node.value
     elif isinstance(node, ast.BoolOp) and isinstance(node.op, ast.Or):
-      if len(node.values) != 2:
-        raise ValueError(
-            'invalid "or": exactly 2 operands required (inside %r)' % (
-                condition))
-      left = _convert(node.values[0])
-      right = _convert(node.values[1])
-      if not isinstance(left, bool):
-        raise ValueError(
-            'invalid "or" operand %r (inside %r)' % (left, condition))
-      if not isinstance(right, bool):
-        raise ValueError(
-            'invalid "or" operand %r (inside %r)' % (right, condition))
-      return left or right
+      bool_values = []
+      for value in node.values:
+        bool_values.append(_convert(value))
+        if not isinstance(bool_values[-1], bool):
+          raise ValueError(
+              'invalid "or" operand %r (inside %r)' % (
+                  bool_values[-1], condition))
+      return any(bool_values)
     elif isinstance(node, ast.BoolOp) and isinstance(node.op, ast.And):
-      if len(node.values) != 2:
-        raise ValueError(
-            'invalid "and": exactly 2 operands required (inside %r)' % (
-                condition))
-      left = _convert(node.values[0])
-      right = _convert(node.values[1])
-      if not isinstance(left, bool):
-        raise ValueError(
-            'invalid "and" operand %r (inside %r)' % (left, condition))
-      if not isinstance(right, bool):
-        raise ValueError(
-            'invalid "and" operand %r (inside %r)' % (right, condition))
-      return left and right
+      bool_values = []
+      for value in node.values:
+        bool_values.append(_convert(value))
+        if not isinstance(bool_values[-1], bool):
+          raise ValueError(
+              'invalid "and" operand %r (inside %r)' % (
+                  bool_values[-1], condition))
+      return all(bool_values)
     elif isinstance(node, ast.UnaryOp) and isinstance(node.op, ast.Not):
       value = _convert(node.operand)
       if not isinstance(value, bool):

tests/gclient_eval_unittest.py

@@ -250,6 +250,26 @@ class EvaluateConditionTest(unittest.TestCase):
     self.assertFalse(gclient_eval.EvaluateCondition(
         'foo != "baz"', {'foo': '"baz"'}))
 
+  def test_triple_or(self):
+    self.assertTrue(gclient_eval.EvaluateCondition(
+        'a or b or c', {'a': 'False', 'b': 'False', 'c': 'True'}))
+    self.assertFalse(gclient_eval.EvaluateCondition(
+        'a or b or c', {'a': 'False', 'b': 'False', 'c': 'False'}))
+
+  def test_triple_and(self):
+    self.assertTrue(gclient_eval.EvaluateCondition(
+        'a and b and c', {'a': 'True', 'b': 'True', 'c': 'True'}))
+    self.assertFalse(gclient_eval.EvaluateCondition(
+        'a and b and c', {'a': 'True', 'b': 'True', 'c': 'False'}))
+
+  def test_triple_and_and_or(self):
+    self.assertTrue(gclient_eval.EvaluateCondition(
+        'a and b and c or d or e',
+        {'a': 'False', 'b': 'False', 'c': 'False', 'd': 'False', 'e': 'True'}))
+    self.assertFalse(gclient_eval.EvaluateCondition(
+        'a and b and c or d or e',
+        {'a': 'True', 'b': 'True', 'c': 'False', 'd': 'False', 'e': 'False'}))
+
   def test_string_bool(self):
     self.assertFalse(gclient_eval.EvaluateCondition(
         'false_str_var and true_var',
@@ -265,6 +285,26 @@ class EvaluateConditionTest(unittest.TestCase):
             '(inside \'false_var_str and true_var\')',
         str(cm.exception))
 
+  def test_non_bool_in_or(self):
+    with self.assertRaises(ValueError) as cm:
+      gclient_eval.EvaluateCondition(
+          'string_var or true_var',
+          {'string_var': 'Kittens', 'true_var': True})
+    self.assertIn(
+        'invalid "or" operand \'Kittens\' '
+            '(inside \'string_var or true_var\')',
+        str(cm.exception))
+
+  def test_non_bool_in_and(self):
+    with self.assertRaises(ValueError) as cm:
+      gclient_eval.EvaluateCondition(
+          'string_var and true_var',
+          {'string_var': 'Kittens', 'true_var': True})
+    self.assertIn(
+        'invalid "and" operand \'Kittens\' '
+            '(inside \'string_var and true_var\')',
+        str(cm.exception))
+
   def test_tuple_presence(self):
     self.assertTrue(gclient_eval.EvaluateCondition(
       'foo in ("bar", "baz")', {'foo': 'bar'}))