Can do logical or.

interpreter.py

@@ -843,6 +843,8 @@ class Interpreter():
             return cur
         elif isinstance(cur, nodes.AndStatement):
             return self.evaluate_andstatement(cur)
+        elif isinstance(cur, nodes.OrStatement):
+            return self.evaluate_orstatement(cur)
         else:
             raise InvalidCode("Unknown statement.")
 
@@ -1247,6 +1249,21 @@ class Interpreter():
             raise InterpreterException('Second argument to "and" is not a boolean.')
         return r
 
+    def evaluate_orstatement(self, cur):
+        l = self.evaluate_statement(cur.left)
+        if isinstance(l, nodes.BoolStatement):
+            l = l.get_value()
+        if not isinstance(l, bool):
+            raise InterpreterException('First argument to "or" is not a boolean.')
+        if l:
+            return True
+        r = self.evaluate_statement(cur.right)
+        if isinstance(r, nodes.BoolStatement):
+            r = r.get_value()
+        if not isinstance(r, bool):
+            raise InterpreterException('Second argument to "or" is not a boolean.')
+        return r
+
     def evaluate_arraystatement(self, cur):
         (arguments, kwargs) = self.reduce_arguments(cur.get_args())
         if len(kwargs) > 0:

mparser.py

@@ -71,7 +71,7 @@ precedence = (
 ('nonassoc', 'EQUALS', 'NEQUALS'),
 ('left', 'OR'),
 ('left', 'AND'),
-('nonassoc', 'COLON')
+('nonassoc', 'COLON'),
 ('left', 'DOT'),
 )
 
@@ -196,6 +196,10 @@ def p_statement_and(t):
     'statement : statement AND statement'
     t[0] = nodes.AndStatement(t[1], t[3])
 
+def p_statement_or(t):
+    'statement : statement OR statement'
+    t[0] = nodes.OrStatement(t[1], t[3])
+
 def p_empty_else(t):
     'elseblock : '
     return None

test cases/common/40 logic ops/meson.build

@@ -27,13 +27,13 @@ else
   error('Not ok.')
 endif
 
-if t and t
+if true and t
   message('Ok.')
 else
   error('Not ok.')
 endif
 
-if t and f
+if t and false
   error('Not ok.')
 else
   message('Ok.')
@@ -44,3 +44,21 @@ if f and t
 else
   message('Ok.')
 endif
+
+if f or false
+  error('Not ok.')
+else
+  message('Ok.')
+endif
+
+if true or f
+  message('Ok.')
+else
+  error('Not ok.')
+endif
+
+if t or true
+  message('Ok.')
+else
+  error('Not ok.')
+endif