add py_value to selected classes in python bindings, add mode for input-assertion based lookahead solving

src/api/api_parsers.cpp

@@ -263,7 +263,7 @@ extern "C" {
             if (ous.str().empty()) ous << e.what();
             SET_ERROR_CODE(Z3_PARSER_ERROR, ous.str());
         }
-        Z3_CATCH_CORE();
+        Z3_CATCH_CORE({});
         RETURN_Z3(mk_c(c)->mk_external_string(std::move(ous).str()));
     }
 }

src/api/python/z3/z3.py

@@ -447,6 +447,10 @@ class AstRef(Z3PPObject):
         """
         return Z3_get_ast_hash(self.ctx_ref(), self.as_ast())
 
+    def py_value(self):
+        """Return a Python value that is equivalent to `self`."""
+        return None
+
 
 def is_ast(a):
     """Return `True` if `a` is an AST node.
@@ -1611,6 +1615,13 @@ class BoolRef(ExprRef):
     
     def __invert__(self):
         return Not(self)
+
+    def py_value(self):
+        if is_true(self):
+            return True
+        if is_false(self):
+            return False
+        return None
     
     
 
@@ -3045,6 +3056,9 @@ class IntNumRef(ArithRef):
         """
         return Z3_get_numeral_binary_string(self.ctx_ref(), self.as_ast())
 
+    def py_value(self):
+        return Z3_get_numeral_double(self.ctx_ref(), self.as_ast())
+
 
 class RatNumRef(ArithRef):
     """Rational values."""
@@ -3142,6 +3156,9 @@ class RatNumRef(ArithRef):
         """
         return Fraction(self.numerator_as_long(), self.denominator_as_long())
 
+    def py_value(self):
+        return Z3_get_numeral_double(self.ctx_ref(), self.as_ast())
+
 
 class AlgebraicNumRef(ArithRef):
     """Algebraic irrational values."""
@@ -11005,6 +11022,9 @@ class SeqRef(ExprRef):
             return string_at(chars, size=string_length.value).decode("latin-1")
         return Z3_ast_to_string(self.ctx_ref(), self.as_ast())
 
+    def py_value(self):
+        return self.as_string()
+
     def __le__(self, other):
         return _to_expr_ref(Z3_mk_str_le(self.ctx_ref(), self.as_ast(), other.as_ast()), self.ctx)