# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1479940709 -3600
# Node ID c3935cc7b5b6bf6234a98002ce2aa0ef680921e7
# Parent  3a4ba5788f0f5b3507b095e1ea07dbf973439bff
Sketched out the attribute inspection support somewhat.

diff -r 3a4ba5788f0f -r c3935cc7b5b6 lib/__builtins__/attribute.py
--- a/lib/__builtins__/attribute.py	Wed Nov 23 17:32:58 2016 +0100
+++ b/lib/__builtins__/attribute.py	Wed Nov 23 23:38:29 2016 +0100
@@ -3,7 +3,7 @@
 """
 Attribute-related functions.
 
-Copyright (C) 2015 Paul Boddie <paul@boddie.org.uk>
+Copyright (C) 2015, 2016 Paul Boddie <paul@boddie.org.uk>
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -19,22 +19,44 @@
 this program.  If not, see <http://www.gnu.org/licenses/>.
 """
 
-_getattr_default=object() # a unique placeholder for a missing value
+from native import _object_getattr
+
+_default=object() # a unique placeholder for a missing value
+
+def _getattr(obj, name, default=_default):
 
-def getattr(obj, name, default=_getattr_default):
+    """
+    Return for 'obj' the attribute having the given 'name', returning the given
+    'default' if the attribute is not defined for 'obj'.
+    """
 
-    "Implementation of getattr."
+    return _object_getattr(obj, name, default)
+
+def getattr(obj, name, default=_default):
 
-    try:
-        return _getattr(obj, name)
-    except AttributeError:
-        if default is not _getattr_default:
-            return default
+    """
+    Return for 'obj' the attribute having the given 'name', returning the given
+    'default' if the attribute is not defined for 'obj', raising an exception if
+    'default' is not indicated and the attribute is not defined.
+    """
+
+    result = _getattr(obj, name, default)
+
+    if result is _default:
+        if default is _default:
+            raise AttributeError(name)
         else:
-            raise
+            return default
+    else:
+        return result
+
+def hasattr(obj, name):
 
-def hasattr(obj, name): pass
+    "Return whether 'obj' has an attribute called 'name'."
+
+    result = _getattr(obj, name)
+    return result is not _default
+
 def setattr(obj, name, value): pass
-def _getattr(obj, name): pass
 
 # vim: tabstop=4 expandtab shiftwidth=4
diff -r 3a4ba5788f0f -r c3935cc7b5b6 lib/native.py
--- a/lib/native.py	Wed Nov 23 17:32:58 2016 +0100
+++ b/lib/native.py	Wed Nov 23 23:38:29 2016 +0100
@@ -63,6 +63,8 @@
 
 def _buffer_str(self): pass
 
+def _object_getattr(obj, name, default): pass
+
 def _isinstance(obj, cls): pass
 
 def _read(fd, n): pass
diff -r 3a4ba5788f0f -r c3935cc7b5b6 templates/native.c
--- a/templates/native.c	Wed Nov 23 17:32:58 2016 +0100
+++ b/templates/native.c	Wed Nov 23 23:38:29 2016 +0100
@@ -494,6 +494,16 @@
     return __new_str(s);
 }
 
+__attr __fn_native__object_getattr(__attr __args[])
+{
+    __attr * const obj = &__args[1];
+    __attr * const name = &__args[2];
+    __attr * const _default = &__args[3];
+
+    /* NOTE: To be written. */
+    return __builtins___none_None;
+}
+
 __attr __fn_native__isinstance(__attr __args[])
 {
     __attr * const obj = &__args[1];
diff -r 3a4ba5788f0f -r c3935cc7b5b6 templates/native.h
--- a/templates/native.h	Wed Nov 23 17:32:58 2016 +0100
+++ b/templates/native.h	Wed Nov 23 23:38:29 2016 +0100
@@ -52,6 +52,8 @@
 
 __attr __fn_native__buffer_str(__attr __args[]);
 
+__attr __fn_native__object_getattr(__attr __args[]);
+
 __attr __fn_native__isinstance(__attr __args[]);
 
 __attr __fn_native__read(__attr __args[]);