Fixed some index bugs.

diff --git a/didex/index.py b/didex/index.py
index 2844de0..951eb3f 100644 (file)
--- a/didex/index.py
+++ b/didex/index.py
@@ -162,7 +162,7 @@ class ordered(index, lib.closable):
         @dloopfun
         def first(self):
             try:
-                if self.fd is None:
+                if self.fd is missing:
                     self.item = self._decode(self.cur.first())
                 else:
                     k, v = self._decode(self.cur.set_range(self.typ.encode(self.fd)))
@@ -176,16 +176,20 @@ class ordered(index, lib.closable):
         @dloopfun
         def last(self):
             try:
-                if self.fd is None:
+                if self.ld is missing:
                     self.item = self._decode(self.cur.last())
                 else:
-                    k, v = self._decode(self.cur.set_range(self.typ.encode(self.ld)))
-                    if self.fi:
-                        while self.typ.compare(k, self.fd) == 0:
+                    try:
+                        k, v = self._decode(self.cur.set_range(self.typ.encode(self.ld)))
+                    except notfound:
+                        k, v = self._decode(self.cur.last())
+                    if self.li:
+                        while self.typ.compare(k, self.ld) == 0:
                             k, v = self._decode(self.cur.next())
-                        k, v = self._decode(self.cur.prev())
+                        while self.typ.compare(k, self.ld) > 0:
+                            k, v = self._decode(self.cur.prev())
                     else:
-                        while self.typ.compare(k, self.fd) >= 0:
+                        while self.typ.compare(k, self.ld) >= 0:
                             k, v = self._decode(self.cur.prev())
                     self.item = k, v
             except notfound:
@@ -195,8 +199,9 @@ class ordered(index, lib.closable):
         def next(self):
             try:
                 k, v = self.item = self._decode(self.cur.next())
-                if ((self.li and self.typ.compare(k, self.ld) > 0) or
-                    (not self.li and self.typ.compare(k, self.ld) >= 0)):
+                if (self.ld is not missing and
+                    ((self.li and self.typ.compare(k, self.ld) > 0) or
+                     (not self.li and self.typ.compare(k, self.ld) >= 0))):
                     self.item = StopIteration
             except notfound:
                 self.item = StopIteration
@@ -205,8 +210,9 @@ class ordered(index, lib.closable):
         def prev(self):
             try:
                 self.item = self._decode(self.cur.prev())
-                if ((self.fi and self.typ.compare(k, self.fd) < 0) or
-                    (not self.fi and self.typ.compare(k, self.fd) <= 0)):
+                if (self.fd is not missing and
+                    ((self.fi and self.typ.compare(k, self.fd) < 0) or
+                     (not self.fi and self.typ.compare(k, self.fd) <= 0))):
                     self.item = StopIteration
             except notfound:
                 self.item = StopIteration
@@ -231,7 +237,7 @@ class ordered(index, lib.closable):
 
     def get(self, *, match=missing, ge=missing, gt=missing, lt=missing, le=missing, all=False, reverse=False):
         if all:
-            cur = self.cursor(self, None, True, None, True, reverse)
+            cur = self.cursor(self, missing, True, missing, True, reverse)
         elif match is not missing:
             cur = self.cursor(self, match, True, match, True, reverse)
         elif ge is not missing or gt is not missing or lt is not missing or le is not missing:
@@ -240,13 +246,13 @@ class ordered(index, lib.closable):
             elif gt is not missing:
                 fd, fi = gt, False
             else:
-                fd, fi = None, True
+                fd, fi = missing, True
             if le is not missing:
                 ld, li = le, True
             elif lt is not missing:
                 ld, li = lt, False
             else:
-                ld, li = None, True
+                ld, li = missing, True
             cur = self.cursor(self, fd, fi, ld, li, reverse)
         else:
             raise NameError("invalid get() specification")