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comparison mercurial/revlog.py @ 3438:b17f9d3eda74

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revlog.lookup tweaks - fast path for binary node ids - direct lookup for full hex ids - silly change to bin_id
author Matt Mackall <mpm@selenic.com>
date Tue, 17 Oct 2006 22:07:54 -0500
parents a74addddd092
children dba3cadef789 c6773b7ebee8
comparison
equal deleted inserted replaced
3437:d96429ddc8e2 3438:b17f9d3eda74
752 - nodeid or subset of hex nodeid 752 - nodeid or subset of hex nodeid
753 """ 753 """
754 if isinstance(id, (long, int)): 754 if isinstance(id, (long, int)):
755 # rev 755 # rev
756 return self.node(id) 756 return self.node(id)
757 if len(id) == 20:
758 # possibly a binary node
759 # odds of a binary node being all hex in ASCII are 1 in 10**25
760 try:
761 node = id
762 r = self.rev(node) # quick search the index
763 return node
764 except RevlogError:
765 pass # may be partial hex id
757 try: 766 try:
758 # str(rev) 767 # str(rev)
759 rev = int(id) 768 rev = int(id)
760 if str(rev) != id: raise ValueError 769 if str(rev) != id: raise ValueError
761 if rev < 0: rev = self.count() + rev 770 if rev < 0: rev = self.count() + rev
762 if rev < 0 or rev >= self.count(): raise ValueError 771 if rev < 0 or rev >= self.count(): raise ValueError
763 return self.node(rev) 772 return self.node(rev)
764 except (ValueError, OverflowError): 773 except (ValueError, OverflowError):
765 pass 774 pass
766 try: 775 try:
767 # hex(node)[:...] 776 if len(id) == 40:
768 if len(id) % 2 == 0: 777 # a full hex nodeid?
769 bin_id = bin(id) 778 node = bin(id)
770 else: 779 r = self.rev(node)
771 bin_id = bin(id[:-1])
772 node = None
773 for n in self.nodemap:
774 if n.startswith(bin_id) and hex(n).startswith(id):
775 if node is not None:
776 raise RevlogError(_("Ambiguous identifier"))
777 node = n
778 if node is not None:
779 return node 780 return node
781 elif len(id) < 40:
782 # hex(node)[:...]
783 bin_id = bin(id[:len(id) & ~1]) # grab an even number of digits
784 node = None
785 for n in self.nodemap:
786 if n.startswith(bin_id) and hex(n).startswith(id):
787 if node is not None:
788 raise RevlogError(_("Ambiguous identifier"))
789 node = n
790 if node is not None:
791 return node
780 except TypeError: 792 except TypeError:
781 pass 793 pass
782
783 # might need fixing if we change hash lengths
784 if len(id) == 20 and id in self.nodemap:
785 # node
786 return id
787 794
788 raise RevlogError(_("No match found")) 795 raise RevlogError(_("No match found"))
789 796
790 def cmp(self, node, text): 797 def cmp(self, node, text):
791 """compare text with a given file revision""" 798 """compare text with a given file revision"""