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−# filelog.py - file history class for mercurial
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−#
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−# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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−#
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−# This software may be used and distributed according to the terms of the
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−# GNU General Public License version 2 or any later version.
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−
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−import revlog
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−import re
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−
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−_mdre = re.compile('\1\n')
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−def _parsemeta(text):
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−    """return (metadatadict, keylist, metadatasize)"""
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−    # text can be buffer, so we can't use .startswith or .index
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−    if text[:2] != '\1\n':
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−        return None, None, None
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−    s = _mdre.search(text, 2).start()
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−    mtext = text[2:s]
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−    meta = {}
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−    keys = []
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−    for l in mtext.splitlines():
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−        k, v = l.split(": ", 1)
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−        meta[k] = v
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−        keys.append(k)
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−    return meta, keys, (s + 2)
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−
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−def _packmeta(meta, keys=None):
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−    if not keys:
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−        keys = sorted(meta.iterkeys())
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−    return "".join("%s: %s\n" % (k, meta[k]) for k in keys)
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−
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−class filelog(revlog.revlog):
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−    def __init__(self, opener, path):
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−        revlog.revlog.__init__(self, opener,
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−                        "/".join(("data", path + ".i")))
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−
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−    def read(self, node):
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−        t = self.revision(node)
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−        if not t.startswith('\1\n'):
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−            return t
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−        s = t.index('\1\n', 2)
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−        return t[s + 2:]
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−
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−    def add(self, text, meta, transaction, link, p1=None, p2=None):
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−        if meta or text.startswith('\1\n'):
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−            text = "\1\n%s\1\n%s" % (_packmeta(meta), text)
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−        return self.addrevision(text, transaction, link, p1, p2)
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−
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−    def renamed(self, node):
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−        if self.parents(node)[0] != revlog.nullid:
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−            return False
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−        t = self.revision(node)
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−        m = _parsemeta(t)[0]
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−        if m and "copy" in m:
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−            return (m["copy"], revlog.bin(m["copyrev"]))
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−        return False
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−
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−    def size(self, rev):
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−        """return the size of a given revision"""
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−
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−        # for revisions with renames, we have to go the slow way
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−        node = self.node(rev)
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−        if self.renamed(node):
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−            return len(self.read(node))
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−
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−        # XXX if self.read(node).startswith("\1\n"), this returns (size+4)
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−        return revlog.revlog.size(self, rev)
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−
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−    def cmp(self, node, text):
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−        """compare text with a given file revision
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−
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−        returns True if text is different than what is stored.
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−        """
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−
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−        t = text
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−        if text.startswith('\1\n'):
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−            t = '\1\n\1\n' + text
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−
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−        samehashes = not revlog.revlog.cmp(self, node, t)
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−        if samehashes:
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−            return False
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−
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−        # renaming a file produces a different hash, even if the data
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−        # remains unchanged. Check if it's the case (slow):
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−        if self.renamed(node):
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−            t2 = self.read(node)
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−            return t2 != text
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−
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−        return True
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−
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−    def _file(self, f):
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−        return filelog(self.opener, f)