mercurial/manifest.py
author Benoit Boissinot <benoit.boissinot@ens-lyon.org>
Wed, 15 Mar 2006 07:09:42 +0100
changeset 1956 16750010813d
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child 1680 c21b54f7f7b8
child 2072 74d3f5336b66
permissions -rw-r--r--
use a proper test instead of catching every exception
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# manifest.py - manifest revision class for mercurial
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#
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# Copyright 2005 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms
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# of the GNU General Public License, incorporated herein by reference.
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import struct
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from revlog import *
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from i18n import gettext as _
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from demandload import *
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demandload(globals(), "bisect array")
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class manifest(revlog):
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    def __init__(self, opener):
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        self.mapcache = None
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        self.listcache = None
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        revlog.__init__(self, opener, "00manifest.i", "00manifest.d")
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    def read(self, node):
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        if node == nullid: return {} # don't upset local cache
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        if self.mapcache and self.mapcache[0] == node:
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            return self.mapcache[1]
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        text = self.revision(node)
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        map = {}
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        flag = {}
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        self.listcache = array.array('c', text)
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        lines = text.splitlines(1)
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        for l in lines:
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            (f, n) = l.split('\0')
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            map[f] = bin(n[:40])
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            flag[f] = (n[40:-1] == "x")
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        self.mapcache = (node, map, flag)
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        return map
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    def readflags(self, node):
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        if node == nullid: return {} # don't upset local cache
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        if not self.mapcache or self.mapcache[0] != node:
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            self.read(node)
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        return self.mapcache[2]
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    def diff(self, a, b):
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        return mdiff.textdiff(str(a), str(b))
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    def add(self, map, flags, transaction, link, p1=None, p2=None,
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            changed=None):
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        # returns a tuple (start, end).  If the string is found
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        # m[start:end] are the line containing that string.  If start == end
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        # the string was not found and they indicate the proper sorted 
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        # insertion point.  This was taken from bisect_left, and modified
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        # to find line start/end as it goes along.
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        #
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        # m should be a buffer or a string
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        # s is a string
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        #
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        def manifestsearch(m, s, lo=0, hi=None):
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            def advance(i, c):
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                while i < lenm and m[i] != c:
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                    i += 1
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                return i
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            lenm = len(m)
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            if not hi:
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                hi = lenm
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            while lo < hi:
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                mid = (lo + hi) // 2
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                start = mid
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                while start > 0 and m[start-1] != '\n':
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                    start -= 1
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                end = advance(start, '\0')
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                if m[start:end] < s:
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                    # we know that after the null there are 40 bytes of sha1
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                    # this translates to the bisect lo = mid + 1
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                    lo = advance(end + 40, '\n') + 1
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                else:
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                    # this translates to the bisect hi = mid
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                    hi = start
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            end = advance(lo, '\0')
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            found = m[lo:end]
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            if cmp(s, found) == 0: 
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                # we know that after the null there are 40 bytes of sha1
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                end = advance(end + 40, '\n')
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                return (lo, end+1)
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            else:
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                return (lo, lo)
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        # apply the changes collected during the bisect loop to our addlist
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        # return a delta suitable for addrevision
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        def addlistdelta(addlist, x):
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            # start from the bottom up
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            # so changes to the offsets don't mess things up.
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            i = len(x)
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            while i > 0:
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                i -= 1
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                start = x[i][0]
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                end = x[i][1]
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                if x[i][2]:
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                    addlist[start:end] = array.array('c', x[i][2])
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                else:
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                    del addlist[start:end]
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            return "".join([struct.pack(">lll", d[0], d[1], len(d[2])) + d[2] \
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                            for d in x ])
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        # if we're using the listcache, make sure it is valid and
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        # parented by the same node we're diffing against
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        if not changed or not self.listcache or not p1 or \
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               self.mapcache[0] != p1:
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            files = map.keys()
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            files.sort()
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            # if this is changed to support newlines in filenames,
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            # be sure to check the templates/ dir again (especially *-raw.tmpl)
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            text = ["%s\000%s%s\n" %
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                            (f, hex(map[f]), flags[f] and "x" or '')
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                            for f in files]
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            self.listcache = array.array('c', "".join(text))
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            cachedelta = None
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        else:
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            addlist = self.listcache
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            # combine the changed lists into one list for sorting
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            work = [[x, 0] for x in changed[0]]
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            work[len(work):] = [[x, 1] for x in changed[1]]
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            work.sort()
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            delta = []
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            dstart = None
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            dend = None
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            dline = [""]
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            start = 0
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            # zero copy representation of addlist as a buffer
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            addbuf = buffer(addlist)
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            # start with a readonly loop that finds the offset of
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            # each line and creates the deltas
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            for w in work:
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                f = w[0]
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                # bs will either be the index of the item or the insert point
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                start, end = manifestsearch(addbuf, f, start)
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                if w[1] == 0:
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                    l = "%s\000%s%s\n" % (f, hex(map[f]),
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                                          flags[f] and "x" or '')
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                else:
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                    l = ""
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                if start == end and w[1] == 1:
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                    # item we want to delete was not found, error out
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                    raise AssertionError(
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                            _("failed to remove %s from manifest\n") % f)
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                if dstart != None and dstart <= start and dend >= start:
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                    if dend < end:
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                        dend = end
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                    if l:
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                        dline.append(l)
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                else:
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                    if dstart != None:
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                        delta.append([dstart, dend, "".join(dline)])
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                    dstart = start
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                    dend = end
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                    dline = [l]
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            if dstart != None:
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                delta.append([dstart, dend, "".join(dline)])
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            # apply the delta to the addlist, and get a delta for addrevision
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            cachedelta = addlistdelta(addlist, delta)
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            # the delta is only valid if we've been processing the tip revision
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            if self.mapcache[0] != self.tip():
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                cachedelta = None
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            self.listcache = addlist
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        n = self.addrevision(buffer(self.listcache), transaction, link, p1,  \
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                             p2, cachedelta)
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        self.mapcache = (n, map, flags)
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        return n