mercurial/manifest.py
author Matt Mackall <mpm@selenic.com>
Fri, 27 Jun 2008 18:28:45 -0500
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child 6765 be142cb994ff
permissions -rw-r--r--
util: add sort helper
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# manifest.py - manifest revision 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
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# of the GNU General Public License, incorporated herein by reference.
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from node import bin, hex, nullid
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from revlog import revlog, RevlogError
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from i18n import _
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import array, struct, mdiff, parsers, util
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class manifestdict(dict):
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    def __init__(self, mapping=None, flags=None):
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        if mapping is None: mapping = {}
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        if flags is None: flags = {}
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        dict.__init__(self, mapping)
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        self._flags = flags
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    def flags(self, f):
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        return self._flags.get(f, "")
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    def set(self, f, flags):
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        self._flags[f] = flags
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    def copy(self):
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        return manifestdict(dict.copy(self), dict.copy(self._flags))
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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")
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    def parse(self, lines):
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        mfdict = manifestdict()
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        parsers.parse_manifest(mfdict, mfdict._flags, lines)
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        return mfdict
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    def readdelta(self, node):
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        return self.parse(mdiff.patchtext(self.delta(node)))
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    def read(self, node):
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        if node == nullid: return manifestdict() # 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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        self.listcache = array.array('c', text)
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        mapping = self.parse(text)
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        self.mapcache = (node, mapping)
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        return mapping
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    def _search(self, m, s, lo=0, hi=None):
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        '''return a tuple (start, end) that says where to find s within m.
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        If the string is found m[start:end] are the line containing
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        that string.  If start == end the string was not found and
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        they indicate the proper sorted insertion point.  This was
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        taken from bisect_left, and modified to find line start/end as
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        it goes along.
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        m should be a buffer or a string
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        s is a string'''
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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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    def find(self, node, f):
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        '''look up entry for a single file efficiently.
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        return (node, flags) pair if found, (None, None) if not.'''
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        if self.mapcache and node == self.mapcache[0]:
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            return self.mapcache[1].get(f), self.mapcache[1].flags(f)
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        text = self.revision(node)
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        start, end = self._search(text, f)
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        if start == end:
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            return None, None
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        l = text[start:end]
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        f, n = l.split('\0')
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        return bin(n[:40]), n[40:-1]
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    def add(self, map, transaction, link, p1=None, p2=None,
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            changed=None):
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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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        def checkforbidden(f):
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            if '\n' in f or '\r' in f:
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                raise RevlogError(_("'\\n' and '\\r' disallowed in filenames"))
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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 and self.listcache and p1 and self.mapcache[0] == p1):
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            files = util.sort(map)
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            for f in files:
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                checkforbidden(f)
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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" % (f, hex(map[f]), map.flags(f))
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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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            for f in changed[0]:
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                checkforbidden(f)
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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 = self._search(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]), map.flags(f))
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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") % 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,
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                             p1, p2, cachedelta)
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        self.mapcache = (n, map)
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        return n