mercurial/manifest.py
author Mads Kiilerich <madski@unity3d.com>
Fri, 28 Dec 2012 11:55:57 +0100
changeset 18149 2dcc3653b361
parent 17983 c64e646af81e
child 18604 a1141f04e368
permissions -rw-r--r--
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Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 of the
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# GNU General Public License version 2 or any later version.
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from i18n import _
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import mdiff, parsers, error, revlog, util
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import array, struct
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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:
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            mapping = {}
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        if flags is None:
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            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 withflags(self):
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        return set(self._flags.keys())
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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(self, dict.copy(self._flags))
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class manifest(revlog.revlog):
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    def __init__(self, opener):
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        self._mancache = None
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        revlog.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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        r = self.rev(node)
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        return self.parse(mdiff.patchtext(self.revdiff(self.deltaparent(r), r)))
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    def readfast(self, node):
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        '''use the faster of readdelta or read'''
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        r = self.rev(node)
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        deltaparent = self.deltaparent(r)
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        if deltaparent != revlog.nullrev and deltaparent in self.parentrevs(r):
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            return self.readdelta(node)
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        return self.read(node)
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    def read(self, node):
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        if node == revlog.nullid:
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            return manifestdict() # don't upset local cache
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        if self._mancache and self._mancache[0] == node:
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            return self._mancache[1]
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        text = self.revision(node)
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        arraytext = array.array('c', text)
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        mapping = self.parse(text)
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        self._mancache = (node, mapping, arraytext)
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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.
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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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        if not s:
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            return (lo, lo)
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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 s == found:
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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._mancache and self._mancache[0] == node:
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            return self._mancache[1].get(f), self._mancache[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 revlog.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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            # for large addlist arrays, building a new array is cheaper
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            # than repeatedly modifying the existing one
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            currentposition = 0
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            newaddlist = array.array('c')
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            for start, end, content in x:
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                newaddlist += addlist[currentposition:start]
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                if content:
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                    newaddlist += array.array('c', content)
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                currentposition = end
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            newaddlist += addlist[currentposition:]
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            deltatext = "".join(struct.pack(">lll", start, end, len(content))
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                           + content for start, end, content in x)
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            return deltatext, newaddlist
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        def checkforbidden(l):
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            for f in l:
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                if '\n' in f or '\r' in f:
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                    raise error.RevlogError(
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                        _("'\\n' and '\\r' disallowed in filenames: %r") % f)
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        # if we're using the cache, 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._mancache and p1 and self._mancache[0] == p1):
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            files = sorted(map)
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            checkforbidden(files)
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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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            hex, flags = revlog.hex, map.flags
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            text = ''.join("%s\0%s%s\n" % (f, hex(map[f]), flags(f))
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                           for f in files)
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            arraytext = array.array('c', text)
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            cachedelta = None
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        else:
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            added, removed = changed
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            addlist = self._mancache[2]
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            checkforbidden(added)
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            # combine the changed lists into one list for sorting
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            work = [(x, False) for x in added]
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            work.extend((x, True) for x in removed)
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            # this could use heapq.merge() (from Python 2.6+) or equivalent
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            # since the lists are already sorted
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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 = util.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 f, todelete in work:
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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 not todelete:
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                    l = "%s\0%s%s\n" % (f, revlog.hex(map[f]), map.flags(f))
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                else:
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                    if start == end:
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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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                    l = ""
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                if dstart is not 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 is not 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 is not 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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            deltatext, addlist = addlistdelta(addlist, delta)
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            cachedelta = (self.rev(p1), deltatext)
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            arraytext = addlist
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            text = util.buffer(arraytext)
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        n = self.addrevision(text, transaction, link, p1, p2, cachedelta)
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        self._mancache = (n, map, arraytext)
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        return n