~bzr-pqm/bzr/bzr.dev

# (C) 2005 Canonical

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

class RevisionReference(object):

    """

    Reference to a stored revision.

    Includes the revision_id and revision_sha1.

    """

    revision_id = None

    revision_sha1 = None

    def __init__(self, revision_id, revision_sha1=None):

        if revision_id == None \

           or isinstance(revision_id, basestring):

            self.revision_id = revision_id

        else:

            raise ValueError('bad revision_id %r' % revision_id)

        if revision_sha1 != None:

            if isinstance(revision_sha1, basestring) \

               and len(revision_sha1) == 40:

                self.revision_sha1 = revision_sha1

            else:

                raise ValueError('bad revision_sha1 %r' % revision_sha1)

class Revision(object):

    """Single revision on a branch.

    Revisions may know their revision_hash, but only once they've been

    written out.  This is not stored because you cannot write the hash

    into the file it describes.

    After bzr 0.0.5 revisions are allowed to have multiple parents.

    parents

        List of parent revisions, each is a RevisionReference.

    """

    inventory_id = None

    inventory_sha1 = None

    revision_id = None

    timestamp = None

    message = None

    timezone = None

    committer = None

    def __init__(self, **args):

        self.__dict__.update(args)

        self.parents = []

    def __repr__(self):

        return "<Revision id %s>" % self.revision_id

    def to_element(self):

        from bzrlib.xml import Element, SubElement

        root = Element('revision',

                       committer = self.committer,

                       timestamp = '%.9f' % self.timestamp,

                       revision_id = self.revision_id,

                       inventory_id = self.inventory_id,

                       inventory_sha1 = self.inventory_sha1,

                       )

        if self.timezone:

            root.set('timezone', str(self.timezone))

        root.text = '\n'

        msg = SubElement(root, 'message')

        msg.text = self.message

        msg.tail = '\n'

        if self.parents:

            pelts = SubElement(root, 'parents')

            pelts.tail = pelts.text = '\n'

            for rr in self.parents:

                assert isinstance(rr, RevisionReference)

                p = SubElement(pelts, 'revision_ref')

                p.tail = '\n'

                assert rr.revision_id

                p.set('revision_id', rr.revision_id)

                if rr.revision_sha1:

                    p.set('revision_sha1', rr.revision_sha1)

        return root

    def from_element(cls, elt):

        return unpack_revision(elt)

    from_element = classmethod(from_element)

def unpack_revision(elt):

    """Convert XML element into Revision object."""

    # <changeset> is deprecated...

    from bzrlib.errors import BzrError

    if elt.tag not in ('revision', 'changeset'):

        raise BzrError("unexpected tag in revision file: %r" % elt)

    rev = Revision(committer = elt.get('committer'),

                   timestamp = float(elt.get('timestamp')),

                   revision_id = elt.get('revision_id'),

                   inventory_id = elt.get('inventory_id'),

                   inventory_sha1 = elt.get('inventory_sha1')

                   )

    precursor = elt.get('precursor')

    precursor_sha1 = elt.get('precursor_sha1')

    pelts = elt.find('parents')

    if pelts:

        for p in pelts:

            assert p.tag == 'revision_ref', \

                   "bad parent node tag %r" % p.tag

            rev_ref = RevisionReference(p.get('revision_id'),

                                        p.get('revision_sha1'))

            rev.parents.append(rev_ref)

        if precursor:

            # must be consistent

            prec_parent = rev.parents[0].revision_id

            assert prec_parent == precursor

    elif precursor:

        # revisions written prior to 0.0.5 have a single precursor

        # give as an attribute

        rev_ref = RevisionReference(precursor, precursor_sha1)

        rev.parents.append(rev_ref)

    v = elt.get('timezone')

    rev.timezone = v and int(v)

    rev.message = elt.findtext('message') # text of <message>

    return rev

REVISION_ID_RE = None

def validate_revision_id(rid):

    """Check rid is syntactically valid for a revision id."""

    global REVISION_ID_RE

    if not REVISION_ID_RE:

        import re

        REVISION_ID_RE = re.compile('[\w.-]+@[\w.-]+--?\d+--?[0-9a-f]+\Z')

    if not REVISION_ID_RE.match(rid):

        raise ValueError("malformed revision-id %r" % rid)