~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005 Canonical Ltd

#

# 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

import bisect

import datetime

import re

from bzrlib import (

    errors,

    revision,

    symbol_versioning,

    trace,

    tsort,

    )

_marker = []

class RevisionInfo(object):

    """The results of applying a revision specification to a branch.

    An instance has two useful attributes: revno, and rev_id.

    They can also be accessed as spec[0] and spec[1] respectively,

    so that you can write code like:

    revno, rev_id = RevisionSpec(branch, spec)

    although this is probably going to be deprecated later.

    This class exists mostly to be the return value of a RevisionSpec,

    so that you can access the member you're interested in (number or id)

    or treat the result as a tuple.

    """

    def __init__(self, branch, revno, rev_id=_marker):

        self.branch = branch

        self.revno = revno

        if rev_id is _marker:

            # allow caller to be lazy

            if self.revno is None:

                self.rev_id = None

            else:

                self.rev_id = branch.get_rev_id(self.revno)

        else:

            self.rev_id = rev_id

    def __nonzero__(self):

        # first the easy ones...

        if self.rev_id is None:

            return False

        if self.revno is not None:

            return True

        # TODO: otherwise, it should depend on how I was built -

        # if it's in_history(branch), then check revision_history(),

        # if it's in_store(branch), do the check below

        return self.branch.repository.has_revision(self.rev_id)

    def __len__(self):

        return 2

    def __getitem__(self, index):

        if index == 0: return self.revno

        if index == 1: return self.rev_id

        raise IndexError(index)

    def get(self):

        return self.branch.repository.get_revision(self.rev_id)

    def __eq__(self, other):

        if type(other) not in (tuple, list, type(self)):

            return False

        if type(other) is type(self) and self.branch is not other.branch:

            return False

        return tuple(self) == tuple(other)

    def __repr__(self):

        return '<bzrlib.revisionspec.RevisionInfo object %s, %s for %r>' % (

            self.revno, self.rev_id, self.branch)

# classes in this list should have a "prefix" attribute, against which

# string specs are matched

SPEC_TYPES = []

_revno_regex = None

class RevisionSpec(object):

    """A parsed revision specification.

    A revision specification can be an integer, in which case it is

    assumed to be a revno (though this will translate negative values

    into positive ones); or it can be a string, in which case it is

    parsed for something like 'date:' or 'revid:' etc.

    Revision specs are an UI element, and they have been moved out

    of the branch class to leave "back-end" classes unaware of such

    details.  Code that gets a revno or rev_id from other code should

    not be using revision specs - revnos and revision ids are the

    accepted ways to refer to revisions internally.

    (Equivalent to the old Branch method get_revision_info())

    """

    prefix = None

    def __new__(cls, spec, _internal=False):

        if _internal:

            return object.__new__(cls, spec, _internal=_internal)

        symbol_versioning.warn('Creating a RevisionSpec directly has'

                               ' been deprecated in version 0.11. Use'

                               ' RevisionSpec.from_string()'

                               ' instead.',

                               DeprecationWarning, stacklevel=2)

        return RevisionSpec.from_string(spec)

    @staticmethod

    def from_string(spec):

        """Parse a revision spec string into a RevisionSpec object.

        :param spec: A string specified by the user

        :return: A RevisionSpec object that understands how to parse the

            supplied notation.

        """

        if not isinstance(spec, (type(None), basestring)):

            raise TypeError('error')

        if spec is None:

            return RevisionSpec(None, _internal=True)

        assert isinstance(spec, basestring), \

            "You should only supply strings not %s" % (type(spec),)

        for spectype in SPEC_TYPES:

            if spec.startswith(spectype.prefix):

                trace.mutter('Returning RevisionSpec %s for %s',

                             spectype.__name__, spec)

                return spectype(spec, _internal=True)

        else:

            # RevisionSpec_revno is special cased, because it is the only

            # one that directly handles plain integers

            # TODO: This should not be special cased rather it should be

            # a method invocation on spectype.canparse()

            global _revno_regex

            if _revno_regex is None:

                _revno_regex = re.compile(r'^(?:(\d+(\.\d+)*)|-\d+)(:.*)?$')

            if _revno_regex.match(spec) is not None:

                return RevisionSpec_revno(spec, _internal=True)

            raise errors.NoSuchRevisionSpec(spec)

    def __init__(self, spec, _internal=False):

        """Create a RevisionSpec referring to the Null revision.

        :param spec: The original spec supplied by the user

        :param _internal: Used to ensure that RevisionSpec is not being

            called directly. Only from RevisionSpec.from_string()

        """

        if not _internal:

            # XXX: Update this after 0.10 is released

            symbol_versioning.warn('Creating a RevisionSpec directly has'

                                   ' been deprecated in version 0.11. Use'

                                   ' RevisionSpec.from_string()'

                                   ' instead.',

                                   DeprecationWarning, stacklevel=2)

        self.user_spec = spec

        if self.prefix and spec.startswith(self.prefix):

            spec = spec[len(self.prefix):]

        self.spec = spec

    def _match_on(self, branch, revs):

        trace.mutter('Returning RevisionSpec._match_on: None')

        return RevisionInfo(branch, 0, None)

    def _match_on_and_check(self, branch, revs):

        info = self._match_on(branch, revs)

        if info:

            return info

        elif info == (0, None):

            # special case - the empty tree

            return info

        elif self.prefix:

            raise errors.InvalidRevisionSpec(self.user_spec, branch)

        else:

            raise errors.InvalidRevisionSpec(self.spec, branch)

    def in_history(self, branch):

        if branch:

            revs = branch.revision_history()

        else:

            # this should never trigger.

            # TODO: make it a deprecated code path. RBC 20060928

            revs = None

        return self._match_on_and_check(branch, revs)

        # FIXME: in_history is somewhat broken,

        # it will return non-history revisions in many

        # circumstances. The expected facility is that

        # in_history only returns revision-history revs,

        # in_store returns any rev. RBC 20051010

    # aliases for now, when we fix the core logic, then they

    # will do what you expect.

    in_store = in_history

    in_branch = in_store

    def __repr__(self):

        # this is mostly for helping with testing

        return '<%s %s>' % (self.__class__.__name__,

                              self.user_spec)

    def needs_branch(self):

        """Whether this revision spec needs a branch.

        Set this to False the branch argument of _match_on is not used.

        """

        return True

    def get_branch(self):

        """When the revision specifier contains a branch location, return it.

        Otherwise, return None.

        """

        return None

# private API

class RevisionSpec_revno(RevisionSpec):

    prefix = 'revno:'

    def _match_on(self, branch, revs):

        """Lookup a revision by revision number"""

        loc = self.spec.find(':')

        if loc == -1:

            revno_spec = self.spec

            branch_spec = None

        else:

            revno_spec = self.spec[:loc]

            branch_spec = self.spec[loc+1:]

        if revno_spec == '':

            if not branch_spec:

                raise errors.InvalidRevisionSpec(self.user_spec,

                        branch, 'cannot have an empty revno and no branch')

            revno = None

        else:

            try:

                revno = int(revno_spec)

                dotted = False

            except ValueError:

                # dotted decimal. This arguably should not be here

                # but the from_string method is a little primitive 

                # right now - RBC 20060928

                try:

                    match_revno = tuple((int(number) for number in revno_spec.split('.')))

                except ValueError, e:

                    raise errors.InvalidRevisionSpec(self.user_spec, branch, e)

                dotted = True

        if branch_spec:

            # the user has override the branch to look in.

            # we need to refresh the revision_history map and

            # the branch object.

            from bzrlib.branch import Branch

            branch = Branch.open(branch_spec)

            # Need to use a new revision history

            # because we are using a specific branch

            revs = branch.revision_history()

        if dotted:

            branch.lock_read()

            try:

                last_rev = branch.last_revision()

                merge_sorted_revisions = tsort.merge_sort(

                    branch.repository.get_revision_graph(last_rev),

                    last_rev,

                    generate_revno=True)

                def match(item):

                    return item[3] == match_revno

                revisions = filter(match, merge_sorted_revisions)

            finally:

                branch.unlock()

            if len(revisions) != 1:

                return RevisionInfo(branch, None, None)

            else:

                # there is no traditional 'revno' for dotted-decimal revnos.

                # so for  API compatability we return None.

                return RevisionInfo(branch, None, revisions[0][1])

        else:

            if revno < 0:

                if (-revno) >= len(revs):

                    revno = 1

                else:

                    revno = len(revs) + revno + 1

            try:

                revision_id = branch.get_rev_id(revno, revs)

            except errors.NoSuchRevision:

                raise errors.InvalidRevisionSpec(self.user_spec, branch)

        return RevisionInfo(branch, revno, revision_id)

    def needs_branch(self):

        return self.spec.find(':') == -1

    def get_branch(self):

        if self.spec.find(':') == -1:

            return None

        else:

            return self.spec[self.spec.find(':')+1:]

# Old compatibility 

RevisionSpec_int = RevisionSpec_revno

SPEC_TYPES.append(RevisionSpec_revno)

class RevisionSpec_revid(RevisionSpec):

    prefix = 'revid:'

    def _match_on(self, branch, revs):

        try:

            revno = revs.index(self.spec) + 1

        except ValueError:

            revno = None

        return RevisionInfo(branch, revno, self.spec)

SPEC_TYPES.append(RevisionSpec_revid)

class RevisionSpec_last(RevisionSpec):

    prefix = 'last:'

    def _match_on(self, branch, revs):

        if self.spec == '':

            if not revs:

                raise errors.NoCommits(branch)

            return RevisionInfo(branch, len(revs), revs[-1])

        try:

            offset = int(self.spec)

        except ValueError, e:

            raise errors.InvalidRevisionSpec(self.user_spec, branch, e)

        if offset <= 0:

            raise errors.InvalidRevisionSpec(self.user_spec, branch,

                                             'you must supply a positive value')

        revno = len(revs) - offset + 1

        try:

            revision_id = branch.get_rev_id(revno, revs)

        except errors.NoSuchRevision:

            raise errors.InvalidRevisionSpec(self.user_spec, branch)

        return RevisionInfo(branch, revno, revision_id)

SPEC_TYPES.append(RevisionSpec_last)

class RevisionSpec_before(RevisionSpec):

    prefix = 'before:'

    def _match_on(self, branch, revs):

        r = RevisionSpec.from_string(self.spec)._match_on(branch, revs)

        if r.revno == 0:

            raise errors.InvalidRevisionSpec(self.user_spec, branch,

                                         'cannot go before the null: revision')

        if r.revno is None:

            # We need to use the repository history here

            rev = branch.repository.get_revision(r.rev_id)

            if not rev.parent_ids:

                revno = 0

                revision_id = None

            else:

                revision_id = rev.parent_ids[0]

                try:

                    revno = revs.index(revision_id) + 1

                except ValueError:

                    revno = None

        else:

            revno = r.revno - 1

            try:

                revision_id = branch.get_rev_id(revno, revs)

            except errors.NoSuchRevision:

                raise errors.InvalidRevisionSpec(self.user_spec,

                                                 branch)

        return RevisionInfo(branch, revno, revision_id)

SPEC_TYPES.append(RevisionSpec_before)

class RevisionSpec_tag(RevisionSpec):

    prefix = 'tag:'

    def _match_on(self, branch, revs):

        raise errors.InvalidRevisionSpec(self.user_spec, branch,

                                         'tag: namespace registered,'

                                         ' but not implemented')

SPEC_TYPES.append(RevisionSpec_tag)

class _RevListToTimestamps(object):

    """This takes a list of revisions, and allows you to bisect by date"""

    __slots__ = ['revs', 'branch']

    def __init__(self, revs, branch):

        self.revs = revs

        self.branch = branch

    def __getitem__(self, index):

        """Get the date of the index'd item"""

        r = self.branch.repository.get_revision(self.revs[index])

        # TODO: Handle timezone.

        return datetime.datetime.fromtimestamp(r.timestamp)

    def __len__(self):

        return len(self.revs)

class RevisionSpec_date(RevisionSpec):

    prefix = 'date:'

    _date_re = re.compile(

            r'(?P<date>(?P<year>\d\d\d\d)-(?P<month>\d\d)-(?P<day>\d\d))?'

            r'(,|T)?\s*'

            r'(?P<time>(?P<hour>\d\d):(?P<minute>\d\d)(:(?P<second>\d\d))?)?'

        )

    def _match_on(self, branch, revs):

        """

        Spec for date revisions:

          date:value

          value can be 'yesterday', 'today', 'tomorrow' or a YYYY-MM-DD string.

          matches the first entry after a given date (either at midnight or

          at a specified time).

          So the proper way of saying 'give me all entries for today' is:

              -r date:yesterday..date:today

        """

        today = datetime.datetime.fromordinal(datetime.date.today().toordinal())

        if self.spec.lower() == 'yesterday':

            dt = today - datetime.timedelta(days=1)

        elif self.spec.lower() == 'today':

            dt = today

        elif self.spec.lower() == 'tomorrow':

            dt = today + datetime.timedelta(days=1)

        else:

            m = self._date_re.match(self.spec)

            if not m or (not m.group('date') and not m.group('time')):

                raise errors.InvalidRevisionSpec(self.user_spec,

                                                 branch, 'invalid date')

            try:

                if m.group('date'):

                    year = int(m.group('year'))

                    month = int(m.group('month'))

                    day = int(m.group('day'))

                else:

                    year = today.year

                    month = today.month

                    day = today.day

                if m.group('time'):

                    hour = int(m.group('hour'))

                    minute = int(m.group('minute'))

                    if m.group('second'):

                        second = int(m.group('second'))

                    else:

                        second = 0

                else:

                    hour, minute, second = 0,0,0

            except ValueError:

                raise errors.InvalidRevisionSpec(self.user_spec,

                                                 branch, 'invalid date')

            dt = datetime.datetime(year=year, month=month, day=day,

                    hour=hour, minute=minute, second=second)

        branch.lock_read()

        try:

            rev = bisect.bisect(_RevListToTimestamps(revs, branch), dt)

        finally:

            branch.unlock()

        if rev == len(revs):

            return RevisionInfo(branch, None)

        else:

            return RevisionInfo(branch, rev + 1)

SPEC_TYPES.append(RevisionSpec_date)

class RevisionSpec_ancestor(RevisionSpec):

    prefix = 'ancestor:'

    def _match_on(self, branch, revs):

        from bzrlib.branch import Branch

        trace.mutter('matching ancestor: on: %s, %s', self.spec, branch)

        other_branch = Branch.open(self.spec)

        revision_a = branch.last_revision()

        revision_b = other_branch.last_revision()

        for r, b in ((revision_a, branch), (revision_b, other_branch)):

            if r in (None, revision.NULL_REVISION):

                raise errors.NoCommits(b)

        revision_source = revision.MultipleRevisionSources(

                branch.repository, other_branch.repository)

        rev_id = revision.common_ancestor(revision_a, revision_b,

                                          revision_source)

        try:

            revno = branch.revision_id_to_revno(rev_id)

        except errors.NoSuchRevision:

            revno = None

        return RevisionInfo(branch, revno, rev_id)

SPEC_TYPES.append(RevisionSpec_ancestor)

class RevisionSpec_branch(RevisionSpec):

    """A branch: revision specifier.

    This takes the path to a branch and returns its tip revision id.

    """

    prefix = 'branch:'

    def _match_on(self, branch, revs):

        from bzrlib.branch import Branch

        other_branch = Branch.open(self.spec)

        revision_b = other_branch.last_revision()

        if revision_b in (None, revision.NULL_REVISION):

            raise errors.NoCommits(other_branch)

        # pull in the remote revisions so we can diff

        branch.fetch(other_branch, revision_b)

        try:

            revno = branch.revision_id_to_revno(revision_b)

        except errors.NoSuchRevision:

            revno = None

        return RevisionInfo(branch, revno, revision_b)

SPEC_TYPES.append(RevisionSpec_branch)