comparison mercurial/revset.py @ 43077:687b865b95ad

formatting: byteify all mercurial/ and hgext/ string literals

Done with

    python3.7 contrib/byteify-strings.py -i $(hg files 'set:mercurial/**.py - mercurial/thirdparty/** + hgext/**.py - hgext/fsmonitor/pywatchman/** - mercurial/__init__.py')
    black -l 80 -t py33 -S $(hg files 'set:**.py - mercurial/thirdparty/** - "contrib/python-zstandard/**" - hgext/fsmonitor/pywatchman/**')

# skip-blame mass-reformatting only

Differential Revision: https://phab.mercurial-scm.org/D6972

43076:2372284d9457

#           ^^^^^^
#      For most revsets, 'define' means using the order this subset provides
#
# There are a few revsets that always redefine the order if 'define' is
# specified: 'sort(X)', 'reverse(X)', 'x:y'.
anyorder = 'any'  # don't care the order, could be even random-shuffled
defineorder = 'define'  # ALWAYS redefine, or ALWAYS follow the current order
followorder = 'follow'  # MUST follow the current order

# helpers


def getset(repo, subset, x, order=defineorder):
    if not x:
        raise error.ParseError(_("missing argument"))
    return methods[x[0]](repo, subset, *x[1:], order=order)


def _getrevsource(repo, r):
    extra = repo[r].extra()
    for label in ('source', 'transplant_source', 'rebase_source'):
        if label in extra:
            try:
                return repo[extra[label]].rev()
            except error.RepoLookupError:
                pass

# operator methods


def stringset(repo, subset, x, order):
    if not x:
        raise error.ParseError(_("empty string is not a valid revision"))
    x = scmutil.intrev(scmutil.revsymbol(repo, x))
    if x in subset or x in _virtualrevs and isinstance(subset, fullreposet):
        return baseset([x])
    return baseset()

def notset(repo, subset, x, order):
    return subset - getset(repo, subset, x, anyorder)


def relationset(repo, subset, x, y, order):
    raise error.ParseError(_("can't use a relation in this context"))


def _splitrange(a, b):
    """Split range with bounds a and b into two ranges at 0 and return two
    tuples of numbers for use as startdepth and stopdepth arguments of

def generationsrel(repo, subset, x, rel, z, order):
    # TODO: rewrite tests, and drop startdepth argument from ancestors() and
    # descendants() predicates
    a, b = getintrange(
        z,
        _('relation subscript must be an integer or a range'),
        _('relation subscript bounds must be integers'),
        deffirst=-(dagop.maxlogdepth - 1),
        deflast=+(dagop.maxlogdepth - 1),
    )
    (ancstart, ancstop), (descstart, descstop) = _splitrange(a, b)

    relnames = [r for r in subscriptrelations.keys() if len(r) > 1]
    raise error.UnknownIdentifier(rel, relnames)


def subscriptset(repo, subset, x, y, order):
    raise error.ParseError(_("can't use a subscript in this context"))


def listset(repo, subset, *xs, **opts):
    raise error.ParseError(
        _("can't use a list in this context"),
        hint=_('see \'hg help "revsets.x or y"\''),
    )


def keyvaluepair(repo, subset, k, v, order):
    raise error.ParseError(_("can't use a key-value pair in this context"))


def func(repo, subset, a, b, order):
    f = getsymbol(a)
    if f in symbols:

safesymbols = set()

predicate = registrar.revsetpredicate()


@predicate('_destupdate')
def _destupdate(repo, subset, x):
    # experimental revset for update destination
    args = getargsdict(x, 'limit', 'clean')
    return subset & baseset(
        [destutil.destupdate(repo, **pycompat.strkwargs(args))[0]]
    )


@predicate('_destmerge')
def _destmerge(repo, subset, x):
    # experimental revset for merge destination
    sourceset = None
    if x is not None:
        sourceset = getset(repo, fullreposet(repo), x)
    return subset & baseset([destutil.destmerge(repo, sourceset=sourceset)])


@predicate('adds(pattern)', safe=True, weight=30)
def adds(repo, subset, x):
    """Changesets that add a file matching pattern.

    The pattern without explicit kind like ``glob:`` is expected to be
    relative to the current directory and match against a file or a
    directory.
    """
    # i18n: "adds" is a keyword
    pat = getstring(x, _("adds requires a pattern"))
    return checkstatus(repo, subset, pat, 1)


@predicate('ancestor(*changeset)', safe=True, weight=0.5)
def ancestor(repo, subset, x):
    """A greatest common ancestor of the changesets.

    Accepts 0 or more changesets.
    Will return empty list when passed no args.

        return baseset()
    s = dagop.revancestors(repo, heads, followfirst, startdepth, stopdepth)
    return subset & s


@predicate('ancestors(set[, depth])', safe=True)
def ancestors(repo, subset, x):
    """Changesets that are ancestors of changesets in set, including the
    given changesets themselves.

    If depth is specified, the result only includes changesets up to
    the specified generation.
    """
    # startdepth is for internal use only until we can decide the UI
    args = getargsdict(x, 'ancestors', 'set depth startdepth')
    if 'set' not in args:
        # i18n: "ancestors" is a keyword
        raise error.ParseError(_('ancestors takes at least 1 argument'))
    startdepth = stopdepth = None
    if 'startdepth' in args:
        n = getinteger(
            args['startdepth'], "ancestors expects an integer startdepth"
        )
        if n < 0:
            raise error.ParseError("negative startdepth")
        startdepth = n
    if 'depth' in args:
        # i18n: "ancestors" is a keyword
        n = getinteger(args['depth'], _("ancestors expects an integer depth"))
        if n < 0:
            raise error.ParseError(_("negative depth"))
        stopdepth = n + 1
    return _ancestors(
        repo, subset, args['set'], startdepth=startdepth, stopdepth=stopdepth
    )


@predicate('_firstancestors', safe=True)
def _firstancestors(repo, subset, x):
    # ``_firstancestors(set)``
    # Like ``ancestors(set)`` but follows only the first parents.
    return _ancestors(repo, subset, x, followfirst=True)

            c = repo[r].children()
            if len(c) == 0:
                break
            if len(c) > 1:
                raise error.RepoLookupError(
                    _("revision in set has more than one child")
                )
            r = c[0].rev()
        else:
            cs.add(r)
    return subset & cs

def ancestorspec(repo, subset, x, n, order):
    """``set~n``
    Changesets that are the Nth ancestor (first parents only) of a changeset
    in set.
    """
    n = getinteger(n, _("~ expects a number"))
    if n < 0:
        # children lookup
        return _childrenspec(repo, subset, x, -n, order)
    ps = set()
    cl = repo.changelog

                r = repo[r].p1().rev()
        ps.add(r)
    return subset & ps


@predicate('author(string)', safe=True, weight=10)
def author(repo, subset, x):
    """Alias for ``user(string)``.
    """
    # i18n: "author" is a keyword
    n = getstring(x, _("author requires a string"))
    kind, pattern, matcher = _substringmatcher(n, casesensitive=False)
    return subset.filter(
        lambda x: matcher(repo[x].user()), condrepr=('<user %r>', n)
    )


@predicate('bisect(string)', safe=True)
def bisect(repo, subset, x):
    """Changesets marked in the specified bisect status:

    - ``good``, ``bad``, ``skip``: csets explicitly marked as good/bad/skip
    - ``goods``, ``bads``      : csets topologically good/bad

    - ``untested``           : csets whose fate is yet unknown
    - ``ignored``            : csets ignored due to DAG topology
    - ``current``            : the cset currently being bisected
    """
    # i18n: "bisect" is a keyword
    status = getstring(x, _("bisect requires a string")).lower()
    state = set(hbisect.get(repo, status))
    return subset & state


# Backward-compatibility
# - no help entry so that we do not advertise it any more
@predicate('bisected', safe=True)
def bisected(repo, subset, x):
    return bisect(repo, subset, x)


@predicate('bookmark([name])', safe=True)
def bookmark(repo, subset, x):
    """The named bookmark or all bookmarks.

    Pattern matching is supported for `name`. See :hg:`help revisions.patterns`.
    """
    # i18n: "bookmark" is a keyword
    args = getargs(x, 0, 1, _('bookmark takes one or no arguments'))
    if args:
        bm = getstring(
            args[0],
            # i18n: "bookmark" is a keyword
            _('the argument to bookmark must be a string'),
        )
        kind, pattern, matcher = stringutil.stringmatcher(bm)
        bms = set()
        if kind == 'literal':
            if bm == pattern:
                pattern = repo._bookmarks.expandname(pattern)
            bmrev = repo._bookmarks.get(pattern, None)
            if not bmrev:
                raise error.RepoLookupError(
                    _("bookmark '%s' does not exist") % pattern
                )
            bms.add(repo[bmrev].rev())
        else:
            matchrevs = set()
            for name, bmrev in repo._bookmarks.iteritems():

        bms = {repo[r].rev() for r in repo._bookmarks.values()}
    bms -= {node.nullrev}
    return subset & bms


@predicate('branch(string or set)', safe=True, weight=10)
def branch(repo, subset, x):
    """
    All changesets belonging to the given branch or the branches of the given
    changesets.

            return getbi(r)[0]
        except error.WdirUnsupported:
            return repo[r].branch()

    try:
        b = getstring(x, '')
    except error.ParseError:
        # not a string, but another revspec, e.g. tip()
        pass
    else:
        kind, pattern, matcher = stringutil.stringmatcher(b)
        if kind == 'literal':
            # note: falls through to the revspec case if no branch with
            # this name exists and pattern kind is not specified explicitly
            if repo.branchmap().hasbranch(pattern):
                return subset.filter(
                    lambda r: matcher(getbranch(r)), condrepr=('<branch %r>', b)
                )
            if b.startswith('literal:'):
                raise error.RepoLookupError(
                    _("branch '%s' does not exist") % pattern
                )
        else:
            return subset.filter(
                lambda r: matcher(getbranch(r)), condrepr=('<branch %r>', b)
            )

    s = getset(repo, fullreposet(repo), x)
    b = set()
    for r in s:
        b.add(getbranch(r))
    c = s.__contains__
    return subset.filter(
        lambda r: c(r) or getbranch(r) in b,
        condrepr=lambda: '<branch %r>' % _sortedb(b),
    )


@predicate('phasedivergent()', safe=True)
def phasedivergent(repo, subset, x):
    """Mutable changesets marked as successors of public changesets.

    Only non-public and non-obsolete changesets can be `phasedivergent`.
    (EXPERIMENTAL)
    """
    # i18n: "phasedivergent" is a keyword
    getargs(x, 0, 0, _("phasedivergent takes no arguments"))
    phasedivergent = obsmod.getrevs(repo, 'phasedivergent')
    return subset & phasedivergent


@predicate('bundle()', safe=True)
def bundle(repo, subset, x):
    """Changesets in the bundle.

    Bundle must be specified by the -R option."""

    try:
        bundlerevs = repo.changelog.bundlerevs
    except AttributeError:
        raise error.Abort(_("no bundle provided - specify with -R"))
    return subset & bundlerevs


def checkstatus(repo, subset, pat, field):
    """Helper for status-related revsets (adds, removes, modifies).
    The field parameter says which kind is desired:
    0: modified
    1: added
    2: removed
    """
    hasset = matchmod.patkind(pat) == 'set'

    mcache = [None]

    def matches(x):
        c = repo[x]

        else:
            for f in files:
                if m(f):
                    return True

    return subset.filter(matches, condrepr=('<status[%r] %r>', field, pat))


def _children(repo, subset, parentset):
    if not parentset:
        return baseset()

        if p2 != nullrev and p2 in parentset:
            cs.add(r)
    return baseset(cs)


@predicate('children(set)', safe=True)
def children(repo, subset, x):
    """Child changesets of changesets in set.
    """
    s = getset(repo, fullreposet(repo), x)
    cs = _children(repo, subset, s)
    return subset & cs


@predicate('closed()', safe=True, weight=10)
def closed(repo, subset, x):
    """Changeset is closed.
    """
    # i18n: "closed" is a keyword
    getargs(x, 0, 0, _("closed takes no arguments"))
    return subset.filter(
        lambda r: repo[r].closesbranch(), condrepr='<branch closed>'
    )


# for internal use
@predicate('_commonancestorheads(set)', safe=True)
def _commonancestorheads(repo, subset, x):
    # This is an internal method is for quickly calculating "heads(::x and
    # ::y)"

    # These greatest common ancestors are the same ones that the consensus bid

    ancs = repo.changelog._commonancestorsheads(*list(startrevs))
    return subset & baseset(ancs)


@predicate('commonancestors(set)', safe=True)
def commonancestors(repo, subset, x):
    """Changesets that are ancestors of every changeset in set.
    """
    startrevs = getset(repo, fullreposet(repo), x, order=anyorder)
    if not startrevs:

    for r in startrevs:
        subset &= dagop.revancestors(repo, baseset([r]))
    return subset


@predicate('contains(pattern)', weight=100)
def contains(repo, subset, x):
    """The revision's manifest contains a file matching pattern (but might not
    modify it). See :hg:`help patterns` for information about file patterns.

    The pattern without explicit kind like ``glob:`` is expected to be
    relative to the current directory and match against a file exactly
    for efficiency.
    """
    # i18n: "contains" is a keyword
    pat = getstring(x, _("contains requires a pattern"))

    def matches(x):
        if not matchmod.patkind(pat):
            pats = pathutil.canonpath(repo.root, repo.getcwd(), pat)
            if pats in repo[x]:

            for f in c.manifest():
                if m(f):
                    return True
        return False

    return subset.filter(matches, condrepr=('<contains %r>', pat))


@predicate('converted([id])', safe=True)
def converted(repo, subset, x):
    """Changesets converted from the given identifier in the old repository if
    present, or all converted changesets if no identifier is specified.
    """

    # There is exactly no chance of resolving the revision, so do a simple
    # string compare and hope for the best

    rev = None
    # i18n: "converted" is a keyword
    l = getargs(x, 0, 1, _('converted takes one or no arguments'))
    if l:
        # i18n: "converted" is a keyword
        rev = getstring(l[0], _('converted requires a revision'))

    def _matchvalue(r):
        source = repo[r].extra().get('convert_revision', None)
        return source is not None and (rev is None or source.startswith(rev))

    return subset.filter(
        lambda r: _matchvalue(r), condrepr=('<converted %r>', rev)
    )


@predicate('date(interval)', safe=True, weight=10)
def date(repo, subset, x):
    """Changesets within the interval, see :hg:`help dates`.
    """
    # i18n: "date" is a keyword
    ds = getstring(x, _("date requires a string"))
    dm = dateutil.matchdate(ds)
    return subset.filter(
        lambda x: dm(repo[x].date()[0]), condrepr=('<date %r>', ds)
    )


@predicate('desc(string)', safe=True, weight=10)
def desc(repo, subset, x):
    """Search commit message for string. The match is case-insensitive.

    Pattern matching is supported for `string`. See
    :hg:`help revisions.patterns`.
    """
    # i18n: "desc" is a keyword
    ds = getstring(x, _("desc requires a string"))

    kind, pattern, matcher = _substringmatcher(ds, casesensitive=False)

    return subset.filter(
        lambda r: matcher(repo[r].description()), condrepr=('<desc %r>', ds)
    )


def _descendants(
    repo, subset, x, followfirst=False, startdepth=None, stopdepth=None

        return baseset()
    s = dagop.revdescendants(repo, roots, followfirst, startdepth, stopdepth)
    return subset & s


@predicate('descendants(set[, depth])', safe=True)
def descendants(repo, subset, x):
    """Changesets which are descendants of changesets in set, including the
    given changesets themselves.

    If depth is specified, the result only includes changesets up to
    the specified generation.
    """
    # startdepth is for internal use only until we can decide the UI
    args = getargsdict(x, 'descendants', 'set depth startdepth')
    if 'set' not in args:
        # i18n: "descendants" is a keyword
        raise error.ParseError(_('descendants takes at least 1 argument'))
    startdepth = stopdepth = None
    if 'startdepth' in args:
        n = getinteger(
            args['startdepth'], "descendants expects an integer startdepth"
        )
        if n < 0:
            raise error.ParseError("negative startdepth")
        startdepth = n
    if 'depth' in args:
        # i18n: "descendants" is a keyword
        n = getinteger(args['depth'], _("descendants expects an integer depth"))
        if n < 0:
            raise error.ParseError(_("negative depth"))
        stopdepth = n + 1
    return _descendants(
        repo, subset, args['set'], startdepth=startdepth, stopdepth=stopdepth
    )


@predicate('_firstdescendants', safe=True)
def _firstdescendants(repo, subset, x):
    # ``_firstdescendants(set)``
    # Like ``descendants(set)`` but follows only the first parents.
    return _descendants(repo, subset, x, followfirst=True)


@predicate('destination([set])', safe=True, weight=10)
def destination(repo, subset, x):
    """Changesets that were created by a graft, transplant or rebase operation,
    with the given revisions specified as the source.  Omitting the optional set
    is the same as passing all().
    """

            r = src
            src = _getrevsource(repo, r)

    return subset.filter(
        dests.__contains__,
        condrepr=lambda: '<destination %r>' % _sortedb(dests),
    )


@predicate('contentdivergent()', safe=True)
def contentdivergent(repo, subset, x):
    """
    Final successors of changesets with an alternative set of final
    successors. (EXPERIMENTAL)
    """
    # i18n: "contentdivergent" is a keyword
    getargs(x, 0, 0, _("contentdivergent takes no arguments"))
    contentdivergent = obsmod.getrevs(repo, 'contentdivergent')
    return subset & contentdivergent


@predicate('expectsize(set[, size])', safe=True, takeorder=True)
def expectsize(repo, subset, x, order):
    """Return the given revset if size matches the revset size.
    Abort if the revset doesn't expect given size.
    size can either be an integer range or an integer.

    For example, ``expectsize(0:1, 3:5)`` will abort as revset size is 2 and
    2 is not between 3 and 5 inclusive."""

    args = getargsdict(x, 'expectsize', 'set size')
    minsize = 0
    maxsize = len(repo) + 1
    err = ''
    if 'size' not in args or 'set' not in args:
        raise error.ParseError(_('invalid set of arguments'))
    minsize, maxsize = getintrange(
        args['size'],
        _('expectsize requires a size range' ' or a positive integer'),
        _('size range bounds must be integers'),
        minsize,
        maxsize,
    )
    if minsize < 0 or maxsize < 0:
        raise error.ParseError(_('negative size'))
    rev = getset(repo, fullreposet(repo), args['set'], order=order)
    if minsize != maxsize and (len(rev) < minsize or len(rev) > maxsize):
        err = _(
            'revset size mismatch.' ' expected between %d and %d, got %d'
        ) % (minsize, maxsize, len(rev))
    elif minsize == maxsize and len(rev) != minsize:
        err = _('revset size mismatch.' ' expected %d, got %d') % (
            minsize,
            len(rev),
        )
    if err:
        raise error.RepoLookupError(err)

        return subset & rev
    else:
        return rev & subset


@predicate('extdata(source)', safe=False, weight=100)
def extdata(repo, subset, x):
    """Changesets in the specified extdata source. (EXPERIMENTAL)"""
    # i18n: "extdata" is a keyword
    args = getargsdict(x, 'extdata', 'source')
    source = getstring(
        args.get('source'),
        # i18n: "extdata" is a keyword
        _('extdata takes at least 1 string argument'),
    )
    data = scmutil.extdatasource(repo, source)
    return subset & baseset(data)


@predicate('extinct()', safe=True)
def extinct(repo, subset, x):
    """Obsolete changesets with obsolete descendants only.
    """
    # i18n: "extinct" is a keyword
    getargs(x, 0, 0, _("extinct takes no arguments"))
    extincts = obsmod.getrevs(repo, 'extinct')
    return subset & extincts


@predicate('extra(label, [value])', safe=True)
def extra(repo, subset, x):
    """Changesets with the given label in the extra metadata, with the given
    optional value.

    Pattern matching is supported for `value`. See
    :hg:`help revisions.patterns`.
    """
    args = getargsdict(x, 'extra', 'label value')
    if 'label' not in args:
        # i18n: "extra" is a keyword
        raise error.ParseError(_('extra takes at least 1 argument'))
    # i18n: "extra" is a keyword
    label = getstring(
        args['label'], _('first argument to extra must be ' 'a string')
    )
    value = None

    if 'value' in args:
        # i18n: "extra" is a keyword
        value = getstring(
            args['value'], _('second argument to extra must be ' 'a string')
        )
        kind, value, matcher = stringutil.stringmatcher(value)

    def _matchvalue(r):
        extra = repo[r].extra()
        return label in extra and (value is None or matcher(extra[label]))

    return subset.filter(
        lambda r: _matchvalue(r), condrepr=('<extra[%r] %r>', label, value)
    )


@predicate('filelog(pattern)', safe=True)
def filelog(repo, subset, x):
    """Changesets connected to the specified filelog.

    For performance reasons, visits only revisions mentioned in the file-level
    filelog, rather than filtering through all changesets (much faster, but

    relative to the current directory and match against a file exactly
    for efficiency.
    """

    # i18n: "filelog" is a keyword
    pat = getstring(x, _("filelog requires a pattern"))
    s = set()
    cl = repo.changelog

    if not matchmod.patkind(pat):
        f = pathutil.canonpath(repo.root, repo.getcwd(), pat)

                            continue

    return subset & s


@predicate('first(set, [n])', safe=True, takeorder=True, weight=0)
def first(repo, subset, x, order):
    """An alias for limit().
    """
    return limit(repo, subset, x, order)


def _follow(repo, subset, x, name, followfirst=False):
    args = getargsdict(x, name, 'file startrev')
    revs = None
    if 'startrev' in args:
        revs = getset(repo, fullreposet(repo), args['startrev'])
    if 'file' in args:
        x = getstring(args['file'], _("%s expected a pattern") % name)
        if revs is None:
            revs = [None]
        fctxs = []
        for r in revs:
            ctx = mctx = repo[r]
            if r is None:
                ctx = repo['.']
            m = matchmod.match(
                repo.root, repo.getcwd(), [x], ctx=mctx, default='path'
            )
            fctxs.extend(ctx[f].introfilectx() for f in ctx.manifest().walk(m))
        s = dagop.filerevancestors(fctxs, followfirst)
    else:
        if revs is None:
            revs = baseset([repo['.'].rev()])
        s = dagop.revancestors(repo, revs, followfirst)

    return subset & s


@predicate('follow([file[, startrev]])', safe=True)
def follow(repo, subset, x):
    """
    An alias for ``::.`` (ancestors of the working directory's first parent).
    If file pattern is specified, the histories of files matching given
    pattern in the revision given by startrev are followed, including copies.
    """
    return _follow(repo, subset, x, 'follow')


@predicate('_followfirst', safe=True)
def _followfirst(repo, subset, x):
    # ``followfirst([file[, startrev]])``
    # Like ``follow([file[, startrev]])`` but follows only the first parent
    # of every revisions or files revisions.
    return _follow(repo, subset, x, '_followfirst', followfirst=True)


@predicate(
    'followlines(file, fromline:toline[, startrev=., descend=False])', safe=True
)
def followlines(repo, subset, x):
    """Changesets modifying `file` in line range ('fromline', 'toline').

    Line range corresponds to 'file' content at 'startrev' and should hence be

    By default, ancestors of 'startrev' are returned. If 'descend' is True,
    descendants of 'startrev' are returned though renames are (currently) not
    followed in this direction.
    """
    args = getargsdict(x, 'followlines', 'file *lines startrev descend')
    if len(args['lines']) != 1:
        raise error.ParseError(_("followlines requires a line range"))

    rev = '.'
    if 'startrev' in args:
        revs = getset(repo, fullreposet(repo), args['startrev'])
        if len(revs) != 1:
            raise error.ParseError(
                # i18n: "followlines" is a keyword
                _("followlines expects exactly one revision")
            )
        rev = revs.last()

    pat = getstring(args['file'], _("followlines requires a pattern"))
    # i18n: "followlines" is a keyword
    msg = _("followlines expects exactly one file")
    fname = scmutil.parsefollowlinespattern(repo, rev, pat, msg)
    fromline, toline = util.processlinerange(
        *getintrange(
            args['lines'][0],
            # i18n: "followlines" is a keyword
            _("followlines expects a line number or a range"),
            _("line range bounds must be integers"),
        )
    )

    fctx = repo[rev].filectx(fname)
    descend = False
    if 'descend' in args:
        descend = getboolean(
            args['descend'],
            # i18n: "descend" is a keyword
            _("descend argument must be a boolean"),
        )
    if descend:
        rs = generatorset(
            (
                c.rev()

            iterasc=False,
        )
    return subset & rs


@predicate('all()', safe=True)
def getall(repo, subset, x):
    """All changesets, the same as ``0:tip``.
    """
    # i18n: "all" is a keyword
    getargs(x, 0, 0, _("all takes no arguments"))
    return subset & spanset(repo)  # drop "null" if any


@predicate('grep(regex)', weight=10)
def grep(repo, subset, x):
    """Like ``keyword(string)`` but accepts a regex. Use ``grep(r'...')``
    to ensure special escape characters are handled correctly. Unlike
    ``keyword(string)``, the match is case-sensitive.
    """
    try:
        # i18n: "grep" is a keyword
        gr = re.compile(getstring(x, _("grep requires a string")))
    except re.error as e:
        raise error.ParseError(
            _('invalid match pattern: %s') % stringutil.forcebytestr(e)
        )

    def matches(x):
        c = repo[x]
        for e in c.files() + [c.user(), c.description()]:
            if gr.search(e):
                return True
        return False

    return subset.filter(matches, condrepr=('<grep %r>', gr.pattern))


@predicate('_matchfiles', safe=True)
def _matchfiles(repo, subset, x):
    # _matchfiles takes a revset list of prefixed arguments:
    #
    #   [p:foo, i:bar, x:baz]
    #

    # a revision identifier, or the empty string to reference the
    # working directory, from which the match object is
    # initialized. Use 'd:' to set the default matching mode, default
    # to 'glob'. At most one 'r:' and 'd:' argument can be passed.

    l = getargs(x, 1, -1, "_matchfiles requires at least one argument")
    pats, inc, exc = [], [], []
    rev, default = None, None
    for arg in l:
        s = getstring(arg, "_matchfiles requires string arguments")
        prefix, value = s[:2], s[2:]
        if prefix == 'p:':
            pats.append(value)
        elif prefix == 'i:':
            inc.append(value)
        elif prefix == 'x:':
            exc.append(value)
        elif prefix == 'r:':
            if rev is not None:
                raise error.ParseError(
                    '_matchfiles expected at most one ' 'revision'
                )
            if value == '':  # empty means working directory
                rev = node.wdirrev
            else:
                rev = value
        elif prefix == 'd:':
            if default is not None:
                raise error.ParseError(
                    '_matchfiles expected at most one ' 'default mode'
                )
            default = value
        else:
            raise error.ParseError('invalid _matchfiles prefix: %s' % prefix)
    if not default:
        default = 'glob'
    hasset = any(matchmod.patkind(p) == 'set' for p in pats + inc + exc)

    mcache = [None]

    # This directly read the changelog data as creating changectx for all
    # revisions is quite expensive.

        return False

    return subset.filter(
        matches,
        condrepr=(
            '<matchfiles patterns=%r, include=%r '
            'exclude=%r, default=%r, rev=%r>',
            pats,
            inc,
            exc,
            default,
            rev,
        ),
    )


@predicate('file(pattern)', safe=True, weight=10)
def hasfile(repo, subset, x):
    """Changesets affecting files matched by pattern.

    For a faster but less accurate result, consider using ``filelog()``
    instead.

    This predicate uses ``glob:`` as the default kind of pattern.
    """
    # i18n: "file" is a keyword
    pat = getstring(x, _("file requires a pattern"))
    return _matchfiles(repo, subset, ('string', 'p:' + pat))


@predicate('head()', safe=True)
def head(repo, subset, x):
    """Changeset is a named branch head.
    """
    # i18n: "head" is a keyword
    getargs(x, 0, 0, _("head takes no arguments"))
    hs = set()
    cl = repo.changelog
    for ls in repo.branchmap().iterheads():
        hs.update(cl.rev(h) for h in ls)
    return subset & baseset(hs)


@predicate('heads(set)', safe=True, takeorder=True)
def heads(repo, subset, x, order):
    """Members of set with no children in set.
    """
    # argument set should never define order
    if order == defineorder:

        heads.add(node.wdirrev)
    heads = baseset(heads)
    return subset & heads


@predicate('hidden()', safe=True)
def hidden(repo, subset, x):
    """Hidden changesets.
    """
    # i18n: "hidden" is a keyword
    getargs(x, 0, 0, _("hidden takes no arguments"))
    hiddenrevs = repoview.filterrevs(repo, 'visible')
    return subset & hiddenrevs


@predicate('keyword(string)', safe=True, weight=10)
def keyword(repo, subset, x):
    """Search commit message, user name, and names of changed files for
    string. The match is case-insensitive.

    For a regular expression or case sensitive search of these fields, use
    ``grep(regex)``.
    """
    # i18n: "keyword" is a keyword
    kw = encoding.lower(getstring(x, _("keyword requires a string")))

    def matches(r):
        c = repo[r]
        return any(
            kw in encoding.lower(t)
            for t in c.files() + [c.user(), c.description()]
        )

    return subset.filter(matches, condrepr=('<keyword %r>', kw))


@predicate('limit(set[, n[, offset]])', safe=True, takeorder=True, weight=0)
def limit(repo, subset, x, order):
    """First n members of set, defaulting to 1, starting from offset.
    """
    args = getargsdict(x, 'limit', 'set n offset')
    if 'set' not in args:
        # i18n: "limit" is a keyword
        raise error.ParseError(_("limit requires one to three arguments"))
    # i18n: "limit" is a keyword
    lim = getinteger(args.get('n'), _("limit expects a number"), default=1)
    if lim < 0:
        raise error.ParseError(_("negative number to select"))
    # i18n: "limit" is a keyword
    ofs = getinteger(args.get('offset'), _("limit expects a number"), default=0)
    if ofs < 0:
        raise error.ParseError(_("negative offset"))
    os = getset(repo, fullreposet(repo), args['set'])
    ls = os.slice(ofs, ofs + lim)
    if order == followorder and lim > 1:
        return subset & ls
    return ls & subset


@predicate('last(set, [n])', safe=True, takeorder=True)
def last(repo, subset, x, order):
    """Last n members of set, defaulting to 1.
    """
    # i18n: "last" is a keyword
    l = getargs(x, 1, 2, _("last requires one or two arguments"))
    lim = 1
    if len(l) == 2:
        # i18n: "last" is a keyword
        lim = getinteger(l[1], _("last expects a number"))
    if lim < 0:
        raise error.ParseError(_("negative number to select"))
    os = getset(repo, fullreposet(repo), l[0])
    os.reverse()
    ls = os.slice(0, lim)
    if order == followorder and lim > 1:
        return subset & ls
    ls.reverse()
    return ls & subset


@predicate('max(set)', safe=True)
def maxrev(repo, subset, x):
    """Changeset with highest revision number in set.
    """
    os = getset(repo, fullreposet(repo), x)
    try:
        m = os.max()
        if m in subset:
            return baseset([m], datarepr=('<max %r, %r>', subset, os))
    except ValueError:
        # os.max() throws a ValueError when the collection is empty.
        # Same as python's max().
        pass
    return baseset(datarepr=('<max %r, %r>', subset, os))


@predicate('merge()', safe=True)
def merge(repo, subset, x):
    """Changeset is a merge changeset.
    """
    # i18n: "merge" is a keyword
    getargs(x, 0, 0, _("merge takes no arguments"))
    cl = repo.changelog
    nullrev = node.nullrev

    def ismerge(r):
        try:
            return cl.parentrevs(r)[1] != nullrev
        except error.WdirUnsupported:
            return bool(repo[r].p2())

    return subset.filter(ismerge, condrepr='<merge>')


@predicate('branchpoint()', safe=True)
def branchpoint(repo, subset, x):
    """Changesets with more than one child.
    """
    # i18n: "branchpoint" is a keyword
    getargs(x, 0, 0, _("branchpoint takes no arguments"))
    cl = repo.changelog
    if not subset:
        return baseset()
    # XXX this should be 'parentset.min()' assuming 'parentset' is a smartset
    # (and if it is not, it should.)

    for r in cl.revs(start=baserev + 1):
        for p in cl.parentrevs(r):
            if p >= baserev:
                parentscount[p - baserev] += 1
    return subset.filter(
        lambda r: parentscount[r - baserev] > 1, condrepr='<branchpoint>'
    )


@predicate('min(set)', safe=True)
def minrev(repo, subset, x):
    """Changeset with lowest revision number in set.
    """
    os = getset(repo, fullreposet(repo), x)
    try:
        m = os.min()
        if m in subset:
            return baseset([m], datarepr=('<min %r, %r>', subset, os))
    except ValueError:
        # os.min() throws a ValueError when the collection is empty.
        # Same as python's min().
        pass
    return baseset(datarepr=('<min %r, %r>', subset, os))


@predicate('modifies(pattern)', safe=True, weight=30)
def modifies(repo, subset, x):
    """Changesets modifying files matched by pattern.

    The pattern without explicit kind like ``glob:`` is expected to be
    relative to the current directory and match against a file or a
    directory.
    """
    # i18n: "modifies" is a keyword
    pat = getstring(x, _("modifies requires a pattern"))
    return checkstatus(repo, subset, pat, 0)


@predicate('named(namespace)')
def named(repo, subset, x):
    """The changesets in a given namespace.

    Pattern matching is supported for `namespace`. See
    :hg:`help revisions.patterns`.
    """
    # i18n: "named" is a keyword
    args = getargs(x, 1, 1, _('named requires a namespace argument'))

    ns = getstring(
        args[0],
        # i18n: "named" is a keyword
        _('the argument to named must be a string'),
    )
    kind, pattern, matcher = stringutil.stringmatcher(ns)
    namespaces = set()
    if kind == 'literal':
        if pattern not in repo.names:
            raise error.RepoLookupError(_("namespace '%s' does not exist") % ns)
        namespaces.add(repo.names[pattern])
    else:
        for name, ns in repo.names.iteritems():
            if matcher(name):
                namespaces.add(ns)

    names -= {node.nullrev}
    return subset & names


@predicate('id(string)', safe=True)
def node_(repo, subset, x):
    """Revision non-ambiguously specified by the given hex string prefix.
    """
    # i18n: "id" is a keyword
    l = getargs(x, 1, 1, _("id requires one argument"))
    # i18n: "id" is a keyword
    n = getstring(l[0], _("id requires a string"))
    if len(n) == 40:
        try:
            rn = repo.changelog.rev(node.bin(n))
        except error.WdirUnsupported:
            rn = node.wdirrev

        return baseset()
    result = baseset([rn])
    return result & subset


@predicate('none()', safe=True)
def none(repo, subset, x):
    """No changesets.
    """
    # i18n: "none" is a keyword
    getargs(x, 0, 0, _("none takes no arguments"))
    return baseset()


@predicate('obsolete()', safe=True)
def obsolete(repo, subset, x):
    """Mutable changeset with a newer version."""
    # i18n: "obsolete" is a keyword
    getargs(x, 0, 0, _("obsolete takes no arguments"))
    obsoletes = obsmod.getrevs(repo, 'obsolete')
    return subset & obsoletes


@predicate('only(set, [set])', safe=True)
def only(repo, subset, x):
    """Changesets that are ancestors of the first set that are not ancestors
    of any other head in the repo. If a second set is specified, the result
    is ancestors of the first set that are not ancestors of the second set
    (i.e. ::<set1> - ::<set2>).
    """
    cl = repo.changelog
    # i18n: "only" is a keyword
    args = getargs(x, 1, 2, _('only takes one or two arguments'))
    include = getset(repo, fullreposet(repo), args[0])
    if len(args) == 1:
        if not include:
            return baseset()

    # XXX we should turn this into a baseset instead of a set, smartset may do
    # some optimizations from the fact this is a baseset.
    return subset & results


@predicate('origin([set])', safe=True)
def origin(repo, subset, x):
    """
    Changesets that were specified as a source for the grafts, transplants or
    rebases that created the given revisions.  Omitting the optional set is the
    same as passing all().  If a changeset created by these operations is itself

    # XXX we should turn this into a baseset instead of a set, smartset may do
    # some optimizations from the fact this is a baseset.
    return subset & o


@predicate('outgoing([path])', safe=False, weight=10)
def outgoing(repo, subset, x):
    """Changesets not found in the specified destination repository, or the
    default push location.
    """
    # Avoid cycles.

        discovery,
        hg,
    )

    # i18n: "outgoing" is a keyword
    l = getargs(x, 0, 1, _("outgoing takes one or no arguments"))
    # i18n: "outgoing" is a keyword
    dest = l and getstring(l[0], _("outgoing requires a repository path")) or ''
    if not dest:
        # ui.paths.getpath() explicitly tests for None, not just a boolean
        dest = None
    path = repo.ui.paths.getpath(dest, default=('default-push', 'default'))
    if not path:
        raise error.Abort(
            _('default repository not configured!'),
            hint=_("see 'hg help config.paths'"),
        )
    dest = path.pushloc or path.loc
    branches = path.branch, []

    revs, checkout = hg.addbranchrevs(repo, repo, branches, [])

    cl = repo.changelog
    o = {cl.rev(r) for r in outgoing.missing}
    return subset & o


@predicate('p1([set])', safe=True)
def p1(repo, subset, x):
    """First parent of changesets in set, or the working directory.
    """
    if x is None:
        p = repo[x].p1().rev()

    # XXX we should turn this into a baseset instead of a set, smartset may do
    # some optimizations from the fact this is a baseset.
    return subset & ps


@predicate('p2([set])', safe=True)
def p2(repo, subset, x):
    """Second parent of changesets in set, or the working directory.
    """
    if x is None:
        ps = repo[x].parents()

def parentpost(repo, subset, x, order):
    return p1(repo, subset, x)


@predicate('parents([set])', safe=True)
def parents(repo, subset, x):
    """
    The set of all parents for all changesets in set, or the working directory.
    """
    if x is None:

def _phase(repo, subset, *targets):
    """helper to select all rev in <targets> phases"""
    return repo._phasecache.getrevset(repo, targets, subset)


@predicate('_phase(idx)', safe=True)
def phase(repo, subset, x):
    l = getargs(x, 1, 1, "_phase requires one argument")
    target = getinteger(l[0], "_phase expects a number")
    return _phase(repo, subset, target)


@predicate('draft()', safe=True)
def draft(repo, subset, x):
    """Changeset in draft phase."""
    # i18n: "draft" is a keyword
    getargs(x, 0, 0, _("draft takes no arguments"))
    target = phases.draft
    return _phase(repo, subset, target)


@predicate('secret()', safe=True)
def secret(repo, subset, x):
    """Changeset in secret phase."""
    # i18n: "secret" is a keyword
    getargs(x, 0, 0, _("secret takes no arguments"))
    target = phases.secret
    return _phase(repo, subset, target)


@predicate('stack([revs])', safe=True)
def stack(repo, subset, x):
    """Experimental revset for the stack of changesets or working directory
    parent. (EXPERIMENTAL)
    """
    if x is None:

    try:
        n = int(n[1])
        if n not in (0, 1, 2):
            raise ValueError
    except (TypeError, ValueError):
        raise error.ParseError(_("^ expects a number 0, 1, or 2"))
    ps = set()
    cl = repo.changelog
    for r in getset(repo, fullreposet(repo), x):
        if n == 0:
            ps.add(r)

                if len(parents) == 2:
                    ps.add(parents[1].rev())
    return subset & ps


@predicate('present(set)', safe=True, takeorder=True)
def present(repo, subset, x, order):
    """An empty set, if any revision in set isn't found; otherwise,
    all revisions in set.

    If any of specified revisions is not present in the local repository,

    except error.RepoLookupError:
        return baseset()


# for internal use
@predicate('_notpublic', safe=True)
def _notpublic(repo, subset, x):
    getargs(x, 0, 0, "_notpublic takes no arguments")
    return _phase(repo, subset, phases.draft, phases.secret)


# for internal use
@predicate('_phaseandancestors(phasename, set)', safe=True)
def _phaseandancestors(repo, subset, x):
    # equivalent to (phasename() & ancestors(set)) but more efficient
    # phasename could be one of 'draft', 'secret', or '_notpublic'
    args = getargs(x, 2, 2, "_phaseandancestors requires two arguments")
    phasename = getsymbol(args[0])
    s = getset(repo, fullreposet(repo), args[1])

    draft = phases.draft
    secret = phases.secret
    phasenamemap = {
        '_notpublic': draft,
        'draft': draft,  # follow secret's ancestors
        'secret': secret,
    }
    if phasename not in phasenamemap:
        raise error.ParseError('%r is not a valid phasename' % phasename)

    minimalphase = phasenamemap[phasename]
    getphase = repo._phasecache.phase

    def cutfunc(rev):
        return getphase(repo, rev) < minimalphase

    revs = dagop.revancestors(repo, s, cutfunc=cutfunc)

    if phasename == 'draft':  # need to remove secret changesets
        revs = revs.filter(lambda r: getphase(repo, r) == draft)
    return subset & revs


@predicate('public()', safe=True)
def public(repo, subset, x):
    """Changeset in public phase."""
    # i18n: "public" is a keyword
    getargs(x, 0, 0, _("public takes no arguments"))
    return _phase(repo, subset, phases.public)


@predicate('remote([id [,path]])', safe=False)
def remote(repo, subset, x):
    """Local revision that corresponds to the given identifier in a
    remote repository, if present. Here, the '.' identifier is a
    synonym for the current local branch.
    """

    from . import hg  # avoid start-up nasties

    # i18n: "remote" is a keyword
    l = getargs(x, 0, 2, _("remote takes zero, one, or two arguments"))

    q = '.'
    if len(l) > 0:
        # i18n: "remote" is a keyword
        q = getstring(l[0], _("remote requires a string id"))
    if q == '.':
        q = repo['.'].branch()

    dest = ''
    if len(l) > 1:
        # i18n: "remote" is a keyword
        dest = getstring(l[1], _("remote requires a repository path"))
    dest = repo.ui.expandpath(dest or 'default')
    dest, branches = hg.parseurl(dest)
    revs, checkout = hg.addbranchrevs(repo, repo, branches, [])
    if revs:
        revs = [repo.lookup(rev) for rev in revs]
    other = hg.peer(repo, {}, dest)

        if r in subset:
            return baseset([r])
    return baseset()


@predicate('removes(pattern)', safe=True, weight=30)
def removes(repo, subset, x):
    """Changesets which remove files matching pattern.

    The pattern without explicit kind like ``glob:`` is expected to be
    relative to the current directory and match against a file or a
    directory.
    """
    # i18n: "removes" is a keyword
    pat = getstring(x, _("removes requires a pattern"))
    return checkstatus(repo, subset, pat, 2)


@predicate('rev(number)', safe=True)
def rev(repo, subset, x):
    """Revision with the given numeric identifier.
    """
    # i18n: "rev" is a keyword
    l = getargs(x, 1, 1, _("rev requires one argument"))
    try:
        # i18n: "rev" is a keyword
        l = int(getstring(l[0], _("rev requires a number")))
    except (TypeError, ValueError):
        # i18n: "rev" is a keyword
        raise error.ParseError(_("rev expects a number"))
    if l not in repo.changelog and l not in _virtualrevs:
        return baseset()
    return subset & baseset([l])


@predicate('_rev(number)', safe=True)
def _rev(repo, subset, x):
    # internal version of "rev(x)" that raise error if "x" is invalid
    # i18n: "rev" is a keyword
    l = getargs(x, 1, 1, _("rev requires one argument"))
    try:
        # i18n: "rev" is a keyword
        l = int(getstring(l[0], _("rev requires a number")))
    except (TypeError, ValueError):
        # i18n: "rev" is a keyword
        raise error.ParseError(_("rev expects a number"))
    repo.changelog.node(l)  # check that the rev exists
    return subset & baseset([l])


@predicate('revset(set)', safe=True, takeorder=True)
def revsetpredicate(repo, subset, x, order):
    """Strictly interpret the content as a revset.

    The content of this special predicate will be strictly interpreted as a
    revset. For example, ``revset(id(0))`` will be interpreted as "id(0)"
    without possible ambiguity with a "id(0)" bookmark or tag.
    """
    return getset(repo, subset, x, order)


@predicate('matching(revision [, field])', safe=True)
def matching(repo, subset, x):
    """Changesets in which a given set of fields match the set of fields in the
    selected revision or set.

    To match more than one field pass the list of fields to match separated

    ``metadata`` is the default field which is used when no fields are
    specified. You can match more than one field at a time.
    """
    # i18n: "matching" is a keyword
    l = getargs(x, 1, 2, _("matching takes 1 or 2 arguments"))

    revs = getset(repo, fullreposet(repo), l[0])

    fieldlist = ['metadata']
    if len(l) > 1:
        fieldlist = getstring(
            l[1],
            # i18n: "matching" is a keyword
            _("matching requires a string " "as its second argument"),
        ).split()

    # Make sure that there are no repeated fields,
    # expand the 'special' 'metadata' field type
    # and check the 'files' whenever we check the 'diff'
    fields = []
    for field in fieldlist:
        if field == 'metadata':
            fields += ['user', 'description', 'date']
        elif field == 'diff':
            # a revision matching the diff must also match the files
            # since matching the diff is very costly, make sure to
            # also match the files first
            fields += ['files', 'diff']
        else:
            if field == 'author':
                field = 'user'
            fields.append(field)
    fields = set(fields)
    if 'summary' in fields and 'description' in fields:
        # If a revision matches its description it also matches its summary
        fields.discard('summary')

    # We may want to match more than one field
    # Not all fields take the same amount of time to be matched
    # Sort the selected fields in order of increasing matching cost
    fieldorder = [
        'phase',
        'parents',
        'user',
        'date',
        'branch',
        'summary',
        'files',
        'description',
        'substate',
        'diff',
    ]

    def fieldkeyfunc(f):
        try:
            return fieldorder.index(f)

    # Each field will be matched with its own "getfield" function
    # which will be added to the getfieldfuncs array of functions
    getfieldfuncs = []
    _funcs = {
        'user': lambda r: repo[r].user(),
        'branch': lambda r: repo[r].branch(),
        'date': lambda r: repo[r].date(),
        'description': lambda r: repo[r].description(),
        'files': lambda r: repo[r].files(),
        'parents': lambda r: repo[r].parents(),
        'phase': lambda r: repo[r].phase(),
        'substate': lambda r: repo[r].substate,
        'summary': lambda r: repo[r].description().splitlines()[0],
        'diff': lambda r: list(
            repo[r].diff(opts=diffutil.diffallopts(repo.ui, {'git': True}))
        ),
    }
    for info in fields:
        getfield = _funcs.get(info, None)
        if getfield is None:
            raise error.ParseError(
                # i18n: "matching" is a keyword
                _("unexpected field name passed to matching: %s")
                % info
            )
        getfieldfuncs.append(getfield)
    # convert the getfield array of functions into a "getinfo" function
    # which returns an array of field values (or a single value if there

                    match = False
            if match:
                return True
        return False

    return subset.filter(matches, condrepr=('<matching%r %r>', fields, revs))


@predicate('reverse(set)', safe=True, takeorder=True, weight=0)
def reverse(repo, subset, x, order):
    """Reverse order of set.
    """
    l = getset(repo, subset, x, order)
    if order == defineorder:
        l.reverse()
    return l


@predicate('roots(set)', safe=True)
def roots(repo, subset, x):
    """Changesets in set with no parent changeset in set.
    """
    s = getset(repo, fullreposet(repo), x)
    parents = repo.changelog.parentrevs

        for p in parents(r):
            if 0 <= p and p in s:
                return False
        return True

    return subset & s.filter(filter, condrepr='<roots>')


_sortkeyfuncs = {
    'rev': lambda c: c.rev(),
    'branch': lambda c: c.branch(),
    'desc': lambda c: c.description(),
    'user': lambda c: c.user(),
    'author': lambda c: c.user(),
    'date': lambda c: c.date()[0],
}


def _getsortargs(x):
    """Parse sort options into (set, [(key, reverse)], opts)"""
    args = getargsdict(x, 'sort', 'set keys topo.firstbranch')
    if 'set' not in args:
        # i18n: "sort" is a keyword
        raise error.ParseError(_('sort requires one or two arguments'))
    keys = "rev"
    if 'keys' in args:
        # i18n: "sort" is a keyword
        keys = getstring(args['keys'], _("sort spec must be a string"))

    keyflags = []
    for k in keys.split():
        fk = k
        reverse = k.startswith('-')
        if reverse:
            k = k[1:]
        if k not in _sortkeyfuncs and k != 'topo':
            raise error.ParseError(
                _("unknown sort key %r") % pycompat.bytestr(fk)
            )
        keyflags.append((k, reverse))

    if len(keyflags) > 1 and any(k == 'topo' for k, reverse in keyflags):
        # i18n: "topo" is a keyword
        raise error.ParseError(
            _('topo sort order cannot be combined ' 'with other sort keys')
        )

    opts = {}
    if 'topo.firstbranch' in args:
        if any(k == 'topo' for k, reverse in keyflags):
            opts['topo.firstbranch'] = args['topo.firstbranch']
        else:
            # i18n: "topo" and "topo.firstbranch" are keywords
            raise error.ParseError(
                _(
                    'topo.firstbranch can only be used '
                    'when using the topo sort key'
                )
            )

    return args['set'], keyflags, opts


@predicate(
    'sort(set[, [-]key... [, ...]])', safe=True, takeorder=True, weight=10
)
def sort(repo, subset, x, order):
    """Sort set by keys. The default sort order is ascending, specify a key
    as ``-key`` to sort in descending order.

    s, keyflags, opts = _getsortargs(x)
    revs = getset(repo, subset, s, order)

    if not keyflags or order != defineorder:
        return revs
    if len(keyflags) == 1 and keyflags[0][0] == "rev":
        revs.sort(reverse=keyflags[0][1])
        return revs
    elif keyflags[0][0] == "topo":
        firstbranch = ()
        if 'topo.firstbranch' in opts:
            firstbranch = getset(repo, subset, opts['topo.firstbranch'])
        revs = baseset(
            dagop.toposort(revs, repo.changelog.parentrevs, firstbranch),
            istopo=True,
        )
        if keyflags[0][1]:

    for k, reverse in reversed(keyflags):
        ctxs.sort(key=_sortkeyfuncs[k], reverse=reverse)
    return baseset([c.rev() for c in ctxs])


@predicate('subrepo([pattern])')
def subrepo(repo, subset, x):
    """Changesets that add, modify or remove the given subrepo.  If no subrepo
    pattern is named, any subrepo changes are returned.
    """
    # i18n: "subrepo" is a keyword
    args = getargs(x, 0, 1, _('subrepo takes at most one argument'))
    pat = None
    if len(args) != 0:
        pat = getstring(args[0], _("subrepo requires a pattern"))

    m = matchmod.exact(['.hgsubstate'])

    def submatches(names):
        k, p, m = stringutil.stringmatcher(pat)
        for name in names:
            if m(name):

        if s.removed:
            return any(submatches(c.p1().substate.keys()))

        return False

    return subset.filter(matches, condrepr=('<subrepo %r>', pat))


def _mapbynodefunc(repo, s, f):
    """(repo, smartset, [node] -> [node]) -> smartset

    nodemap = cl.nodemap
    result = set(torev(n) for n in f(tonode(r) for r in s) if n in nodemap)
    return smartset.baseset(result - repo.changelog.filteredrevs)


@predicate('successors(set)', safe=True)
def successors(repo, subset, x):
    """All successors for set, including the given set themselves"""
    s = getset(repo, fullreposet(repo), x)
    f = lambda nodes: obsutil.allsuccessors(repo.obsstore, nodes)
    d = _mapbynodefunc(repo, s, f)

def _substringmatcher(pattern, casesensitive=True):
    kind, pattern, matcher = stringutil.stringmatcher(
        pattern, casesensitive=casesensitive
    )
    if kind == 'literal':
        if not casesensitive:
            pattern = encoding.lower(pattern)
            matcher = lambda s: pattern in encoding.lower(s)
        else:
            matcher = lambda s: pattern in s
    return kind, pattern, matcher


@predicate('tag([name])', safe=True)
def tag(repo, subset, x):
    """The specified tag by name, or all tagged revisions if no name is given.

    Pattern matching is supported for `name`. See
    :hg:`help revisions.patterns`.
    """
    # i18n: "tag" is a keyword
    args = getargs(x, 0, 1, _("tag takes one or no arguments"))
    cl = repo.changelog
    if args:
        pattern = getstring(
            args[0],
            # i18n: "tag" is a keyword
            _('the argument to tag must be a string'),
        )
        kind, pattern, matcher = stringutil.stringmatcher(pattern)
        if kind == 'literal':
            # avoid resolving all tags
            tn = repo._tagscache.tags.get(pattern, None)
            if tn is None:
                raise error.RepoLookupError(
                    _("tag '%s' does not exist") % pattern
                )
            s = {repo[tn].rev()}
        else:
            s = {cl.rev(n) for t, n in repo.tagslist() if matcher(t)}
    else:
        s = {cl.rev(n) for t, n in repo.tagslist() if t != 'tip'}
    return subset & s


@predicate('tagged', safe=True)
def tagged(repo, subset, x):
    return tag(repo, subset, x)


@predicate('orphan()', safe=True)
def orphan(repo, subset, x):
    """Non-obsolete changesets with obsolete ancestors. (EXPERIMENTAL)
    """
    # i18n: "orphan" is a keyword
    getargs(x, 0, 0, _("orphan takes no arguments"))
    orphan = obsmod.getrevs(repo, 'orphan')
    return subset & orphan


@predicate('user(string)', safe=True, weight=10)
def user(repo, subset, x):
    """User name contains string. The match is case-insensitive.

    Pattern matching is supported for `string`. See
    :hg:`help revisions.patterns`.
    """
    return author(repo, subset, x)


@predicate('wdir()', safe=True, weight=0)
def wdir(repo, subset, x):
    """Working directory. (EXPERIMENTAL)"""
    # i18n: "wdir" is a keyword
    getargs(x, 0, 0, _("wdir takes no arguments"))
    if node.wdirrev in subset or isinstance(subset, fullreposet):
        return baseset([node.wdirrev])
    return baseset()


def _orderedlist(repo, subset, x):
    s = getstring(x, "internal error")
    if not s:
        return baseset()
    # remove duplicates here. it's difficult for caller to deduplicate sets
    # because different symbols can point to the same rev.
    cl = repo.changelog
    ls = []
    seen = set()
    for t in s.split('\0'):
        try:
            # fast path for integer revision
            r = int(t)
            if ('%d' % r) != t or r not in cl:
                raise ValueError
            revs = [r]
        except ValueError:
            revs = stringset(repo, subset, t, defineorder)

            seen.add(r)
    return baseset(ls)


# for internal use
@predicate('_list', safe=True, takeorder=True)
def _list(repo, subset, x, order):
    if order == followorder:
        # slow path to take the subset order
        return subset & _orderedlist(repo, fullreposet(repo), x)
    else:
        return _orderedlist(repo, subset, x)


def _orderedintlist(repo, subset, x):
    s = getstring(x, "internal error")
    if not s:
        return baseset()
    ls = [int(r) for r in s.split('\0')]
    s = subset
    return baseset([r for r in ls if r in s])


# for internal use
@predicate('_intlist', safe=True, takeorder=True, weight=0)
def _intlist(repo, subset, x, order):
    if order == followorder:
        # slow path to take the subset order
        return subset & _orderedintlist(repo, fullreposet(repo), x)
    else:
        return _orderedintlist(repo, subset, x)


def _orderedhexlist(repo, subset, x):
    s = getstring(x, "internal error")
    if not s:
        return baseset()
    cl = repo.changelog
    ls = [cl.rev(node.bin(r)) for r in s.split('\0')]
    s = subset
    return baseset([r for r in ls if r in s])


# for internal use
@predicate('_hexlist', safe=True, takeorder=True)
def _hexlist(repo, subset, x, order):
    if order == followorder:
        # slow path to take the subset order
        return subset & _orderedhexlist(repo, fullreposet(repo), x)
    else:
        return _orderedhexlist(repo, subset, x)


methods = {
    "range": rangeset,
    "rangeall": rangeall,
    "rangepre": rangepre,
    "rangepost": rangepost,
    "dagrange": dagrange,
    "string": stringset,
    "symbol": stringset,
    "and": andset,
    "andsmally": andsmallyset,
    "or": orset,
    "not": notset,
    "difference": differenceset,
    "relation": relationset,
    "relsubscript": relsubscriptset,
    "subscript": subscriptset,
    "list": listset,
    "keyvalue": keyvaluepair,
    "func": func,
    "ancestor": ancestorspec,
    "parent": parentspec,
    "parentpost": parentpost,
    "smartset": rawsmartset,
}

subscriptrelations = {
    "g": generationsrel,
    "generations": generationsrel,
}


def lookupfn(repo):
    return lambda symbol: scmutil.isrevsymbol(repo, symbol)

        def mfunc(repo, subset=None):
            return baseset()

        return mfunc
    if not all(specs):
        raise error.ParseError(_("empty query"))
    if len(specs) == 1:
        tree = revsetlang.parse(specs[0], lookup)
    else:
        tree = (
            'or',
            ('list',) + tuple(revsetlang.parse(s, lookup) for s in specs),
        )

    aliases = []
    warn = None
    if ui:
        aliases.extend(ui.configitems('revsetalias'))
        warn = ui.warn
    if localalias:
        aliases.extend(localalias.items())
    if aliases:
        tree = revsetlang.expandaliases(tree, aliases, warn=warn)

43077:687b865b95ad

#           ^^^^^^
#      For most revsets, 'define' means using the order this subset provides
#
# There are a few revsets that always redefine the order if 'define' is
# specified: 'sort(X)', 'reverse(X)', 'x:y'.
anyorder = b'any'  # don't care the order, could be even random-shuffled
defineorder = b'define'  # ALWAYS redefine, or ALWAYS follow the current order
followorder = b'follow'  # MUST follow the current order

# helpers


def getset(repo, subset, x, order=defineorder):
    if not x:
        raise error.ParseError(_(b"missing argument"))
    return methods[x[0]](repo, subset, *x[1:], order=order)


def _getrevsource(repo, r):
    extra = repo[r].extra()
    for label in (b'source', b'transplant_source', b'rebase_source'):
        if label in extra:
            try:
                return repo[extra[label]].rev()
            except error.RepoLookupError:
                pass

# operator methods


def stringset(repo, subset, x, order):
    if not x:
        raise error.ParseError(_(b"empty string is not a valid revision"))
    x = scmutil.intrev(scmutil.revsymbol(repo, x))
    if x in subset or x in _virtualrevs and isinstance(subset, fullreposet):
        return baseset([x])
    return baseset()

def notset(repo, subset, x, order):
    return subset - getset(repo, subset, x, anyorder)


def relationset(repo, subset, x, y, order):
    raise error.ParseError(_(b"can't use a relation in this context"))


def _splitrange(a, b):
    """Split range with bounds a and b into two ranges at 0 and return two
    tuples of numbers for use as startdepth and stopdepth arguments of

def generationsrel(repo, subset, x, rel, z, order):
    # TODO: rewrite tests, and drop startdepth argument from ancestors() and
    # descendants() predicates
    a, b = getintrange(
        z,
        _(b'relation subscript must be an integer or a range'),
        _(b'relation subscript bounds must be integers'),
        deffirst=-(dagop.maxlogdepth - 1),
        deflast=+(dagop.maxlogdepth - 1),
    )
    (ancstart, ancstop), (descstart, descstop) = _splitrange(a, b)

    relnames = [r for r in subscriptrelations.keys() if len(r) > 1]
    raise error.UnknownIdentifier(rel, relnames)


def subscriptset(repo, subset, x, y, order):
    raise error.ParseError(_(b"can't use a subscript in this context"))


def listset(repo, subset, *xs, **opts):
    raise error.ParseError(
        _(b"can't use a list in this context"),
        hint=_(b'see \'hg help "revsets.x or y"\''),
    )


def keyvaluepair(repo, subset, k, v, order):
    raise error.ParseError(_(b"can't use a key-value pair in this context"))


def func(repo, subset, a, b, order):
    f = getsymbol(a)
    if f in symbols:

safesymbols = set()

predicate = registrar.revsetpredicate()


@predicate(b'_destupdate')
def _destupdate(repo, subset, x):
    # experimental revset for update destination
    args = getargsdict(x, b'limit', b'clean')
    return subset & baseset(
        [destutil.destupdate(repo, **pycompat.strkwargs(args))[0]]
    )


@predicate(b'_destmerge')
def _destmerge(repo, subset, x):
    # experimental revset for merge destination
    sourceset = None
    if x is not None:
        sourceset = getset(repo, fullreposet(repo), x)
    return subset & baseset([destutil.destmerge(repo, sourceset=sourceset)])


@predicate(b'adds(pattern)', safe=True, weight=30)
def adds(repo, subset, x):
    """Changesets that add a file matching pattern.

    The pattern without explicit kind like ``glob:`` is expected to be
    relative to the current directory and match against a file or a
    directory.
    """
    # i18n: "adds" is a keyword
    pat = getstring(x, _(b"adds requires a pattern"))
    return checkstatus(repo, subset, pat, 1)


@predicate(b'ancestor(*changeset)', safe=True, weight=0.5)
def ancestor(repo, subset, x):
    """A greatest common ancestor of the changesets.

    Accepts 0 or more changesets.
    Will return empty list when passed no args.

        return baseset()
    s = dagop.revancestors(repo, heads, followfirst, startdepth, stopdepth)
    return subset & s


@predicate(b'ancestors(set[, depth])', safe=True)
def ancestors(repo, subset, x):
    """Changesets that are ancestors of changesets in set, including the
    given changesets themselves.

    If depth is specified, the result only includes changesets up to
    the specified generation.
    """
    # startdepth is for internal use only until we can decide the UI
    args = getargsdict(x, b'ancestors', b'set depth startdepth')
    if b'set' not in args:
        # i18n: "ancestors" is a keyword
        raise error.ParseError(_(b'ancestors takes at least 1 argument'))
    startdepth = stopdepth = None
    if b'startdepth' in args:
        n = getinteger(
            args[b'startdepth'], b"ancestors expects an integer startdepth"
        )
        if n < 0:
            raise error.ParseError(b"negative startdepth")
        startdepth = n
    if b'depth' in args:
        # i18n: "ancestors" is a keyword
        n = getinteger(args[b'depth'], _(b"ancestors expects an integer depth"))
        if n < 0:
            raise error.ParseError(_(b"negative depth"))
        stopdepth = n + 1
    return _ancestors(
        repo, subset, args[b'set'], startdepth=startdepth, stopdepth=stopdepth
    )


@predicate(b'_firstancestors', safe=True)
def _firstancestors(repo, subset, x):
    # ``_firstancestors(set)``
    # Like ``ancestors(set)`` but follows only the first parents.
    return _ancestors(repo, subset, x, followfirst=True)

            c = repo[r].children()
            if len(c) == 0:
                break
            if len(c) > 1:
                raise error.RepoLookupError(
                    _(b"revision in set has more than one child")
                )
            r = c[0].rev()
        else:
            cs.add(r)
    return subset & cs

def ancestorspec(repo, subset, x, n, order):
    """``set~n``
    Changesets that are the Nth ancestor (first parents only) of a changeset
    in set.
    """
    n = getinteger(n, _(b"~ expects a number"))
    if n < 0:
        # children lookup
        return _childrenspec(repo, subset, x, -n, order)
    ps = set()
    cl = repo.changelog

                r = repo[r].p1().rev()
        ps.add(r)
    return subset & ps


@predicate(b'author(string)', safe=True, weight=10)
def author(repo, subset, x):
    """Alias for ``user(string)``.
    """
    # i18n: "author" is a keyword
    n = getstring(x, _(b"author requires a string"))
    kind, pattern, matcher = _substringmatcher(n, casesensitive=False)
    return subset.filter(
        lambda x: matcher(repo[x].user()), condrepr=(b'<user %r>', n)
    )


@predicate(b'bisect(string)', safe=True)
def bisect(repo, subset, x):
    """Changesets marked in the specified bisect status:

    - ``good``, ``bad``, ``skip``: csets explicitly marked as good/bad/skip
    - ``goods``, ``bads``      : csets topologically good/bad

    - ``untested``           : csets whose fate is yet unknown
    - ``ignored``            : csets ignored due to DAG topology
    - ``current``            : the cset currently being bisected
    """
    # i18n: "bisect" is a keyword
    status = getstring(x, _(b"bisect requires a string")).lower()
    state = set(hbisect.get(repo, status))
    return subset & state


# Backward-compatibility
# - no help entry so that we do not advertise it any more
@predicate(b'bisected', safe=True)
def bisected(repo, subset, x):
    return bisect(repo, subset, x)


@predicate(b'bookmark([name])', safe=True)
def bookmark(repo, subset, x):
    """The named bookmark or all bookmarks.

    Pattern matching is supported for `name`. See :hg:`help revisions.patterns`.
    """
    # i18n: "bookmark" is a keyword
    args = getargs(x, 0, 1, _(b'bookmark takes one or no arguments'))
    if args:
        bm = getstring(
            args[0],
            # i18n: "bookmark" is a keyword
            _(b'the argument to bookmark must be a string'),
        )
        kind, pattern, matcher = stringutil.stringmatcher(bm)
        bms = set()
        if kind == b'literal':
            if bm == pattern:
                pattern = repo._bookmarks.expandname(pattern)
            bmrev = repo._bookmarks.get(pattern, None)
            if not bmrev:
                raise error.RepoLookupError(
                    _(b"bookmark '%s' does not exist") % pattern
                )
            bms.add(repo[bmrev].rev())
        else:
            matchrevs = set()
            for name, bmrev in repo._bookmarks.iteritems():

        bms = {repo[r].rev() for r in repo._bookmarks.values()}
    bms -= {node.nullrev}
    return subset & bms


@predicate(b'branch(string or set)', safe=True, weight=10)
def branch(repo, subset, x):
    """
    All changesets belonging to the given branch or the branches of the given
    changesets.

            return getbi(r)[0]
        except error.WdirUnsupported:
            return repo[r].branch()

    try:
        b = getstring(x, b'')
    except error.ParseError:
        # not a string, but another revspec, e.g. tip()
        pass
    else:
        kind, pattern, matcher = stringutil.stringmatcher(b)
        if kind == b'literal':
            # note: falls through to the revspec case if no branch with
            # this name exists and pattern kind is not specified explicitly
            if repo.branchmap().hasbranch(pattern):
                return subset.filter(
                    lambda r: matcher(getbranch(r)),
                    condrepr=(b'<branch %r>', b),
                )
            if b.startswith(b'literal:'):
                raise error.RepoLookupError(
                    _(b"branch '%s' does not exist") % pattern
                )
        else:
            return subset.filter(
                lambda r: matcher(getbranch(r)), condrepr=(b'<branch %r>', b)
            )

    s = getset(repo, fullreposet(repo), x)
    b = set()
    for r in s:
        b.add(getbranch(r))
    c = s.__contains__
    return subset.filter(
        lambda r: c(r) or getbranch(r) in b,
        condrepr=lambda: b'<branch %r>' % _sortedb(b),
    )


@predicate(b'phasedivergent()', safe=True)
def phasedivergent(repo, subset, x):
    """Mutable changesets marked as successors of public changesets.

    Only non-public and non-obsolete changesets can be `phasedivergent`.
    (EXPERIMENTAL)
    """
    # i18n: "phasedivergent" is a keyword
    getargs(x, 0, 0, _(b"phasedivergent takes no arguments"))
    phasedivergent = obsmod.getrevs(repo, b'phasedivergent')
    return subset & phasedivergent


@predicate(b'bundle()', safe=True)
def bundle(repo, subset, x):
    """Changesets in the bundle.

    Bundle must be specified by the -R option."""

    try:
        bundlerevs = repo.changelog.bundlerevs
    except AttributeError:
        raise error.Abort(_(b"no bundle provided - specify with -R"))
    return subset & bundlerevs


def checkstatus(repo, subset, pat, field):
    """Helper for status-related revsets (adds, removes, modifies).
    The field parameter says which kind is desired:
    0: modified
    1: added
    2: removed
    """
    hasset = matchmod.patkind(pat) == b'set'

    mcache = [None]

    def matches(x):
        c = repo[x]

        else:
            for f in files:
                if m(f):
                    return True

    return subset.filter(matches, condrepr=(b'<status[%r] %r>', field, pat))


def _children(repo, subset, parentset):
    if not parentset:
        return baseset()

        if p2 != nullrev and p2 in parentset:
            cs.add(r)
    return baseset(cs)


@predicate(b'children(set)', safe=True)
def children(repo, subset, x):
    """Child changesets of changesets in set.
    """
    s = getset(repo, fullreposet(repo), x)
    cs = _children(repo, subset, s)
    return subset & cs


@predicate(b'closed()', safe=True, weight=10)
def closed(repo, subset, x):
    """Changeset is closed.
    """
    # i18n: "closed" is a keyword
    getargs(x, 0, 0, _(b"closed takes no arguments"))
    return subset.filter(
        lambda r: repo[r].closesbranch(), condrepr=b'<branch closed>'
    )


# for internal use
@predicate(b'_commonancestorheads(set)', safe=True)
def _commonancestorheads(repo, subset, x):
    # This is an internal method is for quickly calculating "heads(::x and
    # ::y)"

    # These greatest common ancestors are the same ones that the consensus bid

    ancs = repo.changelog._commonancestorsheads(*list(startrevs))
    return subset & baseset(ancs)


@predicate(b'commonancestors(set)', safe=True)
def commonancestors(repo, subset, x):
    """Changesets that are ancestors of every changeset in set.
    """
    startrevs = getset(repo, fullreposet(repo), x, order=anyorder)
    if not startrevs:

    for r in startrevs:
        subset &= dagop.revancestors(repo, baseset([r]))
    return subset


@predicate(b'contains(pattern)', weight=100)
def contains(repo, subset, x):
    """The revision's manifest contains a file matching pattern (but might not
    modify it). See :hg:`help patterns` for information about file patterns.

    The pattern without explicit kind like ``glob:`` is expected to be
    relative to the current directory and match against a file exactly
    for efficiency.
    """
    # i18n: "contains" is a keyword
    pat = getstring(x, _(b"contains requires a pattern"))

    def matches(x):
        if not matchmod.patkind(pat):
            pats = pathutil.canonpath(repo.root, repo.getcwd(), pat)
            if pats in repo[x]:

            for f in c.manifest():
                if m(f):
                    return True
        return False

    return subset.filter(matches, condrepr=(b'<contains %r>', pat))


@predicate(b'converted([id])', safe=True)
def converted(repo, subset, x):
    """Changesets converted from the given identifier in the old repository if
    present, or all converted changesets if no identifier is specified.
    """

    # There is exactly no chance of resolving the revision, so do a simple
    # string compare and hope for the best

    rev = None
    # i18n: "converted" is a keyword
    l = getargs(x, 0, 1, _(b'converted takes one or no arguments'))
    if l:
        # i18n: "converted" is a keyword
        rev = getstring(l[0], _(b'converted requires a revision'))

    def _matchvalue(r):
        source = repo[r].extra().get(b'convert_revision', None)
        return source is not None and (rev is None or source.startswith(rev))

    return subset.filter(
        lambda r: _matchvalue(r), condrepr=(b'<converted %r>', rev)
    )


@predicate(b'date(interval)', safe=True, weight=10)
def date(repo, subset, x):
    """Changesets within the interval, see :hg:`help dates`.
    """
    # i18n: "date" is a keyword
    ds = getstring(x, _(b"date requires a string"))
    dm = dateutil.matchdate(ds)
    return subset.filter(
        lambda x: dm(repo[x].date()[0]), condrepr=(b'<date %r>', ds)
    )


@predicate(b'desc(string)', safe=True, weight=10)
def desc(repo, subset, x):
    """Search commit message for string. The match is case-insensitive.

    Pattern matching is supported for `string`. See
    :hg:`help revisions.patterns`.
    """
    # i18n: "desc" is a keyword
    ds = getstring(x, _(b"desc requires a string"))

    kind, pattern, matcher = _substringmatcher(ds, casesensitive=False)

    return subset.filter(
        lambda r: matcher(repo[r].description()), condrepr=(b'<desc %r>', ds)
    )


def _descendants(
    repo, subset, x, followfirst=False, startdepth=None, stopdepth=None

        return baseset()
    s = dagop.revdescendants(repo, roots, followfirst, startdepth, stopdepth)
    return subset & s


@predicate(b'descendants(set[, depth])', safe=True)
def descendants(repo, subset, x):
    """Changesets which are descendants of changesets in set, including the
    given changesets themselves.

    If depth is specified, the result only includes changesets up to
    the specified generation.
    """
    # startdepth is for internal use only until we can decide the UI
    args = getargsdict(x, b'descendants', b'set depth startdepth')
    if b'set' not in args:
        # i18n: "descendants" is a keyword
        raise error.ParseError(_(b'descendants takes at least 1 argument'))
    startdepth = stopdepth = None
    if b'startdepth' in args:
        n = getinteger(
            args[b'startdepth'], b"descendants expects an integer startdepth"
        )
        if n < 0:
            raise error.ParseError(b"negative startdepth")
        startdepth = n
    if b'depth' in args:
        # i18n: "descendants" is a keyword
        n = getinteger(
            args[b'depth'], _(b"descendants expects an integer depth")
        )
        if n < 0:
            raise error.ParseError(_(b"negative depth"))
        stopdepth = n + 1
    return _descendants(
        repo, subset, args[b'set'], startdepth=startdepth, stopdepth=stopdepth
    )


@predicate(b'_firstdescendants', safe=True)
def _firstdescendants(repo, subset, x):
    # ``_firstdescendants(set)``
    # Like ``descendants(set)`` but follows only the first parents.
    return _descendants(repo, subset, x, followfirst=True)


@predicate(b'destination([set])', safe=True, weight=10)
def destination(repo, subset, x):
    """Changesets that were created by a graft, transplant or rebase operation,
    with the given revisions specified as the source.  Omitting the optional set
    is the same as passing all().
    """

            r = src
            src = _getrevsource(repo, r)

    return subset.filter(
        dests.__contains__,
        condrepr=lambda: b'<destination %r>' % _sortedb(dests),
    )


@predicate(b'contentdivergent()', safe=True)
def contentdivergent(repo, subset, x):
    """
    Final successors of changesets with an alternative set of final
    successors. (EXPERIMENTAL)
    """
    # i18n: "contentdivergent" is a keyword
    getargs(x, 0, 0, _(b"contentdivergent takes no arguments"))
    contentdivergent = obsmod.getrevs(repo, b'contentdivergent')
    return subset & contentdivergent


@predicate(b'expectsize(set[, size])', safe=True, takeorder=True)
def expectsize(repo, subset, x, order):
    """Return the given revset if size matches the revset size.
    Abort if the revset doesn't expect given size.
    size can either be an integer range or an integer.

    For example, ``expectsize(0:1, 3:5)`` will abort as revset size is 2 and
    2 is not between 3 and 5 inclusive."""

    args = getargsdict(x, b'expectsize', b'set size')
    minsize = 0
    maxsize = len(repo) + 1
    err = b''
    if b'size' not in args or b'set' not in args:
        raise error.ParseError(_(b'invalid set of arguments'))
    minsize, maxsize = getintrange(
        args[b'size'],
        _(b'expectsize requires a size range' b' or a positive integer'),
        _(b'size range bounds must be integers'),
        minsize,
        maxsize,
    )
    if minsize < 0 or maxsize < 0:
        raise error.ParseError(_(b'negative size'))
    rev = getset(repo, fullreposet(repo), args[b'set'], order=order)
    if minsize != maxsize and (len(rev) < minsize or len(rev) > maxsize):
        err = _(
            b'revset size mismatch.' b' expected between %d and %d, got %d'
        ) % (minsize, maxsize, len(rev))
    elif minsize == maxsize and len(rev) != minsize:
        err = _(b'revset size mismatch.' b' expected %d, got %d') % (
            minsize,
            len(rev),
        )
    if err:
        raise error.RepoLookupError(err)

        return subset & rev
    else:
        return rev & subset


@predicate(b'extdata(source)', safe=False, weight=100)
def extdata(repo, subset, x):
    """Changesets in the specified extdata source. (EXPERIMENTAL)"""
    # i18n: "extdata" is a keyword
    args = getargsdict(x, b'extdata', b'source')
    source = getstring(
        args.get(b'source'),
        # i18n: "extdata" is a keyword
        _(b'extdata takes at least 1 string argument'),
    )
    data = scmutil.extdatasource(repo, source)
    return subset & baseset(data)


@predicate(b'extinct()', safe=True)
def extinct(repo, subset, x):
    """Obsolete changesets with obsolete descendants only.
    """
    # i18n: "extinct" is a keyword
    getargs(x, 0, 0, _(b"extinct takes no arguments"))
    extincts = obsmod.getrevs(repo, b'extinct')
    return subset & extincts


@predicate(b'extra(label, [value])', safe=True)
def extra(repo, subset, x):
    """Changesets with the given label in the extra metadata, with the given
    optional value.

    Pattern matching is supported for `value`. See
    :hg:`help revisions.patterns`.
    """
    args = getargsdict(x, b'extra', b'label value')
    if b'label' not in args:
        # i18n: "extra" is a keyword
        raise error.ParseError(_(b'extra takes at least 1 argument'))
    # i18n: "extra" is a keyword
    label = getstring(
        args[b'label'], _(b'first argument to extra must be ' b'a string')
    )
    value = None

    if b'value' in args:
        # i18n: "extra" is a keyword
        value = getstring(
            args[b'value'], _(b'second argument to extra must be ' b'a string')
        )
        kind, value, matcher = stringutil.stringmatcher(value)

    def _matchvalue(r):
        extra = repo[r].extra()
        return label in extra and (value is None or matcher(extra[label]))

    return subset.filter(
        lambda r: _matchvalue(r), condrepr=(b'<extra[%r] %r>', label, value)
    )


@predicate(b'filelog(pattern)', safe=True)
def filelog(repo, subset, x):
    """Changesets connected to the specified filelog.

    For performance reasons, visits only revisions mentioned in the file-level
    filelog, rather than filtering through all changesets (much faster, but

    relative to the current directory and match against a file exactly
    for efficiency.
    """

    # i18n: "filelog" is a keyword
    pat = getstring(x, _(b"filelog requires a pattern"))
    s = set()
    cl = repo.changelog

    if not matchmod.patkind(pat):
        f = pathutil.canonpath(repo.root, repo.getcwd(), pat)

                            continue

    return subset & s


@predicate(b'first(set, [n])', safe=True, takeorder=True, weight=0)
def first(repo, subset, x, order):
    """An alias for limit().
    """
    return limit(repo, subset, x, order)


def _follow(repo, subset, x, name, followfirst=False):
    args = getargsdict(x, name, b'file startrev')
    revs = None
    if b'startrev' in args:
        revs = getset(repo, fullreposet(repo), args[b'startrev'])
    if b'file' in args:
        x = getstring(args[b'file'], _(b"%s expected a pattern") % name)
        if revs is None:
            revs = [None]
        fctxs = []
        for r in revs:
            ctx = mctx = repo[r]
            if r is None:
                ctx = repo[b'.']
            m = matchmod.match(
                repo.root, repo.getcwd(), [x], ctx=mctx, default=b'path'
            )
            fctxs.extend(ctx[f].introfilectx() for f in ctx.manifest().walk(m))
        s = dagop.filerevancestors(fctxs, followfirst)
    else:
        if revs is None:
            revs = baseset([repo[b'.'].rev()])
        s = dagop.revancestors(repo, revs, followfirst)

    return subset & s


@predicate(b'follow([file[, startrev]])', safe=True)
def follow(repo, subset, x):
    """
    An alias for ``::.`` (ancestors of the working directory's first parent).
    If file pattern is specified, the histories of files matching given
    pattern in the revision given by startrev are followed, including copies.
    """
    return _follow(repo, subset, x, b'follow')


@predicate(b'_followfirst', safe=True)
def _followfirst(repo, subset, x):
    # ``followfirst([file[, startrev]])``
    # Like ``follow([file[, startrev]])`` but follows only the first parent
    # of every revisions or files revisions.
    return _follow(repo, subset, x, b'_followfirst', followfirst=True)


@predicate(
    b'followlines(file, fromline:toline[, startrev=., descend=False])',
    safe=True,
)
def followlines(repo, subset, x):
    """Changesets modifying `file` in line range ('fromline', 'toline').

    Line range corresponds to 'file' content at 'startrev' and should hence be

    By default, ancestors of 'startrev' are returned. If 'descend' is True,
    descendants of 'startrev' are returned though renames are (currently) not
    followed in this direction.
    """
    args = getargsdict(x, b'followlines', b'file *lines startrev descend')
    if len(args[b'lines']) != 1:
        raise error.ParseError(_(b"followlines requires a line range"))

    rev = b'.'
    if b'startrev' in args:
        revs = getset(repo, fullreposet(repo), args[b'startrev'])
        if len(revs) != 1:
            raise error.ParseError(
                # i18n: "followlines" is a keyword
                _(b"followlines expects exactly one revision")
            )
        rev = revs.last()

    pat = getstring(args[b'file'], _(b"followlines requires a pattern"))
    # i18n: "followlines" is a keyword
    msg = _(b"followlines expects exactly one file")
    fname = scmutil.parsefollowlinespattern(repo, rev, pat, msg)
    fromline, toline = util.processlinerange(
        *getintrange(
            args[b'lines'][0],
            # i18n: "followlines" is a keyword
            _(b"followlines expects a line number or a range"),
            _(b"line range bounds must be integers"),
        )
    )

    fctx = repo[rev].filectx(fname)
    descend = False
    if b'descend' in args:
        descend = getboolean(
            args[b'descend'],
            # i18n: "descend" is a keyword
            _(b"descend argument must be a boolean"),
        )
    if descend:
        rs = generatorset(
            (
                c.rev()

            iterasc=False,
        )
    return subset & rs


@predicate(b'all()', safe=True)
def getall(repo, subset, x):
    """All changesets, the same as ``0:tip``.
    """
    # i18n: "all" is a keyword
    getargs(x, 0, 0, _(b"all takes no arguments"))
    return subset & spanset(repo)  # drop "null" if any


@predicate(b'grep(regex)', weight=10)
def grep(repo, subset, x):
    """Like ``keyword(string)`` but accepts a regex. Use ``grep(r'...')``
    to ensure special escape characters are handled correctly. Unlike
    ``keyword(string)``, the match is case-sensitive.
    """
    try:
        # i18n: "grep" is a keyword
        gr = re.compile(getstring(x, _(b"grep requires a string")))
    except re.error as e:
        raise error.ParseError(
            _(b'invalid match pattern: %s') % stringutil.forcebytestr(e)
        )

    def matches(x):
        c = repo[x]
        for e in c.files() + [c.user(), c.description()]:
            if gr.search(e):
                return True
        return False

    return subset.filter(matches, condrepr=(b'<grep %r>', gr.pattern))


@predicate(b'_matchfiles', safe=True)
def _matchfiles(repo, subset, x):
    # _matchfiles takes a revset list of prefixed arguments:
    #
    #   [p:foo, i:bar, x:baz]
    #

    # a revision identifier, or the empty string to reference the
    # working directory, from which the match object is
    # initialized. Use 'd:' to set the default matching mode, default
    # to 'glob'. At most one 'r:' and 'd:' argument can be passed.

    l = getargs(x, 1, -1, b"_matchfiles requires at least one argument")
    pats, inc, exc = [], [], []
    rev, default = None, None
    for arg in l:
        s = getstring(arg, b"_matchfiles requires string arguments")
        prefix, value = s[:2], s[2:]
        if prefix == b'p:':
            pats.append(value)
        elif prefix == b'i:':
            inc.append(value)
        elif prefix == b'x:':
            exc.append(value)
        elif prefix == b'r:':
            if rev is not None:
                raise error.ParseError(
                    b'_matchfiles expected at most one ' b'revision'
                )
            if value == b'':  # empty means working directory
                rev = node.wdirrev
            else:
                rev = value
        elif prefix == b'd:':
            if default is not None:
                raise error.ParseError(
                    b'_matchfiles expected at most one ' b'default mode'
                )
            default = value
        else:
            raise error.ParseError(b'invalid _matchfiles prefix: %s' % prefix)
    if not default:
        default = b'glob'
    hasset = any(matchmod.patkind(p) == b'set' for p in pats + inc + exc)

    mcache = [None]

    # This directly read the changelog data as creating changectx for all
    # revisions is quite expensive.

        return False

    return subset.filter(
        matches,
        condrepr=(
            b'<matchfiles patterns=%r, include=%r '
            b'exclude=%r, default=%r, rev=%r>',
            pats,
            inc,
            exc,
            default,
            rev,
        ),
    )


@predicate(b'file(pattern)', safe=True, weight=10)
def hasfile(repo, subset, x):
    """Changesets affecting files matched by pattern.

    For a faster but less accurate result, consider using ``filelog()``
    instead.

    This predicate uses ``glob:`` as the default kind of pattern.
    """
    # i18n: "file" is a keyword
    pat = getstring(x, _(b"file requires a pattern"))
    return _matchfiles(repo, subset, (b'string', b'p:' + pat))


@predicate(b'head()', safe=True)
def head(repo, subset, x):
    """Changeset is a named branch head.
    """
    # i18n: "head" is a keyword
    getargs(x, 0, 0, _(b"head takes no arguments"))
    hs = set()
    cl = repo.changelog
    for ls in repo.branchmap().iterheads():
        hs.update(cl.rev(h) for h in ls)
    return subset & baseset(hs)


@predicate(b'heads(set)', safe=True, takeorder=True)
def heads(repo, subset, x, order):
    """Members of set with no children in set.
    """
    # argument set should never define order
    if order == defineorder:

        heads.add(node.wdirrev)
    heads = baseset(heads)
    return subset & heads


@predicate(b'hidden()', safe=True)
def hidden(repo, subset, x):
    """Hidden changesets.
    """
    # i18n: "hidden" is a keyword
    getargs(x, 0, 0, _(b"hidden takes no arguments"))
    hiddenrevs = repoview.filterrevs(repo, b'visible')
    return subset & hiddenrevs


@predicate(b'keyword(string)', safe=True, weight=10)
def keyword(repo, subset, x):
    """Search commit message, user name, and names of changed files for
    string. The match is case-insensitive.

    For a regular expression or case sensitive search of these fields, use
    ``grep(regex)``.
    """
    # i18n: "keyword" is a keyword
    kw = encoding.lower(getstring(x, _(b"keyword requires a string")))

    def matches(r):
        c = repo[r]
        return any(
            kw in encoding.lower(t)
            for t in c.files() + [c.user(), c.description()]
        )

    return subset.filter(matches, condrepr=(b'<keyword %r>', kw))


@predicate(b'limit(set[, n[, offset]])', safe=True, takeorder=True, weight=0)
def limit(repo, subset, x, order):
    """First n members of set, defaulting to 1, starting from offset.
    """
    args = getargsdict(x, b'limit', b'set n offset')
    if b'set' not in args:
        # i18n: "limit" is a keyword
        raise error.ParseError(_(b"limit requires one to three arguments"))
    # i18n: "limit" is a keyword
    lim = getinteger(args.get(b'n'), _(b"limit expects a number"), default=1)
    if lim < 0:
        raise error.ParseError(_(b"negative number to select"))
    # i18n: "limit" is a keyword
    ofs = getinteger(
        args.get(b'offset'), _(b"limit expects a number"), default=0
    )
    if ofs < 0:
        raise error.ParseError(_(b"negative offset"))
    os = getset(repo, fullreposet(repo), args[b'set'])
    ls = os.slice(ofs, ofs + lim)
    if order == followorder and lim > 1:
        return subset & ls
    return ls & subset


@predicate(b'last(set, [n])', safe=True, takeorder=True)
def last(repo, subset, x, order):
    """Last n members of set, defaulting to 1.
    """
    # i18n: "last" is a keyword
    l = getargs(x, 1, 2, _(b"last requires one or two arguments"))
    lim = 1
    if len(l) == 2:
        # i18n: "last" is a keyword
        lim = getinteger(l[1], _(b"last expects a number"))
    if lim < 0:
        raise error.ParseError(_(b"negative number to select"))
    os = getset(repo, fullreposet(repo), l[0])
    os.reverse()
    ls = os.slice(0, lim)
    if order == followorder and lim > 1:
        return subset & ls
    ls.reverse()
    return ls & subset


@predicate(b'max(set)', safe=True)
def maxrev(repo, subset, x):
    """Changeset with highest revision number in set.
    """
    os = getset(repo, fullreposet(repo), x)
    try:
        m = os.max()
        if m in subset:
            return baseset([m], datarepr=(b'<max %r, %r>', subset, os))
    except ValueError:
        # os.max() throws a ValueError when the collection is empty.
        # Same as python's max().
        pass
    return baseset(datarepr=(b'<max %r, %r>', subset, os))


@predicate(b'merge()', safe=True)
def merge(repo, subset, x):
    """Changeset is a merge changeset.
    """
    # i18n: "merge" is a keyword
    getargs(x, 0, 0, _(b"merge takes no arguments"))
    cl = repo.changelog
    nullrev = node.nullrev

    def ismerge(r):
        try:
            return cl.parentrevs(r)[1] != nullrev
        except error.WdirUnsupported:
            return bool(repo[r].p2())

    return subset.filter(ismerge, condrepr=b'<merge>')


@predicate(b'branchpoint()', safe=True)
def branchpoint(repo, subset, x):
    """Changesets with more than one child.
    """
    # i18n: "branchpoint" is a keyword
    getargs(x, 0, 0, _(b"branchpoint takes no arguments"))
    cl = repo.changelog
    if not subset:
        return baseset()
    # XXX this should be 'parentset.min()' assuming 'parentset' is a smartset
    # (and if it is not, it should.)

    for r in cl.revs(start=baserev + 1):
        for p in cl.parentrevs(r):
            if p >= baserev:
                parentscount[p - baserev] += 1
    return subset.filter(
        lambda r: parentscount[r - baserev] > 1, condrepr=b'<branchpoint>'
    )


@predicate(b'min(set)', safe=True)
def minrev(repo, subset, x):
    """Changeset with lowest revision number in set.
    """
    os = getset(repo, fullreposet(repo), x)
    try:
        m = os.min()
        if m in subset:
            return baseset([m], datarepr=(b'<min %r, %r>', subset, os))
    except ValueError:
        # os.min() throws a ValueError when the collection is empty.
        # Same as python's min().
        pass
    return baseset(datarepr=(b'<min %r, %r>', subset, os))


@predicate(b'modifies(pattern)', safe=True, weight=30)
def modifies(repo, subset, x):
    """Changesets modifying files matched by pattern.

    The pattern without explicit kind like ``glob:`` is expected to be
    relative to the current directory and match against a file or a
    directory.
    """
    # i18n: "modifies" is a keyword
    pat = getstring(x, _(b"modifies requires a pattern"))
    return checkstatus(repo, subset, pat, 0)


@predicate(b'named(namespace)')
def named(repo, subset, x):
    """The changesets in a given namespace.

    Pattern matching is supported for `namespace`. See
    :hg:`help revisions.patterns`.
    """
    # i18n: "named" is a keyword
    args = getargs(x, 1, 1, _(b'named requires a namespace argument'))

    ns = getstring(
        args[0],
        # i18n: "named" is a keyword
        _(b'the argument to named must be a string'),
    )
    kind, pattern, matcher = stringutil.stringmatcher(ns)
    namespaces = set()
    if kind == b'literal':
        if pattern not in repo.names:
            raise error.RepoLookupError(
                _(b"namespace '%s' does not exist") % ns
            )
        namespaces.add(repo.names[pattern])
    else:
        for name, ns in repo.names.iteritems():
            if matcher(name):
                namespaces.add(ns)

    names -= {node.nullrev}
    return subset & names


@predicate(b'id(string)', safe=True)
def node_(repo, subset, x):
    """Revision non-ambiguously specified by the given hex string prefix.
    """
    # i18n: "id" is a keyword
    l = getargs(x, 1, 1, _(b"id requires one argument"))
    # i18n: "id" is a keyword
    n = getstring(l[0], _(b"id requires a string"))
    if len(n) == 40:
        try:
            rn = repo.changelog.rev(node.bin(n))
        except error.WdirUnsupported:
            rn = node.wdirrev

        return baseset()
    result = baseset([rn])
    return result & subset


@predicate(b'none()', safe=True)
def none(repo, subset, x):
    """No changesets.
    """
    # i18n: "none" is a keyword
    getargs(x, 0, 0, _(b"none takes no arguments"))
    return baseset()


@predicate(b'obsolete()', safe=True)
def obsolete(repo, subset, x):
    """Mutable changeset with a newer version."""
    # i18n: "obsolete" is a keyword
    getargs(x, 0, 0, _(b"obsolete takes no arguments"))
    obsoletes = obsmod.getrevs(repo, b'obsolete')
    return subset & obsoletes


@predicate(b'only(set, [set])', safe=True)
def only(repo, subset, x):
    """Changesets that are ancestors of the first set that are not ancestors
    of any other head in the repo. If a second set is specified, the result
    is ancestors of the first set that are not ancestors of the second set
    (i.e. ::<set1> - ::<set2>).
    """
    cl = repo.changelog
    # i18n: "only" is a keyword
    args = getargs(x, 1, 2, _(b'only takes one or two arguments'))
    include = getset(repo, fullreposet(repo), args[0])
    if len(args) == 1:
        if not include:
            return baseset()

    # XXX we should turn this into a baseset instead of a set, smartset may do
    # some optimizations from the fact this is a baseset.
    return subset & results


@predicate(b'origin([set])', safe=True)
def origin(repo, subset, x):
    """
    Changesets that were specified as a source for the grafts, transplants or
    rebases that created the given revisions.  Omitting the optional set is the
    same as passing all().  If a changeset created by these operations is itself

    # XXX we should turn this into a baseset instead of a set, smartset may do
    # some optimizations from the fact this is a baseset.
    return subset & o


@predicate(b'outgoing([path])', safe=False, weight=10)
def outgoing(repo, subset, x):
    """Changesets not found in the specified destination repository, or the
    default push location.
    """
    # Avoid cycles.

        discovery,
        hg,
    )

    # i18n: "outgoing" is a keyword
    l = getargs(x, 0, 1, _(b"outgoing takes one or no arguments"))
    # i18n: "outgoing" is a keyword
    dest = (
        l and getstring(l[0], _(b"outgoing requires a repository path")) or b''
    )
    if not dest:
        # ui.paths.getpath() explicitly tests for None, not just a boolean
        dest = None
    path = repo.ui.paths.getpath(dest, default=(b'default-push', b'default'))
    if not path:
        raise error.Abort(
            _(b'default repository not configured!'),
            hint=_(b"see 'hg help config.paths'"),
        )
    dest = path.pushloc or path.loc
    branches = path.branch, []

    revs, checkout = hg.addbranchrevs(repo, repo, branches, [])

    cl = repo.changelog
    o = {cl.rev(r) for r in outgoing.missing}
    return subset & o


@predicate(b'p1([set])', safe=True)
def p1(repo, subset, x):
    """First parent of changesets in set, or the working directory.
    """
    if x is None:
        p = repo[x].p1().rev()

    # XXX we should turn this into a baseset instead of a set, smartset may do
    # some optimizations from the fact this is a baseset.
    return subset & ps


@predicate(b'p2([set])', safe=True)
def p2(repo, subset, x):
    """Second parent of changesets in set, or the working directory.
    """
    if x is None:
        ps = repo[x].parents()

def parentpost(repo, subset, x, order):
    return p1(repo, subset, x)


@predicate(b'parents([set])', safe=True)
def parents(repo, subset, x):
    """
    The set of all parents for all changesets in set, or the working directory.
    """
    if x is None:

def _phase(repo, subset, *targets):
    """helper to select all rev in <targets> phases"""
    return repo._phasecache.getrevset(repo, targets, subset)


@predicate(b'_phase(idx)', safe=True)
def phase(repo, subset, x):
    l = getargs(x, 1, 1, b"_phase requires one argument")
    target = getinteger(l[0], b"_phase expects a number")
    return _phase(repo, subset, target)


@predicate(b'draft()', safe=True)
def draft(repo, subset, x):
    """Changeset in draft phase."""
    # i18n: "draft" is a keyword
    getargs(x, 0, 0, _(b"draft takes no arguments"))
    target = phases.draft
    return _phase(repo, subset, target)


@predicate(b'secret()', safe=True)
def secret(repo, subset, x):
    """Changeset in secret phase."""
    # i18n: "secret" is a keyword
    getargs(x, 0, 0, _(b"secret takes no arguments"))
    target = phases.secret
    return _phase(repo, subset, target)


@predicate(b'stack([revs])', safe=True)
def stack(repo, subset, x):
    """Experimental revset for the stack of changesets or working directory
    parent. (EXPERIMENTAL)
    """
    if x is None:

    try:
        n = int(n[1])
        if n not in (0, 1, 2):
            raise ValueError
    except (TypeError, ValueError):
        raise error.ParseError(_(b"^ expects a number 0, 1, or 2"))
    ps = set()
    cl = repo.changelog
    for r in getset(repo, fullreposet(repo), x):
        if n == 0:
            ps.add(r)

                if len(parents) == 2:
                    ps.add(parents[1].rev())
    return subset & ps


@predicate(b'present(set)', safe=True, takeorder=True)
def present(repo, subset, x, order):
    """An empty set, if any revision in set isn't found; otherwise,
    all revisions in set.

    If any of specified revisions is not present in the local repository,

    except error.RepoLookupError:
        return baseset()


# for internal use
@predicate(b'_notpublic', safe=True)
def _notpublic(repo, subset, x):
    getargs(x, 0, 0, b"_notpublic takes no arguments")
    return _phase(repo, subset, phases.draft, phases.secret)


# for internal use
@predicate(b'_phaseandancestors(phasename, set)', safe=True)
def _phaseandancestors(repo, subset, x):
    # equivalent to (phasename() & ancestors(set)) but more efficient
    # phasename could be one of 'draft', 'secret', or '_notpublic'
    args = getargs(x, 2, 2, b"_phaseandancestors requires two arguments")
    phasename = getsymbol(args[0])
    s = getset(repo, fullreposet(repo), args[1])

    draft = phases.draft
    secret = phases.secret
    phasenamemap = {
        b'_notpublic': draft,
        b'draft': draft,  # follow secret's ancestors
        b'secret': secret,
    }
    if phasename not in phasenamemap:
        raise error.ParseError(b'%r is not a valid phasename' % phasename)

    minimalphase = phasenamemap[phasename]
    getphase = repo._phasecache.phase

    def cutfunc(rev):
        return getphase(repo, rev) < minimalphase

    revs = dagop.revancestors(repo, s, cutfunc=cutfunc)

    if phasename == b'draft':  # need to remove secret changesets
        revs = revs.filter(lambda r: getphase(repo, r) == draft)
    return subset & revs


@predicate(b'public()', safe=True)
def public(repo, subset, x):
    """Changeset in public phase."""
    # i18n: "public" is a keyword
    getargs(x, 0, 0, _(b"public takes no arguments"))
    return _phase(repo, subset, phases.public)


@predicate(b'remote([id [,path]])', safe=False)
def remote(repo, subset, x):
    """Local revision that corresponds to the given identifier in a
    remote repository, if present. Here, the '.' identifier is a
    synonym for the current local branch.
    """

    from . import hg  # avoid start-up nasties

    # i18n: "remote" is a keyword
    l = getargs(x, 0, 2, _(b"remote takes zero, one, or two arguments"))

    q = b'.'
    if len(l) > 0:
        # i18n: "remote" is a keyword
        q = getstring(l[0], _(b"remote requires a string id"))
    if q == b'.':
        q = repo[b'.'].branch()

    dest = b''
    if len(l) > 1:
        # i18n: "remote" is a keyword
        dest = getstring(l[1], _(b"remote requires a repository path"))
    dest = repo.ui.expandpath(dest or b'default')
    dest, branches = hg.parseurl(dest)
    revs, checkout = hg.addbranchrevs(repo, repo, branches, [])
    if revs:
        revs = [repo.lookup(rev) for rev in revs]
    other = hg.peer(repo, {}, dest)

        if r in subset:
            return baseset([r])
    return baseset()


@predicate(b'removes(pattern)', safe=True, weight=30)
def removes(repo, subset, x):
    """Changesets which remove files matching pattern.

    The pattern without explicit kind like ``glob:`` is expected to be
    relative to the current directory and match against a file or a
    directory.
    """
    # i18n: "removes" is a keyword
    pat = getstring(x, _(b"removes requires a pattern"))
    return checkstatus(repo, subset, pat, 2)


@predicate(b'rev(number)', safe=True)
def rev(repo, subset, x):
    """Revision with the given numeric identifier.
    """
    # i18n: "rev" is a keyword
    l = getargs(x, 1, 1, _(b"rev requires one argument"))
    try:
        # i18n: "rev" is a keyword
        l = int(getstring(l[0], _(b"rev requires a number")))
    except (TypeError, ValueError):
        # i18n: "rev" is a keyword
        raise error.ParseError(_(b"rev expects a number"))
    if l not in repo.changelog and l not in _virtualrevs:
        return baseset()
    return subset & baseset([l])


@predicate(b'_rev(number)', safe=True)
def _rev(repo, subset, x):
    # internal version of "rev(x)" that raise error if "x" is invalid
    # i18n: "rev" is a keyword
    l = getargs(x, 1, 1, _(b"rev requires one argument"))
    try:
        # i18n: "rev" is a keyword
        l = int(getstring(l[0], _(b"rev requires a number")))
    except (TypeError, ValueError):
        # i18n: "rev" is a keyword
        raise error.ParseError(_(b"rev expects a number"))
    repo.changelog.node(l)  # check that the rev exists
    return subset & baseset([l])


@predicate(b'revset(set)', safe=True, takeorder=True)
def revsetpredicate(repo, subset, x, order):
    """Strictly interpret the content as a revset.

    The content of this special predicate will be strictly interpreted as a
    revset. For example, ``revset(id(0))`` will be interpreted as "id(0)"
    without possible ambiguity with a "id(0)" bookmark or tag.
    """
    return getset(repo, subset, x, order)


@predicate(b'matching(revision [, field])', safe=True)
def matching(repo, subset, x):
    """Changesets in which a given set of fields match the set of fields in the
    selected revision or set.

    To match more than one field pass the list of fields to match separated

    ``metadata`` is the default field which is used when no fields are
    specified. You can match more than one field at a time.
    """
    # i18n: "matching" is a keyword
    l = getargs(x, 1, 2, _(b"matching takes 1 or 2 arguments"))

    revs = getset(repo, fullreposet(repo), l[0])

    fieldlist = [b'metadata']
    if len(l) > 1:
        fieldlist = getstring(
            l[1],
            # i18n: "matching" is a keyword
            _(b"matching requires a string " b"as its second argument"),
        ).split()

    # Make sure that there are no repeated fields,
    # expand the 'special' 'metadata' field type
    # and check the 'files' whenever we check the 'diff'
    fields = []
    for field in fieldlist:
        if field == b'metadata':
            fields += [b'user', b'description', b'date']
        elif field == b'diff':
            # a revision matching the diff must also match the files
            # since matching the diff is very costly, make sure to
            # also match the files first
            fields += [b'files', b'diff']
        else:
            if field == b'author':
                field = b'user'
            fields.append(field)
    fields = set(fields)
    if b'summary' in fields and b'description' in fields:
        # If a revision matches its description it also matches its summary
        fields.discard(b'summary')

    # We may want to match more than one field
    # Not all fields take the same amount of time to be matched
    # Sort the selected fields in order of increasing matching cost
    fieldorder = [
        b'phase',
        b'parents',
        b'user',
        b'date',
        b'branch',
        b'summary',
        b'files',
        b'description',
        b'substate',
        b'diff',
    ]

    def fieldkeyfunc(f):
        try:
            return fieldorder.index(f)

    # Each field will be matched with its own "getfield" function
    # which will be added to the getfieldfuncs array of functions
    getfieldfuncs = []
    _funcs = {
        b'user': lambda r: repo[r].user(),
        b'branch': lambda r: repo[r].branch(),
        b'date': lambda r: repo[r].date(),
        b'description': lambda r: repo[r].description(),
        b'files': lambda r: repo[r].files(),
        b'parents': lambda r: repo[r].parents(),
        b'phase': lambda r: repo[r].phase(),
        b'substate': lambda r: repo[r].substate,
        b'summary': lambda r: repo[r].description().splitlines()[0],
        b'diff': lambda r: list(
            repo[r].diff(opts=diffutil.diffallopts(repo.ui, {b'git': True}))
        ),
    }
    for info in fields:
        getfield = _funcs.get(info, None)
        if getfield is None:
            raise error.ParseError(
                # i18n: "matching" is a keyword
                _(b"unexpected field name passed to matching: %s")
                % info
            )
        getfieldfuncs.append(getfield)
    # convert the getfield array of functions into a "getinfo" function
    # which returns an array of field values (or a single value if there

                    match = False
            if match:
                return True
        return False

    return subset.filter(matches, condrepr=(b'<matching%r %r>', fields, revs))


@predicate(b'reverse(set)', safe=True, takeorder=True, weight=0)
def reverse(repo, subset, x, order):
    """Reverse order of set.
    """
    l = getset(repo, subset, x, order)
    if order == defineorder:
        l.reverse()
    return l


@predicate(b'roots(set)', safe=True)
def roots(repo, subset, x):
    """Changesets in set with no parent changeset in set.
    """
    s = getset(repo, fullreposet(repo), x)
    parents = repo.changelog.parentrevs

        for p in parents(r):
            if 0 <= p and p in s:
                return False
        return True

    return subset & s.filter(filter, condrepr=b'<roots>')


_sortkeyfuncs = {
    b'rev': lambda c: c.rev(),
    b'branch': lambda c: c.branch(),
    b'desc': lambda c: c.description(),
    b'user': lambda c: c.user(),
    b'author': lambda c: c.user(),
    b'date': lambda c: c.date()[0],
}


def _getsortargs(x):
    """Parse sort options into (set, [(key, reverse)], opts)"""
    args = getargsdict(x, b'sort', b'set keys topo.firstbranch')
    if b'set' not in args:
        # i18n: "sort" is a keyword
        raise error.ParseError(_(b'sort requires one or two arguments'))
    keys = b"rev"
    if b'keys' in args:
        # i18n: "sort" is a keyword
        keys = getstring(args[b'keys'], _(b"sort spec must be a string"))

    keyflags = []
    for k in keys.split():
        fk = k
        reverse = k.startswith(b'-')
        if reverse:
            k = k[1:]
        if k not in _sortkeyfuncs and k != b'topo':
            raise error.ParseError(
                _(b"unknown sort key %r") % pycompat.bytestr(fk)
            )
        keyflags.append((k, reverse))

    if len(keyflags) > 1 and any(k == b'topo' for k, reverse in keyflags):
        # i18n: "topo" is a keyword
        raise error.ParseError(
            _(b'topo sort order cannot be combined ' b'with other sort keys')
        )

    opts = {}
    if b'topo.firstbranch' in args:
        if any(k == b'topo' for k, reverse in keyflags):
            opts[b'topo.firstbranch'] = args[b'topo.firstbranch']
        else:
            # i18n: "topo" and "topo.firstbranch" are keywords
            raise error.ParseError(
                _(
                    b'topo.firstbranch can only be used '
                    b'when using the topo sort key'
                )
            )

    return args[b'set'], keyflags, opts


@predicate(
    b'sort(set[, [-]key... [, ...]])', safe=True, takeorder=True, weight=10
)
def sort(repo, subset, x, order):
    """Sort set by keys. The default sort order is ascending, specify a key
    as ``-key`` to sort in descending order.

    s, keyflags, opts = _getsortargs(x)
    revs = getset(repo, subset, s, order)

    if not keyflags or order != defineorder:
        return revs
    if len(keyflags) == 1 and keyflags[0][0] == b"rev":
        revs.sort(reverse=keyflags[0][1])
        return revs
    elif keyflags[0][0] == b"topo":
        firstbranch = ()
        if b'topo.firstbranch' in opts:
            firstbranch = getset(repo, subset, opts[b'topo.firstbranch'])
        revs = baseset(
            dagop.toposort(revs, repo.changelog.parentrevs, firstbranch),
            istopo=True,
        )
        if keyflags[0][1]:

    for k, reverse in reversed(keyflags):
        ctxs.sort(key=_sortkeyfuncs[k], reverse=reverse)
    return baseset([c.rev() for c in ctxs])


@predicate(b'subrepo([pattern])')
def subrepo(repo, subset, x):
    """Changesets that add, modify or remove the given subrepo.  If no subrepo
    pattern is named, any subrepo changes are returned.
    """
    # i18n: "subrepo" is a keyword
    args = getargs(x, 0, 1, _(b'subrepo takes at most one argument'))
    pat = None
    if len(args) != 0:
        pat = getstring(args[0], _(b"subrepo requires a pattern"))

    m = matchmod.exact([b'.hgsubstate'])

    def submatches(names):
        k, p, m = stringutil.stringmatcher(pat)
        for name in names:
            if m(name):

        if s.removed:
            return any(submatches(c.p1().substate.keys()))

        return False

    return subset.filter(matches, condrepr=(b'<subrepo %r>', pat))


def _mapbynodefunc(repo, s, f):
    """(repo, smartset, [node] -> [node]) -> smartset

    nodemap = cl.nodemap
    result = set(torev(n) for n in f(tonode(r) for r in s) if n in nodemap)
    return smartset.baseset(result - repo.changelog.filteredrevs)


@predicate(b'successors(set)', safe=True)
def successors(repo, subset, x):
    """All successors for set, including the given set themselves"""
    s = getset(repo, fullreposet(repo), x)
    f = lambda nodes: obsutil.allsuccessors(repo.obsstore, nodes)
    d = _mapbynodefunc(repo, s, f)

def _substringmatcher(pattern, casesensitive=True):
    kind, pattern, matcher = stringutil.stringmatcher(
        pattern, casesensitive=casesensitive
    )
    if kind == b'literal':
        if not casesensitive:
            pattern = encoding.lower(pattern)
            matcher = lambda s: pattern in encoding.lower(s)
        else:
            matcher = lambda s: pattern in s
    return kind, pattern, matcher


@predicate(b'tag([name])', safe=True)
def tag(repo, subset, x):
    """The specified tag by name, or all tagged revisions if no name is given.

    Pattern matching is supported for `name`. See
    :hg:`help revisions.patterns`.
    """
    # i18n: "tag" is a keyword
    args = getargs(x, 0, 1, _(b"tag takes one or no arguments"))
    cl = repo.changelog
    if args:
        pattern = getstring(
            args[0],
            # i18n: "tag" is a keyword
            _(b'the argument to tag must be a string'),
        )
        kind, pattern, matcher = stringutil.stringmatcher(pattern)
        if kind == b'literal':
            # avoid resolving all tags
            tn = repo._tagscache.tags.get(pattern, None)
            if tn is None:
                raise error.RepoLookupError(
                    _(b"tag '%s' does not exist") % pattern
                )
            s = {repo[tn].rev()}
        else:
            s = {cl.rev(n) for t, n in repo.tagslist() if matcher(t)}
    else:
        s = {cl.rev(n) for t, n in repo.tagslist() if t != b'tip'}
    return subset & s


@predicate(b'tagged', safe=True)
def tagged(repo, subset, x):
    return tag(repo, subset, x)


@predicate(b'orphan()', safe=True)
def orphan(repo, subset, x):
    """Non-obsolete changesets with obsolete ancestors. (EXPERIMENTAL)
    """
    # i18n: "orphan" is a keyword
    getargs(x, 0, 0, _(b"orphan takes no arguments"))
    orphan = obsmod.getrevs(repo, b'orphan')
    return subset & orphan


@predicate(b'user(string)', safe=True, weight=10)
def user(repo, subset, x):
    """User name contains string. The match is case-insensitive.

    Pattern matching is supported for `string`. See
    :hg:`help revisions.patterns`.
    """
    return author(repo, subset, x)


@predicate(b'wdir()', safe=True, weight=0)
def wdir(repo, subset, x):
    """Working directory. (EXPERIMENTAL)"""
    # i18n: "wdir" is a keyword
    getargs(x, 0, 0, _(b"wdir takes no arguments"))
    if node.wdirrev in subset or isinstance(subset, fullreposet):
        return baseset([node.wdirrev])
    return baseset()


def _orderedlist(repo, subset, x):
    s = getstring(x, b"internal error")
    if not s:
        return baseset()
    # remove duplicates here. it's difficult for caller to deduplicate sets
    # because different symbols can point to the same rev.
    cl = repo.changelog
    ls = []
    seen = set()
    for t in s.split(b'\0'):
        try:
            # fast path for integer revision
            r = int(t)
            if (b'%d' % r) != t or r not in cl:
                raise ValueError
            revs = [r]
        except ValueError:
            revs = stringset(repo, subset, t, defineorder)

            seen.add(r)
    return baseset(ls)


# for internal use
@predicate(b'_list', safe=True, takeorder=True)
def _list(repo, subset, x, order):
    if order == followorder:
        # slow path to take the subset order
        return subset & _orderedlist(repo, fullreposet(repo), x)
    else:
        return _orderedlist(repo, subset, x)


def _orderedintlist(repo, subset, x):
    s = getstring(x, b"internal error")
    if not s:
        return baseset()
    ls = [int(r) for r in s.split(b'\0')]
    s = subset
    return baseset([r for r in ls if r in s])


# for internal use
@predicate(b'_intlist', safe=True, takeorder=True, weight=0)
def _intlist(repo, subset, x, order):
    if order == followorder:
        # slow path to take the subset order
        return subset & _orderedintlist(repo, fullreposet(repo), x)
    else:
        return _orderedintlist(repo, subset, x)


def _orderedhexlist(repo, subset, x):
    s = getstring(x, b"internal error")
    if not s:
        return baseset()
    cl = repo.changelog
    ls = [cl.rev(node.bin(r)) for r in s.split(b'\0')]
    s = subset
    return baseset([r for r in ls if r in s])


# for internal use
@predicate(b'_hexlist', safe=True, takeorder=True)
def _hexlist(repo, subset, x, order):
    if order == followorder:
        # slow path to take the subset order
        return subset & _orderedhexlist(repo, fullreposet(repo), x)
    else:
        return _orderedhexlist(repo, subset, x)


methods = {
    b"range": rangeset,
    b"rangeall": rangeall,
    b"rangepre": rangepre,
    b"rangepost": rangepost,
    b"dagrange": dagrange,
    b"string": stringset,
    b"symbol": stringset,
    b"and": andset,
    b"andsmally": andsmallyset,
    b"or": orset,
    b"not": notset,
    b"difference": differenceset,
    b"relation": relationset,
    b"relsubscript": relsubscriptset,
    b"subscript": subscriptset,
    b"list": listset,
    b"keyvalue": keyvaluepair,
    b"func": func,
    b"ancestor": ancestorspec,
    b"parent": parentspec,
    b"parentpost": parentpost,
    b"smartset": rawsmartset,
}

subscriptrelations = {
    b"g": generationsrel,
    b"generations": generationsrel,
}


def lookupfn(repo):
    return lambda symbol: scmutil.isrevsymbol(repo, symbol)

        def mfunc(repo, subset=None):
            return baseset()

        return mfunc
    if not all(specs):
        raise error.ParseError(_(b"empty query"))
    if len(specs) == 1:
        tree = revsetlang.parse(specs[0], lookup)
    else:
        tree = (
            b'or',
            (b'list',) + tuple(revsetlang.parse(s, lookup) for s in specs),
        )

    aliases = []
    warn = None
    if ui:
        aliases.extend(ui.configitems(b'revsetalias'))
        warn = ui.warn
    if localalias:
        aliases.extend(localalias.items())
    if aliases:
        tree = revsetlang.expandaliases(tree, aliases, warn=warn)