# parsers.py - Python implementation of parsers.c

#

# Copyright 2009 Olivia Mackall <olivia@selenic.com> and others

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import struct

import zlib

from ..node import (

    nullrev,

    sha1nodeconstants,

)

from ..thirdparty import attr

from .. import (

    error,

    pycompat,

    revlogutils,

    util,

)

from ..revlogutils import nodemap as nodemaputil

from ..revlogutils import constants as revlog_constants

stringio = pycompat.bytesio

_pack = struct.pack

_unpack = struct.unpack

_compress = zlib.compress

_decompress = zlib.decompress

# a special value used internally for `size` if the file come from the other parent

FROM_P2 = -2

# a special value used internally for `size` if the file is modified/merged/added

NONNORMAL = -1

# a special value used internally for `time` if the time is ambigeous

AMBIGUOUS_TIME = -1

@attr.s(slots=True, init=False)

class DirstateItem(object):

    """represent a dirstate entry

    It hold multiple attributes

    # about file tracking

    - wc_tracked: is the file tracked by the working copy

    - p1_tracked: is the file tracked in working copy first parent

    - p2_info: the file has been involved in some merge operation. Either

               because it was actually merged, or because the p2 version was

               ahead, or because some renamed moved it there. In either case

               `hg status` will want it displayed as modified.

    # about the file state expected from p1 manifest:

    - mode: the file mode in p1

    - size: the file size in p1

    These value can be set to None, which mean we don't have a meaningful value

    to compare with. Either because we don't really care about them as there

    `status` is known without having to look at the disk or because we don't

    know these right now and a full comparison will be needed to find out if

    the file is clean.

    # about the file state on disk last time we saw it:

    - mtime: the last known clean mtime for the file.

    This value can be set to None if no cachable state exist. Either because we

    do not care (see previous section) or because we could not cache something

    yet.

    """

    _wc_tracked = attr.ib()

    _p1_tracked = attr.ib()

    _p2_info = attr.ib()

    _mode = attr.ib()

    _size = attr.ib()

    _mtime = attr.ib()

    def __init__(

        self,

        wc_tracked=False,

        p1_tracked=False,

        p2_info=False,

        has_meaningful_data=True,

        has_meaningful_mtime=True,

        parentfiledata=None,

    ):

        self._wc_tracked = wc_tracked

        self._p1_tracked = p1_tracked

        self._p2_info = p2_info

        self._mode = None

        self._size = None

        self._mtime = None

        if parentfiledata is None:

            has_meaningful_mtime = False

            has_meaningful_data = False

        if has_meaningful_data:

            self._mode = parentfiledata[0]

            self._size = parentfiledata[1]

        if has_meaningful_mtime:

            self._mtime = parentfiledata[2]

    @classmethod

    def new_added(cls):

        """constructor to help legacy API to build a new "added" item

        Should eventually be removed

        """

        return cls(wc_tracked=True)

    @classmethod

    def new_merged(cls):

        """constructor to help legacy API to build a new "merged" item

        Should eventually be removed

        """

        return cls(wc_tracked=True, p1_tracked=True, p2_info=True)

    @classmethod

    def new_from_p2(cls):

        """constructor to help legacy API to build a new "from_p2" item

        Should eventually be removed

        """

        return cls(wc_tracked=True, p2_info=True)

    @classmethod

    def new_possibly_dirty(cls):

        """constructor to help legacy API to build a new "possibly_dirty" item

        Should eventually be removed

        """

        return cls(wc_tracked=True, p1_tracked=True)

    @classmethod

    def new_normal(cls, mode, size, mtime):

        """constructor to help legacy API to build a new "normal" item

        Should eventually be removed

        """

        assert size != FROM_P2

        assert size != NONNORMAL

        return cls(

            wc_tracked=True,

            p1_tracked=True,

            parentfiledata=(mode, size, mtime),

        )

    @classmethod

    def from_v1_data(cls, state, mode, size, mtime):

        """Build a new DirstateItem object from V1 data

        Since the dirstate-v1 format is frozen, the signature of this function

        is not expected to change, unlike the __init__ one.

        """

        if state == b'm':

            return cls.new_merged()

        elif state == b'a':

            return cls.new_added()

        elif state == b'r':

            if size == NONNORMAL:

                p1_tracked = True

                p2_info = True

            elif size == FROM_P2:

                p1_tracked = False

                p2_info = True

            else:

                p1_tracked = True

                p2_info = False

            return cls(p1_tracked=p1_tracked, p2_info=p2_info)

        elif state == b'n':

            if size == FROM_P2:

                return cls.new_from_p2()

            elif size == NONNORMAL:

                return cls.new_possibly_dirty()

            elif mtime == AMBIGUOUS_TIME:

                instance = cls.new_normal(mode, size, 42)

                instance._mtime = None

                return instance

            else:

                return cls.new_normal(mode, size, mtime)

        else:

            raise RuntimeError(b'unknown state: %s' % state)

    def set_possibly_dirty(self):

        """Mark a file as "possibly dirty"

        This means the next status call will have to actually check its content

        to make sure it is correct.

        """

        self._mtime = None

    def set_clean(self, mode, size, mtime):

        """mark a file as "clean" cancelling potential "possibly dirty call"

        Note: this function is a descendant of `dirstate.normal` and is

        currently expected to be call on "normal" entry only. There are not

        reason for this to not change in the future as long as the ccode is

        updated to preserve the proper state of the non-normal files.

        """

        self._wc_tracked = True

        self._p1_tracked = True

        self._mode = mode

        self._size = size

        self._mtime = mtime

    def set_tracked(self):

        """mark a file as tracked in the working copy

        This will ultimately be called by command like `hg add`.

        """

        self._wc_tracked = True

        # `set_tracked` is replacing various `normallookup` call. So we mark

        # the files as needing lookup

        #

        # Consider dropping this in the future in favor of something less broad.

        self._mtime = None

    def set_untracked(self):

        """mark a file as untracked in the working copy

        This will ultimately be called by command like `hg remove`.

        """

        self._wc_tracked = False

        self._mode = None

        self._size = None

        self._mtime = None

    def drop_merge_data(self):

        """remove all "merge-only" from a DirstateItem

        This is to be call by the dirstatemap code when the second parent is dropped

        """

        if self._p2_info:

            self._p2_info = False

            self._mode = None

            self._size = None

            self._mtime = None

    @property

    def mode(self):

        return self.v1_mode()

    @property

    def size(self):

        return self.v1_size()

    @property

    def mtime(self):

        return self.v1_mtime()

    @property

    def state(self):

        """

        States are:

          n  normal

          m  needs merging

          r  marked for removal

          a  marked for addition

        XXX This "state" is a bit obscure and mostly a direct expression of the

        dirstatev1 format. It would make sense to ultimately deprecate it in

        favor of the more "semantic" attributes.

        """

        if not self.any_tracked:

            return b'?'

        return self.v1_state()

    @property

    def tracked(self):

        """True is the file is tracked in the working copy"""

        return self._wc_tracked

    @property

    def any_tracked(self):

        """True is the file is tracked anywhere (wc or parents)"""

        return self._wc_tracked or self._p1_tracked or self._p2_info

    @property

    def added(self):

        """True if the file has been added"""

        return self._wc_tracked and not (self._p1_tracked or self._p2_info)

    @property

    def maybe_clean(self):

        """True if the file has a chance to be in the "clean" state"""

        if not self._wc_tracked:

            return False

        elif not self._p1_tracked:

            return False

        elif self._p2_info:

            return False

        return True

    @property

    def p1_tracked(self):

        """True if the file is tracked in the first parent manifest"""

        return self._p1_tracked

    @property

    def p2_info(self):

        """True if the file needed to merge or apply any input from p2

        See the class documentation for details.

        """

        return self._wc_tracked and self._p2_info

    @property

    def merged(self):

        """True if the file has been merged

        Should only be set if a merge is in progress in the dirstate

        """

        return self._wc_tracked and self._p1_tracked and self._p2_info

    @property

    def removed(self):

        """True if the file has been removed"""

        return not self._wc_tracked and (self._p1_tracked or self._p2_info)

    def v1_state(self):

        """return a "state" suitable for v1 serialization"""

        if not self.any_tracked:

            # the object has no state to record, this is -currently-

            # unsupported

            raise RuntimeError('untracked item')

        elif self.removed:

            return b'r'

            return b'm'

        elif self.added:

            return b'a'

        else:

            return b'n'

    def v1_mode(self):

        """return a "mode" suitable for v1 serialization"""

        return self._mode if self._mode is not None else 0

    def v1_size(self):

        """return a "size" suitable for v1 serialization"""

        if not self.any_tracked:

            # the object has no state to record, this is -currently-

            # unsupported

            raise RuntimeError('untracked item')

        elif self.removed and self._p1_tracked and self._p2_info:

            return NONNORMAL

        elif self._p2_info:

            return FROM_P2

        elif self.removed:

            return 0

        elif self.added:

            return NONNORMAL

        elif self._size is None:

            return NONNORMAL

        else:

            return self._size

    def v1_mtime(self):

        """return a "mtime" suitable for v1 serialization"""

        if not self.any_tracked:

            # the object has no state to record, this is -currently-

            # unsupported

            raise RuntimeError('untracked item')

        elif self.removed:

            return 0

        elif self._mtime is None:

            return AMBIGUOUS_TIME

        elif self._p2_info:

            return AMBIGUOUS_TIME

        elif not self._p1_tracked:

            return AMBIGUOUS_TIME

        else:

            return self._mtime

    def need_delay(self, now):

        """True if the stored mtime would be ambiguous with the current time"""

        return self.v1_state() == b'n' and self.v1_mtime() == now

def gettype(q):

    return int(q & 0xFFFF)

class BaseIndexObject(object):

    # Can I be passed to an algorithme implemented in Rust ?

    rust_ext_compat = 0

    # Format of an index entry according to Python's `struct` language

    index_format = revlog_constants.INDEX_ENTRY_V1

    # Size of a C unsigned long long int, platform independent

    big_int_size = struct.calcsize(b'>Q')

    # Size of a C long int, platform independent

    int_size = struct.calcsize(b'>i')

    # An empty index entry, used as a default value to be overridden, or nullrev

    null_item = (

        0,

        0,

        0,

        -1,

        -1,

        -1,

        -1,