# Source code for MDAnalysis.topology.XYZParser

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    """
    XYZ Topology Parser
    ===================

    .. versionadded:: 0.9.1

    Reads an xyz file and pulls the atom information from it.  Because
    xyz only has atom name information, all information about residues
    and segments won't be populated.

    Classes
    -------

    .. autoclass:: XYZParser
       :members:

    """
    import numpy as np

    from ..lib.util import openany
    from .base import TopologyReaderBase
    from ..core.topology import Topology
    from ..core.topologyattrs import (
        Atomnames,
        Atomids,
        Resids,
        Resnums,
        Segids,
        Elements,
    )

    class XYZParser(TopologyReaderBase):
        """Parse a list of atoms from an XYZ file.

        Creates the following attributes:
         - Atomnames

        .. note::

            By default, atomtypes and masses will be guessed on Universe creation.
            This may change in release 3.0.
            See :ref:`Guessers` for more information.

        .. versionadded:: 0.9.1

        .. versionchanged: 1.0.0
           Store elements attribute, based on XYZ atom names
         .. versionchanged:: 2.8.0
            Removed type and mass guessing (attributes guessing takes place now
            through universe.guess_TopologyAttrs() API).

        """

        format = "XYZ"

        def parse(self, **kwargs):
            """Read the file and return the structure.

            Returns
            -------
            MDAnalysis Topology object
            """
            with openany(self.filename) as inf:
                natoms = int(inf.readline().strip())
                inf.readline()

                names = np.zeros(natoms, dtype=object)

                # Can't infinitely read as XYZ files can be multiframe
                for i in range(natoms):
                    name = inf.readline().split()[0]
                    names[i] = name

            attrs = [
                Atomnames(names),
                Atomids(np.arange(natoms) + 1),
                Resids(np.array([1])),
                Resnums(np.array([1])),
                Segids(np.array(["SYSTEM"], dtype=object)),
                Elements(names),
            ]

            top = Topology(natoms, 1, 1, attrs=attrs)

            return top