# Source code for MDAnalysis.topology.DLPolyParser

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    """DL Poly format Topology Readers --- :mod:`MDAnalysis.topology.DLPolyParser`
    ==============================================================================

    Read DL Poly_ format topology files

    DLPoly files have the following Attributes:
     - Atomnames
     - Atomids

    .. 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.

    .. _Poly: http://www.stfc.ac.uk/SCD/research/app/ccg/software/DL_POLY/44516.aspx

    Classes
    -------

    .. autoclass:: ConfigParser

    .. autoclass:: HistoryParser

    """
    import numpy as np

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

    class ConfigParser(TopologyReaderBase):
        """DL_Poly CONFIG file parser

        .. versionadded:: 0.10.1
        .. versionchanged:: 2.8.0
           Removed type and mass guessing (attributes guessing takes place now
           through universe.guess_TopologyAttrs() API).
        """

        format = "CONFIG"

        def parse(self, **kwargs):
            with openany(self.filename) as inf:
                inf.readline()
                levcfg, imcon, megatm = np.int64(inf.readline().split()[:3])
                if not imcon == 0:
                    inf.readline()
                    inf.readline()
                    inf.readline()

                names = []
                ids = []

                line = inf.readline().strip()
                while line:
                    name = line[:8].strip()
                    names.append(name)
                    try:
                        idx = int(line[8:])
                    except ValueError:
                        pass
                    else:
                        ids.append(idx)

                    inf.readline()
                    if levcfg > 0:
                        inf.readline()
                    if levcfg == 2:
                        inf.readline()

                    line = inf.readline()

            n_atoms = len(names)
            if ids:
                ids = np.array(ids)
                names = np.array(names, dtype=object)
                order = np.argsort(ids)
                ids = ids[order]
                names = names[order]
            else:
                ids = np.arange(n_atoms)

            attrs = [
                Atomnames(names),
                Atomids(ids),
                Resids(np.array([1])),
                Resnums(np.array([1])),
                Segids(np.array(["SYSTEM"], dtype=object)),
            ]
            top = Topology(n_atoms, 1, 1, attrs=attrs)

            return top

    class HistoryParser(TopologyReaderBase):
        """DL_Poly History file parser

        .. versionadded:: 0.10.1
        """

        format = "HISTORY"

        def parse(self, **kwargs):
            with openany(self.filename) as inf:
                inf.readline()
                levcfg, imcon, megatm = np.int64(inf.readline().split()[:3])

                names = []
                ids = []

                line = inf.readline()
                while not (len(line.split()) == 4 or len(line.split()) == 5):
                    line = inf.readline()
                    if line == "":
                        raise EOFError("End of file reached when reading HISTORY.")

                while line and not line.startswith("timestep"):
                    name = line[:8].strip()
                    names.append(name)
                    try:
                        idx = int(line.split()[1])
                    except ValueError:
                        pass
                    else:
                        ids.append(idx)

                    inf.readline()
                    if levcfg > 0:
                        inf.readline()
                    if levcfg == 2:
                        inf.readline()

                    line = inf.readline()

            n_atoms = len(names)
            if ids:
                ids = np.array(ids)
                names = np.array(names, dtype=object)
                order = np.argsort(ids)
                ids = ids[order]
                names = names[order]
            else:
                ids = np.arange(n_atoms)

            attrs = [
                Atomnames(names),
                Atomids(ids),
                Resids(np.array([1])),
                Resnums(np.array([1])),
                Segids(np.array(["SYSTEM"], dtype=object)),
            ]
            top = Topology(n_atoms, 1, 1, attrs=attrs)

            return top