Source code for pcapkit.vendor.reg.transtype

# -*- coding: utf-8 -*-
"""Transport Layer Protocol Numbers
======================================

.. module:: pcapkit.vendor.reg.transtype

This module contains the vendor crawler for **Transport Layer Protocol Numbers**,
which is automatically generating :class:`pcapkit.const.reg.transtype.TransType`.

"""

import collections
import csv
import re
import sys
from typing import TYPE_CHECKING

from pcapkit.vendor.default import Vendor

if TYPE_CHECKING:
    from collections import Counter

__all__ = ['TransType']




class TransType(Vendor):
    """Transport Layer Protocol Numbers"""

    #: Value limit checker.
    FLAG = 'isinstance(value, int) and 0 <= value <= 255'
    #: Link to registry.
    LINK = 'https://www.iana.org/assignments/protocol-numbers/protocol-numbers-1.csv'

    def count(self, data: 'list[str]') -> 'Counter[str]':
        """Count field records.

        Args:
            data: CSV data.

        Returns:
            Field recordings.

        """
        reader = csv.reader(data)
        next(reader)  # header
        return collections.Counter(map(lambda item: self.safe_name(item[1] or item[2]),
                                       filter(lambda item: len(item[0].split('-')) != 2, reader)))

    def process(self, data: 'list[str]') -> 'tuple[list[str], list[str]]':
        """Process CSV data.

        Args:
            data: CSV data.

        Returns:
            Enumeration fields and missing fields.

        """
        reader = csv.reader(data)
        next(reader)  # header

        enum = []  # type: list[str]
        miss = []  # type: list[str]
        for item in reader:
            long = item[1]
            rfcs = item[4]

            temp = []  # type: list[str]
            for rfc in filter(None, re.split(r'\[|\]', rfcs)):
                if 'RFC' in rfc and re.match(r'\d+', rfc[3:]):
                    #temp.append(f'[{rfc[:3]} {rfc[3:]}]')
                    temp.append(f'[:rfc:`{rfc[3:]}`]')
                else:
                    temp.append(f'[{rfc}]'.replace('_', ' '))
            lrfc = re.sub(r'( )( )*', ' ', f" {''.join(temp)}".replace('\n', ' ')) if rfcs else ''

            subd = re.sub(r'( )( )*', ' ', item[2].replace('\n', ' '))
            tmp1 = subd if item[2] else ''

            split = long.split(' (', 1)
            if len(split) == 2:
                name, cmmt = split[0], f" ({split[1]})"
            else:
                name, cmmt = long, ''
            if not name:
                name, desc = item[2], ''
            desc = self.wrap_comment(f'{tmp1}{cmmt}{lrfc}')

            try:
                code, _ = item[0], int(item[0])
                renm = self.rename(name, code, original=long)

                pres = f"{renm} = {code}"
                sufs = f"#: {desc}"

                # if len(pres) > 74:
                #     sufs = f"\n{' '*80}{sufs}"

                # enum.append(f'{pres.ljust(76)}{sufs}')
                enum.append(f'{sufs}\n    {pres}')
            except ValueError:
                start, stop = item[0].split('-')

                miss.append(f'if {start} <= value <= {stop}:')
                miss.append(f'    #: {desc}')
                miss.append(f"    return extend_enum(cls, '{name}_%d' % value, value)")
        return enum, miss



if __name__ == '__main__':
    sys.exit(TransType())  # type: ignore[arg-type]