Python bindings: PEP8 mandates two blank lines before class

[babeltrace.git] / bindings / python / common.py

# common.py
#
# Babeltrace Python module common definitions
#
# Copyright 2012-2015 EfficiOS Inc.
#
# Author: Danny Serres <danny.serres@efficios.com>
# Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.


class CTFStringEncoding:
    """
    CTF string encodings.
    """

    #: None
    NONE = 0

    #: UTF-8
    UTF8 = 1

    #: ASCII
    ASCII = 2

    #: Unknown
    UNKNOWN = 3


# Based on the enum in ctf-writer/writer.h
class ByteOrder:
    """
    Byte orders.
    """

    #: Native byte order
    BYTE_ORDER_NATIVE = 0

    #: Little-endian
    BYTE_ORDER_LITTLE_ENDIAN = 1

    #: Big-endian
    BYTE_ORDER_BIG_ENDIAN = 2

    #: Network byte order (big-endian)
    BYTE_ORDER_NETWORK = 3

    #: Unknown byte order
    BYTE_ORDER_UNKNOWN = 4  # Python-specific entry


# enum equivalent, accessible constants
# These are taken directly from ctf/events.h
# All changes to enums must also be made here
class CTFTypeId:
    """
    CTF numeric type identifiers.
    """

    #: Unknown type
    UNKNOWN = 0

    #: Integer
    INTEGER = 1

    #: Floating point number
    FLOAT = 2

    #: Enumeration
    ENUM = 3

    #: String
    STRING = 4

    #: Structure
    STRUCT = 5

    #: Untagged variant
    UNTAGGED_VARIANT = 6

    #: Variant
    VARIANT = 7

    #: Array
    ARRAY = 8

    #: Sequence
    SEQUENCE = 9

    NR_CTF_TYPES = 10

    def type_name(id):
        """
        Returns the name of the CTF numeric type identifier *id*.
        """

        name = "UNKNOWN_TYPE"
        constants = [
            attr for attr in dir(CTFTypeId) if not callable(
                getattr(
                    CTFTypeId,
                    attr)) and not attr.startswith("__")]

        for attr in constants:
            if getattr(CTFTypeId, attr) == id:
                name = attr
                break

        return name


class CTFScope:
    """
    CTF scopes.
    """

    #: Packet header
    TRACE_PACKET_HEADER = 0

    #: Packet context
    STREAM_PACKET_CONTEXT = 1

    #: Event header
    STREAM_EVENT_HEADER = 2

    #: Stream event context
    STREAM_EVENT_CONTEXT = 3

    #: Event context
    EVENT_CONTEXT = 4

    #: Event fields
    EVENT_FIELDS = 5

    def scope_name(scope):
        """
        Returns the name of the CTF scope *scope*.
        """

        name = "UNKNOWN_SCOPE"
        constants = [
            attr for attr in dir(CTFScope) if not callable(
                getattr(
                    CTFScope,
                    attr)) and not attr.startswith("__")]

        for attr in constants:
            if getattr(CTFScope, attr) == scope:
                name = attr
                break

        return name