knex 0.2.21

Python library for building composable text parsers

KNEX

Python library for creating chainable data transformers.

Installation

pip install knex

Usage

>>> from knex.parsers import *
>>>
>>> input_data = """
... Interface             IP-Address      OK?    Method Status          Protocol
... GigabitEthernet0/1    unassigned      YES    unset  up              up
... GigabitEthernet0/2    192.168.190.235 YES    unset  up              up
... GigabitEthernet0/3    unassigned      YES    unset  up              up
... GigabitEthernet0/4    192.168.191.2   YES    unset  up              up
... TenGigabitEthernet2/1 unassigned      YES    unset  up              up
... Virtual36             unassigned      YES    unset  up              up
... """
>>>
>>> pattern = r"\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b"
>>>
>>> end = (
                Start(input_data)
                > RegexExtractAll(pattern)
                > GetIndex(0)
                > Concat("", "/24")
                > IpNetwork()
             )
>>>
>>> print(end.result)
192.168.190.0/24
>>> print(json.dumps(end.history, indent=4))
[
    {
        "parser": "RegexExtractAll",
        "input": "...omitted for brevity...",
        "args": {
            "pattern": "\\b\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\b"
        },
        "error": false,
        "output": [
            "192.168.190.235",
            "192.168.191.2"
        ]
    },
    {
        "parser": "GetIndex",
        "input": [
            "192.168.190.235",
            "192.168.191.2"
        ],
        "args": {
            "idx": 0
        },
        "error": false,
        "output": "192.168.190.235"
    },
    {
        "parser": "Concat",
        "input": "192.168.190.235",
        "args": {
            "prefix": "",
            "suffix": "/24"
        },
        "error": false,
        "output": "192.168.190.235/24"
    },
    {
        "parser": "IpNetwork",
        "input": "192.168.190.235/24",
        "args": {},
        "error": false,
        "output": "192.168.190.0/24"
    }
]
>>>

Development

Environment Setup

1. Install Poetry
2. Clone the repo: git clone https://github.com/clay584/knex && cd knex
3. Install pre-requisits for developement: poetry install
4. Activate the environment: poetry shell
5. Install git pre-commit hook: pre-commit install && pre-commit autoupdate

Making Changes

1. Run tests and validate coverage: pytest -v --cov=knex --cov-report html tests
2. Commit all changes, and have clean git repo on main branch.
3. Bump version: bump2version <major|minor|patch>
4. Push to git: git push && git push --tags
5. Build for PyPI: Automatically done by Github Actions when a tag is pushed.
6. Publish to PyPI: Automatically done by Github Actions when a tag is pushed.