A Rust implementation of the Zish format

A Rust library for the Zish format, released under the Unlicense.

Table of Contents

Quickstart
Running The Tests
Release Notes

Quickstart

To go from a Python object to an Zish string use zish.dumps. To go from an Zish string to a Python object use zish.loads. Eg.

>>> from zish import loads, dumps
>>> from datetime import datetime, timezone
>>> from decimal import Decimal
>>>
>>> # Take a Python object
>>> book = {
...     'title': 'A Hero of Our Time',
...     'read_date': datetime(2017, 7, 16, 14, 5, tzinfo=timezone.utc),
...     'would_recommend': True,
...     'description': None,
...     'number_of_novellas': 5,
...     'price': Decimal('7.99'),
...     'weight': 6.88,
...     'key': b'kshhgrl',
...     'tags': ['russian', 'novel', '19th century']}
>>>
>>> # Output it as an Zish string
>>> zish_str = dumps(book)
>>> print(zish_str)
{
  "description": null,
  "key": 'a3NoaGdybA==',
  "number_of_novellas": 5,
  "price": 7.99,
  "read_date": 2017-07-16T14:05:00Z,
  "tags": [
    "russian",
    "novel",
    "19th century",
  ],
  "title": "A Hero of Our Time",
  "weight": 6.88,
  "would_recommend": true,
}
>>>
>>> # Load the Zish string, to give us back the Python object
>>> reloaded_book = loads(zish_str)
>>>
>>> # Print the title
>>> print(reloaded_book['title'])
A Hero of Our Time

Table 1. Python to Zish type mapping

Python Type	Zish Type
bool	bool
int	integer
str	string
datetime.datetime	timestamp
dict	map
decimal.Decimal	decimal
float	decimal
bytearray, bytes	bytes
list, tuple	list

Running The Tests

Change to the zish directory: cd zish
Create a virtual environment: virtualenv --python=python3 venv
Activate the virtual environment: source venv/bin/activate
Install tox: pip install tox
Run tox: tox

Making A New Release

Run tox to make sure all tests pass, then update the Release Notes section then do:

git tag -a x.y.z -m "version x.y.z"
rm -r build
rm -r dist
python setup.py sdist bdist_wheel --python-tag py3
for f in dist/*; do gpg --detach-sign -a $f; done
twine upload dist/*

Release Notes

Version 0.1.9 (2021-04-05)

Allow trailing commas in maps and lists.

Version 0.1.8 (2020-06-25)

Make dumps sort the set type before outputing as a list.

Version 0.1.7 (2020-02-11)

Use 1-based line and character numbers, rather than zero-based.
Arrow time library upgraded.
Line and character numbers now available in errors

Version 0.1.6 (2018-11-12)

Better error message when parsing an empty string.

Version 0.1.5 (2018-10-30)

Fix new Flake8 errors.

Version 0.1.4 (2018-10-30)

Better error message if there’s a duplicate key in a map.

Version 0.1.3 (2018-10-30)

An exception is thrown if there’s a duplicate key in a map.

Version 0.1.2 (2018-09-04)

Change formatting for map and list in dumps. The trailing } and ] are now on a line down and at the original index.

Version 0.1.1 (2018-03-13)

A decimal with an uppercase 'E' in the exponent wasn’t being recognized.

Version 0.1.0 (2018-01-29)

A map key can’t be null, following change in spec.

Version 0.0.26 (2018-01-29)

Remove '//' as a comment, following change in spec.
Allow 'e' and 'E' in the exponent of a decimal, following change in spec.

Version 0.0.25 (2018-01-12)

Better error message when the end of the document is reached without a map being closed.

Version 0.0.24 (2018-01-11)

Fix bug where an integer after a value (and before a ',' or '}') in a map doesn’t give a good error.

Version 0.0.23 (2018-01-09)

A map key can’t now be a list or a map.

Version 0.0.22 (2018-01-08)

A map key can now be of any type.
The 'set' type has been removed from Zish.
Zish now recognizes the full set of Unicode EOL sequences.
The 'float' type has been removed from Zish.
Fixed bug when sorting map with keys of more than one type.

Version 0.0.21 (2018-01-04)

Give a better error if the end of the document is reached before a map is completed.

Version 0.0.20 (2018-01-04)

Give an error if there are multiple top-level values, rather than silently truncating.

Version 0.0.19 (2017-09-27)

Decimal exponent dumped as E rather than d.

Version 0.0.18 (2017-09-12)

Add tests for float formatting.

Version 0.0.17 (2017-09-12)

Tighten up parsing of container types.
Make sure floats are formatted without an uppercase E.

Version 0.0.16 (2017-09-06)

Allow lists and sets as keys.

Version 0.0.15 (2017-09-05)

Fixed map parsing bug where an error wasn’t reported properly if it was expecting a : but got an integer.

Version 0.0.14 (2017-09-05)

Fixed bug where sets couldn’t be formatted.

Version 0.0.13 (2017-08-30)

Performance improvement.

Version 0.0.12 (2017-08-30)

Add Travis configuration.

Version 0.0.11 (2017-08-30)

Give a better error message if a string isn’t closed.

Version 0.0.10 (2017-08-29)

New native parser that doesn’t use antlr. It’s about twice as fast.

Version 0.0.9 (2017-08-24)

Fix bug where int was being parsed as Decimal.
Make bytes type return a bytes rather than a bytearray.

Version 0.0.8 (2017-08-24)

Container types aren’t allowed as map keys.
Performance improvements.

Version 0.0.7 (2017-08-22)

Fix bug with UTC timestamp formatting.

Version 0.0.6 (2017-08-22)

Fix bug in timestamp formatting.
Add note about comments.

Version 0.0.5 (2017-08-18)

Fix bug where dumps fails for a tuple.

Version 0.0.4 (2017-08-15)

Simplify integer types.

Version 0.0.3 (2017-08-09)

Fixed bug where interpreter couldn’t find the zish.antlr package in eggs.
Removed a few superfluous escape sequences.

Version 0.0.2 (2017-08-05)

Now uses RFC3339 for timestamps.

Version 0.0.1 (2017-08-03)

Fix bug where an EOF could cause an infinite loop.

Version 0.0.0 (2017-08-01)

First public release. Passes all the tests.

tlocke/zish_rust