circuitpython/tests/extmod/json_load_readinto.py

import json

# Test that json can load from any object with readinto


class Buffer:
    def __init__(self, data):
        self._data = data
        self._i = 0

    def readinto(self, buf):
        end = self._i + len(buf)
        remaining = len(self._data) - self._i
        end = min(end, len(self._data))
        l = min(len(buf), remaining)
        buf[:l] = self._data[self._i : end]
        self._i += l
        return l


print(json.load(Buffer(b"null")))
print(json.load(Buffer(b'"abc\\u0064e"')))
print(json.load(Buffer(b"[false, true, 1, -2]")))
print(json.load(Buffer(b'{"a":true}')))