json parser

jsonparser.py

from parser import (
    a,
    sepby,
    maybe,
    many,
    string,
    java_float,
    java_int,
    const,
    forward_decl,
    finished,
)
import logging

logging.basicConfig(level=logging.INFO)


def mk_obj(members):
    if not members:
        return {}
    return dict(members)


def mk_array(items):
    if not items:
        return []
    return list(items)


true = a("true") >> const(True)
false = a("false") >> const(False)
null = a("null") >> const(None)
number = java_int | java_float.named("number")

value = forward_decl().named("value")

member = (string + ~a(":") + value).named("member")

json_object = (~a("{") + maybe(sepby(member, a(","))) + ~a("}")) >> mk_obj
json_object.name = "json_object"

json_array = (~a("[") + maybe(sepby(value, a(","))) + ~a("]")) >> mk_array
json_array.name = "json_list"

value.define(null | true | false | string | number | json_object | json_array)
jsonparser = (json_array | json_object) + ~finished


def loads(text: str):
    return jsonparser.parse(text)