repo: init

asjsonp/__init__.py

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+from asjsonp.module import loads
+
+
+__all__ = ["loads"]

asjsonp/__main__.py

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+from asjsonp.module import loads
+
+
+print(loads(open("test.json", "r").read()))

asjsonp/module.py

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+__all__ = ["loads"]
+
+
+def js2py(obj: str):
+    """
+    Convert a JSON string to a Python object.
+
+    This follows the simple approach defined in https://docs.python.org/3/library/json.html#encoders-and-decoders
+    """
+    if obj == "true":
+        return True
+    elif obj == "false":
+        return False
+    elif obj == "null":
+        return None
+    elif obj == "NaN":
+        return float("nan")
+    elif obj == "Infinity":
+        return float("inf")
+    elif obj == "-Infinity":
+        return float("-inf")
+    elif obj.isnumeric():
+        return int(obj)
+    elif obj.lower().replace(".", "").replace("e", "").replace("-", "").isnumeric():
+        return float(obj)
+    else:
+        raise ValueError(f"Invalid JSON value: {obj}")
+
+
+def loads(s: str):
+    result: list | dict = []
+    first_open: bool = False
+    multiple_object_root: bool = False
+    parents: list = []
+    current: dict | list = result
+    dict_current_key: str = None
+    dict_reading_value: str = None
+    # Set the value so Pylance can be happy.
+    current_text: str = ""
+    is_reading_string: bool = False
+    # Ignore the rest of the string line if it's a comment
+    prev_char: str = ""
+    ignore_rest: bool = False
+
+    def handle_reading_value():
+        nonlocal dict_reading_value
+        nonlocal dict_current_key
+        if dict_reading_value is not None and dict_reading_value.strip():
+            value = js2py(dict_reading_value)
+            if dict_current_key:
+                current[dict_current_key] = value
+            else:
+                current.append(value)
+            dict_reading_value = None
+            dict_current_key = None
+
+    for char in s:
+        if ignore_rest:
+            if char == "\n":
+                ignore_rest = False
+        elif is_reading_string:
+            # Handle string closing quote
+            if char == '"':
+                is_reading_string = False
+                if isinstance(current, dict):
+                    if not dict_current_key:
+                        dict_current_key = current_text
+                    else:
+                        current[dict_current_key] = current_text
+                        dict_current_key = None
+                        dict_reading_value = None
+                else:
+                    current.append(current_text)
+                    dict_reading_value = None
+                current_text = ""
+            else:
+                current_text += char
+        # Handle object & array types
+        elif char in ["{", "["]:
+            obj: dict | list
+            match char:
+                case "{":
+                    if not first_open:
+                        first_open = True
+                    obj = {}
+                case "[":
+                    if not first_open:
+                        first_open = True
+                        multiple_object_root = True
+                    obj = []
+            if isinstance(current, list):
+                current.append(obj)
+            elif isinstance(current, dict):
+                current[dict_current_key] = obj
+            parents.append(current)
+            # Reference to the current dict
+            if isinstance(current, list):
+                current = current[-1]
+            elif isinstance(current, dict):
+                current = current[dict_current_key]
+                dict_current_key = None
+        # Handle object and array closing bracket
+        elif char in ["}", "]"]:
+            # Switch reference back to the parent dict
+            handle_reading_value()
+            current = parents.pop()
+        # Handle string opening quote
+        elif char == '"':
+            is_reading_string = True
+            current_text = ""
+        elif char == ":":
+            dict_reading_value = ""
+        elif char == ",":
+            handle_reading_value()
+        elif char == "/":
+            if prev_char == "/":
+                ignore_rest = True
+        else:
+            if dict_reading_value is not None:
+                if char.strip():
+                    dict_reading_value += char
+        prev_char = char
+    if not multiple_object_root:
+        result = result[0]
+    return result