From 57fd4cd8c343c2b94a563cac3032eeea4226996a Mon Sep 17 00:00:00 2001
From: Stefano Pigozzi <ste.pigozzi@gmail.com>
Date: Wed, 28 Oct 2020 18:00:11 +0100
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20Implement=20toml=20and=20json=20Scr?=
 =?UTF-8?q?olls?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 royalnet/scroll/__init__.py | 32 ++++++++++++++++++++++++++++++++
 royalnet/scroll/errors.py   |  5 +++++
 2 files changed, 37 insertions(+)

diff --git a/royalnet/scroll/__init__.py b/royalnet/scroll/__init__.py
index 54dc963f..99fc3444 100644
--- a/royalnet/scroll/__init__.py
+++ b/royalnet/scroll/__init__.py
@@ -2,6 +2,8 @@ from royalnet.typing import *
 import os
 import json
 import re
+import toml
+import json
 
 from .errors import *
 
@@ -11,10 +13,40 @@ class Scroll:
 
     key_validator = re.compile(r"^[A-Z.]+$")
 
+    loaders = {
+        ".json": json.load,
+        ".toml": toml.load
+    }
+
     def __init__(self, namespace: str, config: Optional[Dict[str, JSON]] = None):
         self.namespace: str = namespace
         self.config: Optional[Dict[str, JSON]] = config
 
+    @classmethod
+    def from_toml(cls, namespace: str, file_path: os.PathLike):
+        with open(file_path) as file:
+            config = toml.load(file)
+        return cls(namespace, config)
+
+    @classmethod
+    def from_json(cls, namespace: str, file_path: os.PathLike):
+        with open(file_path) as file:
+            config = json.load(file)
+        return cls(namespace, config)
+
+    @classmethod
+    def from_file(cls, namespace: str, file_path: os.PathLike):
+        file, ext = os.path.splitext(file_path)
+        lext = ext.lower()
+
+        with open(file_path) as file:
+            try:
+                config = cls.loaders[lext](file)
+            except KeyError:
+                raise InvalidFileType(f"Invalid extension: {lext}")
+
+        return cls(namespace, config)
+
     @classmethod
     def _validate_key(cls, item: str):
         check = cls.key_validator.match(item)
diff --git a/royalnet/scroll/errors.py b/royalnet/scroll/errors.py
index 229e8322..eeeb40bd 100644
--- a/royalnet/scroll/errors.py
+++ b/royalnet/scroll/errors.py
@@ -17,9 +17,14 @@ class ParseError(ScrollException):
     """The config value could not be parsed correctly."""
 
 
+class InvalidFileType(ParseError):
+    """The type of the specified config file is not currently supported."""
+
+
 __all__ = (
     "ScrollException",
     "NotFoundError",
     "InvalidFormatError",
     "ParseError",
+    "InvalidFileType",
 )