diff --git a/config.py b/config.py
index ee8b3c5..236167b 100644
--- a/config.py
+++ b/config.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import json
 import re
 
@@ -29,8 +31,9 @@ class Config:
     
     def __init__(self, path: str = "config.json") -> None:
         self.load(path)
-    
-    def load(self, path: str) -> None:
+
+    @staticmethod
+    def load(path: str) -> None:
         with open(path, "r") as f:
             config = json.load(f)
             
@@ -39,5 +42,6 @@ class Config:
                 if hasattr(Config, k):
                     setattr(Config, k, v)
 
+    @staticmethod
     def formatKey(key: str) -> str:
-        return re.sub(r"([a-z])([A-Z])", r"\1_\2", key).upper()
\ No newline at end of file
+        return re.sub(r"([a-z])([A-Z])", r"\1_\2", key).upper()
diff --git a/main.py b/main.py
index aa01480..64ed5a8 100755
--- a/main.py
+++ b/main.py
@@ -1,12 +1,13 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
+from __future__ import annotations
+
 import argparse
 import os
 
 from schema import InstructionSetSchema
 
-
 description = """Examples:
     - Default theme (black on white):
         python main.py schema.xml -o out.jpg
@@ -25,7 +26,7 @@ description = """Examples:
 """
 
 
-def processFile(inPath, outPath, confPath, display):
+def processFile(inPath: str, outPath: str, confPath: str, display: bool) -> None:
     schema = InstructionSetSchema(inPath, confPath, display)
     schema.save(outPath)
 
@@ -66,4 +67,4 @@ if __name__ == "__main__":
         if output is None:
             output = os.path.splitext(args.schema)[0] + ".png"
         
-        processFile(args.schema, output, args.config, args.display)
\ No newline at end of file
+        processFile(args.schema, output, args.config, args.display)
diff --git a/range.py b/range.py
index 63b4194..e0dcfb9 100644
--- a/range.py
+++ b/range.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import Union
+from typing import Union, Optional
 
 
 class Range:
@@ -9,22 +9,23 @@ class Range:
                  end: int,
                  name: str,
                  description: str = "",
-                 values: dict[str, Union[str, dict]] = None,
-                 dependsOn: str = None) -> None:
+                 values: Optional[dict[str, Union[str, dict]]] = None,
+                 dependsOn: Optional[tuple[int, int]] = None) -> None:
         
-        self.start = start
-        self.end = end
-        self.name = name
-        self.description = description
-        self.values = values
-        self.dependsOn = dependsOn
-        self.lastValueY = -1
+        self.start: int = start
+        self.end: int = end
+        self.name: str = name
+        self.description: str = description
+        self.values: Optional[dict[str, Union[str, dict]]] = values
+        self.dependsOn: Optional[tuple[int, int]] = dependsOn
+        self.lastValueY: int = -1
     
     @property
     def bits(self) -> int:
         return self.end - self.start + 1
-    
-    def load(start: int, end: int, data: dict):
+
+    @staticmethod
+    def load(start: int, end: int, data: dict) -> Range:
         values = None
         bits = end - start + 1
         
@@ -45,9 +46,11 @@ class Range:
                      values,
                      dependsOn)
 
+    @staticmethod
     def parseSpan(span: str) -> tuple[int, int]:
         startEnd = span.split("-")
-        if len(startEnd) == 1: startEnd.append(startEnd[0])
+        if len(startEnd) == 1:
+            startEnd.append(startEnd[0])
         start = int(startEnd[1])
         end = int(startEnd[0])
-        return (start, end)
\ No newline at end of file
+        return (start, end)
diff --git a/renderer.py b/renderer.py
index 22d5ab8..115dcd3 100644
--- a/renderer.py
+++ b/renderer.py
@@ -16,17 +16,23 @@ if TYPE_CHECKING:
 
 class Renderer:
     def __init__(self, config: Config, display: bool = False) -> None:
-        self.config = config
-        self.display = display
+        self.config: Config = config
+        self.display: bool = display
         pygame.init()
         if self.display:
-            self.win = pygame.display.set_mode([self.config.WIDTH, self.config.HEIGHT])
+            self.win: pygame.Surface = pygame.display.set_mode([self.config.WIDTH, self.config.HEIGHT])
         
-        self.surf = pygame.Surface([self.config.WIDTH, self.config.HEIGHT], pygame.SRCALPHA)
-        self.font = pygame.font.SysFont(self.config.DEFAULT_FONT_FAMILY, self.config.DEFAULT_FONT_SIZE)
-        self.italicFont = pygame.font.SysFont(self.config.ITALIC_FONT_FAMILY, self.config.ITALIC_FONT_SIZE, italic=True)
+        self.surf: pygame.Surface = pygame.Surface([self.config.WIDTH, self.config.HEIGHT], pygame.SRCALPHA)
+
+        self.font: pygame.font.Font = pygame.font.SysFont(
+            self.config.DEFAULT_FONT_FAMILY,
+            self.config.DEFAULT_FONT_SIZE)
+
+        self.italicFont: pygame.font.Font = pygame.font.SysFont(
+            self.config.ITALIC_FONT_FAMILY,
+            self.config.ITALIC_FONT_SIZE, italic=True)
         
-        self.margins = self.config.MARGINS
+        self.margins: list[int, int, int, int] = self.config.MARGINS
     
     def render(self, schema: InstructionSetSchema) -> None:
         self.surf.fill(self.config.BACKGROUND_COLOR)
@@ -206,8 +212,7 @@ class Renderer:
 
     def drawDependency(self,
                        struct: Structure,
-                       structures: dict[str,
-                       Structure],
+                       structures: dict[str, Structure],
                        bitsX: float,
                        bitsY: float,
                        range_: Range,
@@ -274,7 +279,7 @@ class Renderer:
                            descY + bitH - arrowMargin)
 
             prevDependY = descY + bitH*2 + arrowMargin
-            prevRangeY =prevDependY
+            prevRangeY = prevDependY
             dependRange.lastValueY = prevDependY
             descY = self.drawStructure(structures[data["structure"]], structures, rStartX, descY)
         
@@ -315,4 +320,4 @@ class Renderer:
             self.surf.blit(txt, [
                 (start.x + end.x - txt.get_width())/2,
                 (start.y + end.y)/2 + arrowLabelDist
-            ])
\ No newline at end of file
+            ])
diff --git a/schema.py b/schema.py
index 54ba976..a4a710c 100644
--- a/schema.py
+++ b/schema.py
@@ -17,9 +17,10 @@ class InstructionSetSchema:
     VALID_EXTENSIONS = ("yaml", "json", "xml")
     
     def __init__(self, path: str, configPath: str = "config.json", display: bool = False) -> None:
-        self.config = Config(configPath)
-        self.display = display
-        self.path = path
+        self.config: Config = Config(configPath)
+        self.display: bool = display
+        self.path: str = path
+        self.structures: dict[str, Structure] = {}
         self.load()
     
     def load(self) -> None:
@@ -51,4 +52,4 @@ class InstructionSetSchema:
         renderer.render(self)
         renderer.save(path)
         if self.display:
-            input("Press ENTER to quit")
\ No newline at end of file
+            input("Press ENTER to quit")
diff --git a/structure.py b/structure.py
index 1bed8a4..2f26469 100644
--- a/structure.py
+++ b/structure.py
@@ -7,14 +7,15 @@ class Structure:
     def __init__(self,
                  name: str,
                  bits: int,
-                 ranges: dict[str, Range],
+                 ranges: dict[tuple[int, int], Range],
                  start: int = 0) -> None:
         
-        self.name = name
-        self.bits = bits
-        self.ranges = ranges
-        self.start = start
-    
+        self.name: str = name
+        self.bits: int = bits
+        self.ranges: dict[tuple[int, int], Range] = ranges
+        self.start: int = start
+
+    @staticmethod
     def load(id_: str, data: dict) -> Structure:
         ranges = {}
         for rSpan, rData in data["ranges"].items():
@@ -34,4 +35,4 @@ class Structure:
 
     def getSortedRanges(self) -> list[Range]:
         ranges = self.ranges.values()
-        return list(sorted(ranges, key=lambda r: r.end))
\ No newline at end of file
+        return list(sorted(ranges, key=lambda r: r.end))
diff --git a/vec.py b/vec.py
index 6cedfaf..52a6f9c 100644
--- a/vec.py
+++ b/vec.py
@@ -5,8 +5,8 @@ from math import sqrt
 
 class Vec:
     def __init__(self, x: float = 0, y: float = 0) -> None:
-        self.x = x
-        self.y = y
+        self.x: float = x
+        self.y: float = y
     
     def __add__(self, v: Vec) -> Vec:
         return Vec(self.x+v.x, self.y+v.y)
@@ -25,5 +25,6 @@ class Vec:
     
     def norm(self) -> Vec:
         mag = self.mag()
-        if mag == 0: return Vec()
-        return self/mag
\ No newline at end of file
+        if mag == 0:
+            return Vec()
+        return self / mag
diff --git a/xml_loader.py b/xml_loader.py
index e15920e..0ed2a32 100644
--- a/xml_loader.py
+++ b/xml_loader.py
@@ -7,7 +7,9 @@ from bs4 import BeautifulSoup
 if TYPE_CHECKING:
     from io import TextIOWrapper
 
+
 class XMLLoader:
+    @staticmethod
     def load(file_: TextIOWrapper) -> dict:
         schema = {}
         bs = BeautifulSoup(file_.read(), "xml")
@@ -19,10 +21,12 @@ class XMLLoader:
         
         schema["structures"] = structures
         return schema
-    
+
+    @staticmethod
     def parseStructure(structElmt: any) -> dict:
-        struct = {}
-        struct["bits"] = structElmt.get("bits")
+        struct = {
+            "bits": structElmt.get("bits")
+        }
         ranges = {}
         rangeElmts = structElmt.findAll("range")
         for rangeElmt in rangeElmts:
@@ -32,11 +36,14 @@ class XMLLoader:
         struct["ranges"] = ranges
         return struct
 
+    @staticmethod
     def parseRange(rangeElmt: any) -> dict:
-        range_ = {}
-        range_["name"] = rangeElmt.get("name")
+        range_ = {
+            "name": rangeElmt.get("name")
+        }
         desc = rangeElmt.find("description")
-        if desc is not None: range_["description"] = desc.getText()
+        if desc is not None:
+            range_["description"] = desc.getText()
         
         valuesElmt = rangeElmt.find("values")
         if valuesElmt is not None:
@@ -47,6 +54,7 @@ class XMLLoader:
         
         return range_
 
+    @staticmethod
     def parseValues(valuesElmt: any) -> dict:
         values = {}
         caseElmts = valuesElmt.findAll("case")
@@ -64,4 +72,4 @@ class XMLLoader:
             else:
                 values[val] = desc
 
-        return values
\ No newline at end of file
+        return values