Cleaned up and refactored some code

src/ShaderDirectiveParser.gd

@@ -0,0 +1,23 @@
+extends Node
+
+var _load_regex: RegEx
+var _load_additional_regex: RegEx
+
+func _ready():
+	self._load_regex = RegEx.new()
+	self._load_additional_regex = RegEx.new()
+	self._load_regex.compile(r'\/\/!load\s(.*)')
+	self._load_additional_regex.compile(r'\/\/!load\+\s(\w*)\s(.*)')
+
+func parse_load_directive(shader: Shader) -> PackedStringArray:
+	var regex_match = self._load_regex.search(Filesystem.shader.code)
+	if regex_match == null: # Error!
+		printerr("Didn't find any load directives!")
+		return []
+	return regex_match.strings
+
+func parse_load_additional_directive(shader: Shader) -> Array[PackedStringArray]:
+	var results : Array[PackedStringArray] = []
+	for m in self._load_additional_regex.search_all(shader.code):
+		results.append(m.strings)
+	return results