fix: workaround for typealias parsing causing crash

CHANGELOG.md

@@ -1,6 +1,10 @@
 # Sourcery CHANGELOG
 
 ---
+## 0.4.6
+
+### Bug Fixes
+- Typealiases parsing could cause crash, implemented a workaround for that until we can find a little more reliable solution
 
 ## 0.4.5
 

Sourcery.podspec

@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
 
   s.name         = "Sourcery"
-  s.version      = "0.4.5"
+  s.version      = "0.4.6"
   s.summary      = "A tool that brings meta-programming to Swift, allowing you to code generate Swift code."
 
   s.description  = <<-DESC

Sourcery/Parsing/Parser.swift

@@ -587,23 +587,24 @@ extension Parser {
 
         // replace all processed substructures with whitespaces so that we don't process their typealiases again
         for substructure in processed {
-            if let range = SubstringIdentifier.key.range(for: substructure)
-                .flatMap({ contentToParse.byteRangeToNSRange(start: Int($0.offset), length: Int($0.length)) }) {
+            if let substring = extract(.key, from: substructure) {
 
-                let replacement = String(repeating: " ", count: range.length)
-                contentToParse = contentToParse.bridge().replacingCharacters(in: range, with: replacement)
+                let replacementCharacter = " "
+                let count = substring.lengthOfBytes(using: .utf8) / replacementCharacter.lengthOfBytes(using: .utf8)
+                let replacement = String(repeating: replacementCharacter, count: count)
+                contentToParse = contentToParse.bridge().replacingOccurrences(of: substring, with: replacement)
             }
         }
 
-        if containingType != nil {
-            if let body = extract(.body, from: source, contents: contentToParse) {
-                return parseTypealiases(SyntaxMap(file: File(contents: body)).tokens, contents: body)
-            } else {
-                return []
-            }
-        } else {
+        guard containingType != nil else {
             return parseTypealiases(SyntaxMap(file: File(contents: contentToParse)).tokens, contents: contentToParse)
         }
+
+        if let body = extract(.body, from: source, contents: contentToParse) {
+            return parseTypealiases(SyntaxMap(file: File(contents: body)).tokens, contents: body)
+        } else {
+            return []
+        }
     }
 
     private func parseTypealiases(_ tokens: [SyntaxToken], contents: String, existingTypealiases: [Typealias] = []) -> [Typealias] {

Sourcery/Sourcery.swift

@@ -37,7 +37,7 @@ internal class SourceryTemplate: Template {
 /// If you specify templatePath as a folder, it will create a Generated[TemplateName].swift file
 /// If you specify templatePath as specific file, it will put all generated results into that single file
 public class Sourcery {
-    public static let version: String = inUnitTests ? "Major.Minor.Patch" : "0.4.5"
+    public static let version: String = inUnitTests ? "Major.Minor.Patch" : "0.4.6"
     public static let generationMarker: String = "// Generated using Sourcery"
 
     let verbose: Bool