✨ support for case insensitive variable usage

Author: igorkulman

PascalInterpreter/PascalInterpreter/FatalError.swift

@@ -11,9 +11,9 @@ import Foundation
 /**
  Taken from https://medium.com/@marcosantadev/how-to-test-fatalerror-in-swift-e1be9ff11a29
  */
-/*func fatalError(_ message: @autoclosure () -> String = "", file: StaticString = #file, line: UInt = #line) -> Never {
+func fatalError(_ message: @autoclosure () -> String = "", file: StaticString = #file, line: UInt = #line) -> Never {
     FatalErrorUtil.fatalErrorClosure(message(), file, line)
-}*/
+}
 
 struct FatalErrorUtil {
 

PascalInterpreter/PascalInterpreter/Semantic analyzer/SymbolTable.swift

@@ -26,11 +26,11 @@ public class ScopedSymbolTable {
     }
 
     func insert(_ symbol: Symbol) {
-        symbols[symbol.name] = symbol
+        symbols[symbol.name.lowercased()] = symbol
     }
 
     func lookup(_ name: String, currentScopeOnly: Bool = false) -> Symbol? {
-        if let symbol = symbols[name] {
+        if let symbol = symbols[name.lowercased()] {
             return symbol
         }
 

PascalInterpreter/PascalInterpreterTests/SemanticAnalyzerTests.swift

@@ -333,7 +333,7 @@ class SemanticAnalyzerTests: XCTestCase {
             function Alpha(a : integer): Integer;
             var y : integer;
             begin
-                Alpha := a + x;
+                Alpha := a + X;
             end;
 
             begin { Main }