global variables

compiler/Parser.cs

@@ -121,6 +121,21 @@ public sealed class Parser(string fileName, List<Token> tokens)
             return new NodeDefinitionStruct(TokensFrom(startIndex), exported, packed, name, fields);
         }
 
+        if (TryExpectKeyword(Keyword.Let))
+        {
+            var exported = modifiers.Remove(Keyword.Export);
+
+            foreach (var modifier in modifiers)
+                // todo(nub31): Add to diagnostics instead of throwing
+                throw new CompileException(Diagnostic.Error("Invalid modifier for global variable").At(fileName, modifier.Value).Build());
+
+            var name = ExpectIdent();
+            ExpectSymbol(Symbol.Colon);
+            var type = ParseType();
+
+            return new NodeDefinitionGlobalVariable(TokensFrom(startIndex), exported, name, type);
+        }
+
         throw new CompileException(Diagnostic.Error("Not a valid definition").At(fileName, Peek()).Build());
     }
 
@@ -622,6 +637,13 @@ public sealed class NodeDefinitionStruct(List<Token> tokens, bool exported, bool
     }
 }
 
+public sealed class NodeDefinitionGlobalVariable(List<Token> tokens, bool exported, TokenIdent name, NodeType type) : NodeDefinition(tokens)
+{
+    public bool Exported { get; } = exported;
+    public TokenIdent Name { get; } = name;
+    public NodeType Type { get; } = type;
+}
+
 public abstract class NodeStatement(List<Token> tokens) : Node(tokens);
 
 public sealed class NodeStatementBlock(List<Token> tokens, List<NodeStatement> statements) : NodeStatement(tokens)