Enums: Make EnumDefinition use EnumValues instead of Strings as children.

This allows us to store the index of the enum value along the name. The index can be used to compare two enum values in assembler.

Later on this might be used to enable users of KLang to set arbitrary values as the index of an enum value.

src/main/java/de/hsrm/compiler/Klang/ContextAnalysis.java

@@ -355,7 +355,7 @@ public class ContextAnalysis extends KlangBaseVisitor<Node> {
       }
 
       var enumValueName = path.get(0);
-      if (Arrays.stream(enumDef.enums).noneMatch(e -> e.equals(enumValueName))) {
+      if (Arrays.stream(enumDef.enums).noneMatch(e -> e.value.equals(enumValueName))) {
         var error = "Unknown enum value " + enumValueName + " of enum " +  enumDef.name + ".";
         throw new RuntimeException(Helper.getErrorPrefix(line, col) + error);
       }

src/main/java/de/hsrm/compiler/Klang/GetDefinitions.java

@@ -107,20 +107,26 @@ public class GetDefinitions extends KlangBaseVisitor<Node> {
         }
 
         // IDENT() includes the enumName as the first entry, which we skip
-        var enumFields = new LinkedHashSet<String>();
+        var enumValues = new LinkedHashMap<String, EnumValue>();
         for (int i = 1; i < ctx.IDENT().size(); i++) {
             var currentEnumField = ctx.IDENT(i);
             var currentEnumFieldName = currentEnumField.getText();
-            if (enumFields.contains(currentEnumFieldName)) {
             var line = currentEnumField.getSymbol().getLine();
             var col = currentEnumField.getSymbol().getCharPositionInLine();
+
+            if (enumValues.containsKey(currentEnumFieldName)) {
                 var error = " Duplicate enum value " + currentEnumFieldName + " in enum " + enumName + ".";
                 throw new RuntimeException(Helper.getErrorPrefix(line, col) + error);
             }
-            enumFields.add(currentEnumFieldName);
+
+            var enumValue = new EnumValue(currentEnumFieldName, i - 1);
+            enumValue.line = line;
+            enumValue.col = col;
+
+            enumValues.put(currentEnumFieldName, enumValue);
         }
 
-        var enumDef = new EnumDefinition(enumName, enumFields.toArray(new String[0]));
+        var enumDef = new EnumDefinition(enumName, enumValues.values().toArray(new EnumValue[0]));
         enumDef.line = ctx.start.getLine();
         enumDef.col = ctx.start.getCharPositionInLine();
         enumDef.type = new NamedType(enumName);

src/main/java/de/hsrm/compiler/Klang/nodes/EnumDefinition.java

@@ -5,9 +5,9 @@ import de.hsrm.compiler.Klang.visitors.Visitor;
 public class EnumDefinition extends Node {
 
     public String name;
-    public String[] enums;
+    public EnumValue[] enums;
 
-    public EnumDefinition(String name, String[] enums) {
+    public EnumDefinition(String name, EnumValue[] enums) {
         this.name = name;
         this.enums = enums;
     }

src/main/java/de/hsrm/compiler/Klang/nodes/EnumValue.java

@@ -0,0 +1,18 @@
+package de.hsrm.compiler.Klang.nodes;
+
+import de.hsrm.compiler.Klang.visitors.Visitor;
+
+public class EnumValue  extends Node {
+    public String value;
+    public int index;
+
+    public EnumValue(String value, int index) {
+        this.value = value;
+        this.index = index;
+    }
+
+    @Override
+    public <R> R welcome(Visitor<R> v) {
+        return v.visit(this);
+    }
+}

src/main/java/de/hsrm/compiler/Klang/visitors/EvalVisitor.java

@@ -457,6 +457,11 @@ public class EvalVisitor implements Visitor<Value> {
     return null;
   }
 
+  @Override
+  public Value visit(EnumValue e) {
+    return null;
+  }
+
   @Override
   public Value visit(StructDefinition e) {
     // We get these from a previous visitor

src/main/java/de/hsrm/compiler/Klang/visitors/GenASM.java

@@ -779,6 +779,11 @@ public class GenASM implements Visitor<Void> {
     return null;
   }
 
+  @Override
+  public Void visit(EnumValue e) {
+    return null;
+  }
+
   @Override
   public Void visit(StructDefinition e) {
     // We get these from a previous visitor

src/main/java/de/hsrm/compiler/Klang/visitors/GetVars.java

@@ -239,6 +239,11 @@ class GetVars implements Visitor<Void> {
     return null;
   }
 
+  @Override
+  public Void visit(EnumValue e) {
+    return null;
+  }
+
   @Override
   public Void visit(StructDefinition e) {
     return null;

src/main/java/de/hsrm/compiler/Klang/visitors/PrettyPrintVisitor.java

@@ -387,18 +387,24 @@ public class PrettyPrintVisitor implements Visitor<Void> {
   public Void visit(EnumDefinition e) {
     ex.write("enum " + e.name + " { ");
     var first = true;
-    for(var enumName: e.enums) {
+    for(var enumValue: e.enums) {
       if (!first) {
         ex.write(", ");
       } else {
         first = false;
       }
-      ex.write(enumName);
+      enumValue.welcome(this);
     }
     ex.write(" }");
     return null;
   }
 
+  @Override
+  public Void visit(EnumValue e) {
+    ex.write(e.value);
+    return null;
+  }
+
   @Override
   public Void visit(StructDefinition e) {
     ex.write("struct " + e.name + " {");

src/main/java/de/hsrm/compiler/Klang/visitors/Visitor.java

@@ -38,6 +38,7 @@ public interface Visitor<R> {
     R visit(Program e);
     R visit(Parameter e);
     R visit(EnumDefinition e);
+    R visit(EnumValue e);
     R visit(StructDefinition e);
     R visit(StructField e);
     R visit(MemberAccessExpression e);