Beginning of switchExpression for AST

resources/syntaxtreegenerator/javFiles/Switch.jav

@@ -5,7 +5,7 @@ import java.lang.Object;
 
 class SwitchStatement {
 
-    boolean switchStandard(){
+    switchStandard(){
         str = "SwitchMe";
         switch(str){
             case String s: return true;
@@ -13,7 +13,7 @@ class SwitchStatement {
         }
     }
 
-    boolean switchInteger(){
+    switchInteger(){
         i = 5;
         switch(i){
             case Integer j: 
@@ -23,7 +23,7 @@ class SwitchStatement {
         return (i==0);
     }
 
-    boolean guardedPattern(){
+    guardedPattern(){
         var i = 1;
         switch(i){
             case Integer j && j == 1: return true;
@@ -33,10 +33,20 @@ class SwitchStatement {
 
     record Coordinates(double x, double y) {}
 
-    boolean recordPattern(Object obj){
+    recordPattern(Object obj){
        switch(obj){
         case Coordinates(double lat, double lon): return true;
         default: return false;
        }
     }
-} 
+} 
+
+record SwitchExpression(int x, int y){
+
+    boolean switchStandard(str){
+        return switch(str){
+            case String s -> yield true;
+            default -> yield false;                
+        };
+    }
+}

src/main/antlr4/de/dhbwstuttgart/parser/antlr/Java17Parser.g4

@@ -530,7 +530,7 @@ statement
     | YIELD expression ';'  #yieldstmt // Java17
     | SEMI  #semistmt
     | statementExpression=expression ';'  #stmtexpression
-    | switchExpression ';'?  #switchexpressionstmt // Java17
+    | switchExpression ';'  #switchexpressionstmt // Java17
     | identifierLabel=identifier ':' statement  #labeledstmt
     ;
 
@@ -708,8 +708,10 @@ switchExpression
 
 // Java17
 switchLabeledRule
-    : CASE (expressionList | NULL_LITERAL | pattern) (ARROW | COLON) switchRuleOutcome
+    : CASE expressionList (ARROW | COLON) switchRuleOutcome  #labeledRuleExprList
-    | DEFAULT (ARROW | COLON) switchRuleOutcome
+    | CASE NULL_LITERAL (ARROW | COLON) switchRuleOutcome  #labeledRuleNull
+    | CASE pattern (ARROW | COLON) switchRuleOutcome  #labeledRulePattern
+    | DEFAULT (ARROW | COLON) switchRuleOutcome  #labeledRuleDefault
     ;
 
 // Java17

src/main/java/de/dhbwstuttgart/parser/SyntaxTreeGenerator/StatementGenerator.java

@@ -74,6 +74,7 @@ import de.dhbwstuttgart.parser.antlr.Java17Parser.SwitchLabelConstContext;
 import de.dhbwstuttgart.parser.antlr.Java17Parser.SwitchLabelContext;
 import de.dhbwstuttgart.parser.antlr.Java17Parser.SwitchLabelDefaultContext;
 import de.dhbwstuttgart.parser.antlr.Java17Parser.SwitchLabelPatternContext;
+import de.dhbwstuttgart.parser.antlr.Java17Parser.SwitchLabeledRuleContext;
 import de.dhbwstuttgart.parser.antlr.Java17Parser.SwitchexpressionstmtContext;
 import de.dhbwstuttgart.parser.antlr.Java17Parser.SwitchstmtContext;
 import de.dhbwstuttgart.parser.antlr.Java17Parser.SynchronizedstmtContext;
@@ -340,15 +341,36 @@ public class StatementGenerator {
     }
 
     private Statement convert(Java17Parser.SwitchstmtContext stmt) {
+        Expression switched = convert(stmt.parExpression().expression());
         List<SwitchBlock> switchBlocks = new ArrayList<>();
         for (SwitchBlockStatementGroupContext blockstmt : stmt.switchBlockStatementGroup()) {
             switchBlocks.add(convert(blockstmt));
         }
-        return new Switch(switchBlocks, convert(stmt.parExpression().expression()).getType(), true, stmt.getStart());
+        return new Switch(switched, switchBlocks, switched.getType(), true, stmt.getStart());
     }
 
     private Statement convert(Java17Parser.SwitchexpressionstmtContext switchexpression) {
-        // TODO
+        Expression switchExpr = convert(switchexpression.switchExpression());
+        if (switchExpr instanceof Switch s) {
+            s.setStatement();
+            return s;
+        } else {
+            // sollte nie vorkommen, da convert(Java17Parser.SwitchExpressionContext switchExpression) eine Instanz von Switch zurückgibt
+            throw new RuntimeException();
+        }
+    }
+
+    private Expression convert(Java17Parser.SwitchExpressionContext switchExpression) {
+        Expression switched = convert(switchExpression.parExpression().expression());
+        List<SwitchBlock> switchBlocks = new ArrayList<>();
+        Token offset = switchExpression.getStart();
+        for (SwitchLabeledRuleContext labeledRule : switchExpression.switchLabeledRule()) {
+            switchBlocks.add(convert(labeledRule));
+        }
+        return new Switch(switched, switchBlocks, TypePlaceholder.fresh(offset), false, offset);
+    }
+
+    private SwitchBlock convert(Java17Parser.SwitchLabeledRuleContext labeledRule) {
         throw new NotImplementedException();
     }
 
@@ -384,7 +406,7 @@ public class StatementGenerator {
         };
         Token offset = switchLabel.getStart();
         if (Objects.isNull(caseExpression)) {
-            return new SwitchLabel(null, TypePlaceholder.fresh(offset), offset);
+            return new SwitchLabel(TypePlaceholder.fresh(offset), offset);
         } else {
             return new SwitchLabel(caseExpression, caseExpression.getType(), offset);
         }

src/main/java/de/dhbwstuttgart/syntaxtree/statement/Switch.java

@@ -10,15 +10,25 @@ import de.dhbwstuttgart.syntaxtree.type.RefTypeOrTPHOrWildcardOrGeneric;
 
 public class Switch extends Statement {
 
+  private Expression switchedExpression;
   private List<SwitchBlock> blocks = new ArrayList<>();
 
-  public Switch(List<SwitchBlock> blocks, RefTypeOrTPHOrWildcardOrGeneric type, Boolean isStatement, Token offset) {
+  public Switch(Expression switched, List<SwitchBlock> blocks, RefTypeOrTPHOrWildcardOrGeneric type, Boolean isStatement, Token offset) {
     super(type, offset);
     if (isStatement)
       setStatement();
+    this.switchedExpression = switched;
     this.blocks = blocks;
   }
 
+  public Expression getSwitch() {
+    return switchedExpression;
+  }
+
+  public List<SwitchBlock> getBlocks() {
+    return blocks;
+  }
+
   @Override
   public void accept(StatementVisitor visitor) {
     // visitor.visit(this);