Code completion updates for enhanced switches (IDEA-202340)

- Support inside switch expression
- Support rule-based labels
- Support break inside expression
- Suggest 'switch' keyword in expressions
- Insert ':' or '->' depending on the switch type

java/java-tests/testData/codeInsight/completion/normal/BreakInSwitchExpression.java

@@ -0,0 +1,8 @@
+public class ConstConfig {
+    int test(int x) {
+        return switch (x) {
+            case 1:
+                if (Math.random() > 0.5) br<caret>
+        };
+    }
+}

java/java-tests/testData/codeInsight/completion/normal/BreakInSwitchExpression_after.java

@@ -0,0 +1,8 @@
+public class ConstConfig {
+    int test(int x) {
+        return switch (x) {
+            case 1:
+                if (Math.random() > 0.5) break <caret>
+        };
+    }
+}

java/java-tests/testData/codeInsight/completion/normal/DefaultInRuleSwitch.java

@@ -0,0 +1,9 @@
+public class ConstConfig {
+    {
+        switch (a) {
+            case Foooo -> {}
+            def<caret>
+
+        }
+    }
+}

java/java-tests/testData/codeInsight/completion/normal/DefaultInRuleSwitch_after.java

@@ -0,0 +1,9 @@
+public class ConstConfig {
+    {
+        switch (a) {
+            case Foooo -> {}
+            default -> <caret>
+
+        }
+    }
+}

java/java-tests/testData/codeInsight/completion/normal/LabelInRuleSwitch.java

@@ -0,0 +1,11 @@
+public class ConstConfig {
+    enum X {FOO, BAR, BAZ}
+    
+    void test(X x) {
+        switch (x) {
+            case BAR -> {}
+            case BAZ -> {}
+            case FO<caret>
+        }
+    }
+}

java/java-tests/testData/codeInsight/completion/normal/LabelInRuleSwitch_after.java

@@ -0,0 +1,11 @@
+public class ConstConfig {
+    enum X {FOO, BAR, BAZ}
+    
+    void test(X x) {
+        switch (x) {
+            case BAR -> {}
+            case BAZ -> {}
+            case FOO -> <caret>
+        }
+    }
+}

java/java-tests/testData/codeInsight/completion/normal/SecondLabelInOldSwitch.java

@@ -0,0 +1,9 @@
+public class ConstConfig {
+    enum X {FOO, BAR, BAZ}
+    
+    void test(X x) {
+        switch (x) {
+            case BAR, FO<caret>: {}
+        }
+    }
+}

java/java-tests/testData/codeInsight/completion/normal/SecondLabelInOldSwitch_after.java

@@ -0,0 +1,9 @@
+public class ConstConfig {
+    enum X {FOO, BAR, BAZ}
+    
+    void test(X x) {
+        switch (x) {
+            case BAR, FOO:<caret> {}
+        }
+    }
+}

java/java-tests/testData/codeInsight/completion/normal/SecondLabelInRuleSwitch.java

@@ -0,0 +1,9 @@
+public class ConstConfig {
+    enum X {FOO, BAR, BAZ}
+    
+    void test(X x) {
+        switch (x) {
+            case BAR, FO<caret> -> {}
+        }
+    }
+}

java/java-tests/testData/codeInsight/completion/normal/SecondLabelInRuleSwitch_after.java

@@ -0,0 +1,9 @@
+public class ConstConfig {
+    enum X {FOO, BAR, BAZ}
+    
+    void test(X x) {
+        switch (x) {
+            case BAR, FOO<caret> -> {}
+        }
+    }
+}

java/java-tests/testData/codeInsight/completion/normal/SwitchExpressionStart.java

@@ -0,0 +1,5 @@
+public class ConstConfig {
+    int test(int x) {
+        return sw<caret>
+    }
+}

java/java-tests/testData/codeInsight/completion/normal/SwitchExpressionStart_after.java

@@ -0,0 +1,5 @@
+public class ConstConfig {
+    int test(int x) {
+        return switch (<caret>)
+    }
+}