Qute message bundles: fix localization of enums

- support constants with underscores
- fixes #44866

docs/src/main/asciidoc/qute-reference.adoc

@@ -3007,10 +3007,9 @@ If there is a message bundle method that accepts a single parameter of an enum t
 @Message <1>
 String methodName(MyEnum enum);
 ----
-<1> The value is intentionally not provided. There's also no key for the method in a localized file.
-
-Then it receives a generated template:
+<1> The value is intentionally not provided. There's also no key/value pair for this method in a localized file.
 
+Then it receives a generated template like:
 [source,html]
 ----
 {#when enumParamName}
@@ -3019,15 +3018,27 @@ Then it receives a generated template:
 {/when}
 ----
 
-Furthermore, a special message method is generated for each enum constant. Finally, each localized file must contain keys and values for all constant message keys:
+Furthermore, a special message method is generated for each enum constant. 
+Finally, each localized file must contain keys and values for all enum constants:
 
 [source,poperties]
 ----
 methodName_CONSTANT1=Value 1
 methodName_CONSTANT2=Value 2
 ----
 
-In a template, an enum constant can be localized with a message bundle method like `{msg:methodName(enumConstant)}`.
+// We need to escape the first underscore 
+// See https://docs.asciidoctor.org/asciidoc/latest/subs/prevent/
+[IMPORTANT] 
+.Message keys for enum constants
+==== 
+By default, the message key consists of the method name followed by the `\_` separator and the constant name.
+If any constant name of a particular enum contains the `_` or the `$` character then the `\_$` separator must be used for all message keys for this enum instead.
+For example, `methodName_$CONSTANT_1=Value 1` or `methodName_$CONSTANT$1=Value 1`.
+A constant of a localized enum may not contain the `_$` separator.
+====
+
+In a template, the localized message for an enum constant can be obtained with a message bundle method like `{msg:methodName(enumConstant)}`.
 
 TIP: There is also <<convenient-annotation-for-enums,`@TemplateEnum`>> - a convenient annotation to access enum constants in a template.
 

extensions/qute/deployment/src/main/java/io/quarkus/qute/deployment/MessageBundleProcessor.java

@@ -865,16 +865,20 @@ private Map<String, String> parseKeyToTemplateFromLocalizedFile(ClassInfo bundle
      * @param key
      * @param bundleInterface
      * @return {@code true} if the given key represents an enum constant message key, such as {@code myEnum_CONSTANT1}
-     * @see #toEnumConstantKey(String, String)
      */
     boolean isEnumConstantMessageKey(String key, IndexView index, ClassInfo bundleInterface) {
         if (key.isBlank()) {
             return false;
         }
-        int lastIdx = key.lastIndexOf("_");
+        return isEnumConstantMessageKey("_$", key, index, bundleInterface)
+                || isEnumConstantMessageKey("_", key, index, bundleInterface);
+    }
+
+    private boolean isEnumConstantMessageKey(String separator, String key, IndexView index, ClassInfo bundleInterface) {
+        int lastIdx = key.lastIndexOf(separator);
         if (lastIdx != -1 && lastIdx != key.length()) {
             String methodName = key.substring(0, lastIdx);
-            String constant = key.substring(lastIdx + 1, key.length());
+            String constant = key.substring(lastIdx + separator.length(), key.length());
             MethodInfo method = messageBundleMethod(bundleInterface, methodName);
             if (method != null && method.parametersCount() == 1) {
                 Type paramType = method.parameterType(0);
@@ -1021,11 +1025,12 @@ private String generateImplementation(MessageBundleBuildItem bundle, ClassInfo d
             // We need some special handling for enum message bundle methods
             // A message bundle method that accepts an enum and has no message template receives a generated template:
             // {#when enumParamName}
-            //   {#is CONSTANT1}{msg:org_acme_MyEnum_CONSTANT1}
-            //   {#is CONSTANT2}{msg:org_acme_MyEnum_CONSTANT2}
+            //   {#is CONSTANT_1}{msg:myEnum_$CONSTANT_1}
+            //   {#is CONSTANT_2}{msg:myEnum_$CONSTANT_2}
             //   ...
             // {/when}
             // Furthermore, a special message method is generated for each enum constant
+            // These methods are used to handle the {msg:myEnum$CONSTANT_1} and {msg:myEnum$CONSTANT_2}
             if (messageTemplate == null && method.parametersCount() == 1) {
                 Type paramType = method.parameterType(0);
                 if (paramType.kind() == org.jboss.jandex.Type.Kind.CLASS) {
@@ -1036,9 +1041,12 @@ private String generateImplementation(MessageBundleBuildItem bundle, ClassInfo d
                                 .append("}");
                         Set<String> enumConstants = maybeEnum.fields().stream().filter(FieldInfo::isEnumConstant)
                                 .map(FieldInfo::name).collect(Collectors.toSet());
+                        String separator = enumConstantSeparator(enumConstants);
                         for (String enumConstant : enumConstants) {
-                            // org_acme_MyEnum_CONSTANT1
-                            String enumConstantKey = toEnumConstantKey(method.name(), enumConstant);
+                            // myEnum_CONSTANT
+                            // myEnum_$CONSTANT_1
+                            // myEnum_$CONSTANT$NEXT
+                            String enumConstantKey = toEnumConstantKey(method.name(), separator, enumConstant);
                             String enumConstantTemplate = messageTemplates.get(enumConstantKey);
                             if (enumConstantTemplate == null) {
                                 throw new TemplateException(
@@ -1052,6 +1060,10 @@ private String generateImplementation(MessageBundleBuildItem bundle, ClassInfo d
                                     .append(":")
                                     .append(enumConstantKey)
                                     .append("}");
+                            // For each constant we generate a method:
+                            // myEnum_CONSTANT(MyEnum val)
+                            // myEnum_$CONSTANT_1(MyEnum val)
+                            // myEnum_$CONSTANT$NEXT(MyEnum val)
                             generateEnumConstantMessageMethod(bundleCreator, bundleName, locale, bundleInterface,
                                     defaultBundleInterface, enumConstantKey, keyMap, enumConstantTemplate,
                                     messageTemplateMethods);
@@ -1132,8 +1144,21 @@ private String generateImplementation(MessageBundleBuildItem bundle, ClassInfo d
         return generatedName.replace('/', '.');
     }
 
-    private String toEnumConstantKey(String methodName, String enumConstant) {
-        return methodName + "_" + enumConstant;
+    private String enumConstantSeparator(Set<String> enumConstants) {
+        for (String constant : enumConstants) {
+            if (constant.contains("_$")) {
+                throw new MessageBundleException("A constant of a localized enum may not contain '_$': " + constant);
+            }
+            if (constant.contains("$") || constant.contains("_")) {
+                // If any of the constants contains "_" or "$" then "_$" is used
+                return "_$";
+            }
+        }
+        return "_";
+    }
+
+    private String toEnumConstantKey(String methodName, String separator, String enumConstant) {
+        return methodName + separator + enumConstant;
     }
 
     private void generateEnumConstantMessageMethod(ClassCreator bundleCreator, String bundleName, String locale,
@@ -1165,7 +1190,7 @@ private void generateEnumConstantMessageMethod(ClassCreator bundleCreator, Strin
             // No expression/tag - no need to use qute
             enumConstantMethod.returnValue(enumConstantMethod.load(messageTemplate));
         } else {
-            // Obtain the template, e.g. msg_org_acme_MyEnum_CONSTANT1
+            // Obtain the template, e.g. msg_myEnum$CONSTANT_1
             ResultHandle template = enumConstantMethod.invokeStaticMethod(
                     io.quarkus.qute.deployment.Descriptors.BUNDLES_GET_TEMPLATE,
                     enumConstantMethod.load(templateId));

extensions/qute/deployment/src/test/java/io/quarkus/qute/deployment/i18n/MessageBundleEnumTest.java

@@ -9,6 +9,7 @@
 import org.junit.jupiter.api.extension.RegisterExtension;
 
 import io.quarkus.qute.Template;
+import io.quarkus.qute.TemplateEnum;
 import io.quarkus.qute.i18n.Message;
 import io.quarkus.qute.i18n.MessageBundle;
 import io.quarkus.test.QuarkusUnitTest;
@@ -18,24 +19,47 @@ public class MessageBundleEnumTest {
     @RegisterExtension
     static final QuarkusUnitTest config = new QuarkusUnitTest()
             .withApplicationRoot((jar) -> jar
-                    .addClasses(Messages.class, MyEnum.class)
+                    .addClasses(Messages.class, MyEnum.class, UnderscoredEnum.class, AnotherUnderscoredEnum.class)
                     .addAsResource("messages/enu.properties")
                     .addAsResource("messages/enu_cs.properties")
                     .addAsResource(new StringAsset(
                             "{enu:myEnum(MyEnum:ON)}::{enu:myEnum(MyEnum:OFF)}::{enu:myEnum(MyEnum:UNDEFINED)}::"
                                     + "{enu:shortEnum(MyEnum:ON)}::{enu:shortEnum(MyEnum:OFF)}::{enu:shortEnum(MyEnum:UNDEFINED)}::"
                                     + "{enu:foo(MyEnum:ON)}::{enu:foo(MyEnum:OFF)}::{enu:foo(MyEnum:UNDEFINED)}::"
                                     + "{enu:locFileOverride(MyEnum:ON)}::{enu:locFileOverride(MyEnum:OFF)}::{enu:locFileOverride(MyEnum:UNDEFINED)}"),
-                            "templates/foo.html"));
+                            "templates/foo.html")
+                    .addAsResource(new StringAsset(
+                            "{enu:underscored(UnderscoredEnum:A_B)}::{enu:underscored(UnderscoredEnum:FOO_BAR_BAZ)}::{enu:underscored_foo(AnotherUnderscoredEnum:NEXT_B)}::{enu:underscored$foo(AnotherUnderscoredEnum:NEXT_B)}::{enu:uncommon(UncommonEnum:NEXT$B)}"),
+                            "templates/bar.html"));
 
     @Inject
     Template foo;
 
+    @Inject
+    Template bar;
+
     @Test
     public void testMessages() {
         assertEquals("On::Off::Undefined::1::0::U::+::-::_::on::off::undefined", foo.render());
         assertEquals("Zapnuto::Vypnuto::Nedefinováno::1::0::N::+::-::_::zap::vyp::nedef",
                 foo.instance().setLocale("cs").render());
+        assertEquals("A/B::Foo/Bar/Baz::NEXT::NEXT::NEXT", bar.render());
+    }
+
+    @TemplateEnum
+    public enum UnderscoredEnum {
+        A_B,
+        FOO_BAR_BAZ
+    }
+
+    @TemplateEnum
+    public enum AnotherUnderscoredEnum {
+        NEXT_B
+    }
+
+    @TemplateEnum
+    public enum UncommonEnum {
+        NEXT$B
     }
 
     @MessageBundle(value = "enu", locale = "en")
@@ -69,6 +93,22 @@ public interface Messages {
         @Message
         String locFileOverride(MyEnum myEnum);
 
+        // maps to underscored_$A_B, underscored_$FOO_BAR_BAZ
+        @Message
+        String underscored(UnderscoredEnum val);
+
+        // maps to underscored_foo_$NEXT_B
+        @Message
+        String underscored_foo(AnotherUnderscoredEnum val);
+
+        // maps to underscored$foo_$NEXT_B
+        @Message
+        String underscored$foo(AnotherUnderscoredEnum val);
+
+        // maps to uncommon_$NEXT$B
+        @Message
+        String uncommon(UncommonEnum val);
+
     }
 
 }

extensions/qute/deployment/src/test/java/io/quarkus/qute/deployment/i18n/MessageBundleInvalidEnumConstantTest.java

@@ -0,0 +1,43 @@
+package io.quarkus.qute.deployment.i18n;
+
+import static org.junit.jupiter.api.Assertions.fail;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.quarkus.qute.TemplateEnum;
+import io.quarkus.qute.deployment.MessageBundleException;
+import io.quarkus.qute.i18n.Message;
+import io.quarkus.qute.i18n.MessageBundle;
+import io.quarkus.test.QuarkusUnitTest;
+
+public class MessageBundleInvalidEnumConstantTest {
+
+    @RegisterExtension
+    static final QuarkusUnitTest config = new QuarkusUnitTest()
+            .withApplicationRoot(root -> root
+                    .addClasses(Messages.class, UnderscoredEnum.class)
+                    .addAsResource("messages/enu_invalid.properties"))
+            .setExpectedException(MessageBundleException.class, true);
+
+    @Test
+    public void testMessages() {
+        fail();
+    }
+
+    @TemplateEnum
+    public enum UnderscoredEnum {
+
+        A_B,
+
+    }
+
+    @MessageBundle(value = "enu_invalid")
+    public interface Messages {
+
+        @Message
+        String underscored(UnderscoredEnum constants);
+
+    }
+
+}

extensions/qute/deployment/src/test/resources/messages/enu.properties

@@ -10,4 +10,13 @@ locFileOverride={#when myEnum}\
         {#is ON}on\
         {#is OFF}off\
         {#else}undefined\
-       {/when}
+       {/when}
+
+underscored_$A_B=A/B
+underscored_$FOO_BAR_BAZ=Foo/Bar/Baz
+
+underscored_foo_$NEXT_B=NEXT
+
+underscored$foo_$NEXT_B=NEXT
+
+uncommon_$NEXT$B=NEXT

extensions/qute/deployment/src/test/resources/messages/enu_cs.properties

@@ -10,4 +10,13 @@ locFileOverride={#when myEnum}\
         {#is ON}zap\
         {#is OFF}vyp\
         {#else}nedef\
-       {/when}
+       {/when}
+
+underscored_$A_B=A/B
+underscored_$FOO_BAR_BAZ=Foo/Bar/Baz
+
+underscored_foo_$NEXT_B=NEXT
+
+underscored$foo_$NEXT_B=NEXT
+
+uncommon_$NEXT$B=NEXT

extensions/qute/deployment/src/test/resources/messages/enu_invalid.properties

@@ -0,0 +1,2 @@
+underscored_$A_B=A/B
+underscored_$FOO_BAR_BAZ=Foo/Bar/Baz

extensions/qute/runtime/src/main/java/io/quarkus/qute/i18n/Message.java

@@ -27,7 +27,7 @@
  * There is a convenient way to localize enums.
  * <p>
  * If there is a message bundle method that accepts a single parameter of an enum type and has no message template defined then
- * it receives a generated template:
+ * it receives a generated template like:
  *
  * <pre>
  * {#when enumParamName}
@@ -37,14 +37,20 @@
  * </pre>
  *
  * Furthermore, a special message method is generated for each enum constant. Finally, each localized file must contain keys and
- * values for all constant message keys:
+ * values for all enum constants.
  *
  * <pre>
  * methodName_CONSTANT1=Value 1
  * methodName_CONSTANT2=Value 2
  * </pre>
  *
- * In a template, an enum constant can be localized with a message bundle method {@code msg:methodName(enumConstant)}.
+ * By default, the message key consists of the method name followed by the {@code _} separator and the constant name. If any
+ * constant name of a particular enum contains the {@code _} or the {@code $} character then the {@code _$} separator must be
+ * used for all message keys for this enum instead. For example, {@code methodName_$CONSTANT_1=Value 1} or
+ * {@code methodName_$CONSTANT$1=Value 1}.
+ * </p>
+ * In a template, the localized message for an enum constant can be obtained with a message bundle method like
+ * {@code msg:methodName(enumConstant)}.
  *
  * @see MessageBundle
  */