WEB-38470: highlight unicode property escapes if not supported in dialect (JS before ES6, non-unicode regexps)

GitOrigin-RevId: 1a92beb95a2e7b868ef57ab0e1e24bedc1bcb134

RegExpSupport/src/org/intellij/lang/regexp/RegExpLanguageHost.java

@@ -106,6 +106,10 @@ public interface RegExpLanguageHost {
     return EMPTY_COMPLETION_ITEMS_ARRAY; 
   }
 
+  default boolean supportsPropertySyntax(@NotNull PsiElement context) {
+    return true;
+  }
+
   enum Lookbehind {
     /** Lookbehind not supported. */
     NOT_SUPPORTED,

RegExpSupport/src/org/intellij/lang/regexp/RegExpLanguageHosts.java

@@ -94,6 +94,11 @@ public final class RegExpLanguageHosts extends ClassExtension<RegExpLanguageHost
     return host != null && host.supportsLiteralBackspace(regExpChar);
   }
 
+  public boolean supportsPropertySyntax(@NotNull PsiElement context) {
+    RegExpLanguageHost host = findRegExpHost(context);
+    return host != null && host.supportsPropertySyntax(context);
+  }
+
   public boolean supportsNamedGroupSyntax(@Nullable final RegExpGroup group) {
     final RegExpLanguageHost host = findRegExpHost(group);
     return host != null && host.supportsNamedGroupSyntax(group);

RegExpSupport/src/org/intellij/lang/regexp/ecmascript/EcmaScriptRegexpParserDefinition.java

@@ -24,6 +24,7 @@ public class EcmaScriptRegexpParserDefinition extends RegExpParserDefinition {
   private final EnumSet<RegExpCapability> CAPABILITIES = EnumSet.of(RegExpCapability.OCTAL_NO_LEADING_ZERO,
                                                                     RegExpCapability.DANGLING_METACHARACTERS,
                                                                     RegExpCapability.ALLOW_EMPTY_CHARACTER_CLASS,
+                                                                    RegExpCapability.PROPERTY_VALUES,
                                                                     RegExpCapability.MAX_OCTAL_377);
 
   @Override

RegExpSupport/src/org/intellij/lang/regexp/validation/RegExpAnnotator.java

@@ -219,6 +219,10 @@ public final class RegExpAnnotator extends RegExpElementVisitor implements Annot
     if (category == null) {
       return;
     }
+    if (!myLanguageHosts.supportsPropertySyntax(property)) {
+      myHolder.createErrorAnnotation(property, "Property escape sequences are not supported in this regex dialect"); 
+      return;
+    }
     String propertyName = category.getText();
     if(!myLanguageHosts.isValidCategory(category.getPsi(), propertyName)) {
       final Annotation a = myHolder.createErrorAnnotation(category, "Unknown character category");