[java] text block literals: feature highlighting (IDEA-215312)

GitOrigin-RevId: c821907a3b48fcbe19f6d9409b87ce1a4bc3dc50

java/java-analysis-impl/src/com/intellij/codeInsight/daemon/impl/analysis/HighlightUtil.java

@@ -3095,6 +3095,7 @@ public class HighlightUtil extends HighlightUtilBase {
     MODULES(LanguageLevel.JDK_1_9, "feature.modules"),
     ENHANCED_SWITCH(LanguageLevel.JDK_12_PREVIEW, "feature.enhanced.switch"),
     SWITCH_EXPRESSION(LanguageLevel.JDK_12_PREVIEW, "feature.switch.expressions"),
+    TEXT_BLOCKS(LanguageLevel.JDK_X, "feature.text.blocks"),
     RAW_LITERALS(LanguageLevel.JDK_X, "feature.raw.literals");
 
     private final LanguageLevel level;

java/java-analysis-impl/src/com/intellij/codeInsight/daemon/impl/analysis/HighlightVisitorImpl.java

@@ -37,6 +37,7 @@ import com.intellij.psi.infos.CandidateInfo;
 import com.intellij.psi.infos.MethodCandidateInfo;
 import com.intellij.psi.javadoc.PsiDocComment;
 import com.intellij.psi.javadoc.PsiDocTagValue;
+import com.intellij.psi.tree.IElementType;
 import com.intellij.psi.util.*;
 import com.intellij.util.ObjectUtils;
 import com.intellij.util.containers.MostlySingularMultiMap;
@@ -467,9 +468,13 @@ public class HighlightVisitorImpl extends JavaElementVisitor implements Highligh
   @Override
   public void visitJavaToken(PsiJavaToken token) {
     super.visitJavaToken(token);
-    if (!myHolder.hasErrorResults() && token.getTokenType() == JavaTokenType.RAW_STRING_LITERAL) {
-      myHolder.add(checkFeature(token, Feature.RAW_LITERALS));
+
+    if (!myHolder.hasErrorResults()) {
+      IElementType type = token.getTokenType();
+      if (type == JavaTokenType.TEXT_BLOCK_LITERAL) myHolder.add(checkFeature(token, Feature.TEXT_BLOCKS));
+      if (type == JavaTokenType.RAW_STRING_LITERAL) myHolder.add(checkFeature(token, Feature.RAW_LITERALS));
     }
+
     if (!myHolder.hasErrorResults() && token.getTokenType() == JavaTokenType.RBRACE && token.getParent() instanceof PsiCodeBlock) {
       PsiElement gParent = token.getParent().getParent();
       PsiCodeBlock codeBlock;

java/java-psi-impl/src/messages/JavaErrorMessages.properties

@@ -485,6 +485,7 @@ feature.intersections.in.casts=Intersection types in casts
 feature.static.interface.calls=Static interface method calls
 feature.try.with.resources.refs=Resource references
 feature.modules=Modules
+feature.text.blocks=Text block literals
 feature.raw.literals=Raw string literals
 feature.enhanced.switch=Enhanced 'switch' blocks
 feature.switch.expressions='switch' expressions

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting/UnsupportedFeatures.java

@@ -21,6 +21,6 @@ class UnsupportedFeatures {
     java.lang.annotation.ElementType t = null;
     switch (<error descr="Incompatible types. Found: 'java.lang.annotation.ElementType', required: 'byte, char, short or int'">t</error>) { }
 
-    String raw = <error descr="Raw string literals are not supported at language level '1.4'">`hi there`</error>;
+    String raw = <error descr="Text block literals are not supported at language level '1.4'">"""hi there"""</error>;
   }
 }