[java] text blocks: basic highlighting (IDEA-215312)

GitOrigin-RevId: 66780cacc839496911748c788ef8ca79a6cd0c9d

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

@@ -1144,6 +1144,19 @@ public class HighlightUtil extends HighlightUtilBase {
         }
       }
     }
+    else if (type == JavaTokenType.TEXT_BLOCK_LITERAL) {
+      if (value == null) {
+        if (text.charAt(3) != '\n') {
+          String message = JavaErrorMessages.message("text.block.new.line");
+          return HighlightInfo.newHighlightInfo(HighlightInfoType.ERROR).range(expression).descriptionAndTooltip(message).create();
+        }
+        if (!text.endsWith("\"\"\"")) {
+          String message = JavaErrorMessages.message("text.block.unclosed");
+          int p = expression.getTextRange().getEndOffset();
+          return HighlightInfo.newHighlightInfo(HighlightInfoType.ERROR).range(p, p).endOfLine().descriptionAndTooltip(message).create();
+        }
+      }
+    }
 
     if (value instanceof Float) {
       Float number = (Float)value;

java/java-psi-impl/src/com/intellij/psi/impl/source/tree/ElementType.java

@@ -64,5 +64,5 @@ public interface ElementType extends JavaTokenType, JavaDocTokenType, JavaElemen
 
   TokenSet INTEGER_LITERALS = TokenSet.create(INTEGER_LITERAL, LONG_LITERAL);
   TokenSet REAL_LITERALS = TokenSet.create(FLOAT_LITERAL, DOUBLE_LITERAL);
-  TokenSet STRING_LITERALS = TokenSet.create(STRING_LITERAL, RAW_STRING_LITERAL);
+  TokenSet STRING_LITERALS = TokenSet.create(STRING_LITERAL, TEXT_BLOCK_LITERAL, RAW_STRING_LITERAL);
 }

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

@@ -335,6 +335,8 @@ illegal.escape.character.in.string.literal=Illegal escape character in string li
 floating.point.number.too.large=Floating point number too large
 floating.point.number.too.small=Floating point number too small
 illegal.underscore=Illegal underscore
+text.block.new.line=Illegal text block start: missing new line after opening quotes
+text.block.unclosed=Unclosed text block
 
 import.statement.identifier.or.asterisk.expected.=Identifier or '*' expected
 

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting13/TextBlocks.java

@@ -0,0 +1,7 @@
+class C {
+  String empty = """
+      """;
+  String invalid1 = <error descr="Illegal text block start: missing new line after opening quotes">""""""</error>;
+  String invalid2 = <error descr="Illegal text block start: missing new line after opening quotes">""" """</error>;
+  String invalid3 = <error descr="Illegal text block start: missing new line after opening quotes">"""\\n """</error>;
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting13/UnclosedTextBlock.java

@@ -0,0 +1,4 @@
+class C {
+  String unclosed = """
+      \""";
+}<EOLError descr="Unclosed text block"></EOLError><EOLError descr="'}' expected"></EOLError><EOLError descr="';' expected"></EOLError>

java/java-tests/testSrc/com/intellij/java/codeInsight/daemon/LightJava13HighlightingTest.kt

@@ -0,0 +1,18 @@
+// Copyright 2000-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package com.intellij.java.codeInsight.daemon
+
+import com.intellij.JavaTestUtil
+import com.intellij.testFramework.fixtures.LightCodeInsightFixtureTestCase
+
+class LightJava13HighlightingTest : LightCodeInsightFixtureTestCase() {
+  override fun getProjectDescriptor() = JAVA_13
+  override fun getBasePath() = JavaTestUtil.getRelativeJavaTestDataPath() + "/codeInsight/daemonCodeAnalyzer/advHighlighting13"
+
+  fun testTextBlocks() = doTest()
+  fun testUnclosedTextBlock() = doTest()
+
+  private fun doTest() {
+    myFixture.configureByFile(getTestName(false) + ".java")
+    myFixture.checkHighlighting()
+  }
+}

java/testFramework/src/com/intellij/testFramework/fixtures/LightCodeInsightFixtureTestCase.java

@@ -71,6 +71,7 @@ public abstract class LightCodeInsightFixtureTestCase extends UsefulTestCase {
   public static final @NotNull LightProjectDescriptor JAVA_10_ANNOTATED = new ProjectDescriptor(LanguageLevel.JDK_10, true);
   public static final @NotNull LightProjectDescriptor JAVA_11 = new ProjectDescriptor(LanguageLevel.JDK_11);
   public static final @NotNull LightProjectDescriptor JAVA_12 = new ProjectDescriptor(LanguageLevel.JDK_12_PREVIEW);
+  public static final @NotNull LightProjectDescriptor JAVA_13 = new ProjectDescriptor(LanguageLevel.JDK_13_PREVIEW);
   public static final @NotNull LightProjectDescriptor JAVA_X = new ProjectDescriptor(LanguageLevel.JDK_X);
 
   public static final @NotNull LightProjectDescriptor JAVA_LATEST = new ProjectDescriptor(LanguageLevel.HIGHEST) {