Fix potential NPE #296

src/main/java/com/github/cameltooling/lsp/internal/parser/CamelKYamlDSLParser.java

@@ -96,10 +96,13 @@ private String getStringEncloser(String line) {
 		return null;
 	}
 
-	private String repairLostEscapeChars(String stringEncloser, String line) {
-		if (stringEncloser == null || line == null) {
+	String repairLostEscapeChars(String stringEncloser, String line) {
+		if (stringEncloser == null) {
 			return line;
 		}
+		if(line == null) {
+			return "";
+		}
 		String[] parts = line.split(stringEncloser);
 		StringBuilder res = new StringBuilder();
 		for (int i = 0; i < parts.length; i++) {

src/test/java/com/github/cameltooling/lsp/internal/parser/CamelKYamlDSLParserTest.java

@@ -0,0 +1,51 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.github.cameltooling.lsp.internal.parser;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+public class CamelKYamlDSLParserTest {
+
+	@Test
+	void testRepairEscapeCharacterWithNullLine() throws Exception {
+		assertThat(new CamelKYamlDSLParser().repairLostEscapeChars("\"", null)).isEmpty();
+	}
+
+	@Test
+	void testRepairEscapeCharacterWithNoStringEncloser() throws Exception {
+		assertThat(new CamelKYamlDSLParser().repairLostEscapeChars(null, "myLine")).isEqualTo("myLine");
+	}
+
+	@Test
+	void testRepairEscapeCharacterWithQuote() throws Exception {
+		assertThat(new CamelKYamlDSLParser().repairLostEscapeChars("'", "a value with ' quote inside")).isEqualTo("a value with '' quote inside");
+	}
+
+	@Test
+	void testRepairEscapeCharacterWithDoubleQuote() throws Exception {
+		assertThat(new CamelKYamlDSLParser().repairLostEscapeChars("\"", "a value with double-quote \" inside")).isEqualTo("a value with double-quote \\\" inside");
+	}
+
+	@Test
+	@Disabled("see https://github.com/camel-tooling/camel-language-server/issues/301")
+	void testRepairEscapeCharacterWithDoubleQuoteAndSlash() throws Exception {
+		assertThat(new CamelKYamlDSLParser().repairLostEscapeChars("\"", "a value with backslash \\ inside")).isEqualTo("a value with double-quote \\\\ inside");
+	}
+}