732: Remove trailing whitespace

src/main/java/org/openrewrite/staticanalysis/RemoveTrailingWhitespace.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2025 the original author or authors.
+ * <p>
+ * Licensed 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
+ * <p>
+ * https://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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 org.openrewrite.staticanalysis;
+
+import org.openrewrite.ExecutionContext;
+import org.openrewrite.Recipe;
+import org.openrewrite.TreeVisitor;
+
+public class RemoveTrailingWhitespace extends Recipe {
+    @Override
+    public String getDisplayName() {
+        return "Remove trailing whitespace";
+    }
+
+    @Override
+    public String getDescription() {
+        return "Remove any extra trailing whitespace from the end of each line.";
+    }
+
+    @Override
+    public TreeVisitor<?, ExecutionContext> getVisitor() {
+        return new RemoveTrailingWhitespaceVisitor<>();
+    }
+}

src/main/java/org/openrewrite/staticanalysis/RemoveTrailingWhitespaceVisitor.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright 2025 the original author or authors.
+ * <p>
+ * Licensed 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
+ * <p>
+ * https://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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 org.openrewrite.staticanalysis;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import org.jspecify.annotations.Nullable;
+import org.openrewrite.SourceFile;
+import org.openrewrite.Tree;
+import org.openrewrite.binary.Binary;
+import org.openrewrite.quark.Quark;
+import org.openrewrite.remote.Remote;
+import org.openrewrite.text.PlainText;
+import org.openrewrite.text.PlainTextVisitor;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class RemoveTrailingWhitespaceVisitor<P> extends PlainTextVisitor<P> {
+
+    @Nullable
+    private final Tree stopAfter;
+
+    @JsonCreator
+    public RemoveTrailingWhitespaceVisitor(@Nullable Tree stopAfter) {
+        this.stopAfter = stopAfter;
+    }
+
+    public RemoveTrailingWhitespaceVisitor() {
+        this(null);
+    }
+
+    @Override
+    public boolean isAcceptable(SourceFile sourceFile, P p) {
+        return !(sourceFile instanceof Binary ||
+                sourceFile instanceof Quark ||
+                sourceFile instanceof Remote);
+    }
+
+    @Override
+    public PlainText visitText(PlainText text, P p) {
+        PlainText plainText = super.visitText(text, p);
+        StringBuilder buf = new StringBuilder();
+        stripTrailingWhitespace(plainText.getText(), buf);
+        return plainText.withText(buf.toString());
+    }
+
+    @Override
+    public PlainText.Snippet visitSnippet(PlainText.Snippet snippet, P p) {
+        PlainText.Snippet plainTextSnippet = super.visitSnippet(snippet, p);
+        StringBuilder buf = new StringBuilder();
+        stripTrailingWhitespace(plainTextSnippet.getText(), buf);
+        return plainTextSnippet.withText(buf.toString());
+    }
+
+    private static final Pattern newline = Pattern.compile("(\\r\\n|\\r|\\n)");
+
+    private void stripTrailingWhitespace(String str, StringBuilder buf) {
+        Matcher m = newline.matcher(str);
+        int startIndex = 0;
+        while (startIndex < str.length()) {
+            boolean matchFound = m.find(startIndex);
+            int endIndex = matchFound ? m.start() : str.length();
+            String substring = str.substring(startIndex, endIndex);
+            buf.append(substring.replaceFirst("\\s+$", ""));
+            if (matchFound) {
+                buf.append(str, m.start(), m.end());
+                startIndex = m.end();
+            } else {
+                startIndex = str.length();
+            }
+        }
+    }
+
+}

src/test/java/org/openrewrite/staticanalysis/RemoveTrailingWhitespaceTest.java

@@ -0,0 +1,132 @@
+/*
+ * Copyright 2025 the original author or authors.
+ * <p>
+ * Licensed 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
+ * <p>
+ * https://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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 org.openrewrite.staticanalysis;
+
+import org.junit.jupiter.api.Test;
+import org.openrewrite.DocumentExample;
+import org.openrewrite.test.RecipeSpec;
+import org.openrewrite.test.RewriteTest;
+import org.openrewrite.test.SourceSpec;
+
+import static org.openrewrite.test.SourceSpecs.text;
+
+class RemoveTrailingWhitespaceTest implements RewriteTest {
+
+    @Override
+    public void defaults(RecipeSpec spec) {
+        spec.recipe(new RemoveTrailingWhitespace());
+    }
+
+    @DocumentExample
+    @SuppressWarnings("TrailingWhitespacesInTextBlock")
+    @Test
+    void removeTrailingFirst() {
+        rewriteRun(
+          text(
+            """
+                Lorem ipsum dolor sit amet, consectetur adipiscing elit,\s\s
+                sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+              """,
+            """
+                Lorem ipsum dolor sit amet, consectetur adipiscing elit,
+                sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+              """,
+            SourceSpec::noTrim
+          )
+        );
+    }
+
+    @SuppressWarnings("TrailingWhitespacesInTextBlock")
+    @Test
+    void removeTrailingLast() {
+        rewriteRun(
+          text(
+            """
+                Lorem ipsum dolor sit amet, consectetur adipiscing elit,
+                sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.\s\s
+              """,
+            """
+                Lorem ipsum dolor sit amet, consectetur adipiscing elit,
+                sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+              """,
+            SourceSpec::noTrim
+          )
+        );
+    }
+
+    @SuppressWarnings("TrailingWhitespacesInTextBlock")
+    @Test
+    void removeTrailingAll() {
+        rewriteRun(
+          text(
+            """
+                Lorem ipsum dolor sit amet, consectetur adipiscing elit,\s\s
+                sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.\s\s
+              """,
+            """
+                Lorem ipsum dolor sit amet, consectetur adipiscing elit,
+                sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+              """,
+            SourceSpec::noTrim
+          )
+        );
+    }
+
+    @SuppressWarnings("TrailingWhitespacesInTextBlock")
+    @Test
+    void removeTrailingBetween() {
+        rewriteRun(
+          text(
+            """
+                \s\s
+                Lorem ipsum dolor sit amet, consectetur adipiscing elit,
+                \s\s
+                sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+                \s\s
+              """,
+            """
+
+                Lorem ipsum dolor sit amet, consectetur adipiscing elit,
+
+                sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+
+              """,
+            SourceSpec::noTrim
+          )
+        );
+    }
+
+
+    @SuppressWarnings("TrailingWhitespacesInTextBlock")
+    @Test
+    void removeTrailingConsecutive() {
+        rewriteRun(
+          text(
+            """
+                Lorem ipsum dolor sit amet, consectetur adipiscing elit,\s\s
+                \s\s
+                sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+              """,
+            """
+                Lorem ipsum dolor sit amet, consectetur adipiscing elit,
+
+                sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+              """,
+            SourceSpec::noTrim
+          )
+        );
+    }
+}