清理不再使用的代码段——跳过带<pre>标签的注释, fixes #150

p3c-pmd/src/main/java/com/alibaba/p3c/pmd/lang/java/rule/comment/RemoveCommentedCodeRule.java

@@ -44,6 +44,8 @@ public class RemoveCommentedCodeRule extends AbstractAliCommentRule {
 
     private static final Pattern SUPPRESS_PATTERN = Pattern.compile("\\s*///.*", Pattern.DOTALL);
 
+    private static final Pattern PRE_TAG_PATTERN = Pattern.compile(".*<pre>.*", Pattern.DOTALL);
+
     private static final Pattern IMPORT_PATTERN = Pattern.compile(".*import\\s(static\\s)?(\\w*\\.)*\\w*;.*",
         Pattern.DOTALL);
 
@@ -125,6 +127,11 @@ public class RemoveCommentedCodeRule extends AbstractAliCommentRule {
     protected CommentPatternEnum scanCommentedCode(String content) {
         CommentPatternEnum pattern = CommentPatternEnum.NONE;
 
+        // Skip comment which contains pre tag.
+        if (PRE_TAG_PATTERN.matcher(content).matches()) {
+            return pattern;
+        }
+
         if (IMPORT_PATTERN.matcher(content).matches()) {
             pattern = CommentPatternEnum.IMPORT;
         } else if (FIELD_PATTERN.matcher(content).matches()) {

p3c-pmd/src/test/resources/com/alibaba/p3c/pmd/lang/java/rule/comment/xml/RemoveCommentedCodeRule.xml

@@ -103,4 +103,37 @@ public class Test {
         <code-ref id="example-in-javadoc" />
     </test-code>
 
+    <code-fragment id="code-without-pre-tag"><![CDATA[
+/**
+ * import net.sourceforge.pmd.lang.java.ast.ASTCompilationUnit;
+ */
+public class Test {
+}
+    ]]>
+    </code-fragment>
+
+    <test-code>
+        <description>Code without pre tag</description>
+        <expected-problems>1</expected-problems>
+        <expected-linenumbers>1</expected-linenumbers>
+        <code-ref id="code-without-pre-tag" />
+    </test-code>
+
+    <code-fragment id="code-in-pre-tag"><![CDATA[
+/**
+ * <pre>
+ * import net.sourceforge.pmd.lang.java.ast.ASTCompilationUnit;
+ * </pre>
+ */
+public class Test {
+}
+    ]]>
+    </code-fragment>
+
+    <test-code>
+        <description>Code in pre tag</description>
+        <expected-problems>0</expected-problems>
+        <code-ref id="code-in-pre-tag" />
+    </test-code>
+
 </test-data>
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