[ 
https://issues.apache.org/jira/browse/LUCENE-4362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13453393#comment-13453393
 ] 

Erick Erickson commented on LUCENE-4362:
----------------------------------------

There's also a section of comments that's tabbed in the generated file, it may 
very well be the same issue of introducing tabs in the comments...

...../trunk/lucene/queryparser/src/java/org/apache/lucene/queryparser/flexible/standard/parser/StandardSyntaxParser.java

{noformat}

// QueryNode Query(CharSequence field) :
// {
// List clauses = new ArrayList();
//   List modifiers = new ArrayList();
//   QueryNode q, firstQuery=null;
//   ModifierQueryNode.Modifier mods;
//   int conj;
// }
// {
//   mods=Modifiers() q=Clause(field)
//   {
//     if (mods == ModifierQueryNode.Modifier.MOD_NONE) firstQuery=q;
//     
//     // do not create modifier nodes with MOD_NONE
//      if (mods != ModifierQueryNode.Modifier.MOD_NONE) {
//              q = new ModifierQueryNode(q, mods);
//      }
//      clauses.add(q);
//   }
//   (
//     conj=Conjunction() mods=Modifiers() q=Clause(field)
//     { 
//          // do not create modifier nodes with MOD_NONE
//              if (mods != ModifierQueryNode.Modifier.MOD_NONE) {
//                      q = new ModifierQueryNode(q, mods);
//              }
//              clauses.add(q);
//              //TODO: figure out what to do with AND and ORs
//   }
//   )*
//     {
//      if (clauses.size() == 1 && firstQuery != null)
//         return firstQuery;
//       else {
//              return new BooleanQueryNode(clauses);
//       }
//     }
// }
{noformat}
                
> ban tab-indented source
> -----------------------
>
>                 Key: LUCENE-4362
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4362
>             Project: Lucene - Core
>          Issue Type: Task
>            Reporter: Robert Muir
>            Assignee: Erick Erickson
>         Attachments: LUCENE-4326_trunk.patch, LUCENE-4362_4x.patch, 
> LUCENE-4362_4x.patch, LUCENE-4362_core.patch, LUCENE-4362.patch, 
> LUCENE-4362.patch
>
>
> This makes code really difficult to read and work with.
> Its easy enough to prevent.
> {noformat}
> Index: build.xml
> ===================================================================
> --- build.xml (revision 1380979)
> +++ build.xml (working copy)
> @@ -77,11 +77,12 @@
>          <or>
>            <containsregexp expression="@author\b" casesensitive="yes"/>
>            <containsregexp expression="\bno(n|)commit\b" casesensitive="no"/>
> +          <containsregexp expression="\t" casesensitive="no"/>
>          </or>
>        </fileset>
>        <map from="${validate.currDir}${file.separator}" to="* "/>
>      </pathconvert>
> -    <fail if="validate.patternsFound">The following files contain @author 
> tags or nocommits:${line.separator}${validate.patternsFound}</fail>
> +    <fail if="validate.patternsFound">The following files contain @author 
> tags, tabs or nocommits:${line.separator}${validate.patternsFound}</fail>
>    </target>
> {noformat}

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