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POTree Rewrite - whole subtree not just the top node should become root
 

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    <p>I want that the tree rewrite of *addition_operator* contains the whole subtree not only the top node, so that *hint_keywords* are still in the tree.</p> <p><em>addition</em> is so complex because I want to add the T_LEFT and T_RIGHT in the tree.</p> <p>antlr 3.3</p> <p>grammar:</p> <pre><code>grammar Test; options { output = AST; } tokens { T_LEFT; T_RIGHT; T_MARKER; } @lexer::header { package com.spielwiese; } @header { package com.spielwiese; } NUM : '0' .. '9' ( '0' .. '9' )*; ASTERISK : '*'; PLUS : '+'; MINUS : '-'; WS : (' '|'\r'|'\t'|'\n') {skip();}; addition : (a=atom -&gt; $a) ( addition_operator b=atom -&gt; ^(addition_operator ^(T_LEFT $addition) ^(T_RIGHT $b) ) )+ ; atom : NUM | '(' addition ')' -&gt; addition ; addition_operator : PLUS hints? -&gt; ^(PLUS hints?) | MINUS hints? -&gt; ^(MINUS hints?) ; hints : '[' hint_keywords += hint_keyword (',' hint_keywords += hint_keyword)* ']' -&gt; $hint_keywords ; hint_keyword : 'FAST' | 'SLOW' | 'BIG' | 'THIN' ; </code></pre> <p>As far as I can see the reason is the implementation of RewriteRuleSubtreeStream#nextNode() which uses adaptor.dupNode(tree) and I want a adaptor.dupTree(tree). </p> <p>given input</p> <p>2 + [BIG] 3 - [FAST, THIN] 4</p> <p>is:</p> <pre><code> +---------+ | - | +---------+ | \ | \ T_LEFT T_RIGHT | | +---------+ | + | 4 +---------+ | \ T_LEFT T_RIGHT | | 2 3 </code></pre> <p>and should be</p> <pre><code> +---------+ | - | +---------+ / / | \ / / | \ FAST THIN T_LEFT T_RIGHT | | +---------+ | + | 4 +---------+ / | \ / T_LEFT T_RIGHT BIG | | 2 3 </code></pre>
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