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POANTLR: rule Tokens has non-LL(*) decision due to recursive rule invocations reachable from alts
 

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  1. POANTLR: rule Tokens has non-LL(*) decision due to recursive rule invocations reachable from alts
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    <p>I'm learning about parsing/lexing in a course about Computer Science. For that we are using ANTLR.</p> <p>I'm modifying an XML-language, so it's no longer ambigious, but when I make the changes to the grammer, ANTLR complains. </p> <p>I know this specific question has been asked before, but it didn't really help!</p> <p><a href="https://stackoverflow.com/questions/3249685/antlr-rule-tokens-has-non-ll-decision-due-to-recursive-rule-invocations-reac">ANTLR: rule Tokens has non-LL(*) decision due to recursive rule invocations reachable from alts 1,2</a></p> <p>I have taken a snapshot of the error when I'm running ANTLR from the commando-prompt. <img src="https://i.stack.imgur.com/cYD3s.png" alt="Snapshot of the error"></p> <p>Here is the XML-grammar:</p> <pre><code>grammar XML; options { language = Java; } @lexer::members { boolean inTag = true; } xml_file returns [TaggedElement value] : tagged_element EOF ; tagged_element : start_tag element_body end_tag ; element_body : element | element element_body ; element : data_element | tagged_element ; data_element : PCDATA ; start_tag : OPEN_START_TAG NAME CLOSE_TAG ; end_tag : OPEN_END_TAG NAME CLOSE_TAG ; OPEN_START_TAG : '&lt;' { inTag = true; }; OPEN_END_TAG : '&lt;/' { inTag = true; }; CLOSE_TAG : '&gt;' { inTag = false; }; NAME : {inTag}?=&gt; ('a'..'z'|'A'..'Z')('a'..'z'|'A'..'Z'|'0'..'9')* ; WS : {inTag}?=&gt; (' '|'\t'|'\r'|'\n')+ { $channel = HIDDEN; } ; PCDATA : {!inTag}?=&gt; (~'&lt;')+ { setText($text.trim()); if ($text.length() == 0) $channel = HIDDEN; } ; </code></pre> <p>The problem occurs in</p> <pre><code>element_body </code></pre> <p>which is where i "fixed" the grammer. So my question is -> Whats wring with this grammar, and how can I make it work? Any help is greatly appreciated!</p>
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