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POHow to match optional open/close tags in JavaCC?
 

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  1. POHow to match optional open/close tags in JavaCC?
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    <p><strong>What JavaCC syntax does implement grammar that can parse these kind of lines:</strong></p> <pre><code>[b]content[/b] content[/b] [b]content </code></pre> <p>Although the JavaCC parser needs to parse all lines, it <em>must distinguish correct and incorrect tagging</em> behavior.</p> <p><strong>Correct tags</strong> are like the 1st line, they have an open and close tag. When the tags are matched this will output a bold formated text.</p> <p><strong>Incorrect tags</strong> are like line's 2 and 3, they have no matching open or close tag. When these occure, they are written to the output as-is and will not be interpreted as tags.</p> <p>I have tried the JavaCC code below (LOOKAHEAD = 999999). Problem is, this syntax will <em>always match everything as invalidTag()</em> instead of <em>bold()</em>. How can I make sure that the JavaCC parser will match <em>bold()</em> when ever possible?</p> <pre><code>String parse() : {} { body() &lt;EOF&gt; { return buffer; } } void body() : {} { (content())* } void content() : {} { (text()|bold()|invalidTag) } void bold() : {} { { buffer += "&lt;b&gt;"; } &lt;BOLDSTART&gt;(content())*&lt;BOLDEND&gt; { buffer += "&lt;/b&gt;"; } } void invalidTag() : { } { &lt;BOLDSTART&gt; | &lt;BOLDEND&gt; { // todo: just output token } } TOKEN : { &lt;TEXT : (&lt;LETTER&gt;|&lt;DIGIT&gt;|&lt;PUNCT&gt;|&lt;OTHER&gt;)+ &gt; |&lt;BOLDSTART : "[b]" &gt; |&lt;BOLDEND : "[/b]" &gt; |&lt;LETTER : ["a"-"z","A"-"Z"] &gt; |&lt;DIGIT : ["0"-"9"] &gt; |&lt;PUNCT : [".", ":", ",", ";", "\t", "!", "?", " "] &gt; |&lt;OTHER : ["*", "'", "$", "|", "+", "(", ")", "{", "}", "/", "%", "_", "-", "\"", "#", "&lt;", "&gt;", "=", "&amp;", "\\"] &gt; } </code></pre>
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    1. CO* Sees BBCode *... * [Pukes ](http://stackoverflow.com/questions/3788959/regex-to-split-bbcode-into-pieces/3792262#3792262) *
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