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POAntrl3 conditional tree rewrites
 

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    <p>Stackoverflow.</p> <p>Continuing on my journey into Antlr (Previous questions may provide additional clues on what I'm trying to achieve! <a href="https://stackoverflow.com/questions/2061166/how-do-i-make-a-treeparser-in-antrl3/2061277#2061277">Q1 - How do I make a tree parser</a> and <a href="https://stackoverflow.com/questions/2113703/antlr-left-recursive-problem/2117334#2117334">Q2 - Solving LL recursion problem</a>) I've hit yet another roadblock I cannot flathom.</p> <p>Basically (I believe) the <code>expression</code> rule in my grammar needs to either create a new root node depending on the number of <code>datatype</code>s it has matched. I have put together an example to try best describe what I mean:</p> <p>Given the following input:</p> <pre><code>ComplexFunction(id="Test" args:[1, 25 + 9 + 8, true, [1,2,3]]) </code></pre> <p>I get this tree:</p> <blockquote> <p><a href="http://img25.imageshack.us/img25/2273/treeka.png" rel="nofollow noreferrer">http://img25.imageshack.us/img25/2273/treeka.png</a></p> </blockquote> <p>For reference - The first element in the "args" array as been correctly parsed. Whereas the 2nd element in the array "args" '25 + 9 + 8' has not. It appears to only match the last 2 parts of the expression (9 + 8). </p> <p>I'm trying to get the 2nd element of the array to be an <code>EXPRESSION</code> node, with the 3 children 25, 9, and 8).</p> <p>I'm honestly stuck and need your help (Again). Thanks for your time :)</p> <p>For reference, here is my grammar:</p> <pre><code>grammar Test; options {output=AST;ASTLabelType=CommonTree;} tokens {FUNCTION; NAME; ATTRIBUTES; ATTRIBUTE; VALUE; CHILDREN; EXPRESSION;} program : function ; function : ID (OPEN_BRACKET (attribute (COMMA? attribute)*)? CLOSE_BRACKET)? (OPEN_BRACE function* CLOSE_BRACE)? SEMICOLON? -&gt; ^(FUNCTION ^(NAME ID) ^(ATTRIBUTES attribute*) ^(CHILDREN function*)) ; attribute : ID (COLON | EQUALS) expression -&gt; ^(ATTRIBUTE ^(NAME ID) ^(VALUE expression)); expression : datatype (PLUS datatype)* -&gt; datatype ^(EXPRESSION datatype+)?; datatype : ID -&gt; ^(STRING["ID"] ID) | NUMBER -&gt; ^(STRING["NUMBER"] NUMBER) | STRING -&gt; ^(STRING["STRING"] STRING) | BOOLEAN -&gt; ^(STRING["BOOLEAN"] BOOLEAN) | array -&gt; ^(STRING["ARRAY"] array) | lookup -&gt; ^(STRING["LOOKUP"] lookup) ; array : OPEN_BOX (expression (COMMA expression)*)? CLOSE_BOX -&gt; expression* ; lookup : OPEN_BRACE (ID (PERIOD ID)*) CLOSE_BRACE -&gt; ID* ; NUMBER : ('+' | '-')? (INTEGER | FLOAT) ; STRING : '"' ( ESC_SEQ | ~('\\'|'"') )* '"' ; BOOLEAN : 'true' | 'TRUE' | 'false' | 'FALSE' ; ID : (LETTER|'_') (LETTER | INTEGER |'_')* ; COMMENT : '//' ~('\n'|'\r')* '\r'? '\n' {$channel=HIDDEN;} | '/*' ( options {greedy=false;} : . )* '*/' {$channel=HIDDEN;} ; WHITESPACE : (' ' | '\t' | '\r' | '\n') {$channel=HIDDEN;} ; COLON : ':' ; SEMICOLON : ';' ; COMMA : ',' ; PERIOD : '.' ; PLUS : '+' ; EQUALS : '=' ; OPEN_BRACKET : '(' ; CLOSE_BRACKET : ')' ; OPEN_BRACE : '{' ; CLOSE_BRACE : '}' ; OPEN_BOX : '[' ; CLOSE_BOX : ']' ; fragment LETTER : 'a'..'z' | 'A'..'Z' ; fragment INTEGER : '0'..'9'+ ; fragment FLOAT : INTEGER+ '.' INTEGER* ; fragment ESC_SEQ : '\\' ('b'|'t'|'n'|'f'|'r'|'\"'|'\''|'\\') ; </code></pre>
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