StackOverflow2013

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PO
primarykey
Id
6690007
data
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0
AnswerCount
0
ClosedDate
CommentCount
0
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CreationDate
2011-07-14T07:46:19.427
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0
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2011-07-14T08:11:20.353
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2011-07-14T08:11:20.353
LastEditorUserId
50476
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50476
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6689568
PostTypeId
2
Score
4
ViewCount
0
LastEditorDisplayName
text
Body
<p>As already mentioned by others, your expression has to end with a <code>EOF</code>, but a nested expression cannot end with an <code>EOF</code>, of course.</p> <p>Remove the <code>EOF</code> from <code>expression</code>, and create a proper "entry point" for your parser that ends with the <code>EOF</code>.</p> <h2>file: T.g</h2> <pre><code>grammar T; options { output=AST; } parse : expression EOF! ; expression : '('! ('&' | '||' | '!')^ (atom | expression)* ')'! ; atom : '('! ITEM '='^ ITEM ')'! ; ITEM : ALPHANUMERIC+ ; fragment ALPHANUMERIC : ('a'..'z' | 'A'..'Z' | '0'..'9') ; WHITESPACE : (' ' | '\t' | '\r' | '\n') { skip(); } ; </code></pre> <h2>file: Main.java</h2> <pre><code>import org.antlr.runtime.*; import org.antlr.runtime.tree.*; import org.antlr.stringtemplate.*; public class Main { public static void main(String[] args) throws Exception { String source = "(||(attr=hello2)(!(attr2=12)))"; TLexer lexer = new TLexer(new ANTLRStringStream(source)); TParser parser = new TParser(new CommonTokenStream(lexer)); CommonTree tree = (CommonTree)parser.parse().getTree(); DOTTreeGenerator gen = new DOTTreeGenerator(); StringTemplate st = gen.toDOT(tree); System.out.println(st); } } </code></pre> <p>To run the demo, do:</p> <h2>*nix/MacOS:</h2> <pre>java -cp antlr-3.3.jar org.antlr.Tool T.g javac -cp antlr-3.3.jar *.java java -cp .:antlr-3.3.jar Main</pre> <h2>Windows:</h2> <pre>java -cp antlr-3.3.jar org.antlr.Tool T.g javac -cp antlr-3.3.jar *.java java -cp .;antlr-3.3.jar Main</pre> <p>which produces the DOT code representing the following AST:</p> <p><img src="https://i.stack.imgur.com/Pl8hx.png" alt="enter image description here"></p> <p><em>image created using <a href="http://graphviz-dev.appspot.com/" rel="nofollow noreferrer">graphviz-dev.appspot.com</a></em></p>
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