Hello
I have followed the ANTLR FAQ at
http://www.antlr.org/wiki/pages/viewpage.action?pageId=1760 ("How can I build
parse trees not ASTs?") to build a parse tree.
I am using Visual Studio 2008 on Windows 7 32-bit with the C# ANTLR target and
ANTLR version 3.1.3. Building AST trees works fine.
Now I have the problem that every parse tree ends with an '<epsilon>' at the
first 'fork node', i.e. the first node where the tree splits up. For example,
in the following parse tree (as seen in the ANTLRWorks debugger)
base
|
node1
|
node2
___|__________
| | |
n3 n4 n5
the ParseTreeBuilder builds the following tree:
<base>
|
<node1>
|
<node2>
|
<epsilon>
In AST trees, I don't have this '<epsilon>'.
I have this behavior regardless of whether I am using very simple grammars or
complex, well-tested grammars like the C# grammar from
http://antlrcsharp.codeplex.com. The problem is at the ParseTreeBuilder, since
AST trees work well. Also, ANTLRWorks has no problems building a parse tree
without those '<epsilon>'s.
What am I doing wrong? Thank you for any hints!
Jacob
--
GMX.ch - Schweizer FreeMail-Dienst mit über 800.000 Mitgliedern
E-Mail & mehr! Kostenlos: http://portal.gmx.net/de/go/chfreemail
--
You received this message because you are subscribed to the Google Groups
"il-antlr-interest" group.
To post to this group, send email to il-antlr-inter...@googlegroups.com.
To unsubscribe from this group, send email to
il-antlr-interest+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/il-antlr-interest?hl=en.
