[antlr-interest] Problem with '.' character

[Jim Idle]

However, don’t use any kind of backtracking solution unless the parser
is quick and dirty.

 

Jim

 

From: Bertalan Fodor (LilyPondTool) [mailto:lilypondtool at organum.hu] 
Sent: Wednesday, January 23, 2008 8:03 AM
To: Daniels, Troy \(US SSA\)
Cc: antlr-interest at antlr.org
Subject: Re: [antlr-interest] Problem with '.' character

 

Isn't it possible to write this:

var1=var2.var3=myTable.myField

With ANTLR 3, in this case I think LL(*) with backtracking should find
its way, because the '=' sign will guide it. 

Bert



Daniels, Troy (US SSA) wrote: 

Why is var2.var3 not a field expression?  Is it because they are on
different lines?  If so, you need to exclude newlines from your ignored
whitespace, and write the line-based rules as something like:

 

assignment: expr EQ expr NL;

 

rather than what I assume your current rule is:

 

assignment: expr EQ expr;

 

where NL matches whatever is allowed for newlines. 

 

 

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