[antlr-interest] lexer: compound keywords with a twist
Edwards, Waverly
Waverly.Edwards at genesys.com
Sun Aug 19 19:28:49 PDT 2007
stringVar = Edit$( vNumParam )
Sorry, vNumParam is actually a variable number of parameters ( up to 5
).
W.
________________________________
From: antlr-interest-bounces at antlr.org
[mailto:antlr-interest-bounces at antlr.org] On Behalf Of Edwards, Waverly
Sent: Sunday, August 19, 2007 8:52 PM
To: antlr
Subject: [antlr-interest] lexer: compound keywords with a twist
Hello,
I'm a first time ANTLR user and I have some questions that I need some
assistanc with.
I am replicating an existing procedural BASIC dialect language compiler.
I actually have
multiple issues to overcome but this is the first one. The language has
*hundreds* of keywords.
Many of the keywords are actually compound keywords
Edit = numericVar
Edit Field
Edit Field Close
Edit Menu
Edit Text
Compile Long If
1. How would you define compound keywords? The keyword "Edit" has 5
different starts
and the longest usage is a combination of three words
2. Is it possible to deal with variable length keywords at the lexer
level.
stringVar = Edit$( vNumParam )
Edit$( vNumParam ) = stringVar
I have two instances where Edit$ ( different from Edit ) can be used.
One as a function
and the other a procedure. If Edit$ is on the left side of a variable
it's a procedure and
if on the right it's a function. The perform different tasks. Is there
a way at the lexer
level that I can pass the parser something like EditStatement vs
EditFunction depending
on what the lexer sees first.
Thank you,
W.
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