[antlr-interest] Token Stream vs. AST

[Andy Tripp]

Oliver Wong wrote:

>From: antlr-interest-bounces at antlr.org
>[mailto:antlr-interest-bounces at antlr.org] On Behalf Of Andy Tripp
>  
>
>>I'd say about half of my C-to-Java rules are reused in COBOL-to-Java.
>>    
>>
>
>	This surprises me a lot. Can you elaborate on this? Surely stuff
>like "strcpy(a,b) -> a = b"  couldn't be re-used. What *could* be
>reused?
>
>	- Oliver
>  
>
After most of the COBOL-specific rules/phases have fired, the code looks 
pretty Java-like.
Some of the common rules:
remove gotos
rename files, vars, methods,
simplifications of various if/else if constructs
adding exception handling
checking for cases where javac will complain about "loss of precision".
making things into cleasses, adding imports, etc.
restoring comments

You're right, though, looking at it closely now, I'd say only maybe 20% 
of the
C-to-Java rules are reused in COBOL-to-Java.

Andy