[antlr-interest] What is the real value of ANTLR TreeParsing?
parrt at jguru.com
Thu Jul 25 16:22:43 PDT 2002
You may find this faq entry answers your question nicely :)
It's called "What is a tree parser and why would I want to use one?"
I would like to make ANTLR ASTs DOM compatible but I can't since DOM
used the same method names as I have but return DOM not AST so Java
bitches. I cannot fix this w/o breaking backward compatibility big time
with existing ANTLR translators :( Tell those DOM guys I was here
On Thursday, July 25, 2002, at 11:34 AM, micheal_jor wrote:
> Hi All,
> Can anyone please define what the real value of TreeParsers are?
> I am more familiar with the construction of a custom AST object
> hierarchy that supports the use of ConcreteVisitors (cf The Visitor
> Pattern) to implement phases such as type-checking, code-generateion
> Given that TreeParsers essentially mandate the use of ANTLR's own AST
> structure, I feel the need to be very clear about their utility. So
> far all I can see is:
> a. Since ANTLR AST is used, AST creation is easier and absorbed into
> grammar creation costs
> b. Supplied utilities (ParseView and ASTFrame) allows visualization
> of AST.
> c. For [relatively straightforward] source-to-source translation
> tasks, TreeParsers are probably the best choice given the reduction
> in code required and the "executable documentation" aspect of the *.g
> Since choosing to use TreeParsers also effectively precludes using
> custom ASTs and the Visitor pattern....are there any limitations to
> adopting ANTLR ASTs and TreeParsers?. The project of interest is a
> code transformer/analyzer for about three custom languages. It is
> written in Java currently (without ANTLR) but a switch to C++ is
> likely if I can find decent C++ ANTLR examples to build off.
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