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'unparsing' the AST [message #501722]

Thu, 03 December 2009 15:25

raph

Messages: 2
Registered: December 2009

Junior Member

Hello everyone,

I'm fairly new to DLTK so please forgive me if this is a noobish question.
I'm using PDT [1] to parse PHP code and access a program's AST. Maybe I
can't see the forest for the trees, but how do I 'unparse' an AST back
into source code? Ideally, I wish to stay as close as possible to the
original code. I know that an ASTNode has getStart() and getEnd()
methods that I could use to get a node's original 'value', but surely
there must be a better way. From what I've seen an ASTNode does not
contain a reference to the original token.

By the way, is there a JavaDoc documentation for the DLTK API?

regards
raph

[1] http://www.eclipse.org/pdt/

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Re: 'unparsing' the AST [message #501852 is a reply to message #501722]

Fri, 04 December 2009 04:29

Alex Panchenko

Messages: 342
Registered: July 2009

Senior Member

Hi Raphael,

Generally, printing AST back to source code requires a lot of additional
information like positions for every token. That's why JDT uses 2 AST
class hierarchies: AST used by compiler and DOM AST used by refactoring,
etc. At the moment DLTK doesn't provide common implementation of the DOM
AST, but this idea is regularly discussed.

I think you should ask this question in pdt-dev@eclipse.org mailing
list, probably PDT has something useful for your task.

Regards,
Alex

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