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Home » Eclipse Projects » Dynamic Languages Toolkit (DLTK) » 'unparsing' the AST
'unparsing' the AST [message #501722] Thu, 03 December 2009 15:25 Go to next message
raph  is currently offline raph Friend
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?


Re: 'unparsing' the AST [message #501852 is a reply to message #501722] Fri, 04 December 2009 04:29 Go to previous message
Alex Panchenko is currently offline Alex PanchenkoFriend
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 mailing
list, probably PDT has something useful for your task.

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