[Python-Dev] AST branch is in? (original) (raw)
Guido van Rossum guido at python.org
Fri Oct 21 21:13:36 CEST 2005
- Previous message: [Python-Dev] AST branch is in?
- Next message: [Python-Dev] AST branch is in?
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
On 10/21/05, Neil Schemenauer <nas at arctrix.com> wrote:
Also, the concrete syntax tree (CST) generated by Python's parser is not a convenient data structure to deal with. Anyone who's used the 'parser' module probably experienced the pain:
>>> parser.ast2list(parser.suite('a = 1')) [257, [266, [267, [268, [269, [320, [298, [299, [300, [301, [303, [304, [305, [306, [307, [308, [309, [310, [311, [1, 'a']]]]]]]]]]]]]]], [22, '='], [320, [298, [299, [300, [301, [303, [304, [305, [306, [307, [308, [309, [310, [311, [2, '1']]]]]]]]]]]]]]]]], [4, '']]], [0, '']]
That's the fault of the 'parser' extension module though, and this affects tools using the parser module, not the bytecode compiler itself. The CST exposed to C programmers is slightly higher level. (But the new AST is higher level still, of course.)
BTW, Elemental is letting me open-source a reimplementation of pgen in Python. This also includes a nifty way to generate ASTs. This should become available within a few weeks.
-- --Guido van Rossum (home page: http://www.python.org/~guido/)
- Previous message: [Python-Dev] AST branch is in?
- Next message: [Python-Dev] AST branch is in?
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]