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View Code? Open in Web Editor NEWS-expression parser for Python
Home Page: http://james-sanders.com
S-expression parser for Python
Home Page: http://james-sanders.com
Usually, an s-expression is defined recursively as either an atom or a cons cell, with the cons cell consisting of a pair of symbolic expressions. Lists are defined as nested cons cells ending with a NIL/empty list atom. Cons cells are usually presented using dot notation: (1 . 2)
.
In Common Lisp:
* (equal '(1 . (2 . nil)) '(1 2))
T
In Hy:
=> (= '(1 . (2 . ())) '(1 2))
True
sexpr doesn't understand it, and treats dot as a floating point atom:
In [6]: parse('(1 . (2 . ())') == parse('(1 2)')
Out[6]: False
In [7]: parse('(1 . (2 . ())')
Out[7]: [SExpr([Atom int('1'), Atom float('.'), SExpr([Atom int('2'), Atom float('.'), SExpr([])])])]
While using dot notation for normal list is fairly obscure given the convenient syntactic sugar of (1 2)
, it's pretty useful for the alist data structure: ((key1 . value1) (key2 . value2))
.
Dear James,
could you please add a license to sexpr
?
Best,
Arne
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