On Sun, May 3, 2009 at 10:59, Ondrej Certik <[email protected]> wrote:
> Google app engine supports eval(), so we may just write a simple
> preparser based on the "re" module (also available on the app engine),
> that converts things like 1/2 to Integer(1)/Integer(2) and "x" to
> Symbol("x") and we should be fine. I don't know if eval() can handle
> large expressions (to fix #976), that would have to be tried. Usually
> a large expression is one big Add instance, so one solution that just
> occured to me is to split it into several smaller Add instances,
> evaluate each using eval() and add them together.
It's feasible to write and maintain a pyparsing parser for Python's
expression subgrammar. This also opens up the possibility for easily
extending the grammar to add other operators and such.
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
-- Umberto Eco
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