Sean,
I did the same using pyparsing recently - I found pyparsing quite
pythonic and *very* easy to use. The definition of the grammar looks
something like this:
...
word = Word(wordstartchars, wordchars)
phrase = QuotedString('"''')
term = Optional(uoper) + (phrase | word)
...
group_or_term = group | term
terms = OneOrMore(Optional(oper) + group_or_term)
...
I can send you the full code if you want.
- Frank
Shannon -jj Behrens wrote:
> On 1/26/07, Sean Davis <[EMAIL PROTECTED]> wrote:
>
>> I would like to build a small app akin to a filemaker database, but
>> web-based, of course. One nice feature of filemaker is the ability to
>> search based on pretty much any field (or combination). I know how to do
>> the searches, but I would like to make a simple query language (things like
>> "2..3", ">3", "=3", "widge*", etc.). I have read a bit about tokenizers.
>> Does using a token system make sense, or is there a better or simpler way?
>> Of course, I have to validate these things and then create SQL from them, so
>> any hints from that point of view are also appreciated.
>>
>
> I did something very similar to this recently. I implemented search
> expressions like "food and (cheese or beer)" and translated the
> expressions into SQL. I made use of Yapps2. I've used PLY in the
> past. I liked both of them. I can send you code if you want.
>
> In the distant past, I wrote an article about writing a programming
> language in Python:
> http://www.ddj.com/184405580;jsessionid=NZM4QI22OXGR4QSNDLRSKHSCJUNN2JVN?_requestid=578822
>
> Happy Hacking!
> -jj
>
>
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