Adding support for additional query languages

narphorium commented 11 years ago

Each Quepy application can define its own query output language by including a printout.py file and an appropriately named expression_to_myquerylang function. When generating a query you can now pass a query_lang='myquerylang' parameter. The query language defaults to SPARQL if no query_lang is specified.

See freebase-quepy for an example of adding a new query language (MQL): https://github.com/narphorium/quepy-freebase

rafacarrascosa commented 11 years ago

Great! but I'll have to ask you a few small changes:

We're inaugurating a "develop" branch (and trying start follow git flow [0]), so could you make the pull request against "develop" instead?
In init, instead of receiving a printout module, what about receiving just a printout funcion? It would save all the sys and import stuff. The function prototype should be fixed to "takes an expression and returns (target, query)".
The target variable is important for sparql generation (I left a comment in the diff), so it should be preserved.

What do you think?

[0] http://nvie.com/posts/a-successful-git-branching-model/

narphorium commented 11 years ago

Sounds good. I'll make these changes and submit another pull request against develop when they're done.

machinalis / quepy

Adding support for additional query languages #5