Custom-environment DSL vs. require()
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- Subject: Custom-environment DSL vs. require()
- From: Alexander Gladysh <agladysh@...>
- Date: 2010年12月12日 11:37:57 +0300
Hi, list!
I have some code, written in a Lua-based DSL, a lot of constructs like this:
foo:bar "title"
{
baz = "quo";
alpha:beta "gamma"
{
"delta";
};
}
This code is executed inside a custom global environment with
pre-defined global objects foo and alpha (one can say these objects
implement Builder pattern — things are a bit more complicated in my
case, but that doesn't matter for this question).
After the code is run, I inspect foo and alpha variables, and get the
built data from them.
Now I want to move this code to the Lua module — to make it reusable
via require().
Obviously, I can't just require() the file with DSL — the environment
would be wrong.
This means that I have to put my DSL into a function:
local dsl_chunk = function()
return foo:bar "title"
{
baz = "quo";
alpha:beta "gamma"
{
"delta";
};
}
end
return
{
dsl_chunk = dsl_chunk;
}
This works, but is less pretty. Also it affects the code that loads
the DSL: I have to handle require-friendly DSL files differently.
Perhaps there is some trick that I miss? I don't mind to add some
boilreplate code to the "library" portions of my DSL code. But I'd
like to keep that boilerplate to a bare minimum.
Alexander.