Code generation #34
Description
Some solutions have been proposed to reduce the string concatenation (#11, #12). I'd like to pitch another alternative: code generation from a dynamically generated AST using escodegen.
You could have something like this:
const Sum = (exprs) => exprs.reduce((prev, curr) => BinOp(prev, '+', curr));
const strideTimesX = (i) => BinOp(
Member(parse('this.stride'), Literal(i), true),
'*',
'x' + i
);
const getFactory = (d, type) => FunctionDecl(
className(d, type) + '_get', args,
Return(
Member(
parse('this.data'),
Sum( range(d).map(strideTimesX).concat(thisOffset) ),
true))));esprima or acorn can also be used to generate the AST for the static portions of the code:
// from view.pick
let vars = acorn.parse('var a = [], b = [], c = this.offset;').body[0].expression;
FunctionDecl('pick', range(n).map((i) => 'x' + i),
[ vars,
//...
Return(BinOp('a', '+', 'b')) ] // <-- not accurate, just an exampleThis would allow for runtime generation of the classes and retention of efficiency, but in a more controlled and maintainable way. It also reads somewhat intuitively (I've been playing around with escodegen, the above are working examples).
Let me know what you think. You can see updates in my fork patgrasso/ndarray (check out the escodegen branch).