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import { callFn, emptyStackFrame, evaluate, lex, parse } from "../js-lang";
import {
Evaluate,
FnPrim,
Lex,
Parse,
EvalError,
CallFn,
EmptyStackFrame,
ASTNode,
} from "../ts-lang";
export type TransformArgs<Args extends readonly ASTNode[]> = {
[Idx in keyof Args]: any;
};
export type AssertArgs<
Args extends readonly ASTNode[],
ArgsConstraint extends readonly any[]
> = TransformArgs<Args> extends ArgsConstraint ? ArgsConstraint : never;
export const createFn =
<ArgsConstraint extends any[]>() =>
<Program extends string>(
program: Program
): Evaluate<Parse<Lex<Program>>> extends [infer ProgramFn extends FnPrim]
? TransformArgs<ProgramFn["args"]> extends ArgsConstraint
? <const Args extends ArgsConstraint>(
...args: Args
) => CallFn<ProgramFn, Args, EmptyStackFrame>
: EvalError<`Program's args do not extend args constraint`>
: EvalError<"Cannot create a function from a program that does not eval to a function"> => {
const [programFn] = evaluate(parse(lex(program))) as Array<FnPrim>;
if (!programFn.fn) {
throw new Error(
"Cannot create a function from a program that does not eval to a function"
);
}
return ((...args: any[]) =>
callFn(programFn, args, emptyStackFrame)) as any;
};
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