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type BUILTIN = (args: any[]) => any;
export const V_BUILTIN_Arr: BUILTIN = (args) => args;
// FIXME actually implement this properly
export const V_BUILTIN_ToString: BUILTIN = (args) =>
args.length === 1 ? JSON.stringify(args[0]) : JSON.stringify(args);
export const V_BUILTIN_Add: BUILTIN = (args) => {
if (args.every((arg) => ["string", "number"].includes(typeof arg))) {
return args.reduce(
(acc, cur) => acc + cur,
typeof args[0] === "string" ? "" : 0
);
}
throw new Error(`Cannot add operands ${JSON.stringify(args, undefined, 2)}`);
};
export const V_BUILTIN_Mul: BUILTIN = (args) => {
if (args.every((arg) => typeof arg === "number") && args.length === 2) {
return args.reduce((acc, cur) => acc * cur, 1);
}
throw new Error(
`Can only multiply [number, number], but got ${JSON.stringify(
args,
undefined,
2
)}`
);
};
export const V_BUILTIN_IfElse: BUILTIN = (args) => {
if (args.length !== 3) {
throw new Error(`Invalid args for "if": ${JSON.stringify(args)}`);
}
const [cond, trueVal, falseVal] = args;
if (typeof cond !== "boolean") {
throw new Error(`Condition value ${JSON.stringify(cond)} is not a boolean`);
}
return cond ? trueVal : falseVal;
};
export const nameToBUILTIN: Record<string, BUILTIN> = {
arr: V_BUILTIN_Arr,
tostring: V_BUILTIN_ToString,
add: V_BUILTIN_Add,
mul: V_BUILTIN_Mul,
"?": V_BUILTIN_IfElse,
};
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