here_you_go.cairo

%lang starknet
from starkware.cairo.common.math import assert_nn
from starkware.cairo.common.cairo_builtins import HashBuiltin

struct Call {
    to: felt,
    selector: felt,
    data_offset: felt,
    data_len: felt,
}

@view
func iterate_over_calls{syscall_ptr: felt*, pedersen_ptr: HashBuiltin*, range_check_ptr}(
    calls_len, calls: Call*, calldata_len: felt, calldata: felt*
) -> () {
    if (calls_len == 0) {
        return ();
    }

    iterate_over_calls(calls_len - 1, calls, calldata_len, calldata);

    let last_call: Call = calls[calls_len - 1];
    handle_one_call(
        last_call.to, last_call.selector, last_call.data_len, calldata + last_call.data_offset
    );
    return ();
}

func handle_one_call{syscall_ptr: felt*, pedersen_ptr: HashBuiltin*, range_check_ptr}(
    to, selector, calldata_len, calldata: felt*
) -> () {
    %{
        print("here you can call", ids.to, ids.selector, "with data:")
        for i in range(ids.calldata_len):
            print(str(i) + ")", memory[ids.calldata+i])
    %}

    return ();
}