Definition: [
"autonomous agent",
{
"init": "{
// get info from state or input data
$list_name = trigger.data.list_name;
$list_owner = var[$list_name||"_owner"] otherwise trigger.address;
$list_items_count = var[$list_name||"_items_count"] otherwise 0;
// access checking
if (trigger.address != $list_owner)
bounce ("You don't own this private list!");
}",
"messages": {
"cases": [
{
"if": "{ !!trigger.data.add }",
"init": "{
// get the item and its key used for state var
$item = trigger.data.add;
$item_key = $list_name||"_"||$item;
}",
"messages": [
{
"app": "state",
"state": "{
// update list properties
var[$list_name||"_owner"] = $list_owner;
var[$list_name||"_items_count"] = $list_items_count + 1;
// update previously last item
$last_item = var[$list_name||"_last_item"];
$last_item_key = $list_name||"_"||$last_item;
if (!!$last_item) var[$last_item_key||"_next_item"] = $item;
// if this is the first item we have to set the first_item state var
if (var[$list_name||"_items_count"] == 1 ) var[$list_name||"_first_item"] = $item;
// add new item at the end of the linked list
var[$list_name||"_last_item"] = $item;
var[$item_key] = trigger.data.value otherwise true;
var[$item_key||"_previous_item"] = $last_item;
var[$item_key||"_next_item"] = false;
}"
}
]
},
{
"if": "{ !!trigger.data.remove }",
"init": "{
// get the item and its key used for state var
$item = trigger.data.remove;
$item_key = $list_name||"_"||$item;
// check that the list exist
if (!(var[$list_name||"_owner"]))
bounce ("'"||$list_name||"' did not exist !");
// check if item exist
if (!(var[$item_key]))
bounce ($item||" did not exist !");
// get the previous items
$previous_item = var[$item_key||"_previous_item"];
$previous_item_key = $list_name||"_"||$previous_item;
// get the next items
$next_item = var[$item_key||"_next_item"];
$next_item_key = $list_name||"_"||$next_item;
}",
"messages": [
{
"app": "state",
"state": "{
// update list state
var[$list_name||"_items_count"] = $list_items_count - 1;
// update link in previous item
var[$previous_item_key||"_next_item"] = $next_item;
// update link in next item
var[$next_item_key||"_previous_item"] = $previous_item;
// remove item
var[$item_key] = false;
var[$item_key||"_previous_item"] = false;
var[$item_key||"_next_item"] = false;
}"
}
]
},
{
"if": "{ trigger.data.delete }",
"init": "{
// check that the list is empty so that we can delete it without leaving anything in AA state var
if (var[$list_name||"_items_count"] > 0)
bounce ("List must be empty to be deleted, use 'remove_last_item' as much as needed");
}",
"messages": [
{
"app": "state",
"state": "{
var[$list_name||"_owner"] = false;
var[$list_name||"_items_count"] = false;
}"
}
]
},
{
"if": "{ !!trigger.data.get_previous }",
"init": "{
// check that the list exist
if (!(var[$list_name||"_owner"]))
bounce ("'"||$list_name||"' did not exist !");
// get previous item from specify one or very last one.
$previous_from_item = trigger.data.get_previous;
$previous_from_item_key = $list_name||"_"||$previous_from_item;
// if the specify item from which starting exist
$previous_item = !!var[$previous_from_item_key] ?
// return the next item of the list
var[$previous_from_item_key||"_previous_item"] otherwise bounce ("Was first item!") :
// or start from the last item of the list
var[$list_name||"_last_item"];
}",
"messages": [
{
"app": "data",
"payload": {
"item_name": "{ $previous_item }",
"item_value": "{ var[$list_name||$previous_item] }",
"token": "{ trigger.data.token }"
}
},
{
"app": "payment",
"payload": {
"outputs": [
{
"address": "{ trigger.address }",
"amount": "{4}"
}
]
}
}
]
},
{
"messages": [
{
"app": "state",
"state": "{
bounce ($INSTRUCTIONS||$inputs);
}"
}
]
}
]
}
}
]