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insert.ts
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insert.ts
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import { predicates, type ShapeToType } from "@sealcode/ts-predicates";
import type Context from "../../../../context.js";
import { ArrayAction } from "./array-action.js";
const InsertInputShape = {
insert: predicates.shape({
index: predicates.maybe(
predicates.or(predicates.number, predicates.string)
),
value: predicates.maybe(predicates.any),
}),
};
const InsertParsedShape = {
insert: predicates.shape({
index: predicates.number,
value: predicates.any,
}),
};
export class Insert extends ArrayAction<
ShapeToType<typeof InsertInputShape>,
ShapeToType<typeof InsertParsedShape>
> {
InputShape = InsertInputShape;
async _validate<T>(
context: Context,
action: ShapeToType<typeof InsertInputShape>,
array: T[]
): Promise<{ valid: boolean; reason: string }> {
const validation_result = await this.element_validator(
context,
action.insert.value || {},
action.insert.index == undefined
? array.length
: parseInt(action.insert.index.toString())
);
if (!validation_result.valid) {
return {
valid: false,
reason: validation_result.reason,
};
}
return { valid: true, reason: "Insert action shape ok" };
}
async _parse<T>(
_context: Context,
input: ShapeToType<typeof InsertInputShape>,
array: T[],
emptyValue: T
): Promise<ShapeToType<typeof InsertParsedShape> | null> {
return {
insert: {
index: parseInt(
(input.insert.index || array.length).toString()
),
value: input.insert.value || emptyValue,
},
};
}
async run<T>(
_context: Context,
action: ShapeToType<typeof InsertParsedShape>,
array: T[],
emptyElement: T
) {
const n = parseInt(
(action.insert.index === undefined
? array.length
: action.insert.index
).toString()
);
array = [
...array.slice(0, n),
action.insert.value === undefined
? emptyElement
: action.insert.value,
...array.slice(n),
];
return array;
}
}

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