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index.ts
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index.ts
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import {
Element,
BooleanElement,
NumberElement,
StringElement,
ArrayElement,
ObjectElement,
MemberElement,
NullElement,
RefElement,
LinkElement,
} from 'minim';
import { visit } from './visitor';
import EphemeralArray from './ast/ephemeral-array';
import EphemeralObject from './ast/ephemeral-object';
import {
isElement,
isBooleanElement,
isNumberElement,
isStringElement,
isNullElement,
} from '../../../predicates';
/* eslint-disable class-methods-use-this */
class Visitor {
public readonly ObjectElement = {
enter: (element: ObjectElement): EphemeralObject => {
if (this.references.has(element)) {
return this.references.get(element).toReference();
}
const ephemeral = new EphemeralObject(element.content);
this.references.set(element, ephemeral);
return ephemeral;
},
};
public readonly EphemeralObject = {
leave: (ephemeral: EphemeralObject): object => {
return ephemeral.toObject();
},
};
public readonly MemberElement = {
enter: (element: MemberElement): [unknown, unknown] => {
return [element.key, element.value];
},
};
public readonly ArrayElement = {
enter: (element: ArrayElement): any => {
if (this.references.has(element)) {
return this.references.get(element).toReference();
}
const ephemeral = new EphemeralArray(element.content);
this.references.set(element, ephemeral);
return ephemeral;
},
};
public readonly EphemeralArray = {
leave: (ephemeral: EphemeralArray): unknown[] => {
return ephemeral.toArray();
},
};
protected references: WeakMap<Element, any> = new WeakMap();
public BooleanElement(element: BooleanElement): boolean {
return element.toValue();
}
public NumberElement(element: NumberElement): number {
return element.toValue();
}
public StringElement(element: StringElement): string {
return element.toValue();
}
public NullElement() {
return null;
}
public RefElement(element: RefElement, ...rest: unknown[]) {
const ancestors = rest[3] as (Element | EphemeralArray | EphemeralObject)[];
if (ancestors[ancestors.length - 1]?.type === 'EphemeralObject') {
return Symbol.for('delete-node');
}
return String(element.toValue());
}
public LinkElement(element: LinkElement): string {
if (isStringElement(element.href)) {
return element.href.toValue();
}
return '';
}
}
type ShortCutElementTypes = StringElement | NumberElement | BooleanElement | NullElement;
const serializer = <T extends Element | unknown>(element: T): any => {
if (!isElement(element)) return element;
// shortcut optimization for certain element types
if (
isStringElement(element) ||
isNumberElement(element) ||
isBooleanElement(element) ||
isNullElement(element)
) {
return (element as ShortCutElementTypes).toValue();
}
return visit(element as Exclude<T, unknown>, new Visitor());
};
export default serializer;