@sequeljs/ast/dist/es/visitors/Visitor.js

A SQL AST manager for JavaScript

import Attribute from '../attributes/Attribute';
import VisitorError from '../errors/VisitorError';
export default class Visitor {
    accept(object, collector) {
        return this.visit(object, collector);
    }
    visit(object, collector) {
        let objectType;
        if (object === null) {
            objectType = 'Null';
        }
        else if (typeof object === 'bigint') {
            objectType = 'BigInt';
        }
        else if (typeof object === 'boolean') {
            objectType = 'Boolean';
        }
        else if (typeof object === 'number') {
            objectType = 'Number';
        }
        else if (typeof object === 'string') {
            objectType = 'String';
        }
        else if (typeof object === 'symbol') {
            objectType = 'Symbol';
        }
        else if (object instanceof Attribute) {
            objectType = `Attributes${object.constructor.name}`;
        }
        else {
            let prototype = object.constructor;
            objectType = prototype.name;
            while (!(`visit${objectType}` in this.constructor.prototype) &&
                objectType !== '') {
                prototype = Object.getPrototypeOf(prototype);
                objectType = prototype.name;
            }
        }
        if (objectType !== '' &&
            `visit${objectType}` in this.constructor.prototype) {
            const visitFunction = this.constructor.prototype[`visit${objectType}`].bind(this);
            return visitFunction(object, collector);
        }
        throw new VisitorError(`Cannot visit ${objectType}`);
    }
}
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