@anchan828/json-ast/dist/esm/visitor.js

JSON parser AST utilities

import { JsonNodeTypes, } from "./ast.js";
// Do not export this function as it provides the main traversal of the AST
function traverseAST(visitor, node) {
    switch (node.type) {
        case JsonNodeTypes.DOCUMENT: {
            visitor.document(node);
            if (node.comments) {
                node.comments.forEach((commentNode) => {
                    visitor.comment(commentNode);
                });
            }
            if (node.child) {
                node.child.accept(visitor);
            }
            break;
        }
        case JsonNodeTypes.OBJECT: {
            visitor.object(node);
            if (node.comments) {
                node.comments.forEach((commentNode) => {
                    visitor.comment(commentNode);
                });
            }
            if (node.properties) {
                node.properties.forEach((propNode) => {
                    propNode.accept(visitor);
                });
            }
            break;
        }
        case JsonNodeTypes.PROPERTY: {
            visitor.property(node);
            node.key.accept(visitor);
            node.value.accept(visitor);
            break;
        }
        case JsonNodeTypes.KEY: {
            visitor.key(node);
            break;
        }
        case JsonNodeTypes.ARRAY: {
            visitor.array(node);
            if (visitor.stop)
                break;
            if (node.comments) {
                node.comments.forEach((commentNode) => {
                    visitor.comment(commentNode);
                });
            }
            if (node.items) {
                node.items.forEach((itemNode) => {
                    itemNode.accept(visitor);
                });
            }
            break;
        }
        case JsonNodeTypes.STRING: {
            visitor.value(node);
            if (!visitor.stop)
                visitor.string(node);
            break;
        }
        case JsonNodeTypes.NUMBER: {
            visitor.value(node);
            if (!visitor.stop)
                visitor.number(node);
            break;
        }
        case JsonNodeTypes.TRUE: {
            visitor.value(node);
            if (!visitor.stop)
                visitor.boolean(node);
            break;
        }
        case JsonNodeTypes.FALSE: {
            visitor.value(node);
            if (!visitor.stop)
                visitor.boolean(node);
            break;
        }
        case JsonNodeTypes.NULL: {
            visitor.value(node);
            if (!visitor.stop)
                visitor.null(node);
            break;
        }
        default:
            break;
    }
}
export class Visitor {
    constructor() {
        this.stop = false;
    }
    // Visit
    visit(node) {
        // call to "private" function
        if (this.stop)
            return;
        traverseAST(this, node);
    }
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    document(docNode) { }
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    object(objectNode) { }
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    property(propertyNode) { }
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    key(keyNode) { }
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    array(arrayNode) { }
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    value(valueNode) { }
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    comment(commentNode) { }
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    string(stringNode) { }
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    number(numberNode) { }
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    boolean(booleanNode) { }
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    null(nullNode) { }
}