json-joy/esm/json-text/toTree.js

Collection of libraries for building collaborative editing apps.

import { printTree } from 'tree-dump/lib/printTree';
import { stringify } from './stringify';
const isPrimitive = (value) => typeof value !== 'object' || value === null;
const isOneLineValue = (value) => {
    if (isPrimitive(value))
        return true;
    if (value instanceof Array && !value.length)
        return true;
    if (value && typeof value === 'object' && !Object.keys(value).length)
        return true;
    return false;
};
const isSimpleString = (str) => /^[a-z0-9]+$/i.test(str);
export const toTree = (value, tab = '') => {
    if (value instanceof Array) {
        if (value.length === 0)
            return '[]';
        return printTree(tab, value.map((v, i) => (tab) => {
            return `[${i}]${isOneLineValue(v) ? ': ' : ''}${toTree(v, tab + ' ')}`;
        })).slice(tab ? 0 : 1);
    }
    else if (value && typeof value === 'object') {
        const keys = Object.keys(value);
        if (keys.length === 0)
            return '{}';
        return printTree(tab, keys.map((k) => (tab) => {
            const addQuotes = !isSimpleString(k);
            const formattedKey = addQuotes ? JSON.stringify(k) : k;
            const val = value[k];
            return `${formattedKey}${isOneLineValue(val) ? ' = ' : ''}${toTree(val, tab)}`;
        })).slice(tab ? 0 : 1);
    }
    return stringify(value);
};