json-parser-yaml-converter/src/yamlConverter.js

Enhanced JSON Parser with verbose error messages and JSON to YAML conversion

/**
 * This module contains the function jsonToYaml that converts a JSON file to a YAML file.
 *
 * @module yamlConverter
 */


'use strict';

import { jsonParse } from './index.js';
import { writeFileSync } from 'fs';

/**
 * Converts a JSON file to a YAML file.
 * @param {string} jsonFile JSON file to convert.
 * @param {string} yamlFile YAML file to output.
 * @returns {void}
 * @throws {Error} If the JSON file could not be converted to YAML.
 */
function jsonToYaml(jsonFile, yamlFile) {
  const JSON_AST = jsonParse(jsonFile, true);
  const YAML = astToYamlString(JSON_AST);
  writeFileSync(yamlFile, YAML);
}

/**
 * Converts a JSON AST to a YAML string.
 * @param {Object} ast AST to convert.
 * @param {number} indent Current indentation level.
 * @returns {string} The YAML string.
 */
function astToYamlString(ast, indent = 0) {
  let yamlString = '';
  if (ast.type === 'object') {
    yamlString += ast.properties.map((pair) => {
      return ' '.repeat(indent) + pair.key + ': ' + astToYamlString(pair.value, indent + 2);
    }).join('\n');
    return yamlString.length === 0 ? '{}' : indent === 0 ? yamlString : '\n' + yamlString;
  }
  if (ast.type === 'array') {
    yamlString += ast.elements.map((element) => {
      return ' '.repeat(indent) + '- ' + astToYamlString(element, indent + 2);
    }).join('\n');
    return yamlString.length === 0 ? '[]' : indent === 0 ? yamlString : '\n' + yamlString;
  }
  return String(ast.value);
}

export { jsonToYaml };