refs/lib/utils/transform.js

Compile and merge YAML, JSON or INI config files together through file path references

'use strict';

const Promise = require('bluebird');
const path = require('path');

function transform(dataStr, key, filePath, process) {
  return new Promise((resolve, reject) => {
    let dataString = dataStr;
    if (!dataString) {
      reject(new Error('Empty file, nothing to process.'));
    }
    const refMatches = dataString.match(/{"\$ref":"((?!#).*?)"}/g);
    const baseDir = path.dirname(filePath);
    if (refMatches && refMatches.length > 0) {
      const refFileList = [];
      refMatches.forEach((matchKey) => {
        const refFile = matchKey.match(/{"\$ref":"(.*)"}/)[1];
        const refFilePath = path.resolve(`${baseDir}/${refFile}`);
        refFileList.push(process(refFilePath, matchKey));
      });
      return Promise.all(refFileList).then((results) => {
        const mergeMatches = dataString.match(/{"\$merge":\[(.*?)\]}/g);
        if (mergeMatches && mergeMatches.length > 0) {
          mergeMatches.forEach((mergeMatchKey) => {
            const localMatches = [];
            const localRefMatches = mergeMatchKey.match(/{"\$ref":"(.*?)"}/g);
            if (!localRefMatches || localRefMatches.length === 0) {
              reject(new Error('Malformed merge setting, please check the input file.'));
              return;
            }
            localRefMatches.forEach((refMatchKey) => {
              const j = results.length;
              for (let i = 0; i < j; i += 1) {
                const result = results[i];
                if (result.key === refMatchKey) {
                  const end = result.dataString.length - 2;
                  localMatches.push(result.dataString.substr(1, end));
                  break;
                }
              }
            });
            const localMatchesStr = `{${localMatches.join(',')}}`;
            dataString = dataString.replace(mergeMatchKey, localMatchesStr);
          });
        } else {
          results.forEach((result) => {
            dataString = dataString.replace(result.key, result.dataString);
          });
        }
        return resolve({
          dataString,
          key,
        });
      });
    }
    const mergeMatches = dataString.match(/{"\$merge":\[(.*?)\]}/g);
    if (mergeMatches && mergeMatches.length > 0) {
      return reject(new Error('Malformed merge setting, please check the input file.'));
    }
    return resolve({
      dataString,
      key,
    });
  });
}

module.exports = transform;