Preprocessor for fluent tests

preprocess.js

//--// 
const ppStart = '^\/\/--\/\/ ';
const ppLineRE = new RegExp(`${ppStart}(.*)[\n$]`, 'gm');

function parseDirective(dir) {
  const result = {
    pos: null,
    code:  null
  };
  const fields = dir.split(',').map(field => field.trim());

  fields.forEach(field => {
    let [key, value] = field.split(':').map(tok => tok.trim());
    result[key] = value;
  });
  return result;
}

function preprocess(source) {
  let match;
  while ((match = ppLineRE.exec(source)) !== null) {
    console.log(parseDirective(match[1]));
  }
  return source.replace(ppLineRE, '');
}

let tests = [
  [
    `
key = Value
//--// pos: 23, code: E0234
//--// pos: 32, code: E213
key2 = Value 2
    `
  ]
];

console.log(preprocess(tests[0][0]));