count_dsl_elements.js

'use strict';
/******************************************************************************/
const path = process.argv[2];
if (!path) {
  console.log('Add the file path, please.');
  process.exit();
}
/******************************************************************************/
const fs = require('fs');

const rl = require('readline').createInterface({
  input: fs.createReadStream(path, {encoding: 'utf8'}), //ascii utf8 utf16le
  terminal: false,
  historySize: 0
});

const formatNumberRE = /\B(?=(?:\d{3})+$)/g;

const headwordsRE = /^\S/;
const cardsRE = /\[b\]1\./;
const interpretationsRE = /\[\/b\]/;

let   headwords = 0;
let   cards = 0;
let   interpretations = 0;
let   lines = 0;
/******************************************************************************/
rl.on('line', function(line) {
  lines++;
  
  if (lines === 1) line = line.replace(/^\uFEFF/, '');
  
  if (!line.startsWith('#')) {
    if (headwordsRE.test(line)) {
      headwords++;
    } else {
      if (cardsRE.test(line)) cards++;
      if (interpretationsRE.test(line)) interpretations++;
    }
  }
}).on('close', () => {
  console.log(
////////////////////////////////////////////////////////////////////////////////
`
Headwords:       ${       headwords.toString().replace(formatNumberRE, ' ') }
Cards:           ${           cards.toString().replace(formatNumberRE, ' ') }
Interpretations: ${ interpretations.toString().replace(formatNumberRE, ' ') }
Lines:           ${           lines.toString().replace(formatNumberRE, ' ') }
`
////////////////////////////////////////////////////////////////////////////////
  );
});
/******************************************************************************/