dsl_2_txt.js

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

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

const outfile =  fs.openSync(path.replace(/(?:\.[^.]+)?$/, '.txt'), 'w');

const bomRE = /^\uFEFF/;

const dicWidth = 80;
const border = `/${ '*'.repeat(dicWidth - 2) }/\n`;

const isHwRE = /^\S/;
const hwMark = '• ';
const hwWidth = dicWidth - hwMark.length;
const hwWithCJKWidth = Math.floor(hwWidth / 2);
const hwIsHardWrapRE = new RegExp(`\\S{${hwWidth + 1},}`);
const hwWithCJKIsHardWrapRE = new RegExp(`\\S{${hwWithCJKWidth + 1},}`);
const hwDeEscapeRE = /\\([\\\[\]{}@^~<>#()])/g;

const cardIndent = '  ';
const cardWidth = dicWidth - cardIndent.length;
const cardSubIndentTagRE = /\[m(\d+)\]/;
const cardResetSubIndentRE = /\[\/m\]/;
const cardWrappedLineStartRE = /^(?=.)/mg;
const cardDeTagRE = /(?:\[\/?[^\]\\]+\])+/g;
const cardDeEscapeRE = /\\([\\\[\]{}@^~<>#])/g;
const cardEmptyLineRE = /^\s+\\\s+$/;

let   currentWidth;
let   currentIsHardWrapRE;
let   cardSubIndent = '';
let   hwFirst = true;
let   lineNm = 0;
/******************************************************************************/
process.on('exit', () => {
  fs.closeSync(outfile);
});
/******************************************************************************/
fs.writeSync(outfile,
  `\uFEFF${border}` + 
  wrap(0, dicWidth, {mode: 'soft'})(
    fs.readFileSync(path.replace(/(\.[^.]+)?$/, '.ann'), 'utf8')
    .replace(/^\uFEFF?/, '')
  ) +
  border,
null, 'utf8');
/******************************************************************************/
rl.on('line', function(line) {
  lineNm++;
  
  if (lineNm === 1) line = line.replace(bomRE, '');
  
  if (!line.startsWith('#')) {
    if (isHwRE.test(line)) {
      cardSubIndent = '';
      
      line = line.replace(hwDeEscapeRE, '$1');
      
      if (hasCJK(line)) {
        currentWidth = hwWithCJKWidth;
        currentIsHardWrapRE = hwWithCJKIsHardWrapRE;
      } else {
        currentWidth = hwWidth;
        currentIsHardWrapRE = hwIsHardWrapRE;
      }
      
      if (line.length > currentWidth) {
        line = wrap(0, currentWidth, {mode:
          `${currentIsHardWrapRE.test(line)? 'hard' : 'soft'}`
        })(line);
      }
      
      fs.writeSync(outfile,
        `${hwFirst? '\n' : ''}${hwMark}${line}\n`, null, 'utf8');
      
      hwFirst = false;
    } else {
      hwFirst = true;
      
      const cardSubIndentTag = line.match(cardSubIndentTagRE);
      if (cardSubIndentTag) cardSubIndent = ' '.repeat(cardSubIndentTag[1]);
      const resetSubIndent = cardResetSubIndentRE.test(line);
      
      line = line
        .replace(cardDeTagRE, '')
        .replace(cardDeEscapeRE, '$1')
        .replace(cardEmptyLineRE, '')
        .trim();
      
      if(line) {
        if (hasCJK(line)) {
          currentWidth = Math.floor((cardWidth - cardSubIndent.length)  / 2);
        } else {
          currentWidth = cardWidth - cardSubIndent.length;
        }
        currentIsHardWrapRE = new RegExp(`\\S{${currentWidth + 1},}`);
        
        if (line.length > currentWidth) {
          line = wrap(0, currentWidth, {mode:
            `${currentIsHardWrapRE.test(line)? 'hard' : 'soft'}`
          })(line);
        }
      }
      
      fs.writeSync(outfile, `${
        line.replace(cardWrappedLineStartRE, `${cardIndent}${cardSubIndent}`)
      }\n`, null, 'utf8');
      
      if (resetSubIndent) cardSubIndent = '';
    }
  }
});
/******************************************************************************/
function hasCJK(str) {
  return str.length !== stringWidth(str);
}
/******************************************************************************/