ass-compiler/src/parser/dialogue.js

Parses and compiles ASS subtitle format to easy-to-use data structure.

import { parseEffect } from './effect.js';
import { parseText } from './text.js';
import { parseTime } from './time.js';

export function parseDialogue(text, format) {
  let fields = text.split(',');
  if (fields.length > format.length) {
    const textField = fields.slice(format.length - 1).join();
    fields = fields.slice(0, format.length - 1);
    fields.push(textField);
  }

  const dia = {};
  for (let i = 0; i < fields.length; i++) {
    const fmt = format[i];
    const fld = fields[i].trim();
    switch (fmt) {
      case 'Layer':
      case 'MarginL':
      case 'MarginR':
      case 'MarginV':
        dia[fmt] = fld * 1;
        break;
      case 'Start':
      case 'End':
        dia[fmt] = parseTime(fld);
        break;
      case 'Effect':
        dia[fmt] = parseEffect(fld);
        break;
      case 'Text':
        dia[fmt] = parseText(fld);
        break;
      default:
        dia[fmt] = fld;
    }
  }

  return dia;
}