ass-compiler/src/parser/text.js

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

import { parseDrawing } from './drawing.js';
import { parseTags } from './tags.js';

export function parseText(text) {
  const pairs = text.split(/{(.*?)}/);
  const parsed = [];
  if (pairs[0].length) {
    parsed.push({ tags: [], text: pairs[0], drawing: [] });
  }
  for (let i = 1; i < pairs.length; i += 2) {
    const tags = parseTags(pairs[i]);
    const isDrawing = tags.reduce((v, tag) => (tag.p === undefined ? v : !!tag.p), false);
    parsed.push({
      tags,
      text: isDrawing ? '' : pairs[i + 1],
      drawing: isDrawing ? parseDrawing(pairs[i + 1]) : [],
    });
  }
  return {
    raw: text,
    combined: parsed.map((frag) => frag.text).join(''),
    parsed,
  };
}