tesseract.js/src/utils/circularize.js

/**
 * In the recognition result of tesseract, there
 * is a deep JSON object for details, it has around
 *
 * The result of dump.js is a big JSON tree
 * which can be easily serialized (for instance
 * to be sent from a webworker to the main app
 * or through Node's IPC), but we want
 * a (circular) DOM-like interface for walking
 * through the data.
 *
 * @fileoverview DOM-like interface for walking through data
 * @author Kevin Kwok <antimatter15@gmail.com>
 * @author Guillermo Webster <gui@mit.edu>
 * @author Jerome Wu <jeromewus@gmail.com>
 */

module.exports = (page) => {
  const blocks = [];
  const paragraphs = [];
  const lines = [];
  const words = [];
  const symbols = [];

  page.blocks.forEach((block) => {
    block.paragraphs.forEach((paragraph) => {
      paragraph.lines.forEach((line) => {
        line.words.forEach((word) => {
          word.symbols.forEach((sym) => {
            symbols.push({
              ...sym, page, block, paragraph, line, word,
            });
          });
          words.push({
            ...word, page, block, paragraph, line,
          });
        });
        lines.push({
          ...line, page, block, paragraph,
        });
      });
      paragraphs.push({
        ...paragraph, page, block,
      });
    });
    blocks.push({
      ...block, page,
    });
  });

  return {
    ...page, blocks, paragraphs, lines, words, symbols,
  };
};