All files / lib/md read.js

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'use strict';
const stream = require('stream');
const todo = require('../todo');
 
/*
 * PUBLIC API
 */
class SplitParagraphs extends stream.Transform {
  constructor() {
    super();
    this._buffer = '';
  }
 
  _transform(chunk, _, cb) {
    const array = (this._buffer + chunk.toString()).split('\n\n');
 
    while (array.length > 1) {
      const paragraph = array.shift();
      this.push(paragraph);
    }
 
    this._buffer = array[0];
    cb();
  }
 
  _flush(cb) {
    Iif (/^\s*$/.test(this._buffer)) {
      cb();
    }
    else {
      this.push(this._buffer.replace(/\n+$/, ''));
      cb();
    }
  }
}
 
class Deserialize extends stream.Writable {
  constructor(project) {
    super();
 
    Iif (!(project instanceof todo.Project)) {
      throw new TypeError('Expecting object of type todo.Project');
    }
 
    this._project = project;
    this._state = 0;
  }
 
  _write(chunk, _, cb) {
    if (this._state) {
      try {
        const [title, rest] = chunk.toString().split(/\n((.|\n)+)/);
        const [desc, items] = deserializeParagraph(rest);
 
        const list = new todo.List(deserializeTitle(title, 2), desc ? desc : '');
        deserializeItems(list, items);
        this._project.insertList(list);
 
        cb();
      }
      catch (err) {
        cb(err);
      }
    }
    else {
      try {
        const [title, desc] = chunk.toString().split(/\n((.|\n)+)/);
        this._project.title = deserializeTitle(title, 1);
        this._project.desc = desc;
 
        ++this._state;
        cb();
      }
      catch (err) {
        cb(err);
      }
    }
  }
}
 
 
/*
 * PRIVATE FUNCTIONS
 */
function deserializeTitle(string, level) {
  const re = new RegExp('^#{' + level + '}[^#]');
  if (!re.exec(string)) {
    throw new Error(`Expected an H${level} '${string}'`);
  }
 
  return string.substring(level);
}
 
function deserializeParagraph(string) {
  Iif (!string || string.length === 0) {
    return [undefined, undefined];
  }
 
  if (/^\s*[-*]/.test(string)) {
    return [undefined, string];
  }
  return string.split(/\n(\s*[-*](.|\n)*)/);
}
 
function deserializeItems(list, string) {
  Iif (!string) {
    return;
  }
 
  string.split('\n').forEach(item => {
    const match = item.match(/^\s*[-*]\s*\[( |x)\]\s*(.*)/i);
 
    Iif (!match) {
      throw new TypeError(`Invalid todo item '${item}'`);
    }
 
    list.insertItem(match[2], (match[1] !== ' '));
  });
}
 
 
/*
 * MODULE EXPORTS
 */
module.exports = {
  SplitParagraphs,
  Deserialize
};