Allow disabling of specific block rules

[jaredly]

It's awesome that remark-parser is built in a modular fashion, but there doesn't seem to be a way to take advantage of that modularity.
I'd love to be able to say "parse this string w/o lists or headings", in the way that I can with remarkable see example

[wooorm]

Hi Jared! 👋
Sorry for taking a while to get back to you.
You’re correct in that that’s not afancy enable/disable function, but, “there doesn't seem to be a way to take advantage of that modularity” isn’t true. It’s possible to create a plugin for this!

Below is a working plugin, if you wish you can publish it, or just drop it into your own code:

var remark = require('remark');
var inspect = require('unist-util-inspect');

var processor = remark().use(disable, {block: ['list', 'atxHeading', 'setextHeading']});

console.log(inspect(processor.parse('# Heading.\n* List.\n> Blockquote')));

function disable(options) {
  var proto = this.Parser.prototype;
  console.log('block: ', proto.blockMethods);
  console.log('inline: ', proto.inlineMethods);
  ignore('blockMethods', options.block);
  ignore('inlineMethods', options.inline);

  function ignore(key, list) {
    var values = proto[key];
    var index = -1;
    var length = list && list.length;
    var pos;
    while (++index < length) {
      pos = values.indexOf(list[index]);
      if (pos !== -1) {
        values.splice(pos, 1);
      }
    }
  }
}

Yields:

block:  [ 'yamlFrontMatter',
  'newline',
  'indentedCode',
  'fencedCode',
  'blockquote',
  'atxHeading',
  'thematicBreak',
  'list',
  'setextHeading',
  'html',
  'footnote',
  'definition',
  'table',
  'paragraph' ]
inline:  [ 'escape',
  'autoLink',
  'url',
  'html',
  'link',
  'reference',
  'strong',
  'emphasis',
  'deletion',
  'code',
  'break',
  'text' ]
root[3] (1:1-3:13, 0-31)
├─ paragraph[1] (1:1-1:11, 0-10)
│  └─ text: "# Heading." (1:1-1:11, 0-10)
├─ paragraph[1] (2:1-2:8, 11-18)
│  └─ text: "* List." (2:1-2:8, 11-18)
└─ blockquote[1] (3:1-3:13, 19-31)
   └─ paragraph[1] (3:3-3:13, 21-31)
      └─ text: "Blockquote" (3:3-3:13, 21-31)

Cheers! Let me know if you have further questions :) Oh and the Gitter channel is often more responsive than I am on issues :)