Is it possible to get original input of emphasis and strongs?

[Saul-Mirone]

The currently AST can only get structure like:

{
    "type": "emphasis",
    "children": [
        {
            "type": "text",
            "value": "asd",
            "position": {...}
        }
    ],
    "position": {...}
}

Is it possible for users to write a plugin to get the original input marker(_ or *)?

[wooorm]

Yes. Use positional info and the original input file to get the character at the spot the emphasis/strong starts.

[Saul-Mirone]

Could you please give some hint about how to use position with the vfile object?

Currently my code looks like:

export const keepSymbolPlugin = () => {
    function transformer(ast: Parent, file: VFile) {
        visit(ast, 'emphasis', (node) => {
            // TODO: getSymbolByPosition(file, node.position)
        });
    }
    return transformer;
};

But the vfile object seems like an empty file when I try to call toString method on it.

[wooorm]

But the vfile object seems like an empty file

Then you are not passing the file.

hint

/**
 * @typedef {import('mdast').Root} Root
 */

import {visit} from 'unist-util-visit'

/** @type {import('unified').Plugin<Array<void>, Root>} */
export default function myRemarkPluginPrintingEmphasisMarkers() {
  return function (tree, file) {
    visit(tree, 'emphasis', (node) => {
        console.log(file.value.charAt(node.position.start.offset))
    })
  }
}

[Saul-Mirone]

Thanks. I find out that I should pass file options when calling runSync:

const ast = remark.runSync(remark.parse(markdown), markdown/* this is also needed */);