@sanity/block-content-to-markdown/lib/serializers.js

Transforming Sanity block content to markdown

'use strict';

var _require = require('@sanity/block-content-to-hyperscript/internals'),
    getImageUrl = _require.getImageUrl;

function renderChildren(props) {
  var divider = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '';

  return Array.isArray(props.children) ? props.children.join(divider) : props.children;
}

function block(props) {
  var style = props.node.style || 'normal';

  if (/^h\d$/.test(style)) {
    var hashes = new Array(parseInt(style[1], 10) + 1).join('#');
    return hashes + ' ' + renderChildren(props);
  }

  if (style === 'blockquote') {
    return '> ' + renderChildren(props);
  }

  return renderChildren(props);
}

function RawMarkSerializer(char, padWhitespace, props) {
  var children = renderChildren(props);

  if (padWhitespace) {
    var startContent = children.search(/\S/);
    var endContent = children.search(/\S(?=\s*$)/);

    if (endContent == -1 || startContent == -1) {
      return children;
    }

    var start = children.substring(0, startContent);
    var end = children.substring(endContent + 1);

    var content = children.substring(startContent, endContent + 1);

    return '' + start + char + content + char + end;
  }

  return '' + char + children + char;
}

function link(props) {
  var _props$mark = props.mark,
      href = _props$mark.href,
      title = _props$mark.title;

  var linkTitle = title ? ' ' + JSON.stringify(title) : '';
  return '[' + renderChildren(props) + '](' + href + linkTitle + ')';
}

function list(props) {
  var indentation = new Array(props.level || 1).join('  ');
  return indentation + renderChildren(props, '\n' + indentation);
}

function listItem(props) {
  var isBullet = props.node.listItem === 'bullet';
  var char = isBullet ? '*' : props.index + 1 + '.';
  return char + ' ' + renderChildren(props);
}

function image(props) {
  var title = props.title,
      alt = props.alt;

  var url = getImageUrl(props);
  var imgTitle = title ? ' ' + JSON.stringify(title) : '';
  return '![' + (alt || '') + '](' + url + imgTitle + ')';
}

function container(props) {
  return renderChildren(props, '\n\n');
}

function hardBreak() {
  return '  \n';
}

module.exports = {
  types: {
    block: block,
    image: image
  },

  marks: {
    'strike-through': RawMarkSerializer.bind(null, '~~', true),
    em: RawMarkSerializer.bind(null, '_', true),
    code: RawMarkSerializer.bind(null, '`', false),
    strong: RawMarkSerializer.bind(null, '**', true),
    underline: renderChildren,
    link: link
  },

  list: list,
  listItem: listItem,
  container: container,
  hardBreak: hardBreak,
  markFallback: renderChildren
};
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