progfay/scrapbox-parser

import { createNodeParser } from "./creator";
import { createPlainNode } from "./PlainNode";

import type { NodeParser } from "./index";
import type { NodeCreator } from "./creator";
import type { LinkNode, PlainNode } from "./type";

const hrefFirstUrlRegExp = /\[https?:\/\/[^\s\]]+\s+[^\]]*[^\s]\]/;
const contentFirstUrlRegExp = /\[[^[\]]*[^\s]\s+https?:\/\/[^\s\]]+\]/;
const bracketedUrlRegExp = /\[https?:\/\/[^\s\]]+\]/;
const httpRegExp = /https?:\/\/[^\s]+/;

const createExternalLinkNode: NodeCreator<LinkNode | PlainNode> = (
  raw,
  opts
) => {
  if (opts.context === "table") {
    return createPlainNode(raw, opts);
  }

  const inner =
    raw.startsWith("[") && raw.endsWith("]")
      ? raw.substring(1, raw.length - 1)
      : raw;

  const isHrefFirst = /^https?:\/\/[^\s\]]/.test(inner);
  const match = (
    isHrefFirst ? /^https?:\/\/[^\s\]]+/ : /https?:\/\/[^\s\]]+$/
  ).exec(inner);
  if (match?.[0] === undefined) return [];

  const content = isHrefFirst
    ? inner.substring(match[0].length)
    : inner.substring(0, match.index - 1);

  return [
    {
      type: "link",
      raw,
      pathType: "absolute",
      href: match[0],
      content: content.trim(),
    },
  ];
};

export const ExternalLinkNodeParser: NodeParser = createNodeParser(
  createExternalLinkNode,
  {
    parseOnNested: true,
    parseOnQuoted: true,
    patterns: [
      hrefFirstUrlRegExp,
      contentFirstUrlRegExp,
      bracketedUrlRegExp,
      httpRegExp,
    ],
  }
);