123 lines
3.3 KiB
JavaScript
123 lines
3.3 KiB
JavaScript
import { lookupCache } from "pretty-text/oneboxer";
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import {
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cachedInlineOnebox,
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INLINE_ONEBOX_LOADING_CSS_CLASS,
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INLINE_ONEBOX_CSS_CLASS
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} from "pretty-text/inline-oneboxer";
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const ONEBOX = 1;
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const INLINE = 2;
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function isTopLevel(href) {
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let split = href.split(/https?:\/\/[^\/]+[\/?]/i);
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let hasExtra = split && split[1] && split[1].length > 0;
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return !hasExtra;
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}
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function applyOnebox(state, silent) {
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if (silent || !state.tokens) {
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return;
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}
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for (let i = 1; i < state.tokens.length; i++) {
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let token = state.tokens[i];
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let prev = state.tokens[i - 1];
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let mode =
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prev.type === "paragraph_open" && prev.level === 0 ? ONEBOX : INLINE;
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if (token.type === "inline") {
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let children = token.children;
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for (let j = 0; j < children.length - 2; j++) {
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let child = children[j];
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if (
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child.type === "link_open" &&
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child.markup === "linkify" &&
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child.info === "auto"
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) {
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if (j > children.length - 3) {
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continue;
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}
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if (j === 0 && token.leading_space) {
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mode = INLINE;
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} else if (j > 0) {
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let prevSibling = children[j - 1];
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if (prevSibling.tag !== "br" || prevSibling.leading_space) {
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mode = INLINE;
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}
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}
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// look ahead for soft or hard break
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let text = children[j + 1];
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let close = children[j + 2];
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let lookahead = children[j + 3];
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if (lookahead && lookahead.tag !== "br") {
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mode = INLINE;
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}
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// check attrs only include a href
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let attrs = child.attrs;
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if (!attrs || attrs.length !== 1 || attrs[0][0] !== "href") {
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continue;
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}
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let href = attrs[0][1];
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// edge case ... what if this is not http or protocoless?
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if (!/^http|^\/\//i.test(href)) {
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continue;
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}
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// we already know text matches cause it is an auto link
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if (!close || close.type !== "link_close") {
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continue;
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}
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if (mode === ONEBOX) {
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// we already determined earlier that 0 0 was href
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let cached = lookupCache(attrs[0][1]);
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if (cached) {
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// replace link with 2 blank text nodes and inline html for onebox
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child.type = "html_raw";
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child.content = cached;
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child.inline = true;
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text.type = "html_raw";
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text.content = "";
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text.inline = true;
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close.type = "html_raw";
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close.content = "";
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close.inline = true;
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} else {
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// decorate...
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attrs.push(["class", "onebox"]);
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attrs.push(["target", "_blank"]);
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}
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} else if (mode === INLINE && !isTopLevel(href)) {
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const onebox = cachedInlineOnebox(href);
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if (onebox && onebox.title) {
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text.content = onebox.title;
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attrs.push(["class", INLINE_ONEBOX_CSS_CLASS]);
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} else {
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attrs.push(["class", INLINE_ONEBOX_LOADING_CSS_CLASS]);
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}
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}
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}
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}
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}
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}
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}
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export function setup(helper) {
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helper.registerPlugin(md => {
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md.core.ruler.after("linkify", "onebox", applyOnebox);
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});
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}
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