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sagemathinc
GitHub Repository: sagemathinc/cocalc
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Path:
blob/master/src/packages/frontend/markdown/hashtag-plugin.ts
Views: 179
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/*
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* LICENSE: MIT (same as upstream)
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*/
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/*
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This is a rewrite of https://github.com/svbergerem/markdown-it-hashtag
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LICENSE: MIT (same as the original upstream).
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CHANGES:
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- typescript
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- only one token instead of three, which makes more sense to
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me (better for conversion to slate)
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*/
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function renderHashtag(tokens, idx): string {
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// obviously pretty specific to cocalc...
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// Looks like antd tag, but scales.
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return `<span style="color:#1b95e0;background-color:#fafafa;border:1px solid #d9d9d9;padding:0 7px;border-radius:5px">#${tokens[idx].content}</span>`;
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}
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function isLinkOpen(str) {
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return /^<a[>\s]/i.test(str);
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}
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function isLinkClose(str) {
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return /^<\/a\s*>/i.test(str);
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}
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export function hashtagPlugin(md): void {
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const { arrayReplaceAt, escapeHtml } = md.utils;
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const regex = /(^|\s)#(\w+)/g;
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function hashtag(state) {
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const { Token, tokens: blockTokens } = state;
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for (let j = 0, l = blockTokens.length; j < l; j++) {
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if (blockTokens[j].type !== "inline") {
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continue;
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}
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let tokens = blockTokens[j].children;
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let htmlLinkLevel = 0;
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for (let i = tokens.length - 1; i >= 0; i--) {
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const currentToken = tokens[i];
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// skip content of markdown links
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if (currentToken.type === "link_close") {
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i--;
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while (
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tokens[i].level !== currentToken.level &&
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tokens[i].type !== "link_open"
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) {
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i--;
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}
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continue;
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}
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// skip content of html links
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if (currentToken.type === "html_inline") {
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// we are going backwards, so isLinkOpen shows end of link
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if (isLinkOpen(currentToken.content) && htmlLinkLevel > 0) {
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htmlLinkLevel--;
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}
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if (isLinkClose(currentToken.content)) {
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htmlLinkLevel++;
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}
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}
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if (htmlLinkLevel > 0) {
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continue;
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}
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if (currentToken.type !== "text") {
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continue;
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}
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// find hashtags
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let text = currentToken.content;
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const matches = text.match(regex);
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if (matches === null) {
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continue;
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}
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const nodes: any[] = [];
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const { level } = currentToken;
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for (let m = 0; m < matches.length; m++) {
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const tagName = matches[m].split("#", 2)[1];
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// find the beginning of the matched text
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let pos = text.indexOf(matches[m]);
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// find the beginning of the hashtag
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pos = text.indexOf("#" + tagName, pos);
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if (pos > 0) {
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const token = new Token("text", "", 0);
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token.content = text.slice(0, pos);
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token.level = level;
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nodes.push(token);
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}
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const token = new Token("hashtag", "", 0);
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token.content = escapeHtml(tagName);
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token.level = level;
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nodes.push(token);
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text = text.slice(pos + 1 + tagName.length);
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}
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if (text.length > 0) {
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const token = new Token("text", "", 0);
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token.content = text;
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token.level = level;
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nodes.push(token);
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}
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// replace current node
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blockTokens[j].children = tokens = arrayReplaceAt(tokens, i, nodes);
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}
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}
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}
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md.core.ruler.after("inline", "hashtag", hashtag);
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md.renderer.rules.hashtag = renderHashtag;
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}
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