Markdown parser, done right. 100% CommonMark support, extensions, syntax plugins & high speed
https://markdown-it.github.io/
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62 lines
1.7 KiB
62 lines
1.7 KiB
// Process links like https://example.org/
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'use strict';
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// RFC3986: scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
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var SCHEME_RE = /(?:^|[^a-z0-9.+-])([a-z][a-z0-9.+-]*)$/i;
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module.exports = function linkify(state, silent) {
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var pos, max, match, proto, link, url, fullUrl, token;
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if (!state.md.options.linkify) return false;
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if (state.linkLevel > 0) return false;
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pos = state.pos;
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max = state.posMax;
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if (pos + 3 > max) return false;
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if (state.src.charCodeAt(pos) !== 0x3A/* : */) return false;
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if (state.src.charCodeAt(pos + 1) !== 0x2F/* / */) return false;
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if (state.src.charCodeAt(pos + 2) !== 0x2F/* / */) return false;
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match = state.pending.match(SCHEME_RE);
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if (!match) return false;
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proto = match[1];
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link = state.md.linkify.matchAtStart(state.src.slice(pos - proto.length));
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if (!link) return false;
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url = link.url;
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// invalid link, but still detected by linkify somehow;
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// need to check to prevent infinite loop below
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if (url.length <= proto.length) return false;
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// disallow '*' at the end of the link (conflicts with emphasis)
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url = url.replace(/\*+$/, '');
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fullUrl = state.md.normalizeLink(url);
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if (!state.md.validateLink(fullUrl)) return false;
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if (!silent) {
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state.pending = state.pending.slice(0, -proto.length);
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token = state.push('link_open', 'a', 1);
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token.attrs = [ [ 'href', fullUrl ] ];
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token.markup = 'linkify';
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token.info = 'auto';
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token = state.push('text', '', 0);
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token.content = state.md.normalizeLinkText(url);
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token = state.push('link_close', 'a', -1);
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token.markup = 'linkify';
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token.info = 'auto';
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}
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state.pos += url.length - proto.length;
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return true;
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};
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