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// Process links like https://example.org/
// RFC3986: scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
const SCHEME_RE = /(?:^|[^a-z0-9.+-])([a-z][a-z0-9.+-]*)$/i
export default function linkify (state, silent) {
if (!state.md.options.linkify) return false
if (state.linkLevel > 0) return false
const pos = state.pos
const max = state.posMax
if (pos + 3 > max) return false
if (state.src.charCodeAt(pos) !== 0x3A/* : */) return false
if (state.src.charCodeAt(pos + 1) !== 0x2F/* / */) return false
if (state.src.charCodeAt(pos + 2) !== 0x2F/* / */) return false
const match = state.pending.match(SCHEME_RE)
if (!match) return false
const proto = match[1]
const link = state.md.linkify.matchAtStart(state.src.slice(pos - proto.length))
if (!link) return false
let url = link.url
// invalid link, but still detected by linkify somehow;
// need to check to prevent infinite loop below
if (url.length <= proto.length) return false
// disallow '*' at the end of the link (conflicts with emphasis)
url = url.replace(/\*+$/, '')
const fullUrl = state.md.normalizeLink(url)
if (!state.md.validateLink(fullUrl)) return false
if (!silent) {
state.pending = state.pending.slice(0, -proto.length)
const token_o = state.push('link_open', 'a', 1)
token_o.attrs = [['href', fullUrl]]
token_o.markup = 'linkify'
token_o.info = 'auto'
const token_t = state.push('text', '', 0)
token_t.content = state.md.normalizeLinkText(url)
const token_c = state.push('link_close', 'a', -1)
token_c.markup = 'linkify'
token_c.info = 'auto'
}
state.pos += url.length - proto.length
return true
}
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