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"""Process links like https://example.org/"""
import re
from .state_inline import StateInline
# RFC3986: scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
SCHEME_RE = re.compile(r"(?:^|[^a-z0-9.+-])([a-z][a-z0-9.+-]*)$", re.IGNORECASE)
def linkify(state: StateInline, silent: bool) -> bool:
"""Rule for identifying plain-text links."""
if not state.md.options.linkify:
return False
if state.linkLevel > 0:
return False
if not state.md.linkify:
raise ModuleNotFoundError("Linkify enabled but not installed.")
pos = state.pos
maximum = state.posMax
if (
(pos + 3) > maximum
or state.src[pos] != ":"
or state.src[pos + 1] != "/"
or state.src[pos + 2] != "/"
):
return False
if not (match := SCHEME_RE.match(state.pending)):
return False
proto = match.group(1)
if not (link := state.md.linkify.match_at_start(state.src[pos - len(proto) :])):
return False
url: str = link.url
# disallow '*' at the end of the link (conflicts with emphasis)
url = url.rstrip("*")
full_url = state.md.normalizeLink(url)
if not state.md.validateLink(full_url):
return False
if not silent:
state.pending = state.pending[: -len(proto)]
token = state.push("link_open", "a", 1)
token.attrs = {"href": full_url}
token.markup = "linkify"
token.info = "auto"
token = state.push("text", "", 0)
token.content = state.md.normalizeLinkText(url)
token = state.push("link_close", "a", -1)
token.markup = "linkify"
token.info = "auto"
state.pos += len(url) - len(proto)
return True