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Domain Parser: return the last point.

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This commit is contained in:
Philippe Pittoli 2023-07-25 15:32:42 +02:00
parent 91337d0f57
commit 26b1c59937
1 changed files with 9 additions and 5 deletions
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14
src/DomainParser.purs
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@ -34,11 +34,15 @@ domain = PC.try (string " ") <|> sub_eof
sub_eof :: Parser String String
sub_eof = do
sub <- subdomain
PC.optional (char '.')
maybe_final_point <- PC.optionMaybe (char '.')
eof
if S.length sub > 255
then fail $ "domain length is > 255 bytes (" <> show (S.length sub) <> ")"
else pure sub
let parsed_domain = did_we_parsed_the_final_point maybe_final_point sub
if S.length parsed_domain > 255
then fail $ "domain length is > 255 bytes (" <> show (S.length parsed_domain) <> ")"
else pure parsed_domain
where
did_we_parsed_the_final_point Nothing sub = sub
did_we_parsed_the_final_point (Just _) sub = sub <> "."
-- From RFC 1035: <subdomain> ::= <label> | <subdomain> "." <label>
subdomain :: Parser String String
@ -46,7 +50,7 @@ subdomain = do
-- First: read a label. This is bare minimum for a subdomain.
lab <- label
-- Second: the rest is optional.
r <- PC.optionMaybe point_sub
r <- PC.optionMaybe (PC.try point_sub)
case r of
Nothing -> pure lab
Just sub -> pure $ lab <> sub