> Do you mean that if a command is being parsed, and some invalid input
appears, after skipping the invalid inputs we should continue parsing that
same command, instead of starting to parse a new one?
Yes
> In other words: should your example return one parsed command, or two?
So in this example
example :: Producer B.ByteString IO ()
example = do
yield "foobarbaz"
yield "foo"
yield "bar"
yield "invalid" -- skip over invalid input
yield "baz"
yield "foo"
yield "escape" -- exit early from parse based on specific value
yield "foobarbaz"
I would like there to be 3 parsed commands that get returned.
On Saturday, October 24, 2015 at 2:54:05 PM UTC-6, Daniel Díaz wrote:
>
> I have another doubt. When you say:
>
> > Basically I want to make it so that when there is an invalid input it
> will just skip it and continue where it left off.
>
> Do you mean that if a command is being parsed, and some invalid input
> appears, after skipping the invalid inputs we should continue parsing that
> same command, instead of starting to parse a new one?
>
> In other words: should your example return one parsed command, or two?
>
> On Saturday, October 24, 2015 at 5:04:36 PM UTC+2, Michael Whitehead wrote:
>>
>> If you mean like "foo\nbar\nbaz\n" then yes I can do that. I don't think
>> I could do a delimiter for the command as a whole. Something like
>> "foobarbaz\n" would not work.
>>
>> On Saturday, October 24, 2015 at 3:30:07 AM UTC-6, Daniel Díaz wrote:
>>>
>>> In your use case, do different commads have a clear delimiter character,
>>> like a newline? That would simplify things.
>>>
>>> On Saturday, October 24, 2015 at 7:30:57 AM UTC+2, Michael Whitehead
>>> wrote:
>>>>
>>>> Not sure if I should try to solve my problem with attoparsec itself or
>>>> with pipes. Either way I don't really know where to start so I would
>>>> appreciate it if someone could help me a little.
>>>>
>>>> {-# LANGUAGE OverloadedStrings #-}
>>>>
>>>> module Main where
>>>>
>>>> import qualified Data.ByteString as B
>>>> import Pipes
>>>> import qualified Pipes.Prelude as P
>>>> import qualified Pipes.Attoparsec as P
>>>> import Data.Attoparsec.ByteString.Char8 as A
>>>>
>>>>
>>>> data Foo = Foo deriving Show
>>>> data Bar = Bar deriving Show
>>>> data Baz = Baz deriving Show
>>>> data Command = Command Foo Bar Baz deriving Show
>>>> data Escape = Escape deriving Show
>>>>
>>>> fooParser :: Parser Foo
>>>> fooParser = string "foo" >> return Foo
>>>>
>>>> barParser :: Parser Bar
>>>> barParser = string "bar" >> return Bar
>>>>
>>>> bazParser :: Parser Baz
>>>> bazParser = string "baz" >> return Baz
>>>>
>>>> exitParser :: Parser Escape
>>>> exitParser = string "escape" >> return Escape
>>>>
>>>> commandParser :: Parser Command
>>>> commandParser =
>>>> Command <$> fooParser
>>>> <*> barParser
>>>> <*> bazParser
>>>>
>>>>
>>>> example :: Producer B.ByteString IO ()
>>>> example = do
>>>> yield "foobarbaz"
>>>> yield "foo"
>>>> yield "bar"
>>>> yield "invalid" -- skip over invalid input
>>>> yield "baz"
>>>> yield "foo"
>>>> yield "escape" -- exit early from parse based on specific value
>>>> yield "foobarbaz"
>>>>
>>>> main :: IO ()
>>>> main = do
>>>> runEffect $ P.parsed commandParser example >-> P.print
>>>> return ()
>>>>
>>>>
>>>> Basically I want to make it so that when there is an invalid input it
>>>> will just skip it and continue where it left off. Also I would like to be
>>>> able to handle special values that will allow an exit from the parsing so
>>>> I
>>>> can start fresh.
>>>>
>>>
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