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Today's Topics:
1. Parsing keywords (Mike Houghton)
2. Re: Parsing keywords (Francesco Ariis)
----------------------------------------------------------------------
Message: 1
Date: Sat, 3 Oct 2015 10:12:20 +0100
From: Mike Houghton <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: [Haskell-beginners] Parsing keywords
Message-ID: <[email protected]>
Content-Type: text/plain; charset=utf-8
Hi,
What is the idiomatic way of parsing keywords, in a case agnostic fashion, for
a ?mini-language??
For example I?m creating some structured text?
project{
env{
}
setup{
}
run{
}
}
that has ?project?, ?env?, ?setup? and ?run? as keywords and I want to parse in
such a way that ?PROJECT?, ?ProJect? etc are all recognised as the keyword
?project? similarly for ?env? etc.
I?m using monadic rather than applicative parsing.
Many Thanks
Mike
------------------------------
Message: 2
Date: Sat, 3 Oct 2015 11:21:38 +0200
From: Francesco Ariis <[email protected]>
To: [email protected]
Subject: Re: [Haskell-beginners] Parsing keywords
Message-ID: <[email protected]>
Content-Type: text/plain; charset=utf-8
On Sat, Oct 03, 2015 at 10:12:20AM +0100, Mike Houghton wrote:
> Hi,
>
> What is the idiomatic way of parsing keywords, in a case agnostic
> fashion, for a ?mini-language??
I lifted this from `Text.ParserCombinators.Parsec.Rfc2234` and used it
in a project of mine (lentil).
ciString s = mapM ciChar s <?> "case insensitive string"
where
ciChar :: Char -> ParIssue Char
ciChar c = char (C.toLower c) <|> char (C.toUpper c)
This assumes you are using Parsec parsing library.
------------------------------
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