Hi. I believe I'm using parsec 3.0.1, although I already fixed the imports (even thou they were working).
Thanks for the references, specially the parsec User Guide - it saved my life, in 30 minutes I actually *understood* my mistake and fixed it. Now my code and it compiles and makes sense, even though it's a bit useless, since it has no return values [yet]. I'll take a look at UUAG and Tiger. However, since this is a simple college assignment, I want my compiler to be as simple as possible but in a way I understand what I'm doing, so I'll probably be doing it by hand. Fernando Henrique Sanches On Mon, Nov 30, 2009 at 2:58 PM, Stephen Tetley <stephen.tet...@gmail.com>wrote: > Hi Fernando > > Which version of Parsec are you using, the one that ships with GHC or > Parsec 3? > > I would imagine whichever you one you are using you have the imports > wrong for these modules: > > import Text.Parsec.Pos > import Text.Parsec.Prim > > should be ... > > import Text.ParserCombinators.Parsec.Pos > import Text.ParserCombinators.Parsec.Prim > > > Also it seems like an applicative instance for Parsec's GenParser > monad is missing. This isn't defined for parsec-2.1.0.1, people seem > to define it themselves: > > -- The Applicative instance for every Monad looks like this. > instance Applicative (GenParser s a) where > pure = return > (<*>) = ap > > ... you will need `ap` from Control.Monad in scope. > > Also there is a pdf document for Parsec (should be available from Daan > Leijen's home page) that covers separate scanners, it has quite a lot > more documentation than Parsec's Haddock docs. > > For semantic analysis I'd highly recommend UUAG, it is well documented > and used for a large compiler (EHC). There is also a version of Andrew > Appel's Tiger language written with it that is much smaller and more > comprehensible, the version on Hackage doesn't seem to contain the > attribute grammar source but it is available here: > > http://www.cs.uu.nl/wiki/bin/view/HUT/TigerCompiler > > http://www.cs.uu.nl/wiki/bin/view/HUT/AttributeGrammarSystem > > Best wishes > > Stephen >
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