[Haskell-cafe] Re: Parsec and network data

Johannes Waldmann wrote:

Imagine you're writing a parser for a simple programming language. A program is a sequence of statements. Fine, you do "readFile" (once) and then apply a pure Parsec parser.

Then you decide to include "import" statements in your language. Suddenly the parser needs to do IO. Assume the import statements need not be the first statements of the program (there may be headers, comments etc. before). Then you really have to interweave the parsing and the IO.

If anyone has a nice solution to this, please tell. - J.W.

Design your language in a way that the *parse* tree does not depend on import statements? I.e. Chasing imports is performed after you've got an abstract syntax tree. Regards, apfelmus