Copyright	(c) 2019-2023 Dakotah Lambert
Safe Haskell	Safe-Inferred
Language	Haskell2010

LTK.Porters.ATT

Contents

Importing
Exporting

Description

This module provides methods to convert automata to and from the AT&T FSM format. Generally there will be up to three text files, the contents of which can be merged via embedSymbolsATT. When exporting, you should similarly use extractSymbolsATT to unmerge the resulting files.

Since: 0.3

Synopsis

embedSymbolsATT :: String -> Maybe String -> Maybe String -> String
extractSymbolsATT :: String -> (String, String, String)
invertATT :: String -> String
readATT :: String -> FSA Integer String
exportATT :: (Ord n, Ord e, Show e) => FSA n e -> String

Documentation

embedSymbolsATT :: String -> Maybe String -> Maybe String -> String #

Take three strings and merge them in such a way that (from ATT) can understand the result. The three strings should represent the transitions, input symbols, and output symbols, respectively.

extractSymbolsATT :: String -> (String, String, String) #

Convert the output of (to ATT) into strings suitable for inclusion. The result represents the transitions, input symbols, and output symbols in that order.

invertATT :: String -> String #

Convert an AT&T format string into one where input and output symbols have been reversed.

Importing

readATT :: String -> FSA Integer String #

Import an FSA from its representation in AT&T format. Note that this import is not perfect; it discards weights and returns only the input projection.

Exporting

exportATT :: (Ord n, Ord e, Show e) => FSA n e -> String #

Convert an FSA into its AT&T format, with one caveat: The LTK internal format allows for symbols that the AT&T format does not understand, and no attempt is made to work around this. Nonnumeric symbols are exported as-is, while numeric symbols are necessarily mapped to their tags in the symbols file(s).