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Diffstat (limited to 'src/GF/OldParsing/ConvertMCFGtoCFG.hs')
| -rw-r--r-- | src/GF/OldParsing/ConvertMCFGtoCFG.hs | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/src/GF/OldParsing/ConvertMCFGtoCFG.hs b/src/GF/OldParsing/ConvertMCFGtoCFG.hs new file mode 100644 index 000000000..06965994c --- /dev/null +++ b/src/GF/OldParsing/ConvertMCFGtoCFG.hs @@ -0,0 +1,52 @@ +---------------------------------------------------------------------- +-- | +-- Module : ConvertMCFGtoCFG +-- Maintainer : PL +-- Stability : (stable) +-- Portability : (portable) +-- +-- > CVS $Date: 2005/04/11 13:52:53 $ +-- > CVS $Author: peb $ +-- > CVS $Revision: 1.1 $ +-- +-- Converting MCFG grammars to (possibly overgenerating) CFG +----------------------------------------------------------------------------- + + +module GF.OldParsing.ConvertMCFGtoCFG + (convertGrammar) where + +import GF.System.Tracing +import GF.Printing.PrintParser + +import Monad +import GF.OldParsing.Utilities +import qualified GF.OldParsing.MCFGrammar as MCFG +import qualified GF.OldParsing.CFGrammar as CFG +import GF.OldParsing.GrammarTypes + +convertGrammar :: MCFGrammar -> CFGrammar +convertGrammar gram = tracePrt "#cf-rules" (prt.length) $ + concatMap convertRule gram + +convertRule :: MCFRule -> [CFRule] +convertRule (MCFG.Rule cat args record name) + = [ CFG.Rule (CFCat cat lbl) rhs (CFName name profile) | + MCFG.Lin lbl lin <- record, + let rhs = map (mapSymbol convertArg id) lin, + let profile = map (argPlaces lin) [0 .. length args-1] + ] + +convertArg (cat, lbl, _arg) = CFCat cat lbl + +argPlaces lin arg = [ place | ((_cat, _lbl, arg'), place) <- + zip (filterCats lin) [0::Int ..], arg == arg' ] + +filterCats syms = [ cat | Cat cat <- syms ] + + + + + + + |
