a simple clitic analysis command 'ca'

src/compiler/GF/Text/Clitics.hs

@@ -0,0 +1,40 @@
+module GF.Text.Clitics (getClitics,getCliticsText) where
+
+import Data.List
+
+-- AR 6/2/2011
+-- Analyse word as stem+clitic whenever 
+--   (1) clitic is in clitic list
+--   (2) either 
+--      (a) stem is in Lexicon
+--      (b) stem can be analysed as stem0+clitic0
+-- 
+-- Examples: 
+--   Italian amarmi = amar+mi
+--   Finnish autossanikohan = autossa+ni+kohan
+--
+-- The analysis gives all results, including the case where the whole word is in Lexicon.
+-- 
+-- The clitics in the list are expected to be reversed.
+
+getClitics :: (String -> Bool) -> [String] -> String -> [[String]]
+getClitics isLex rclitics = map (reverse . map reverse) . clits . reverse where
+  clits rword = ifLex rword [rclit:more | 
+                  rclit <- rclitics, stem <- splits rclit rword, more <- clits stem]
+  splits c = maybe [] return . stripPrefix c
+
+  ifLex w ws = if isLex (reverse w) then [w] : ws else ws
+
+
+getCliticsText :: (String -> Bool) -> [String] -> [String] -> [String]
+getCliticsText isLex rclitics = 
+  map unwords . sequence . map (map render . getClitics isLex rclitics) 
+ where
+  render = unwords . intersperse "&+"
+
+
+-- example
+
+getClitics1 = getClitics exlex1 exclits1
+exlex1   = flip elem ["auto", "naise", "rahan","maa","maahan","maahankaan"]
+exclits1 = map reverse ["ni","ko","han","pas","nsa","kin","kaan"]