fix the tabular printing when there is a V constructor

src/compiler/GF/Grammar/ShowTerm.hs

@@ -0,0 +1,40 @@
+module GF.Grammar.ShowTerm where
+
+import GF.Grammar.Grammar
+import GF.Grammar.Printer
+import GF.Grammar.Lookup
+import GF.Data.Operations
+
+import Text.PrettyPrint
+import Data.List  (intersperse)
+
+showTerm :: SourceGrammar -> TermPrintStyle -> TermPrintQual -> Term -> String
+showTerm gr style q t = render $
+  case style of
+    TermPrintTable   -> vcat [p <+> s | (p,s) <- ppTermTabular gr q t]
+    TermPrintAll     -> vcat [      s | (p,s) <- ppTermTabular gr q t]
+    TermPrintDefault -> ppTerm q 0 t
+
+ppTermTabular :: SourceGrammar -> TermPrintQual -> Term -> [(Doc,Doc)]
+ppTermTabular gr q = pr where
+  pr t = case t of
+    R rs   -> 
+      [(ppLabel lab       <+> char '.'  <+> path, str) | (lab,(_,val)) <- rs, (path,str) <- pr val]
+    T _ cs -> 
+      [(ppPatt q 0 patt     <+> text "=>" <+> path, str) | (patt,  val ) <- cs, (path,str) <- pr val]
+    V ty cs -> 
+      let pvals = case allParamValues gr ty of
+                    Ok pvals -> pvals
+                    Bad _    -> map Meta [1..]
+      in [(ppTerm q 0 pval <+> text "=>" <+> path, str) | (pval, val) <- zip pvals cs, (path,str) <- pr val]
+    _      -> [(empty,ps t)]
+  ps t = case t of
+    K s   -> text s
+    C s u -> ps s <+> ps u
+    FV ts -> hsep (intersperse (char '/') (map ps ts))
+    _     -> ppTerm q 0 t
+
+data TermPrintStyle
+  = TermPrintTable
+  | TermPrintAll
+  | TermPrintDefault