added Predef.SOFT_BIND. This special token allows zero or more spaces between ordinary tokens. It is also used in the English RGL to attach the commas to the previous word.

src/english/NounEng.gf

@@ -22,7 +22,7 @@ concrete NounEng of Noun = CatEng ** open MorphoEng, ResEng, Prelude in {
       } ;
 
     RelNP np rs = {
-      s = \\c => np.s ! c ++ "," ++ rs.s ! np.a ++ finalComma ;
+      s = \\c => np.s ! c ++ frontComma ++ rs.s ! np.a ++ finalComma ;
       a = np.a
       } ;
 
@@ -32,7 +32,7 @@ concrete NounEng of Noun = CatEng ** open MorphoEng, ResEng, Prelude in {
       } ;
 
     ExtAdvNP np adv = {
-      s = \\c => np.s ! c ++ "," ++ adv.s ++ finalComma;
+      s = \\c => np.s ! c ++ frontComma ++ adv.s ++ finalComma;
       a = np.a
       } ;
 

src/english/NumeralEng.gf

@@ -69,7 +69,7 @@ lin pot3plus n m = {
 
   oper
     commaIf : DTail -> Str = \t -> case t of {
-      T3 => "," ;
+      T3 => frontComma ;
       _ => []
       } ;
 

src/english/ParseEng.gf

@@ -90,8 +90,8 @@ lin
           compl = vp.s2 ! np.a
         in
         case o of {
-          ODir => compl ++ "," ++ np.s ! npNom ++ verb.aux ++ vp.ad ++ verb.fin ++ verb.adv ++ verb.inf ;
-          OQuest => verb.aux ++ compl ++ "," ++ np.s ! npNom ++ verb.adv ++ vp.ad ++ verb.fin ++ verb.inf 
+          ODir => compl ++ frontComma ++ np.s ! npNom ++ verb.aux ++ vp.ad ++ verb.fin ++ verb.adv ++ verb.inf ;
+          OQuest => verb.aux ++ compl ++ frontComma ++ np.s ! npNom ++ verb.adv ++ vp.ad ++ verb.fin ++ verb.inf 
           }
     } ;
     
@@ -102,7 +102,7 @@ lin
           compl = vp.s2 ! np.a
         in
         case o of {
-          ODir => compl ++ "," ++ verb.aux ++ verb.adv ++ vp.ad ++ verb.fin ++ verb.inf ++ np.s ! npNom ;
+          ODir => compl ++ frontComma ++ verb.aux ++ verb.adv ++ vp.ad ++ verb.fin ++ verb.inf ++ np.s ! npNom ;
           OQuest => verb.aux ++ compl ++ verb.adv ++ vp.ad ++ verb.fin ++ verb.inf ++ np.s ! npNom
           }
     } ;
@@ -137,7 +137,7 @@ lin
   } ;
 
   ApposNP np1 np2 = {
-    s = \\c => np1.s ! c ++ "," ++ np2.s ! npNom ++ finalComma ;
+    s = \\c => np1.s ! c ++ frontComma ++ np2.s ! npNom ++ finalComma ;
     a = np1.a
   } ;
   

src/english/PhraseEng.gf

@@ -23,6 +23,6 @@ concrete PhraseEng of Phrase = CatEng ** open Prelude, ResEng in {
     PConjConj conj = {s = conj.s2} ; ---
 
     NoVoc = {s = []} ;
-    VocNP np = {s = "," ++ np.s ! npNom} ;
+    VocNP np = {s = frontComma ++ np.s ! npNom} ;
 
 }

src/english/ResEng.gf

@@ -543,6 +543,7 @@ resource ResEng = ParamX ** open Prelude in {
               }
       } ;
 
-  finalComma : Str = pre {"," | "." => []; "" => ","; _ => []} ;
+  finalComma : Str = pre {"," | "." => []; "" => SOFT_BIND ++ ","; _ => []} ;
+  frontComma : Str = SOFT_BIND ++ "," ;
 
 }

src/english/SentenceEng.gf

@@ -57,11 +57,11 @@ concrete SentenceEng of Sentence = CatEng ** open Prelude, ResEng in {
     } ;
 
     AdvS a s = {s = a.s ++ s.s} ;
-    ExtAdvS a s = {s = a.s ++ "," ++ s.s} ;
+    ExtAdvS a s = {s = a.s ++ frontComma ++ s.s} ;
 
-    SSubjS a s b = {s = a.s ++ "," ++ s.s ++ b.s} ;
+    SSubjS a s b = {s = a.s ++ frontComma ++ s.s ++ b.s} ;
 
-    RelS s r = {s = s.s ++ "," ++ r.s ! agrP3 Sg} ;
+    RelS s r = {s = s.s ++ frontComma ++ r.s ! agrP3 Sg} ;
 
   oper
     ctr : CPolarity -> CPolarity = \x -> x ;

src/english/SymbolEng.gf

@@ -33,7 +33,7 @@ lin
   MkSymb s = s ;
 
   BaseSymb = infixSS "and" ;
-  ConsSymb = infixSS "," ;
+  ConsSymb = infixSS frontComma ;
 
 oper
     -- Note: this results in a space before 's, but there's

src/english/VerbEng.gf

@@ -39,7 +39,7 @@ concrete VerbEng of Verb = CatEng ** open ResEng, Prelude in {
     UseComp comp = insertObj comp.s (predAux auxBe) ;
 
     AdvVP vp adv = insertObj (\\_ => adv.s) vp ;
-    ExtAdvVP vp adv = insertObj (\\_ => "," ++ adv.s ++ finalComma) vp ;
+    ExtAdvVP vp adv = insertObj (\\_ => frontComma ++ adv.s ++ finalComma) vp ;
     AdVVP adv vp = insertAdV adv.s vp ;
 
     AdvVPSlash vp adv = insertObj (\\_ => adv.s) vp ** {c2 = vp.c2 ; gapInMiddle = vp.gapInMiddle} ;