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;;;
;;;  Authors: Alistair Conkie, Borja Etxebarria and Alan W Black
;;;
;;; letter to sounds rules and functions to produce stressed syllabified
;;; pronunciations for Spanish words
;;; There is some history in one set of the LTS rules back to
;;; Rob van Gerwen, University of Nijmegen.
;;;

;;; Lexicon
(lex.create "spanish")
(lex.set.phoneset "spanish")
(lex.set.lts.method 'spanish_lts) 
(lex.set.lts.ruleset 'spanish)

;;; This which just have to be in the lexicon
;(lex.add.entry '("a" nn (((a) 0))))
(lex.add.entry '("b" nn (((b e) 0))))
(lex.add.entry '("c" nn (((th e) 0))))
(lex.add.entry '("d" nn (((d e) 0))))
;(lex.add.entry '("e" nn (((e) 0))))
(lex.add.entry '("f" nn (((e1) 1)((f e) 0))))
(lex.add.entry '("g" nn (((g e) 0))))
(lex.add.entry '("h" nn (((a1) 1)((ch e) 0))))
;(lex.add.entry '("i" nn (((i) 0))))
(lex.add.entry '("j" nn (((x o1) 1)((t a) 0))))
(lex.add.entry '("k" nn (((k a) 0))))
(lex.add.entry '("l" nn (((e1) 1)((l e) 0))))
(lex.add.entry '("m" nn (((e1) 1)((m e) 0))))
(lex.add.entry '("n" nn (((e1) 1)((n e) 0))))
(lex.add.entry '("~n" nn (((e1) 1)((ny e) 0))))
(lex.add.entry '("ñ" nn (((e1) 1)((ny e) 0))))
;(lex.add.entry '("o" nn (((o) 0))))
(lex.add.entry '("p" nn (((p e) 0))))
(lex.add.entry '("q" nn (((k u) 0))))
(lex.add.entry '("r" nn (((e1) 1)((rr e) 0))))
(lex.add.entry '("s" nn (((e1) 1) ((s e) 0))))
(lex.add.entry '("t" nn (((t e) 0))))
;(lex.add.entry '("u" nn (((u) 0))))
(lex.add.entry '("v" nn (((u1) 1)((b e) 0))))
(lex.add.entry '("w" nn (((u) 0) ((b e) 0) ((d o1) 1) ((b l e) 0))))
(lex.add.entry '("x" nn (((e1) 1)((k i s) 0))))
;(lex.add.entry '("y" nn (((i) 0)((g r i e1) 1))((g a) 0)))   ;; doubt: stres
(lex.add.entry '("z" nn (((th e1) 1)((t a) 0))))
;(lex.add.entry '("á" nn (((a) 0))))
;(lex.add.entry '("é" nn (((e) 0))))
;(lex.add.entry '("í" nn (((i) 0))))
;(lex.add.entry '("ó" nn (((o) 0))))
;(lex.add.entry '("ú" nn (((u) 0))))
;(lex.add.entry '("ü" nn (((u) 0))))
(lex.add.entry 
 '("*" n (((a s) 0) ((t e) 0) ((r i1 s) 1)  ((k o) 0))))
(lex.add.entry 
 '("%" n (((p o r) 0) ((th i e1 n) 1) ((t o) 0))))
(lex.add.entry 
 '("&" n (((a1 m) 1) ((p e r) 0) ((s a n) 0))))
(lex.add.entry 
 '("$" n (((d o1) 1) ((l a r) 0))))
(lex.add.entry 
 '("#" n (((a l) 0) ((m u a) 0) ((d i1) 1) ((ll a) 0))))
(lex.add.entry 
 '("@" n (((a) 0) ((rr o1) 1) ((b a) 0))))
(lex.add.entry 
 '("+" n (((m a s) 0)) ((pos "K7%" "OA%" "T-%"))))
(lex.add.entry 
 '("^" n (((k a1) 1) ((r e t) 0)) ((pos "K6$"))))
(lex.add.entry 
 '("~" n (((t i1 l) 1) ((d e) 0)) ((pos "K6$"))))
(lex.add.entry 
 '("=" n (((i) 0) ((g u a1 l) 1))))
(lex.add.entry 
 '("/" n (((e1 n ) 1) ((t r e) 0))))  ;; $$$division, etc.
(lex.add.entry 
 '("\\" n (((b a1) 1) ((rr a) 1))))
(lex.add.entry 
 '("_" n (((s u b) 0) ((rr a) 0) ((ll a1) 1) ((d o) 0)) ))
(lex.add.entry 
 '("|" n (((b a1) 1) ((rr a) 0))))
(lex.add.entry 
 '(">" n ((( m a ) 0) ((ll o1 r) 1) ((k e) 0))))
(lex.add.entry 
 '("<" n ((( m e ) 0) ((n o1 r) 1) ((k e) 0))))
(lex.add.entry 
 '("[" n ((( a) 0) ((b r i1 r) 1) ((k o r) 0)((ch e1) 1)((t e) 0))))
(lex.add.entry 
 '("]" n (((th e) 0) ((rr a1 r) 1) ((k o r) 0)((ch e1) 1)((t e) 0))))
(lex.add.entry 
 '(" " n (((e s) 0)((p a1) 1)((th i o) 0))))
(lex.add.entry 
 '("\t" n (((t a1 b) 1))))
(lex.add.entry 
 '("\n" n (((n u e1) 1) ((b a) 0)((l i) 1) ((n e a) 0))))

(lex.add.entry '("." punc nil))
(lex.add.entry '("." nn (((p u1 n) 1) ((t o) 0))))
(lex.add.entry '("'" punc nil))
(lex.add.entry '(":" punc nil))
(lex.add.entry '(";" punc nil))
(lex.add.entry '("," punc nil))
(lex.add.entry '("," nn (((k o1) 1) ((m a) 0))))
(lex.add.entry '("-" punc nil))
(lex.add.entry '("\"" punc nil))
(lex.add.entry '("`" punc nil))
(lex.add.entry '("?" punc nil))
(lex.add.entry '("!" punc nil))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;  Down cases with accents
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(lts.ruleset
 spanish_downcase
 ( )
 (
  ( [ a ] = a )
  ( [ e ] = e )
  ( [ i ] = i )
  ( [ o ] = o )
  ( [ u ] = u )
  ( [ á ] = á )
  ( [ é ] = é )
  ( [ í ] = í )
  ( [ ó ] = ó )
  ( [ ú ] = ú )
  ( [ ü ] = ü ) 
  ( [ b ] = b )
  ( [ c ] = c )
  ( [ "ç" ] = s )
  ( [ d ] = d )
  ( [ f ] = f )
  ( [ g ] = g )
  ( [ h ] = h )
  ( [ j ] = j )
  ( [ k ] = k )
  ( [ l ] = l )
  ( [ m ] = m )
  ( [ n ] = n )
  ( [ ñ ] =  ñ )
  ( [ p ] = p )
  ( [ q ] = q )
  ( [ r ] = r )
  ( [ s ] = s )
  ( [ t ] = t )
  ( [ v ] = v )
  ( [ w ] = w )
  ( [ x ] = x )
  ( [ y ] = y )
  ( [ z ] = z )
  ( [ "\'" ] = "\'" )
  ( [ : ] = : )
  ( [ ~ ] = ~ )
  ( [ "\"" ] = "\"" )
  ( [ A ] = a )
  ( [ E ] = e )
  ( [ I ] = i )
  ( [ O ] = o )
  ( [ U ] = u )
  ( [ Á ] = á )
  ( [ É ] = é )
  ( [ Í ] = í )
  ( [ Ó ] = ó )
  ( [ Ú ] = ú )
  ( [ Ü ] = ü ) 
  ( [ B ] = b )
  ( [ C ] = c )
  ( [ "Ç" ] = s )
  ( [ D ] = d )
  ( [ F ] = f )
  ( [ G ] = g )
  ( [ H ] = h )
  ( [ J ] = j )
  ( [ K ] = k )
  ( [ L ] = l )
  ( [ M ] = m )
  ( [ N ] = n )
  ( [ Ñ ] =  ñ )
  ( [ P ] = p )
  ( [ Q ] = q )
  ( [ R ] = r )
  ( [ S ] = s )
  ( [ T ] = t )
  ( [ V ] = v )
  ( [ W ] = w )
  ( [ X ] = x )
  ( [ Y ] = y )
  ( [ Z ] = z )
))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;   Main letter to sound rules
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; borja: some rules updated or deleted.
; Rules for directly accented vowels, are typed using 
; the sun character set and codepage ISO 8859/1 Latin 1. This 
; matches the one on Linux and Windows for our purposes, so 
; almost everybody happy.
; Umlaut (dieresis) management. I have considered
; three diferent ways to include the umlaut for spanish in 
; festival, using <:> or <">. example:  ping:uino  ping"uino,
; and of course, directly typing the weird thing (ü).
; Accented vowels can be typed both directly (á) or as a
; quote preceding the plain vowel ('a). example: cami'on  camión

(lts.ruleset
;  Name of rule set
 spanish
;  Sets used in the rules
(
  (LNS l n s )
  (DNSR d n s r )
  (EI e i é í)  ; note that accented vowels are included in this set
  (AEIOUt  á é í ó ú )
  (V a e i o u )
  (C b c d f g h j k l m n ñ ~ p q r s t v w x y z )
)
;  Rules
(

 ; these weird rule, to break dipthongs at end of words like atribuid atribuido,...
 ( "'" V* C* u [ i ] DNSR # = i ) 
 ( AEIOUt V* C* u [ i ] DNSR # = i )   ;; $$$  ~n and so, what will do?
 ( u [ i ] DNSR # = i1 ) 
 ( "'" V* C* u [ i ] d V # = i ) 
 ( AEIOUt V* C* u [ i ] d V # = i ) 
 ( u [ i ] d AEIOUt # = i )   ;; not sure about these two
 ( u [ i ] d V # = i1 )       ;; 


 ( [ a ] = a )
 ( [ e ] = e )
 ( [ i ] = i )
 ( [ o ] = o )
 ( [ u ] = u )
 ( [ "'" a ] = a1 )
 ( [ "'" e ] = e1 )
 ( [ "'" i ] = i1 )
 ( [ "'" o ] = o1 )
 ( [ "'" u ] = u1 )
 ( [ á ] = a1 )
 ( [ é ] = e1 )
 ( [ í ] = i1 )
 ( [ ó ] = o1 )
 ( [ ú ] = u1 )
 ( [ ":" u ] = u )      ; umlaut (u dieresis) (should not happen, only with g, and already removed)
 ( [ "\"" u ] = u )  
 ( [ ü ] = u ) 

 ( [ b ] = b )
 ( [ v ] = b )
 ( [ c ] "'" EI = th )
 ( [ c ] EI = th )
 ( [ c h ] = ch )
 ( [ c ] = k )
 ( [ d ] = d )
 ( [ f ] = f )
 ( [ g ] "'" EI = x )
 ( [ g ] EI = x )
 ( [ g u ] "'" EI = g )
 ( [ g u ] EI = g )

 ( [ g ":" u ] EI = g u )      ; umlaut (u dieresis)
 ( [ g ":" u ] "'" EI = g u ) 
 ( [ g "\"" u ] EI = g u )  
 ( [ g "\"" u ] "'" EI = g u ) 
 ( [ g ü ] EI = g u ) 
 ( [ g ü ] "'" EI = g u ) 

 ( [ g ] = g )
 ( [ h ] =  )
 ( [ j ] = x )
 ( [ k ] = k )
 ( [ l l ] # = l )
 ( [ l l ] = ll )
 ( [ l ] = l )
 ( [ m ] = m )
 ( [ "~" n ] = ny )
 ( [ ñ ] = ny )
 ( [ n ] = n )
 ( [ p ] = p )
 ( [ p h ] = f )  ;; to speak a bit of greek.
 ( [ q u ] a = k u )  ;; no castillian word uses this, but it would be pronounced this way in greek and foreign words (aquarium, quo, etc)
 ( [ q u ] = k )
 ( [ q ] = k ) ;; should't happend, but if you type it...
 ( [ r r ] = rr )
 ( # [ r ] = rr )
 ( LNS [ r ] = rr )
 ( [ r ] = r )
 ( [ s ] = s )
 ( # [ s ] C = e s )
 ( # [ s ] "'" C = e s )
 ( # [ s ] ":" C = e s )
 ( # [ s ] "\"" C = e s )
 ( [ t ] = t )
 ( [ w ] = u )
 ( [ x ] = k s )

 ( [ y ] # = i )
 ( [ y ] C = i )
 ( [ y ] "'" C = i )
 ( [ y ] ":" C = i )
 ( [ y ] "\"" C = i )
 ( [ y ] = ll )

 ( [ z ] = th )

  ; quotes are used for vowel accents in foreign keyboards (i.e. cami'on).
  ; remove those that were not before a vowel. same with other signs.
 ( [ "'" ] = )  
 ( [ ":" ] = )  
 ( [ "\"" ] = )  
 ( [ "~" ] = )  
))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;  Spanish sylabification by rewrite rules
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(lts.ruleset
   spanish_syl
   (  (V a1 i1 u1 e1 o1 a i u e o )
      (IUT i1 u1 )
      (C b ch d f g x k l ll m n ny p r rr s t th )
   )
   ;; Rules will add - at syllable boundary
   (
      ;; valid CC groups
      ( V C * [ b l ] V = - b l )
      ( V C * [ b r ] V = - b r )
      ( V C * [ k l ] V = - k l )
      ( V C * [ k r ] V = - k r )
      ( V C * [ k s ] V = - k s ) ; for words with "x"
      ( V C * [ d r ] V = - d r )
      ( V C * [ f l ] V = - f l )
      ( V C * [ f r ] V = - f r )
      ( V C * [ g l ] V = - g l )
      ( V C * [ g r ] V = - g r )
      ( V C * [ p l ] V = - p l )
      ( V C * [ p r ] V = - p r )
      ( V C * [ t l ] V = - t l )
      ( V C * [ t r ] V = - t r )

      ;; triptongs
      ( [ i a i ] = i a i )  
      ( [ i a u ] = i a u )  
      ( [ u a i ] = u a i )  
      ( [ u a u ] = u a u )  
      ( [ i e i ] = i e i )  
      ( [ i e u ] = i e u )  
      ( [ u e i ] = u e i )  
      ( [ u e u ] = u e u )  
      ( [ i o i ] = i o i )  
      ( [ i o u ] = i o u )  
      ( [ u o i ] = u o i )  
      ( [ u o u ] = u o u )  
      ( [ i a1 i ] = i a1 i )  
      ( [ i a1 u ] = i a1 u )  
      ( [ u a1 i ] = u a1 i )  
      ( [ u a1 u ] = u a1 u )  
      ( [ i e1 i ] = i e1 i )  
      ( [ i e1 u ] = i e1 u )  
      ( [ u e1 i ] = u e1 i )  
      ( [ u e1 u ] = u e1 u )  
      ( [ i o1 i ] = i o1 i )  
      ( [ i o1 u ] = i o1 u )  
      ( [ u o1 i ] = u o1 i )  
      ( [ u o1 u ] = u o1 u )  

      ;; break invalid triptongs
      ( IUT [ i a ]  = - i a )
      ( IUT [ i e ]  = - i e )
      ( IUT [ i o ]  = - i o )
      ( IUT [ u a ]  = - u a )
      ( IUT [ u e ]  = - u e )
      ( IUT [ u o ]  = - u o )
      ( IUT [ a i ]  = - a i )
      ( IUT [ e i ]  = - e i )
      ( IUT [ o i ]  = - o i )
      ( IUT [ a u ]  = - a u )
      ( IUT [ e u ]  = - e u )
      ( IUT [ o u ]  = - o u )
      ( IUT [ i u ]  = - i u )
      ( IUT [ u i ]  = - u i )
      ( IUT [ i a1 ]  = - i a1 )
      ( IUT [ i e1 ]  = - i e1 )
      ( IUT [ i o1 ]  = - i o1 )
      ( IUT [ u a1 ]  = - u a1 )
      ( IUT [ u e1 ]  = - u e1 )
      ( IUT [ u o1 ]  = - u o1 )
      ( IUT [ a1 i ]  = - a1 i )
      ( IUT [ e1 i ]  = - e1 i )
      ( IUT [ o1 i ]  = - o1 i )
      ( IUT [ a1 u ]  = - a1 u )
      ( IUT [ e1 u ]  = - e1 u )
      ( IUT [ o1 u ]  = - o1 u )
      ( IUT [ i u1 ]  = - i u1 )
      ( IUT [ u i1 ]  = - u i1 )

      ;; diptongs
      ( [ i a ]  = i a )
      ( [ i e ]  = i e )
      ( [ i o ]  = i o )
      ( [ u a ]  = u a )
      ( [ u e ]  = u e )
      ( [ u o ]  = u o )
      ( [ a i ]  = a i )
      ( [ e i ]  = e i )
      ( [ o i ]  = o i )
      ( [ a u ]  = a u )
      ( [ e u ]  = e u )
      ( [ o u ]  = o u )
      ( [ i u ]  = i u )
      ( [ u i ]  = u i )
      ( [ i a1 ]  = i a1 )
      ( [ i e1 ]  = i e1 )
      ( [ i o1 ]  = i o1 )
      ( [ u a1 ]  = u a1 )
      ( [ u e1 ]  = u e1 )
      ( [ u o1 ]  = u o1 )
      ( [ a1 i ]  = a1 i )
      ( [ e1 i ]  = e1 i )
      ( [ o1 i ]  = o1 i )
      ( [ a1 u ]  = a1 u )
      ( [ e1 u ]  = e1 u )
      ( [ o1 u ]  = o1 u )
      ( [ u1 i ]  = u1 i )
      ( [ i1 u ]  = i1 u )
    
      ;; Vowels preceeded by vowels are syllable breaks
      ;; triptongs and diptongs are dealt with above
      ( V [ a ]  = - a )
      ( V [ i ]  = - i )
      ( V [ u ]  = - u )
      ( V [ e ]  = - e )
      ( V [ o ]  = - o )
      ( V [ a1 ]  = - a1 )
      ( V [ e1 ]  = - e1 )
      ( V [ i1 ]  = - i1 )
      ( V [ o1 ]  = - o1 )
      ( V [ u1 ]  = - u1 )

      ;; If any consonant is followed by a vowel and there is a vowel
      ;; before it, its a syl break
      ;; the consonant cluster are dealt with above
      ( V C * [ b ] V = - b )
      ( V C * [ ch ] V = - ch )
      ( V C * [ d ] V = - d )
      ( V C * [ f ] V = - f )
      ( V C * [ g ] V = - g )
      ( V C * [ x ] V = - x )
      ( V C * [ k ] V = - k )
      ( V C * [ l ] V = - l )
      ( V C * [ ll ] V = - ll )
      ( V C * [ m ] V = - m )
      ( V C * [ n ] V = - n )
      ( V C * [ ny ] V = - ny )
      ( V C * [ p ] V = - p )
      ( V C * [ r ] V = - r )
      ( V C * [ rr ] V = - rr )
      ( V C * [ s ] V = - s )
      ( V C * [ t ] V = - t )
      ( V C * [ th ] V = - th )

      ;; Catch all consonants on their own (at end of word)
      ;; and vowels not preceded by vowels are just written as it
      ( [ b ] = b )
      ( [ ch ] = ch )
      ( [ d ] = d )
      ( [ f ] = f )
      ( [ g ] = g )
      ( [ x ] = x )
      ( [ k ] = k )
      ( [ l ] = l )
      ( [ ll ] = ll )
      ( [ m ] = m )
      ( [ n ] = n )
      ( [ ny ] = ny )
      ( [ p ] = p )
      ( [ r ] = r )
      ( [ rr ] = rr )
      ( [ s ] = s )
      ( [ t ] = t )
      ( [ th ] = th )
      ( [ a ]  =  a )
      ( [ i ]  =  i )
      ( [ u ]  =  u )
      ( [ e ]  =  e )
      ( [ o ]  =  o )
      ( [ a1 ]  =  a1 )
      ( [ i1 ]  =  i1 )
      ( [ u1 ]  =  u1 )
      ( [ e1 ]  =  e1 )
      ( [ o1 ]  =  o1 )
   )
)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;  Stress assignment in unstress words by rewrite rules
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(lts.ruleset
 ;; Assign stress to a vowel when non-exists
 spanish.stress
 (
  (UV a i u e o)
  (V a1 i1 u1 e1 o1  a i u e o)
  (V1 a1 i1 u1 e1 o1)
  (VNS n s a i u e o)
  (C b ch d f g j k l ll m n ny p r rr s t th x )
  (VC b ch d f g j k l ll m n ny p r rr s t th x a1 i1 u1 e1 o1  a i u e o)
  (ANY b ch d f g j k l ll m n ny p r rr s t th x - a1 i1 u1 e1 o1  a i u e o)
  (notNS b ch d f g j k l ll m ny p r rr t th x )
  (iu i u )
  (aeo a e o)
  )
 (
  ;; consonants to themselves
  ( [ b ] = b )
  ( [ d ] = d )
  ( [ ch ] = ch )
  ( [ f ] = f )
  ( [ g ] = g )
  ( [ j ] = j )
  ( [ k ] = k )
  ( [ l ] = l )
  ( [ ll ] = ll )
  ( [ m ] = m )
  ( [ n ] = n )
  ( [ ny ] = ny )
  ( [ p ] = p )
  ( [ r ] = r )
  ( [ rr ] = rr )
  ( [ s ] = s )
  ( [ t ] = t )
  ( [ th ] = th )
  ( [ x ] = x )
  ( [ - ] = - )
  ;; stressed vowels to themselves
  ( [ a1 ] = a1 )
  ( [ i1 ] = i1 )
  ( [ u1 ] = u1 )
  ( [ e1 ] = e1 )
  ( [ o1 ] = o1 )

  ( V1 ANY * [ a ] = a )
  ( V1 ANY * [ e ] = e )
  ( V1 ANY * [ i ] = i )
  ( V1 ANY * [ o ] = o )
  ( V1 ANY * [ u ] = u )
  ( [ a ] ANY * V1 = a )
  ( [ e ] ANY * V1 = e )
  ( [ i ] ANY * V1 = i )
  ( [ o ] ANY * V1 = o )
  ( [ u ] ANY * V1 = u )
  
  ;; We'll only get here when the vowel is in an unstressed word
  ;; two more syllables so don't worry about it yet
  ( [ a ] VC * -  VC * - = a )
  ( [ e ] VC * -  VC * - = e )
  ( [ i ] VC * -  VC * - = i )
  ( [ o ] VC * -  VC * - = o )
  ( [ u ] VC * -  VC * - = u )

  ( [ a ] ANY * - VC * aeo i # = a )
  ( [ e ] ANY * - VC * aeo i # = e )
  ( [ i ] ANY * - VC * aeo i # = i )
  ( [ o ] ANY * - VC * aeo i # = o )
  ( [ u ] ANY * - VC * aeo i # = u )

  ( [ a ] VC * - VC * VNS # = a1 )
  ( [ e ] VC * - VC * VNS # = e1 )
  ( [ o ] VC * - VC * VNS # = o1 )
  ( [ i ] aeo C * - VC * VNS # = i )
  ( [ u ] aeo C * - VC * VNS # = u )
  ( aeo [ i ] C * - VC * VNS # = i )
  ( aeo [ u ] C * - VC * VNS # = u )
  ( [ u ] C * - VC * VNS # = u1 )
  ( [ i ] C * - VC * VNS # = i1 )

  ( [ a ] i # = a1 )
  ( [ e ] i # = e1 )
  ( [ o ] i # = o1 )

  ;; stress on previous syllable
  ( - VC * [ a ] VC * VNS # = a )
  ( - VC * [ e ] VC * VNS # = e )
  ( - VC * [ i ] VC * VNS # = i )
  ( - VC * [ o ] VC * VNS # = o )
  ( - VC * [ u ] VC * VNS # = u )
  ( - VC * [ a ] # = a )
  ( - VC * [ e ] # = e )
  ( - VC * [ i ] # = i )
  ( - VC * [ o ] # = o )
  ( - VC * [ u ] # = u )

  ;; stress on final syllable
  ( [ a ] VC * # = a1 )
  ( [ e ] VC * # = e1 )
  ( [ o ] VC * # = o1 )
  ( aeo [ i ] VC * # = i )
  ( aeo [ u ] VC * # = u )
  ( [ i ] aeo VC * # = i )
  ( [ u ] aeo VC * # = u )
  ( [ i ] VC * # = i1 )
  ( [ u ] VC * # = u1 )

  ( [ a ] = a )
  ( [ e ] = e )
  ( [ i ] = i )
  ( [ o ] = o )
  ( [ u ] = u )
  
))

(lts.ruleset
 ;; reduce i and u in diphthongs to u0 i0
 spanish_weak_vowels
 (
  (aeo a e o a1 e1 o1 i1 u1 )
  )
 (
  ;; consonants to themselves
  ( [ b ] = b )
  ( [ d ] = d )
  ( [ ch ] = ch )
  ( [ f ] = f )
  ( [ g ] = g )
  ( [ j ] = j )
  ( [ k ] = k )
  ( [ l ] = l )
  ( [ ll ] = ll )
  ( [ m ] = m )
  ( [ n ] = n )
  ( [ ny ] = ny )
  ( [ p ] = p )
  ( [ r ] = r )
  ( [ rr ] = rr )
  ( [ s ] = s )
  ( [ t ] = t )
  ( [ th ] = th )
  ( [ x ] = x )
  ( [ - ] = - )
  ;; stressed vowels to themselves
  ( [ a1 ] = a1 )
  ( [ i1 ] = i1 )
  ( [ u1 ] = u1 )
  ( [ e1 ] = e1 )
  ( [ o1 ] = o1 )

  ( aeo [ i ] = i0 )
  ( [ i ] aeo = i0 )
  ( aeo [ u ] = u0 )
  ( [ u ] aeo = u0 )

  ( [ a ] = a )
  ( [ i ] = i )
  ( [ u ] = u )
  ( [ e ] = e )
  ( [ o ] = o )
))

;;;
;;;  Function to turn word into lexical entry for Spanish
;;;
;;;  First uses lts to get phoneme string then assigns stress if
;;;  there is no stress and then uses a third set of rules to
;;;  mark syllable boundaries, finally converting that list
;;;  to the bracket structure festival requires
;;;

(define (spanish_lts word features)
  "(spanish_lts WORD FEATURES)
Using various letter to sound rules build a Spanish pronunciation of 
WORD."
  (let (phones syl stresssyl dword weakened)
    (if (lts.in.alphabet word 'spanish_downcase)
	(set! dword (spanish_downcase word))
	(set! dword (spanish_downcase "equis")))
    (set! phones (lts.apply dword 'spanish))
    (set! syl (lts.apply phones 'spanish_syl))
    (if (spanish_is_a_content_word 
	 (apply string-append dword)
	 spanish_guess_pos)
	(set! stresssyl (lts.apply syl 'spanish.stress))
	(set! stresssyl syl))  ;; function words leave as is
    (set! weakened (lts.apply stresssyl 'spanish_weak_vowels))
    (list word
	  nil
	  (spanish_tosyl_brackets weakened))))

(define (spanish_is_a_content_word word poslist)
  "(spanish_is_a_content_word WORD POSLIST)
Check explicit list of function words and return t if this is not
listed."
  (cond
   ((null poslist)
    t)
   ((member_string word (cdr (car poslist)))
    nil)
   (t
    (spanish_is_a_content_word word (cdr poslist)))))

(define (spanish_downcase word)
  "(spanish_downcase WORD)
Downs case word by letter to sound rules becuase or accented form
this can't use the builtin downcase function."
  (lts.apply word 'spanish_downcase))

(define (spanish_tosyl_brackets phones)
   "(spanish_tosyl_brackets phones)
Takes a list of phones containing - as syllable boundary.  Construct the
Festival bracket structure."
 (let ((syl nil) (syls nil) (p phones) (stress 0))
    (while p
     (set! syl nil)
     (set! stress 0)
     (while (and p (not (eq? '- (car p))))
       (set! syl (cons (car p) syl))
       (if (string-matches (car p) ".*1")
           (set! stress 1))
       (set! p (cdr p)))
     (set! p (cdr p))  ;; skip the syllable separator
     (set! syls (cons (list (reverse syl) stress) syls)))
    (reverse syls)))   

(provide 'spanlex)