CurryInfo: xml-3.0.0 / XmlConv

--- Provides type-based combinators to construct XML converters.
--- Arbitrary XML data can be represented as algebraic datatypes and vice versa.
--- See <a href="http://www-ps.informatik.uni-kiel.de/~sebf/projects/xmlconv/">
--- here</a> for a description of this library.
---
--- @author Sebastian Fischer (with changes by Michael Hanus)
--- @version February 2015

XmlConv

! aBool aChar aFloat aInt aString adapt attr char eBool eChar eEmpty eFloat eInt eOpt eRep eRepSeq1 eRepSeq2 eRepSeq3 eRepSeq4 eRepSeq5 eRepSeq6 eSeq1 eSeq2 eSeq3 eSeq4 eSeq5 eSeq6 eString element empty float int opt rep repSeq1 repSeq2 repSeq3 repSeq4 repSeq5 repSeq6 seq1 seq2 seq3 seq4 seq5 seq6 string xmlRead xmlReads xmlShow xmlShows

{-# OPTIONS_CYMAKE -Wno-incomplete-patterns -Wno-overlapping #-}

module XmlConv (

  -- converter types
  XElemConv, XAttrConv, XPrimConv, XOptConv, XRepConv,

  -- Reads and Shows types for XML trees
  XmlReads, XmlShows,

  -- read and show functions
  xmlRead, xmlShow, xmlReads, xmlShows,

  -- converter for primitive values
  int, float, char, string,

  -- combinators for complex XML data
  (!), element, empty, attr, adapt, opt, rep,

  -- attribute converter for primitive values and booleans
  aInt, aFloat, aChar, aString, aBool,

  -- element converter
  eInt, eFloat, eChar, eString, eBool, eEmpty, eOpt, eRep,

  -- converter for sequences
  seq1, seq2, seq3, seq4, seq5, seq6,

  -- converter for repeated sequences
  repSeq1, repSeq2, repSeq3, repSeq4, repSeq5, repSeq6,

  -- element converter for sequences
  eSeq1, eSeq2, eSeq3, eSeq4, eSeq5, eSeq6,

  -- element converter for repeated sequences
  eRepSeq1, eRepSeq2, eRepSeq3, eRepSeq4, eRepSeq5, eRepSeq6

  ) where

import XML

infixr 0 !
infixl 1 />=

--- Phantom type for XML data that may be part of a repetition
data Repeatable = Repeatable

--- Phantom type for XML data that must not be part of a repetition
data NotRepeatable = NotRepeatable

--- Phantom type for single elements
data Elem = Elem

--- Phantom type for primitive values, multiple elements and/or attributes
data NoElem = NoElem

type Attrs = [(String,String)]
type Childs = (Attrs,[XmlExp])

--- Type of functions that consume some XML data to compute a result
type XmlReads a = Childs -> (a,Childs)

--- Type of functions that extend XML data corresponding to a given value
type XmlShows a = a -> Childs -> Childs

data XmlConv _ _ a = Conv (XmlReads a) (XmlShows a)
type ValConv a = (String -> a,a -> String)

--- Type of converters for XML elements
type XElemConv a = XmlConv Repeatable Elem a

--- Type of converters for attributes
type XAttrConv a = XmlConv NotRepeatable NoElem a

--- Type of converters for primitive values
type XPrimConv a = XmlConv NotRepeatable NoElem a

--- Type of converters for optional values
type XOptConv a = XmlConv NotRepeatable NoElem a

--- Type of converters for repetitions
type XRepConv a = XmlConv NotRepeatable NoElem a

--- Type of converters for sequences
type XSeqConv a = XmlConv NotRepeatable NoElem a

-- Monadic bind for XML parser
(/>=) :: XmlReads a -> (a -> XmlReads b) -> XmlReads b
rd />= f = \childs -> case rd childs of (a,childs') -> f a childs'

-- Monadic return for XML parser
ret :: a -> XmlReads a
ret x y = (x,y)

--- Takes an XML converter and returns a function that consumes XML data
--- and returns the remaining data along with the result.
---
--- @param conv XML converter
--- @return XmlReads function
xmlReads :: XmlConv _ _ a -> XmlReads a
xmlReads (Conv rd _) = rd

--- Takes an XML converter and returns a function that extends XML data
--- with the representation of a given value.
---
--- @param conv XML converter
--- @return XmlShows function
xmlShows :: XmlConv _ _ a -> XmlShows a
xmlShows (Conv _ sh) = sh

--- Takes an XML converter and an XML expression and returns a
--- corresponding Curry value.
---
--- @param conv XML converter
--- @return XML read function
xmlRead :: XmlConv _ Elem a -> XmlExp -> a
xmlRead xa x = a
 where
  (a,([],[])) = xmlReads xa ([],[x])

--- Takes an XML converter and a value and returns a corresponding
--- XML expression.
---
--- @param conv XML converter
--- @return XML show function
xmlShow :: XmlConv _ Elem a -> a -> XmlExp
xmlShow xa a = x
 where
  ([],[x]) = xmlShows xa a ([],[])

int_ :: ValConv Int
int_ = (read,show)

float_ :: ValConv Float
float_ = (read,show)

char_ :: ValConv Char
char_ = (head,(:[]))

string_ :: ValConv String
string_ = (id,id)

bool_ :: String -> String -> ValConv Bool
bool_ true false = (readBool,showBool)
 where
  fromJust (Just x) = x
  readBool s = fromJust (lookup s [(true,True),(false,False)])
  showBool b = if b then true else false

val_ :: ValConv a -> XPrimConv a
val_ (rda,sha) = Conv rd sh
 where
  rd childs = (rda a,(attrs,elems))
   where
    (attrs,XText a : elems) = childs

  sh a childs = (attrs,XText (sha a) : elems)
   where
    (attrs,elems) = childs

--- Creates an XML converter for integer values. Integer values must not be
--- used in repetitions and do not represent XML elements.
---
--- @return Int converter
int :: XPrimConv Int
int = val_ int_

--- Creates an XML converter for float values. Float values must not be
--- used in repetitions and do not represent XML elements.
---
--- @return Float converter
float :: XPrimConv Float
float = val_ float_

--- Creates an XML converter for character values. Character values must not be
--- used in repetitions and do not represent XML elements.
---
--- @return Char converter
char :: XPrimConv Char
char = val_ char_

--- Creates an XML converter for string values. String values must not be
--- used in repetitions and do not represent XML elements.
---
--- @return String converter
string :: XPrimConv String
string = Conv rd sh
 where
  rd childs = ("",childs)
            ? case elems of XText s : elems' -> (s,(attrs,elems'))
   where
    (attrs,elems) = childs

  sh "" childs = childs
  sh s@(_:_) childs = (attrs,XText s : elems)
   where
    (attrs,elems) = childs

--- Parallel composition of XML converters.
---
--- @return Nondeterministic choice of XML converters
(!) :: XmlConv rep elem a -> XmlConv rep elem a -> XmlConv rep elem a
(Conv rd1 sh1) ! (Conv rd2 sh2) = Conv rd sh
 where
  rd childs = rd1 childs ? rd2 childs
  sh x = sh1 x ? sh2 x

--- Takes an arbitrary XML converter and returns a converter representing
--- an XML element that contains the corresponding data. XML elements may be
--- used in repetitions.
---
--- @param name Tag name of the XML element
--- @param conv XML converter for the childs of the XML element
--- @return XML converter representing an XML element
element :: String -> XmlConv _ _ a -> XElemConv a
element name xa = Conv rd sh
 where
  rd childs
    | myName==name
      = case xmlReads xa (myAttrs,myElems) of
         (a,([],[])) -> (a,(attrs,elems))
   where
    (attrs,XElem myName myAttrs myElems : elems) = childs

  sh a childs
    = case xmlShows xa a ([],[]) of
        (myAttrs,myElems) -> (attrs,XElem name myAttrs myElems : elems)
   where
    (attrs,elems) = childs

--- Takes a value and returns an XML converter for this value which is not
--- represented as XML data. Empty XML data must not be used in repetitions
--- and does not represent an XML element.
---
--- @param val Value without an XML representation
--- @return Empty XML converter
empty :: Data a => a -> XPrimConv a
empty val = Conv rd sh
 where
  rd = ret val
  sh v childs | v=:=val = childs

--- Takes a name and string conversion functions and returns an XML converter
--- that represents an attribute. Attributes must not be used in repetitions
--- and do not represent an XML element.
---
--- @param name Attribute name
--- @param readShow functions that convert between values and strings
--- @return Attribute converter
attr :: String -> ValConv a -> XAttrConv a
attr name (rda,sha) = Conv rd sh
 where
  rd childs = (rda value,(attrs',elems))
   where
    (attrs,elems) = childs
    ((_,value),attrs') = exposeBy ((name==) . fst) attrs

  sh a childs = ((name,sha a) : attrs,elems)
   where
    (attrs,elems) = childs

-- Fetch a list element that satisfies a given predicate.
exposeBy :: (a -> Bool) -> [a] -> (a,[a])
exposeBy p (x:xs) = if p x then (x,xs) else (y,x:ys)
 where
  (y,ys) = exposeBy p xs

--- Converts between arbitrary XML converters for different types.
---
--- @param a2b_b2a functions that convert between values of types a and b
--- @param conv XML converter for type a
--- @return XML converter for type b
adapt :: (a -> b,b -> a) -> XmlConv rep e a -> XmlConv rep e b
adapt (a2b,b2a) (Conv rda sha) = Conv rd sh
 where
  rd = rda />= ret . a2b
  sh = sha . b2a

--- Creates a converter for arbitrary optional XML data. Optional XML data
--- must not be used in repetitions and does not represent an XML element.
---
--- @param conv XML converter
--- @return XML converter for optional data represented by the given converter
opt :: XmlConv _ _ a -> XOptConv (Maybe a)
opt xa = Conv rd sh
 where
  rd childs = ret Nothing childs
            ? (xmlReads xa />= ret . Just) childs

  sh Nothing = id
  sh (Just a) = xmlShows xa a

--- Takes an XML converter representing repeatable data and returns an
--- XML converter that represents repetitions of this data. Repetitions
--- must not be used in other repetitions and do not represent XML elements.
---
--- @param conv XML converter representing repeatable data
--- @return XML converter representing repetitions
rep :: XmlConv Repeatable _ a -> XRepConv [a]
rep xa = Conv rd sh
 where
  rd childs = ret [] childs
            ? ( xmlReads xa />= \x ->
                rd />= \xs ->
                ret (x:xs)) childs

  sh = foldr (.) id . map (xmlShows xa)

--- Creates an XML converter for integer attributes. Integer attributes
--- must not be used in repetitions and do not represent XML elements.
---
--- @param name Attribute name
--- @return Int attribute converter
aInt :: String -> XAttrConv Int
aInt name = attr name int_

--- Creates an XML converter for float attributes. Float attributes
--- must not be used in repetitions and do not represent XML elements.
---
--- @param name Attribute name
--- @return Float attribute converter
aFloat :: String -> XAttrConv Float
aFloat name = attr name float_

--- Creates an XML converter for character attributes. Character attributes
--- must not be used in repetitions and do not represent XML elements.
---
--- @param name Attribute name
--- @return Char attribute converter
aChar :: String -> XAttrConv Char
aChar name = attr name char_

--- Creates an XML converter for string attributes. String attributes
--- must not be used in repetitions and do not represent XML elements.
---
--- @param name Attribute name
--- @return String attribute converter
aString :: String -> XAttrConv String
aString name = attr name string_

--- Creates an XML converter for boolean attributes. Boolean attributes
--- must not be used in repetitions and do not represent XML elements.
---
--- @param name Attribute name
--- @param true String representing True
--- @param false String representing False
--- @return Bool attribute converter
aBool :: String -> String -> String -> XAttrConv Bool
aBool name true false = attr name (bool_ true false)

--- Creates an XML converter for integer elements. Integer elements may be
--- used in repetitions.
---
--- @param name Tag name of the XML element containing the integer value
--- @return Int element converter
eInt :: String -> XElemConv Int
eInt name = element name int

--- Creates an XML converter for float elements. Float elements may be
--- used in repetitions.
---
--- @param name Tag name of the XML element containing the float value
--- @return Float element converter
eFloat :: String -> XElemConv Float
eFloat name = element name float

--- Creates an XML converter for character elements. Character elements may be
--- used in repetitions.
---
--- @param name Tag name of the XML element containing the character value
--- @return Char element converter
eChar :: String -> XElemConv Char
eChar name = element name char

--- Creates an XML converter for string elements. String elements may be
--- used in repetitions.
---
--- @param name Tag name of the XML element containing the string value
--- @return String element converter
eString :: String -> XElemConv String
eString name = element name string

--- Creates an XML converter for boolean elements. Boolean elements may be
--- used in repetitions.
---
--- @param true Tag name of the XML element representing True
--- @param false Tag name of the XML element representing False
--- @return Bool element converter
eBool :: String -> String -> XElemConv Bool
eBool true false = eEmpty true True ! eEmpty false False

--- Takes a name and a value and creates an empty XML element that represents
--- the given value. The created element may be used in repetitions.
---
--- @param name Tag name of the empty element
--- @param val Value represented by the empty element
--- @return XML converter representing an empty XML element
eEmpty :: Data a => String -> a -> XElemConv a
eEmpty name a = element name (empty a)

--- Creates an XML converter that represents an element containing
--- optional XML data. The created element may be used in repetitions.
---
--- @param name Tag name of the element containing optional XML data
--- @return XML converter for an element enclosing optional XML data
eOpt :: String -> XmlConv _ _ a -> XElemConv (Maybe a)
eOpt name xa = element name (opt xa)

--- Creates an XML converter that represents an element containing
--- repeated XML data. The created element may be used in repetitions.
---
--- @param name Tag name of the element containing repeated XML data
--- @return XML converter for an element enclosing repeated XML data
eRep :: String -> XmlConv Repeatable _ a -> XElemConv [a]
eRep name xa = element name (rep xa)

--- Creates an XML converter representing a sequence of arbitrary XML data.
--- The sequence must not be used in repetitions and does not represent an
--- XML element.
---
--- @param f Invertable function (constructor) that combines the sequence
--- @param conv(s) XML converter for the data contained in the sequence
--- @return XML converter representing a sequence
seq1 :: (Data a, Data b) => (a -> b) -> XmlConv rep _ a
     -> XmlConv rep NoElem b
seq1 cons xa = Conv rd sh
 where
  rd = xmlReads xa />= ret . cons
  sh arg | cons a =:<= arg = xmlShows xa a where a free

--- Creates an XML converter that represents a repetition of a sequence
--- of repeatable XML data. The repetition may be used in other
--- repetitions but does not represent an XML element. This combinator is
--- provided because converters for repeatable sequences cannot be
--- constructed by the seq combinators.
---
--- @param f Invertable function (constructor) that combines the sequence
--- @param conv(s) XML converter for the data contained in the sequence
--- @return XML converter representing a repetition of a sequence
repSeq1 :: (Data a, Data b) => (a -> b) -> XmlConv Repeatable _ a
        -> XRepConv [b]
repSeq1 cons xa = rep (seq1 cons xa)

--- Creates an XML converter for compound values represented as an
--- XML element with children that correspond to the values components.
--- The element can be used in repetitions.
---
--- @param name Tag name of the element
--- @param cons constructor of the compound value
--- @param conv(s) XML converter for the components
--- @return XML element converter for a compound value
eSeq1 :: (Data a, Data b) => String -> (a -> b) -> XmlConv _ _ a -> XElemConv b
eSeq1 name cons xa = element name (seq1 cons xa)

--- Creates an XML converter for repetitions of sequences represented as an
--- XML element that can be used in repetitions.
---
--- @param name Tag name of the element
--- @param cons constructor of the sequence
--- @param conv(s) XML converter for the components
--- @return XML element converter for a repeated sequence
eRepSeq1 :: (Data a, Data b) => String -> (a -> b)
         -> XmlConv Repeatable _ a -> XElemConv [b]
eRepSeq1 name cons xa = element name (repSeq1 cons xa)

seq2_ :: (Data a, Data b, Data c) => (a -> b -> c)
      -> XmlConv _ _ a -> XmlConv _ _ b
      -> XmlConv _ NoElem c
seq2_ cons xa xb = Conv rd sh
 where
  rd = xmlReads xa />= \a ->
       xmlReads xb />= \b ->
       ret (cons a b)
  sh arg | cons a b =:<= arg = xmlShows xa a . xmlShows xb b  where a,b free


--- Creates an XML converter representing a sequence of arbitrary XML data.
--- The sequence must not be used in repetitions and does not represent an
--- XML element.
---
--- @param f Invertable function (constructor) that combines the sequence
--- @param conv(s) XML converter for the data contained in the sequence
--- @return XML converter representing a sequence
seq2 :: (Data a, Data b, Data c) => (a -> b -> c)
     -> XmlConv _ _ a -> XmlConv _ _ b
     -> XSeqConv c
seq2 = seq2_

--- Creates an XML converter that represents a repetition of a sequence
--- of repeatable XML data. The repetition may be used in other
--- repetitions and does not represent an XML element. This combinator is
--- provided because converters for repeatable sequences cannot be
--- constructed by the seq combinators.
---
--- @param f Invertable function (constructor) that combines the sequence
--- @param conv(s) XML converter for the data contained in the sequence
--- @return XML converter representing a repetition of a sequence
repSeq2 :: (Data a, Data b, Data c) => (a -> b -> c)
        -> XmlConv Repeatable _ a -> XmlConv Repeatable _ b
        -> XRepConv [c]
repSeq2 cons xa xb = rep (seq2_ cons xa xb)

--- Creates an XML converter for compound values represented as an
--- XML element with children that correspond to the values components.
--- The element can be used in repetitions.
---
--- @param name Tag name of the element
--- @param cons constructor of the compound value
--- @param conv(s) XML converter for the components
--- @return XML element converter for a compound value
eSeq2 :: (Data a, Data b, Data c) => String -> (a -> b -> c)
      -> XmlConv _ _ a -> XmlConv _ _ b
      -> XElemConv c
eSeq2 name cons xa xb = element name (seq2 cons xa xb)

--- Creates an XML converter for repetitions of sequences represented as an
--- XML element that can be used in repetitions.
---
--- @param name Tag name of the element
--- @param cons constructor of the sequence
--- @param conv(s) XML converter for the components
--- @return XML element converter for a repeated sequence
eRepSeq2 :: (Data a, Data b, Data c) => String -> (a -> b -> c)
         -> XmlConv Repeatable _ a -> XmlConv Repeatable _ b
         -> XElemConv [c]
eRepSeq2 name cons xa xb = element name (repSeq2 cons xa xb)

seq3_ :: (Data a, Data b, Data c, Data d) => (a -> b -> c -> d)
      -> XmlConv _ _ a -> XmlConv _ _ b -> XmlConv _ _ c
      -> XmlConv _ NoElem d
seq3_ cons xa xb xc = Conv rd sh
 where
  rd = xmlReads xa />= \a ->
       xmlReads xb />= \b ->
       xmlReads xc />= \c ->
       ret (cons a b c)
  sh arg | (cons a b c) =:<= arg = xmlShows xa a . xmlShows xb b . xmlShows xc c
    where a,b,c free

--- Creates an XML converter representing a sequence of arbitrary XML data.
--- The sequence must not be used in repetitions and does not represent an
--- XML element.
---
--- @param f Invertable function (constructor) that combines the sequence
--- @param conv(s) XML converter for the data contained in the sequence
--- @return XML converter representing a sequence
seq3 :: (Data a, Data b, Data c, Data d) => (a -> b -> c -> d)
     -> XmlConv _ _ a -> XmlConv _ _ b -> XmlConv _ _ c
     -> XSeqConv d
seq3 = seq3_

--- Creates an XML converter that represents a repetition of a sequence
--- of repeatable XML data. The repetition may be used in other
--- repetitions and does not represent an XML element. This combinator is
--- provided because converters for repeatable sequences cannot be
--- constructed by the seq combinators.
---
--- @param f Invertable function (constructor) that combines the sequence
--- @param conv(s) XML converter for the data contained in the sequence
--- @return XML converter representing a repetition of a sequence
repSeq3 :: (Data a, Data b, Data c, Data d) => (a -> b -> c -> d)
        -> XmlConv Repeatable _ a -> XmlConv Repeatable _ b
        -> XmlConv Repeatable _ c
        -> XRepConv [d]
repSeq3 cons xa xb xc = rep (seq3_ cons xa xb xc)

--- Creates an XML converter for compound values represented as an
--- XML element with children that correspond to the values components.
--- The element can be used in repetitions.
---
--- @param name Tag name of the element
--- @param cons constructor of the compound value
--- @param conv(s) XML converter for the components
--- @return XML element converter for a compound value
eSeq3 :: (Data a, Data b, Data c, Data d) => String -> (a -> b -> c -> d)
      -> XmlConv _ _ a -> XmlConv _ _ b -> XmlConv _ _ c
      -> XElemConv d
eSeq3 name cons xa xb xc = element name (seq3 cons xa xb xc)

--- Creates an XML converter for repetitions of sequences represented as an
--- XML element that can be used in repetitions.
---
--- @param name Tag name of the element
--- @param cons constructor of the sequence
--- @param conv(s) XML converter for the components
--- @return XML element converter for a repeated sequence
eRepSeq3 :: (Data a, Data b, Data c, Data d) => String -> (a -> b -> c -> d)
         -> XmlConv Repeatable _ a -> XmlConv Repeatable _ b
         -> XmlConv Repeatable _ c
         -> XElemConv [d]
eRepSeq3 name cons xa xb xc = element name (repSeq3 cons xa xb xc)

seq4_ :: (Data a, Data b, Data c, Data d, Data e) => (a -> b -> c -> d -> e)
      -> XmlConv _ _ a -> XmlConv _ _ b -> XmlConv _ _ c -> XmlConv _ _ d
      -> XmlConv _ NoElem e
seq4_ cons xa xb xc xd = Conv rd sh
 where
  rd = xmlReads xa />= \a ->
       xmlReads xb />= \b ->
       xmlReads xc />= \c ->
       xmlReads xd />= \d ->
       ret (cons a b c d)
  sh arg | (cons a b c d) =:<= arg
         = xmlShows xa a . xmlShows xb b . xmlShows xc c
                         . xmlShows xd d  where a,b,c,d free

--- Creates an XML converter representing a sequence of arbitrary XML data.
--- The sequence must not be used in repetitions and does not represent an
--- XML element.
---
--- @param f Invertable function (constructor) that combines the sequence
--- @param conv(s) XML converter for the data contained in the sequence
--- @return XML converter representing a sequence
seq4 :: (Data a, Data b, Data c, Data d, Data e) => (a -> b -> c -> d -> e)
     -> XmlConv _ _ a -> XmlConv _ _ b -> XmlConv _ _ c -> XmlConv _ _ d
     -> XSeqConv e
seq4 = seq4_

--- Creates an XML converter that represents a repetition of a sequence
--- of repeatable XML data. The repetition may be used in other
--- repetitions and does not represent an XML element. This combinator is
--- provided because converters for repeatable sequences cannot be
--- constructed by the seq combinators.
---
--- @param f Invertable function (constructor) that combines the sequence
--- @param conv(s) XML converter for the data contained in the sequence
--- @return XML converter representing a repetition of a sequence
repSeq4 :: (Data a, Data b, Data c, Data d, Data e) => (a -> b -> c -> d -> e)
        -> XmlConv Repeatable _ a -> XmlConv Repeatable _ b
        -> XmlConv Repeatable _ c -> XmlConv Repeatable _ d
        -> XRepConv [e]
repSeq4 cons xa xb xc xd = rep (seq4_ cons xa xb xc xd)

--- Creates an XML converter for compound values represented as an
--- XML element with children that correspond to the values components.
--- The element can be used in repetitions.
---
--- @param name Tag name of the element
--- @param cons constructor of the compound value
--- @param conv(s) XML converter for the components
--- @return XML element converter for a compound value
eSeq4 :: (Data a, Data b, Data c, Data d, Data e) => String -> (a -> b -> c -> d -> e)
      -> XmlConv _ _ a -> XmlConv _ _ b -> XmlConv _ _ c -> XmlConv _ _ d
      -> XElemConv e
eSeq4 name cons xa xb xc xd = element name (seq4 cons xa xb xc xd)

--- Creates an XML converter for repetitions of sequences represented as an
--- XML element that can be used in repetitions.
---
--- @param name Tag name of the element
--- @param cons constructor of the sequence
--- @param conv(s) XML converter for the components
--- @return XML element converter for a repeated sequence
eRepSeq4 :: (Data a, Data b, Data c, Data d, Data e) => String -> (a -> b -> c -> d -> e)
         -> XmlConv Repeatable _ a -> XmlConv Repeatable _ b
         -> XmlConv Repeatable _ c -> XmlConv Repeatable _ d
         -> XElemConv [e]
eRepSeq4 name cons xa xb xc xd = element name (repSeq4 cons xa xb xc xd)

seq5_ :: (Data a, Data b, Data c, Data d, Data e, Data f) =>
         (a -> b -> c -> d -> e -> f)
      -> XmlConv _ _ a -> XmlConv _ _ b -> XmlConv _ _ c -> XmlConv _ _ d
      -> XmlConv _ _ e
      -> XmlConv _ NoElem f
seq5_ cons xa xb xc xd xe = Conv rd sh
 where
  rd = xmlReads xa />= \a ->
       xmlReads xb />= \b ->
       xmlReads xc />= \c ->
       xmlReads xd />= \d ->
       xmlReads xe />= \e ->
       ret (cons a b c d e)
  sh arg | (cons a b c d e) =:<= arg
         = xmlShows xa a . xmlShows xb b . xmlShows xc c
                         . xmlShows xd d . xmlShows xe e  where a,b,c,d,e free


--- Creates an XML converter representing a sequence of arbitrary XML data.
--- The sequence must not be used in repetitions and does not represent an
--- XML element.
---
--- @param f Invertable function (constructor) that combines the sequence
--- @param conv(s) XML converter for the data contained in the sequence
--- @return XML converter representing a sequence
seq5 :: (Data a, Data b, Data c, Data d, Data e, Data f) =>
        (a -> b -> c -> d -> e -> f)
     -> XmlConv _ _ a -> XmlConv _ _ b -> XmlConv _ _ c -> XmlConv _ _ d
     -> XmlConv _ _ e
     -> XSeqConv f
seq5 = seq5_

--- Creates an XML converter that represents a repetition of a sequence
--- of repeatable XML data. The repetition may be used in other
--- repetitions and does not represent an XML element. This combinator is
--- provided because converters for repeatable sequences cannot be
--- constructed by the seq combinators.
---
--- @param f Invertable function (constructor) that combines the sequence
--- @param conv(s) XML converter for the data contained in the sequence
--- @return XML converter representing a repetition of a sequence
repSeq5 :: (Data a, Data b, Data c, Data d, Data e, Data f) =>
           (a -> b -> c -> d -> e -> f)
        -> XmlConv Repeatable _ a -> XmlConv Repeatable _ b
        -> XmlConv Repeatable _ c -> XmlConv Repeatable _ d
        -> XmlConv Repeatable _ e
        -> XRepConv [f]
repSeq5 cons xa xb xc xd xe = rep (seq5_ cons xa xb xc xd xe)

--- Creates an XML converter for compound values represented as an
--- XML element with children that correspond to the values components.
--- The element can be used in repetitions.
---
--- @param name Tag name of the element
--- @param cons constructor of the compound value
--- @param conv(s) XML converter for the components
--- @return XML element converter for a compound value
eSeq5 :: (Data a, Data b, Data c, Data d, Data e, Data f) =>
         String -> (a -> b -> c -> d -> e -> f)
      -> XmlConv _ _ a -> XmlConv _ _ b -> XmlConv _ _ c -> XmlConv _ _ d
      -> XmlConv _ _ e
      -> XElemConv f
eSeq5 name cons xa xb xc xd xe = element name (seq5 cons xa xb xc xd xe)

--- Creates an XML converter for repetitions of sequences represented as an
--- XML element that can be used in repetitions.
---
--- @param name Tag name of the element
--- @param cons constructor of the sequence
--- @param conv(s) XML converter for the components
--- @return XML element converter for a repeated sequence
eRepSeq5 :: (Data a, Data b, Data c, Data d, Data e, Data f) =>
            String -> (a -> b -> c -> d -> e -> f)
         -> XmlConv Repeatable _ a -> XmlConv Repeatable _ b
         -> XmlConv Repeatable _ c -> XmlConv Repeatable _ d
         -> XmlConv Repeatable _ e
         -> XElemConv [f]
eRepSeq5 name cons xa xb xc xd xe = element name (repSeq5 cons xa xb xc xd xe)

seq6_ :: (Data a, Data b, Data c, Data d, Data e, Data f, Data g) =>
         (a -> b -> c -> d -> e -> f -> g)
      -> XmlConv _ _ a -> XmlConv _ _ b -> XmlConv _ _ c -> XmlConv _ _ d
      -> XmlConv _ _ e -> XmlConv _ _ f
      -> XmlConv _ NoElem g
seq6_ cons xa xb xc xd xe xf = Conv rd sh
 where
  rd = xmlReads xa />= \a ->
       xmlReads xb />= \b ->
       xmlReads xc />= \c ->
       xmlReads xd />= \d ->
       xmlReads xe />= \e ->
       xmlReads xf />= \f ->
       ret (cons a b c d e f)
  sh arg | (cons a b c d e f) =:<= arg
         = xmlShows xa a . xmlShows xb b . xmlShows xc c
                         . xmlShows xd d . xmlShows xe e . xmlShows xf f
                         where a,b,c,d,e,f free

--- Creates an XML converter representing a sequence of arbitrary XML data.
--- The sequence must not be used in repetitions and does not represent an
--- XML element.
---
--- @param f Invertable function (constructor) that combines the sequence
--- @param conv(s) XML converter for the data contained in the sequence
--- @return XML converter representing a sequence
seq6 :: (Data a, Data b, Data c, Data d, Data e, Data f, Data g) =>
        (a -> b -> c -> d -> e -> f -> g)
     -> XmlConv _ _ a -> XmlConv _ _ b -> XmlConv _ _ c -> XmlConv _ _ d
     -> XmlConv _ _ e -> XmlConv _ _ f
     -> XSeqConv g
seq6 = seq6_

--- Creates an XML converter that represents a repetition of a sequence
--- of repeatable XML data. The repetition may be used in other
--- repetitions and does not represent an XML element. This combinator is
--- provided because converters for repeatable sequences cannot be
--- constructed by the seq combinators.
---
--- @param f Invertable function (constructor) that combines the sequence
--- @param conv(s) XML converter for the data contained in the sequence
--- @return XML converter representing a repetition of a sequence
repSeq6 :: (Data a, Data b, Data c, Data d, Data e, Data f, Data g) =>
           (a -> b -> c -> d -> e -> f -> g)
        -> XmlConv Repeatable _ a -> XmlConv Repeatable _ b
        -> XmlConv Repeatable _ c -> XmlConv Repeatable _ d
        -> XmlConv Repeatable _ e -> XmlConv Repeatable _ f
        -> XRepConv [g]
repSeq6 cons xa xb xc xd xe xf = rep (seq6_ cons xa xb xc xd xe xf)

--- Creates an XML converter for compound values represented as an
--- XML element with children that correspond to the values components.
--- The element can be used in repetitions.
---
--- @param name Tag name of the element
--- @param cons constructor of the compound value
--- @param conv(s) XML converter for the components
--- @return XML element converter for a compound value
eSeq6 :: (Data a, Data b, Data c, Data d, Data e, Data f, Data g) =>
         String -> (a -> b -> c -> d -> e -> f -> g)
      -> XmlConv _ _ a -> XmlConv _ _ b -> XmlConv _ _ c -> XmlConv _ _ d
      -> XmlConv _ _ e -> XmlConv _ _ f
      -> XElemConv g
eSeq6 name cons xa xb xc xd xe xf = element name (seq6 cons xa xb xc xd xe xf)

--- Creates an XML converter for repetitions of sequences represented as an
--- XML element that can be used in repetitions.
---
--- @param name Tag name of the element
--- @param cons constructor of the sequence
--- @param conv(s) XML converter for the components
--- @return XML element converter for a repeated sequence
eRepSeq6 :: (Data a, Data b, Data c, Data d, Data e, Data f, Data g) =>
            String -> (a -> b -> c -> d -> e -> f -> g)
         -> XmlConv Repeatable _ a -> XmlConv Repeatable _ b
         -> XmlConv Repeatable _ c -> XmlConv Repeatable _ d
         -> XmlConv Repeatable _ e -> XmlConv Repeatable _ f
         -> XElemConv [g]
eRepSeq6 name cons xa xb xc xd xe xf
  = element name (repSeq6 cons xa xb xc xd xe xf)

XAttrConv XElemConv XOptConv XPrimConv XRepConv XmlReads XmlShows

safe