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; $Revision: 3.14 $ from $Date: 2003/12/23 05:39:31 $:
;
; This software is in Public Domain.
; IT IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND.
;
; Please send bug reports and comments to lisovsky@acm.org
; Kirill Lisovsky
;
; SXML normal form used for normalization-dependent functions:
; If attr-list is present it's always the second in SXML element.
; If aux-list is present - then list of attributes is always
; included, and aux-list is always the third.
; Minimized form is just the same, but all the empty aux-lists are
; absent, and empty attr-lists are present only in elements with aux-lists
; present.
;==============================================================================
; Auxiliary functions.
(define (make-char-quotator char-encoding)
(let ((bad-chars (map car char-encoding)))
; Check to see if str contains one of the characters in charset,
; from the position i onward. If so, return that character's index.
; otherwise, return #f
(define (index-cset str i charset)
(let loop ((i i))
(and (< i (string-length str))
(if (memv (string-ref str i) charset) i
(loop (inc i))))))
; The body of the function
(lambda (str)
(let ((bad-pos (index-cset str 0 bad-chars)))
(if (not bad-pos) str ; str had all good chars
(let loop ((from 0) (to bad-pos))
(cond
((>= from (string-length str)) '())
((not to)
(cons (substring str from (string-length str)) '()))
(else
(let ((quoted-char
(cdr (assv (string-ref str to) char-encoding)))
(new-to
(index-cset str (inc to) bad-chars)))
(if (< from to)
(cons
(substring str from to)
(cons quoted-char (loop (inc to) new-to)))
(cons quoted-char (loop (inc to) new-to))))))))))
))
; unlike filter-map from SRFI-1 this function uses separate predicate
; and mapping functions.
; Applies proc to all the elements of source list that satisfy the predicate
; and return the list of the results.
(define (filter-and-map pred proc lis)
(let rpt ((l lis))
(if (null? l)
'()
(if (pred (car l))
(cons (proc (car l)) (rpt (cdr l)))
(rpt (cdr l))))))
; Applies pred to every member of lst and yields #t if all the results
; are #t
(define (check-list pred lst)
(cond
((null? lst) #t)
((pred (car lst))
(check-list pred (cdr lst)))
(else #f)))
; Returns attr-list node for a given obj
; or #f if it is absent
(define (sxml:attr-list-node obj)
(if (and (not (null? (cdr obj)))
(pair? (cadr obj))
(eq? '% (caadr obj)))
(cadr obj)
#f))
; Returns attr-list wrapped in list
; or '((%)) if it is absent and aux-list is present
; or '() if both lists are absent
(define (sxml:attr-as-list obj)
(cond
((sxml:attr-list-node obj)
=> list)
((sxml:aux-list-node obj)
'((%)))
(else '())))
; Returns aux-list node for a given obj
; or #f if it is absent
(define (sxml:aux-list-node obj)
(if
(or (null? (cdr obj))
(null? (cddr obj))
(not (pair? (caddr obj)))
(not (eq? (caaddr obj) '%%)))
#f
(caddr obj)))
; Returns aux-list wrapped in list
; or '() if it is absent
(define (sxml:aux-as-list obj)
(cond
((sxml:aux-list-node obj)
=> list)
(else '())))
; optimized (string-rindex name #\:)
; returns position of a separator between namespace-id and LocalName
(define-macro (sxml:find-name-separator len)
`(let rpt ((pos (mm ,len)))
(cond
((negative? pos) #f)
((char=? #\: (string-ref name pos)) pos)
(else (rpt (mm pos))))))
;==============================================================================
; Predicates
; Predicate which returns #t if given element <obj> is empty.
; Empty element has no nested elements, text nodes, PIs, Comments or entities
; but it may contain attributes or namespace-id.
; It is a SXML counterpart of XML empty-element.
(define (sxml:empty-element? obj)
(not
((select-first-kid
(lambda(x)
(or ((ntype-names?? '(*PI* *COMMENT* *ENTITY*)) x)
((ntype?? '*) x)
(string? x)))) obj)))
; Returns #t if the given <obj> is shallow-normalized SXML element.
; The element itself has to be normalised but its nested elements are not tested.
(define (sxml:shallow-normalized? obj)
(or
(null? (cdr obj))
(and (or
(and
(pair? (cadr obj))
(eq? (caadr obj) '%))
(not ((select-first-kid (ntype-names?? '(% %%))) obj)))
(or (null? (cddr obj))
(and (pair? (caddr obj))
(eq? (caaddr obj) '%%))
(not ((select-first-kid (ntype?? '%%)) obj))))))
; Returns #t if the given <obj> is normalized SXML element.
; The element itself and all its nested elements have to be normalised.
(define (sxml:normalized? obj)
(and
(sxml:shallow-normalized? obj)
(check-list
(lambda(x)
(if
(sxml:element? x)
(sxml:normalized? x)
#t))
(sxml:content obj))
))
; Returns #t if the given <obj> is shallow-minimized SXML element.
; The element itself has to be minimised but its nested elements are not tested.
(define (sxml:shallow-minimized? obj)
(and
(sxml:shallow-normalized? obj)
(not (and (sxml:aux-list-node obj)
(null? (sxml:aux-list obj))))
(not (and (sxml:attr-list-node obj)
(null? (sxml:attr-list obj))
(not (sxml:aux-list-node obj))))))
; Returns #t if the given <obj> is minimized SXML element.
; The element itself and all its nested elements have to be minimised.
(define (sxml:minimized? obj)
(and
(sxml:shallow-minimized? obj)
(check-list
(lambda(x)
(if
(sxml:element? x)
(sxml:minimized? x)
#t))
(sxml:content obj))
))
;==============================================================================
; Accessors
; Returns a name of a given SXML node
; It is introduced for the sake of encapsulation.
(define sxml:name car)
; A version of sxml:name, which returns #f if the given <obj> is
; not a SXML element.
; Otherwise returns its name.
(define (sxml:element-name obj)
(and ((ntype?? '*) obj)
(car obj)))
; Safe version of sxml:name, which returns #f if the given <obj> is
; not a SXML node.
; Otherwise returns its name.
(define (sxml:node-name obj)
(and (pair? obj)
(symbol? (car obj))
(car obj)))
; Returns Local Part of Qualified Name (Namespaces in XML production [6])
; for given obj, which is ":"-separated suffix of its Qualified Name
; If a name of a node given is NCName (Namespaces in XML production [4]), then
; it is returned as is.
; Please note that while SXML name is a symbol this function returns a string.
(define (sxml:ncname obj)
(let* ((name (symbol->string (car obj)))
(len (string-length name)))
(cond
((sxml:find-name-separator len)
=> (lambda (pos)
(substring name (+ pos 1) len)))
(else name))))
; Returns namespace-id part of given name, or #f if it's LocalName
(define (sxml:name->ns-id sxml-name)
(let* ((name (symbol->string sxml-name)))
(cond
((sxml:find-name-separator (string-length name))
=> (lambda (pos)
(substring name 0 pos)))
(else #f))))
; Returns the content of given SXML element or nodeset (just text and element
; nodes) representing it as a list of strings and nested elements in document
; order. This list is empty if <obj> is empty element or empty list.
(define (sxml:content obj)
(((if (nodeset? obj)
sxml:filter
select-kids)
(lambda(x)
(or
(string? x) ; ((ntype?? '*text*) x)
((ntype?? '*) x))))
obj))
; Returns a string which combines all the character data
; from text node childrens of the given SXML element
; or "" if there is no text node children
(define (sxml:text obj)
(let ((tnodes
((select-kids
string?)
obj)))
(cond
((null? tnodes) "")
((null? (cdr tnodes))
(car tnodes))
(else (string-intersperse tnodes "")))))
;------------------------------------------------------------------------------
; Normalization-dependent accessors
;
;
; "Universal" accessors are less effective but may be used for non-normalized SXML
; Safe accessors are named with suffix '-u'
;
; "Fast" accessors are optimized for normalized SXML data.
; They are not applicable to arbitrary non-normalized SXML data
; Their names has no specific suffixes
; Returns all the content of normalized SXML element except attr-list and
; aux-list.
; Thus it includes PI, COMMENT and ENTITY nodes as well as TEXT and ELEMENT nodes
; returned by sxml:content.
; Returns a list of nodes in document order or empty list if <obj> is empty
; element or empty list.
; This function is faster than sxml:content
(define (sxml:content-raw obj)
((if (and (not (null? (cdr obj)))
(pair? (cadr obj)) (eq? (caadr obj) '%))
(if (and (not (null? (cddr obj)))
(pair? (caddr obj)) (eq? (caaddr obj) '%%))
cdddr
cddr)
cdr) obj))
; Returns the list of attributes for given element or nodeset.
; Analog of ((sxpath '(% *)) obj)
; Empty list is returned if there is no list of attributes.
(define (sxml:attr-list-u obj)
(cond (((select-first-kid (ntype?? '%)) obj)
=> cdr)
(else '())))
; Returns the list of auxiliary nodes for given element or nodeset.
; Analog of ((sxpath '(%% *)) obj)
; Empty list is returned if a list of auxiliary nodes is absent.
(define (sxml:aux-list obj)
(if
(or (null? (cdr obj))
(null? (cddr obj))
(not (pair? (caddr obj)))
(not (eq? (caaddr obj) '%%)))
'()
(cdaddr obj)))
; Returns the list of auxiliary nodes for given element or nodeset.
; Analog of ((sxpath '(%% *)) obj)
; Empty list is returned if a list of auxiliary nodes is absent.
(define (sxml:aux-list-u obj)
(cond (((select-first-kid (ntype?? '%%)) obj)
=> cdr)
(else '())))
; Return the first aux-node with <aux-name> given in SXML element <obj>
; or #f is such a node is absent.
; NOTE: it returns just the FIRST node found even if multiple nodes are
; present, so it's mostly intended for nodes with unique names
(define (sxml:aux-node obj aux-name)
(cond
((assq aux-name (sxml:aux-list obj)))
(else #f)))
; Return a list of aux-node with <aux-name> given in SXML element <obj>
; or '() if such a node is absent.
(define (sxml:aux-nodes obj aux-name)
(filter
(lambda(x) (eq? aux-name (car x)))
(sxml:aux-list obj)))
; Accessor for an attribute <attr-name> of given SXML element <obj> which
; It returns:
; the value of the attribute if the attribute is present
; #f if there is no such an attribute in the given element
(define (sxml:attr obj attr-name)
(cond
((assq attr-name (sxml:attr-list obj))
=> cadr)
(else #f)))
; Extracts a value of attribute with given name from attr-list
(define (sxml:attr-from-list attr-list name)
(cond
((assq name attr-list)
=> cadr)
(else #f)))
; Accessor for a numerical attribute <attr-name> of given SXML element <obj>
; which It returns:
; a value of the attribute as the attribute as a number if the attribute
; is present and its value may be converted to number using string->number
; #f if there is no such an attribute in the given element or
; its value can't be converted to a number
(define (sxml:num-attr obj attr-name)
(cond
((assq attr-name (sxml:attr-list obj))
=> (lambda(x) (string->number (cadr x))))
(else #f)))
; Accessor for an attribute <attr-name> of given SXML element <obj> which
; may also be an attributes-list or nodeset (usually content of SXML element)
;
; It returns:
; the value of the attribute if the attribute is present
; #f if there is no such an attribute in the given element
(define (sxml:attr-u obj attr-name)
(cond
((assq attr-name
; the list of attributes is computed below
(cond
((and (not (null? (cdr obj)))
(pair? (cadr obj))
(eq? '% (caadr obj)))
(cdadr obj)) ; fast track for normalized elements
((eq? '% (car obj))
(cdr obj)) ; if applied to attr-list
(else (sxml:attr-list-u obj))))
=> cadr)
(else #f)))
; Returns the list of namespaces for given element.
; Analog of ((sxpath '(%% *NAMESPACES* *)) obj)
; Empty list is returned if there is no list of namespaces.
(define (sxml:ns-list obj)
(cond ((assv '*NAMESPACES* (sxml:aux-list obj))
=> cdr)
(else '())))
; Returns the list of namespace-assoc's for given namespace-id in
; SXML element <obj>.
; Analog of ((sxpath '(%% *NAMESPACES* namespace-id)) obj)
; Empty list is returned if there is no namespace-assoc with namespace-id
; given.
(define (sxml:ns-id->nodes obj namespace-id)
(filter
(lambda(x)
(eq? (car x) namespace-id))
(sxml:ns-list obj)))
; It returns:
; A URI's for namespace-id given
; #f if there is no namespace-assoc with namespace-id given
(define (sxml:ns-id->uri obj namespace-id)
(cond
((assq namespace-id (sxml:ns-list obj))
=> cadr)
(else #f)))
; Returns a list of namespace-assocs nodes for NS URI given
(define (sxml:ns-uri->nodes obj URI)
(filter
(lambda (ns-assoc)
(string=? (cadr ns-assoc) URI))
(sxml:ns-list obj)))
; Returns a namespace-id for NS URI given
(define (sxml:ns-uri->id obj URI)
(let rpt ((ns-assocs (sxml:ns-list obj)))
(cond
((null? ns-assocs) #f)
((string=? (cadar ns-assocs) URI)
(caar ns-assocs))
(else (rpt (cdr ns-assocs)))
)))
; Returns namespace-id for given namespace-assoc list
(define sxml:ns-id car)
; Returns URI for given namespace-assoc list
(define sxml:ns-uri cadr)
; It returns namespace prefix for given namespace-assoc list
; Original (as in XML document) prefix for namespace-id given
; has to be strored as the third element in namespace-assoc list
; if it is different from namespace-id.
; If original prefix is omitted in namespace-assoc then
; namespace-id is used instead
(define (sxml:ns-prefix ns-assoc)
(if (> (length ns-assoc) 2)
(caddr ns-assoc)
(car ns-assoc)))
;==============================================================================
; Data modification functions
; Constructors and mutators for normalized SXML data
;
; This functions are optimized for normalized SXML data.
; They are not applicable to arbitrary non-normalized SXML data
;
; Most of the functions are provided in two variants:
; 1. side-effect intended functions for linear update of given elements.
; Their names are ended with exclamation mark.
; An example:
; sxml:change-content!
; 2. pure functions without side-effects which return modified elements.
; An example:
; sxml:change-content
; Change the content of given SXML element to <new-content>
; If <new-content> is an empty list then the <obj> is transformed
; The resulting SXML element is normalized
; Former name sxml:content!
(define (sxml:change-content! obj new-content)
(set-cdr! obj
`(
,@(sxml:attr-as-list obj)
,@(sxml:aux-as-list obj)
,@new-content)))
; Change the content of given SXML element to <new-content>
; If <new-content> is an empty list then the <obj> is transformed
; to an empty element
; The resulting SXML element is normalized
(define (sxml:change-content obj new-content)
`(,(sxml:name obj)
,@(sxml:attr-as-list obj)
,@(sxml:aux-as-list obj)
,@new-content))
; The resulting SXML element is normalized, if <new-attrlist> is empty,
; the cadr of <obj> is (%)
(define (sxml:change-attrlist obj new-attrlist)
`(,(sxml:name obj)
,@(cond
(new-attrlist
`((% ,@new-attrlist)))
((sxml:aux-list-node obj)
'((%)))
(else `()))
,@(sxml:aux-as-list obj)
,@(sxml:content obj)))
; The resulting SXML element is normalized, if <new-attrlist> is empty,
; the cadr of <obj> is (%)
; Former name sxml:attrlist!
(define (sxml:change-attrlist! obj new-attrlist)
(set-cdr! obj
`(
,@(cond
(new-attrlist
`((% ,@new-attrlist)))
((sxml:aux-list-node obj)
'((%)))
(else `()))
,@(sxml:aux-as-list obj)
,@(sxml:content obj))))
; Change a name of SXML element destructively
; Former name was 'sxml:name!'
(define (sxml:change-name! obj new-name)
(set-car! obj new-name))
; Returns SXML element with its name changed
(define (sxml:change-name obj new-name)
(cons new-name (cdr obj)))
; Returns SXML element <obj> with attribute <attr> added or #f
; if the attribute with given name already exists,
; <attr> is (<attr-name> <attr-value>)
; Pure functional counterpart to sxml:add-attr!
(define (sxml:add-attr obj attr)
(let ((attr-list (sxml:attr-list obj)))
(if (assq (car attr) attr-list)
#f
`(,(sxml:name obj)
(% ,@(cons attr attr-list))
,@(sxml:aux-as-list obj)
,@(sxml:content obj)))))
; Add an attribute <attr> for an element <obj>
; Returns #f if the attribute with given name already exists.
; The resulting SXML node is normalized.
; Linear update counterpart to sxml:add-attr
(define (sxml:add-attr! obj attr)
(let ((attr-list (sxml:attr-list obj)))
(if (assq (car attr) attr-list)
#f
(begin
(set-cdr! obj
`(
(% ,@(cons attr attr-list))
,@(sxml:aux-as-list obj)
,@(sxml:content obj)))
obj))))
; Returns SXML element <obj> with changed value of attribute <attr> or #f
; if where is no attribute with given name.
; <attr> is (<attr-name> <attr-value>)
(define (sxml:change-attr obj attr)
(let ((attr-list (sxml:attr-list obj)))
(if (null? attr-list)
#f
(cond
((assv (car attr) attr-list)
=> (lambda (y)
`(,(sxml:name obj)
(% ,@(map
(lambda(at)
(if
(eq? at y)
attr
at))
attr-list))
,@(sxml:aux-as-list obj)
,@(sxml:content obj)
)))
(else #f)))))
; Change value of the attribute for element <obj>
; <attr> is (<attr-name> <attr-value>)
; Returns #f if where is no such attribute
(define (sxml:change-attr! obj attr)
(let ((x (sxml:attr-list obj)))
(if (null? x)
#f
(cond
((assv (car attr) x) => (lambda (y)
(set-cdr! y (cdr attr)) obj))
(else #f)))))
; Set attribute <attr> of element <obj>
; If there is no such attribute the new one is added
(define (sxml:set-attr obj attr)
(let ((attr-list (sxml:attr-list obj)))
(cond
((assv (car attr) attr-list)
=> (lambda (y)
`(,(sxml:name obj)
(% ,@(map
(lambda(at)
(if
(eq? at y)
attr
at))
attr-list))
,@(sxml:aux-as-list obj)
,@(sxml:content obj)
)))
(else
`(,(sxml:name obj)
(% ,@(cons attr attr-list))
,@(sxml:aux-as-list obj)
,@(sxml:content obj))))
))
; Set attribute <attr> of element <obj>
; If there is no such attribute the new one is added
(define (sxml:set-attr! obj attr)
(let ((attr-list (sxml:attr-list obj)))
(cond
((assv (car attr) attr-list)
=> (lambda (x) (set-cdr! x (cdr attr))))
(else (set-cdr! obj
`((% ,@(cons attr attr-list))
,@(sxml:aux-as-list obj)
,@(sxml:content obj))))
)))
; Returns SXML element <obj> with an auxiliary node <aux-node> added
(define (sxml:add-aux obj aux-node)
`(,(sxml:name obj)
(% ,@(sxml:attr-list obj))
(%% ,@(cons aux-node (sxml:aux-list obj)))
,@(sxml:content obj)))
; Add an auxiliary node <aux-node> for an element <obj>
(define (sxml:add-aux! obj aux-node)
(set-cdr! obj
`(
(% ,@(sxml:attr-list obj))
(%% ,@(cons aux-node (sxml:aux-list obj)))
,@(sxml:content obj)))
obj)
; Eliminates empty lists of attributes and aux-lists for given SXML element
; <obj> and its descendants ("minimize" it)
; Returns: minimized and normalized SXML element
(define (sxml:squeeze! obj)
(set-cdr! obj
`(,@(cond
((sxml:attr-list-node obj)
=> (lambda (atl)
(if (and (null? (cdr atl))
(null? (sxml:aux-list obj)))
'()
(list atl))))
(else '()))
,@(cond ((sxml:aux-list-node obj)
=> (lambda (axl)
(if (null? (cdr axl))
'()
(list axl))))
(else '()))
,@(map
(lambda(x)
(cond
(((ntype?? '*) x)
(sxml:squeeze! x)
x)
(else x)))
(sxml:content obj))
))
)
; Eliminates empty lists of attributes and aux-lists for given SXML element
; <obj> and its descendants ("minimize" it)
; Returns: minimized and normalized SXML element
(define (sxml:squeeze obj)
`(,(sxml:name obj)
,@(cond
((sxml:attr-list-node obj)
=> (lambda (atl)
(if (and (null? (cdr atl))
(null? (sxml:aux-list obj)))
'()
(list atl))))
(else '()))
,@(cond ((sxml:aux-list-node obj)
=> (lambda (axl)
(if (null? (cdr axl))
'()
(list axl))))
(else '()))
,@(map
(lambda(x)
(cond
(((ntype?? '*) x)
(sxml:squeeze x))
(else x)))
(sxml:content obj))))
; Eliminates empty lists of attributes and ALL aux-lists for given SXML element
; <obj> and its descendants
; Returns: minimized and normalized SXML element
(define (sxml:clean obj)
`(,(sxml:name obj)
,@(cond
((sxml:attr-list-node obj)
=> (lambda (atl)
(if (null? (cdr atl))
'()
(list atl))))
(else '()))
,@(map
(lambda(x)
(cond
(((ntype?? '*) x)
(sxml:clean x))
(else x)))
(sxml:content obj))))
;==============================================================================
; SXPath-related
;------------------------------------------------------------------------------
; Extensions
; select-first-kid:: Pred -> Node -> Node
; Given a Node, return its first child that satisfy
; the test-pred?
; Returns #f if there is no such a child
; select-first-kid:: Pred -> Nodeset -> Node
; The same as above, but select among children of all the nodes in
; the Nodeset
(define (select-first-kid test-pred?)
(lambda(obj)
(let rpt ((lst (if (symbol? (car obj))
(cdr obj)
obj)))
(cond
((null? lst) #f)
((and (pair? (car lst))
(test-pred? (car lst)))
(car lst))
(else (rpt (cdr lst))))
)))
;------------------------------------------------------------------------------
; Fast node-parent
; Returns a function of one argument - SXML element - which returns its parent
; node using *PARENT* pointer in aux-list
; '*TOP-PTR* may be used as a pointer to root node
; It return an empty list when applyed to root node
(define (sxml:node-parent rootnode)
(lambda(obj)
(cond
((sxml:aux-node obj '*PARENT*)
=> (lambda(x)
(if
(eq? '*TOP-PTR* (cadr x))
rootnode
((cadr x)))))
((and (pair? obj)
(eq? (car obj) '*TOP* ))
'())
(else (sxml:error nl "PARENT pointer is absent in: " obj nl)
))))
(define (sxml:add-parents obj . top-ptr)
(let rpt
((elt obj)
(p '*TOP*)
(at-aux (if (eq? (sxml:name obj) '*TOP*)
(list (cons '%% (sxml:aux-list-u obj)))
(list
(cons '% (sxml:attr-list obj))
(cons '%% (cons `(*PARENT* ,(lambda() (car top-ptr)))
(sxml:aux-list obj))))))
) ; *TOP* is a parent for top-level element
(let* ((h (list (sxml:name elt)))
(b (append
at-aux
(map
(lambda(x)
(cond
(((ntype?? '*) x)
(rpt x h
(list
(cons '% (sxml:attr-list x))
(cons '%% (cons `(*PARENT* ,(lambda() h))
(sxml:aux-list x))))
))
(else x)))
(sxml:content elt)))))
(set-cdr! h b)
h)))
; Lookup an element using its ID
(define (sxml:lookup id index)
(cond
((assoc id index)
=> cdr)
(else #f)))
;==============================================================================
; Markup generation
;------------------------------------------------------------------------------
; XML
; Creates the XML markup for attributes.
(define (sxml:attr->xml attr)
(list " " (sxml:ncname attr)
"='" (cadr attr) "'"))
; Return a string or a list of strings where all the occurences of
; characters < > & " ' in a given string are replaced by corresponding
; character entity references. See also: sxml:string->html
(define sxml:string->xml
(make-char-quotator
'((#\< . "<") (#\> . ">") (#\& . "&")
(#\" . """) (#\' . "'"))))
; A version of dispatch-node specialized and optimized for SXML->XML
; transformation.
(define (sxml:sxml->xml tree)
(cond
((nodeset? tree)
(map (lambda (a-tree)
(sxml:sxml->xml a-tree))
tree))
((pair? tree)
(let* ((name (sxml:name tree)) ; NS (URI-prefixed) not supported
(nm (symbol->string name))
(content (sxml:content-raw tree)))
`("<" ,nm ,@(map sxml:attr->xml (sxml:attr-list tree))
,@(if (null? content) '("/>")
`(">" ,@(sxml:sxml->xml content) "</" ,nm ">")))))
((string? tree) (sxml:string->xml tree)) ; *text*
(else (sxml:error "sxml->html - unexpected type of node: " tree))))
;------------------------------------------------------------------------------
; HTML
; Creates the HTML markup for attributes.
(define (sxml:attr->html attr)
(if (equal? "" (cadr attr))
(list " " (sxml:ncname attr))
(list " " (sxml:ncname attr) "='" (cadr attr) "'")))
; Given a string, check to make sure it does not contain characters
; < > & " that require encoding. Return either the original
; string, or a list of string fragments with special characters
; replaced by appropriate character entities.
; Borrowed from Oleg Kiselyov's XML-to-HTML.scm (where its name is
; string->goodHTML)
(define sxml:string->html
(make-char-quotator
'((#\< . "<") (#\> . ">") (#\& . "&") (#\" . """))))
; This predicate yields #t for "unterminated" HTML 4.0 tags
(define (sxml:non-terminated-html-tag? tag)
(memq tag
'(area base basefont br col frame hr img input isindex link meta param)))
; A version of dispatch-node specialized and optimized for SXML->HTML
; transformation.
(define (sxml:sxml->html tree)
(cond
((nodeset? tree)
(map (lambda (a-tree)
(sxml:sxml->html a-tree))
tree))
((pair? tree)
(let* ((name (sxml:name tree))
(nm (symbol->string name))
(content (sxml:content-raw tree)))
`("<" ,nm ,@(map sxml:attr->html (sxml:attr-list tree))
,@(if (null? content)
(if (sxml:non-terminated-html-tag? name) '(">") '("/>"))
`(">" ,@(sxml:sxml->html content) "</" ,nm ">")))))
((string? tree) (sxml:string->html tree)) ; *text*
(else (sxml:error "sxml->html - unexpected type of node: " tree))))
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