/
xmlp.scm
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/
xmlp.scm
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(require 'mp)
(require 'xmldom)
(define inputxml "<?xml version='1.0'?><stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' id='1216579762' from='localhost' version='1.0' xml:lang='en'>
<stream:features>
<starttls xmlns=\"urn:ietf:params:xml:ns:xmpp-tl\"/>
<mechanisms xmlns\"urn:ietf:params:xml:ns:xmpp-sas\">
<mechanism>DIGEST-MD5</mechanism>
<mechanism>PLAIN</mechanism>
</mechanisms>
<register xmlns=\"http://jabber.org/features/iq-register\"/>
</stream:features>")
;; LOL XML
(define (xml:node type . body)
(apply list type body))
(define (xml:start-tag tag . attrs)
(apply xml:node 'st tag attrs))
(define xml:tag-attrs cddr)
(define (xml:end-tag tag)
(xml:node 'et tag))
(define (xml:empty-tag tag . attrs)
(apply xml:node 'tag tag attrs))
;; ala x-sexp
(define (xml:tag tag attrs . body)
(apply xml:node 'tag tag attrs body))
(define (xml:a name value)
(list name value))
(define (xml:cdata data)
(xml:node 'cdata data))
(define xml:node-value cdr)
(define (xml:node-type? node type)
(and (list? node)
(eq? (car node) type)))
(define (xml:start-tag? node)
(xml:node-type? node 'st))
(define (xml:end-tag? node)
(xml:node-type? node 'et))
(define (xml:empty-tag? node)
(xml:node-type? node 'tag))
(define (xml:tag-name node)
(cadr node))
(define xp:< (mp:char #\<))
(define xp:> (mp:char #\>))
(define xp:/ (mp:char #\/))
(define xp:? (mp:char #\?))
(define xp:qlet (mp:char-parser (lambda (c) (and (char? c)
(or (and (char>=? c #\a) (char<=? c #\z))
(and (char>=? c #\A) (char<=? c #\Z))
(member c '(#\: #\-)))))
"qlet"))
(define xp:qname (>>= (<- str (mp:+/s xp:qlet))
(m:return str)))
(define xp:q (mp:any (mp:char #\') (mp:char #\")))
(define xp:nq (mp:char-parser (lambda (c) (and (char? c) (not (or (char=? c #\') (char=? c #\")))))
"non-quote"))
(define xp:entity-name
(>>= (mp:char #\&) (<- name xp:qname) (mp:char #\;) (m:return name)))
(define xp:entities '(("lt" "<")
("gt" ">")
("quot" "\"")
("amp" "&")))
(define xp:entity
(>>= (<- entity xp:entity-name)
(let ((val (assoc entity xp:entities)))
(if val
(m:return (cadr val))
(m:fail (format "entity ~s is unknown" entity))))))
(define xp:cdata
(>>=
(<- cdata (mp:+/s (mp:any xp:entity
(mp:char-parser (lambda (c)
(and (char? c)
(not (eq? c #\<)))) "non <"))))
(if (= (string-length cdata) 0)
(m:fail "cdata expected, got empty")
(m:return (xml:cdata cdata)))))
(define xp:qstring (>>= xp:q (<- qname (mp:+/s xp:nq)) xp:q (m:return qname)))
(define xp:attr-nvp (>>= (<- name xp:qname)
(mp:char #\=)
(<- value xp:qstring)
(m:return (xml:a name value))))
(define xp:blank (mp:any (mp:char #\space) (mp:char #\newline) (mp:char #\return) (mp:char #\tab)))
(define xp:blank* (mp:? (mp:+ xp:blank)))
(define xp:attr (>>= xp:blank (<- nvp xp:attr-nvp) (m:return nvp)))
(define xp:attr-list (mp:? (mp:+ xp:attr)))
(define xp:tag/close
(>>= xp:< xp:/ (<- name xp:qname) xp:> (m:return (xml:end-tag name))))
(define xp:tag/a* (>>= xp:<
(<- name xp:qname)
(<- attrs (mp:? xp:attr-list))
(mp:? xp:blank)
(<- closed (mp:? xp:/))
xp:>
(m:return
(if (null? closed)
;; TODO, how to deal with <aa/>?
(apply xml:start-tag name attrs)
(apply xml:empty-tag name attrs)))))
(define (xp:for-tag tag-name)
(>>=
xp:blank*
(<- tag xp:tag/a*)
(if (string-ci=? tag-name (xml:tag-name tag))
(m:return tag)
(m:fail (format "~s expected, got ~s" tag-name tag)))))
(define (xp:for-tag/body tag-name body-parser)
(>>=
(xp:for-tag tag-name)
(<- body body-parser)
(xp:for-tag/close tag-name)
(m:return body)))
(define (xp:for-tag/close tag-name)
(>>=
xp:blank*
(<- tag xp:tag/close)
(if (string-ci=? tag-name (xml:tag-name tag))
(m:return tag)
(m:fail (format "close ~s expected, got ~s" tag-name tag)))))
;; processing instruction
(define xp:processing
(>>=
xp:< xp:?
(<- name xp:qname)
(<- attrs (mp:? xp:attr-list))
xp:? xp:>
(m:return (xml:node 'pr name attrs))))
(define xp:xml-decl (>>=
(<- pr xp:processing)
(if (string=? (xml:tag-name pr) "xml")
(m:return pr)
(m:fail "xml declaration expected"))))
;(define xp:stream (xp:tag/a "stream:stream")) ;; tag with attrs
;; node sequence, sequence
;; parse a tag with a whole body
;; "tag" is a processing instruction or ta
(define xp:tag/body
(mp:any xp:processing
(>>=
(<- tag xp:tag/a*)
(<- body (mp:+ xp:tag/body))
(xp:for-tag/close (xml:tag-name tag))
(m:return (apply xml:node 'tag (xml:tag-name tag) (xml:tag-attrs tag) body)))
(>>=
(<- tag xp:tag/a*)
(if (xml:empty-tag? tag)
(m:return tag)
(m:fail "empty-tag expected")))
xp:cdata))
(define xp:stream xp:tag/a*)
(define xp:xml (>>= xp:xml-decl xp:blank*))
;; make dom from events
(define xp:dom
(mp:any (>>=
(<- processing xp:processing)
(m:return (dom:make-tag (xml:tag-name processing) (xml:tag-attrs processing) '())))
(>>=
(<- tag xp:tag/a*)
(<- body (mp:+ xp:dom))
(xp:for-tag/close (xml:tag-name tag))
(m:return (dom:make-tag (xml:tag-name tag) (xml:tag-attrs tag) body)))
(>>=
(<- tag xp:tag/a*)
(if (xml:empty-tag? tag)
(m:return (dom:make-tag (xml:tag-name tag) (xml:tag-attrs tag) '()))
(m:fail "empty-tag expected")))
xp:cdata))