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;;; pict.scm --- A simple picture language for Guile
;;; Copyright © 2019 Ricardo Wurmus <rekado@elephly.net>
;;;
;;; This library is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU Lesser General Public License
;;; as published by the Free Software Foundation; either version 3 of
;;; the License, or (at your option) any later version.
;;;
;;; This library is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public
;;; License along with this library. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;;
;;; This is an adaptation of Guile's xml->sxml from (sxml simple), as
;;; released in version 2.2.4. The difference is in the handling of
;;; namespaces, which is important for round trips XML->SXML->XML
;;; again. For more information see Guile bug 20339
;;; <https://bugs.gnu.org/20339>
(define-module (pict sxml)
#:use-module (sxml simple)
#:use-module (sxml ssax input-parse)
#:use-module (sxml ssax)
#:use-module (sxml transform)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-13)
#:export (xml->sxml))
(define* (xml->sxml #:optional (string-or-port (current-input-port)) #:key
(namespaces '())
(declare-namespaces? #t)
(trim-whitespace? #f)
(entities '())
(default-entity-handler #f)
(doctype-handler #f))
"Use SSAX to parse an XML document into SXML. Takes one optional
argument, @var{string-or-port}, which defaults to the current input
port."
;; NAMESPACES: alist of PREFIX -> URI. Specifies the symbol prefix
;; that the user wants on elements of a given namespace in the
;; resulting SXML, regardless of the abbreviated namespaces defined in
;; the document by xmlns attributes. If DECLARE-NAMESPACES? is true,
;; these namespaces are treated as if they were declared in the DTD.
;; ENTITIES: alist of SYMBOL -> STRING.
;; NAMESPACES: list of (DOC-PREFIX . (USER-PREFIX . URI)).
;; A DOC-PREFIX of #f indicates that it comes from the user.
;; Otherwise, prefixes are symbols.
(define (munge-namespaces namespaces)
(map (lambda (el)
(match el
((prefix . uri-string)
(cons* (and declare-namespaces? prefix)
prefix
(ssax:uri-string->symbol uri-string)))))
namespaces))
(define (user-namespaces)
(munge-namespaces namespaces))
(define (user-entities)
(if (and default-entity-handler
(not (assq '*DEFAULT* entities)))
(acons '*DEFAULT* default-entity-handler entities)
entities))
(define (name->sxml name namespaces)
(match name
((prefix . local-part)
(let ((abbrev (and=> (find (match-lambda
((abbrev uri . rest)
(and (eq? uri prefix) abbrev)))
namespaces)
first)))
(match abbrev
('*DEFAULT* local-part)
(_ (symbol-append abbrev (string->symbol ":") local-part)))))
(_ name)))
(define (doctype-continuation seed)
(lambda* (#:key (entities '()) (namespaces '()))
(values #f
(append entities (user-entities))
(append (munge-namespaces namespaces) (user-namespaces))
seed)))
;; The SEED in this parser is the SXML: initialized to '() at each new
;; level by the fdown handlers; built in reverse by the fhere parsers;
;; and reverse-collected by the fup handlers.
(define parser
(ssax:make-parser
NEW-LEVEL-SEED ; fdown
(lambda (elem-gi attributes namespaces expected-content seed)
'())
FINISH-ELEMENT ; fup
(lambda (elem-gi attributes namespaces parent-seed seed)
(let ((seed (if trim-whitespace?
((@@ (sxml simple) ssax:reverse-collect-str-drop-ws) seed)
((@@ (sxml simple) ssax:reverse-collect-str) seed)))
(attrs (append
;; Namespace declarations
(filter-map (match-lambda
(('*DEFAULT* . _) #f)
((abbrev uri . _)
(list (symbol-append 'xmlns: abbrev)
(symbol->string uri))))
namespaces)
(attlist-fold
(lambda (attr accum)
(cons (list (name->sxml (car attr) namespaces)
(cdr attr))
accum))
'() attributes))))
(acons (name->sxml elem-gi namespaces)
(if (null? attrs)
seed
(cons (cons '@ attrs) seed))
parent-seed)))
CHAR-DATA-HANDLER ; fhere
(lambda (string1 string2 seed)
(if (string-null? string2)
(cons string1 seed)
(cons* string2 string1 seed)))
DOCTYPE
;; -> ELEMS ENTITIES NAMESPACES SEED
;;
;; ELEMS is for validation and currently unused.
;;
;; ENTITIES is an alist of parsed entities (symbol -> string).
;;
;; NAMESPACES is as above.
;;
;; SEED builds up the content.
(lambda (port docname systemid internal-subset? seed)
(call-with-values
(lambda ()
(cond
(doctype-handler
(doctype-handler docname systemid
(and internal-subset?
((@@ (sxml simple) read-internal-doctype-as-string) port))))
(else
(when internal-subset?
(ssax:skip-internal-dtd port))
(values))))
(doctype-continuation seed)))
UNDECL-ROOT
;; This is like the DOCTYPE handler, but for documents that do not
;; have a <!DOCTYPE!> entry.
(lambda (elem-gi seed)
(call-with-values
(lambda ()
(if doctype-handler
(doctype-handler #f #f #f)
(values)))
(doctype-continuation seed)))
PI
((*DEFAULT*
. (lambda (port pi-tag seed)
(cons
(list '*PI* pi-tag (ssax:read-pi-body-as-string port))
seed))))))
(let* ((port (if (string? string-or-port)
(open-input-string string-or-port)
string-or-port))
(elements (reverse (parser port '()))))
`(*TOP* ,@elements)))
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