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;;;; This file is part of Gamma. -*- scheme -*-
;;;; Copyright (C) 2010-2018 Sergey Poznyakoff
;;;;
;;;; Gamma is free software; you can redistribute it and/or modify
;;;; it under the terms of the GNU General Public License as published by
;;;; the Free Software Foundation; either version 3, or (at your option)
;;;; any later version.
;;;;
;;;; Gamma 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 General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU General Public License
;;;; along with Gamma. If not, see <http://www.gnu.org/licenses/>.
(define-module (gamma expat)
:use-module (ice-9 rdelim)
:use-module (gamma documentation)
:use-module (gamma loader)
:use-module (srfi srfi-1)
:export (xml-make-parser
xml-parse-more
xml-parse
xml-set-handler)
:export-syntax (xml-error-descr))
(gamma-module-load "expat" "gamma_expat_init")
(define (xml-make-parser . rest)
(if (null? rest)
(xml-primitive-make-parser)
(letrec ((parser-setup (lambda (setup handler-args)
(let ((p
(apply xml-primitive-make-parser setup)))
(if (not (null? handler-args))
(apply xml-set-handler p handler-args))
p))))
(if (string? (car rest))
(let ((encoding (car rest))
(rest (cdr rest)))
(if (and (not (null? rest)) (char? (car rest)))
(parser-setup (list encoding (car rest))
(cdr rest))
(parser-setup (list encoding) rest)))
(parser-setup '() rest)))))
(define (xml-parse-more parser input)
(cond
((eof-object? input)
(xml-primitive-parse parser "" #t))
(else
(xml-primitive-parse parser input #f))))
(define (xml-parse parser . args)
(let ((port (if (null? args)
(current-input-port)
(car args))))
(let loop ((line (read-line port 'concat)))
(xml-parse-more parser line)
(if (not (eof-object? line))
(loop (read-line port 'concat))))))
(define (xml-set-handler parser . rest)
(if (odd? (length rest))
(scm-error 'wrong-number-of-args
"xml-set-handler"
"Wrong number of arguments to ~A"
(list "xml-set-handler")
#f))
(for-each
(lambda (elt)
(xml-primitive-set-handler parser (car elt) (cdr elt)))
(let ((prev-elem #f))
(fold-right
(lambda (elem prev)
(cond
(prev-elem
(let ((ret (cons (cons elem prev-elem) prev)))
(set! prev-elem #f)
ret))
(else
(set! prev-elem elem)
prev)))
'()
rest))))
(define-syntax xml-error-descr
(syntax-rules ()
((xml-error-descr ctx #:error-code)
(list-ref ctx 0))
((xml-error-descr ctx #:line)
(list-ref ctx 1))
((xml-error-descr ctx #:column)
(list-ref ctx 2))
((xml-error-descr ctx #:context)
(list-ref ctx 3))
((xml-error-descr ctx #:error-offset)
(list-ref ctx 4))
((xml-error-descr ctx #:has-context?)
(= (length ctx) 5))))
;;;; End of expat.scm
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