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Diffstat (limited to 'tests/gpgscm/xml.scm')
| -rw-r--r-- | tests/gpgscm/xml.scm | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/tests/gpgscm/xml.scm b/tests/gpgscm/xml.scm new file mode 100644 index 0000000..771ec36 --- /dev/null +++ b/tests/gpgscm/xml.scm @@ -0,0 +1,142 @@ +;; A tiny XML library. +;; +;; Copyright (C) 2017 g10 Code GmbH +;; +;; This file is part of GnuPG. +;; +;; GnuPG 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 of the License, or +;; (at your option) any later version. +;; +;; GnuPG 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 this program; if not, see <http://www.gnu.org/licenses/>. + +(define xx + (begin + + ;; Private declarations. + (define quote-text + '((#\< "<") + (#\> ">") + (#\& "&"))) + + (define quote-attribute-' + '((#\< "<") + (#\> ">") + (#\& "&") + (#\' "'"))) + + (define quote-attribute-'' + '((#\< "<") + (#\> ">") + (#\& "&") + (#\" """))) + + (define (escape-string quotation string sink) + ;; This implementation is a bit awkward because iteration is so + ;; slow in TinySCHEME. We rely on string-index to skip to the + ;; next character we need to escape. We also avoid allocations + ;; wherever possible. + + ;; Given a list of integers or #f, return the sublist that + ;; starts with the lowest integer. + (define (min* x) + (let loop ((lowest x) (rest x)) + (if (null? rest) + lowest + (loop (if (or (null? lowest) (not (car lowest)) + (and (car rest) (> (car lowest) (car rest)))) rest lowest) + (cdr rest))))) + + (let ((i 0) (start 0) (len (string-length string)) + (indices (map (lambda (x) (string-index string (car x))) quotation)) + (next #f) (c #f)) + + ;; Set 'i' to the index of the next character that needs + ;; escaping, 'c' to the character that needs to be escaped, + ;; and update 'indices'. + (define (skip!) + (set! next (min* indices)) + (set! i (if (null? next) #f (car next))) + (if i + (begin + (set! c (string-ref string i)) + (set-car! next (string-index string c (+ 1 i)))) + (set! i (string-length string)))) + + (let loop () + (skip!) + (if (< i len) + (begin + (display (substring string start i) sink) + (display (cadr (assv c quotation)) sink) + (set! i (+ 1 i)) + (set! start i) + (loop)) + (display (substring string start len) sink))))) + + (let ((escape-string-s (lambda (quotation string) + (let ((sink (open-output-string))) + (escape-string quotation string sink) + (get-output-string sink))))) + (assert (equal? (escape-string-s quote-text "foo") "foo")) + (assert (equal? (escape-string-s quote-text "foo&") "foo&")) + (assert (equal? (escape-string-s quote-text "&foo") "&foo")) + (assert (equal? (escape-string-s quote-text "foo&bar") "foo&bar")) + (assert (equal? (escape-string-s quote-text "foo<bar") "foo<bar")) + (assert (equal? (escape-string-s quote-text "foo>bar") "foo>bar"))) + + (define (escape quotation datum sink) + (cond + ((string? datum) (escape-string quotation datum sink)) + ((symbol? datum) (escape-string quotation (symbol->string datum) sink)) + ((number? datum) (display (number->string datum) sink)) + (else + (throw "Do not know how to encode" datum)))) + + (define (name->string name) + (cond + ((symbol? name) (symbol->string name)) + (else name))) + + (package + + (define (textnode string) + (lambda (sink) + (escape quote-text string sink))) + + (define (tag name . rest) + (let ((attributes (if (null? rest) '() (car rest))) + (children (if (> (length rest) 1) (cadr rest) '()))) + (lambda (sink) + (display "<" sink) + (display (name->string name) sink) + (unless (null? attributes) + (display " " sink) + (for-each (lambda (a) + (display (car a) sink) + (display "=\"" sink) + (escape quote-attribute-'' (cadr a) sink) + (display "\" " sink)) attributes)) + (if (null? children) + (display "/>\n" sink) + (begin + (display ">\n" sink) + (for-each (lambda (c) (c sink)) children) + (display "</" sink) + (display (name->string name) sink) + (display ">\n" sink)))))) + + (define (document root . rest) + (let ((attributes (if (null? rest) '() (car rest)))) + (lambda (sink) + ;; xxx ignores attributes + (display "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" sink) + (root sink) + (newline sink))))))) |