/usr/share/guile/site/json/builder.scm is in guile-json 0.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 | ;;; (json builder) --- Guile JSON implementation.
;; Copyright (C) 2013 Aleix Conchillo Flaque <aconchillo@gmail.com>
;;
;; This file is part of guile-json.
;;
;; guile-json 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.
;;
;; guile-json 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 guile-json; if not, write to the Free Software
;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
;; 02110-1301 USA
;;; Commentary:
;; JSON module for Guile
;;; Code:
(define-module (json builder)
#:use-module (ice-9 format)
#:use-module (srfi srfi-1)
#:use-module (rnrs bytevectors)
#:export (scm->json
scm->json-string))
;;
;; String builder helpers
;;
(define (unicode->string unicode)
(format #f "\\u~4,'0x" unicode))
(define (char->unicode-string c)
(let ((unicode (char->integer c)))
(if (< unicode 32)
(unicode->string unicode)
(string c))))
(define (u8v-2->unicode bv)
(let ((bv0 (bytevector-u8-ref bv 0))
(bv1 (bytevector-u8-ref bv 1)))
(+ (ash (logand bv0 #b00011111) 6)
(logand bv1 #b00111111))))
(define (u8v-3->unicode bv)
(let ((bv0 (bytevector-u8-ref bv 0))
(bv1 (bytevector-u8-ref bv 1))
(bv2 (bytevector-u8-ref bv 2)))
(+ (ash (logand bv0 #b00001111) 12)
(ash (logand bv1 #b00111111) 6)
(logand bv2 #b00111111))))
(define (build-char-string c)
(let* ((bv (string->utf8 (string c)))
(len (bytevector-length bv)))
(cond
;; A single byte UTF-8
((eq? len 1) (char->unicode-string c))
;; If we have a 2 or 3 byte UTF-8 we need to output it as \uHHHH
((or (eq? len 2) (eq? len 3))
(let ((unicode (if (eq? len 2)
(u8v-2->unicode bv)
(u8v-3->unicode bv))))
(unicode->string unicode)))
;; Anything else should wrong, hopefully.
(else (throw 'json-invalid)))))
;;
;; Object builder functions
;;
(define (build-object-pair p port escape pretty level)
(display (indent-string pretty level) port)
(json-build-string (car p) port escape)
(display " : " port)
(json-build (cdr p) port escape pretty level))
(define (build-newline port pretty)
(cond (pretty (newline port))))
(define (indent-string pretty level)
(if pretty (format #f "~v_" (* 4 level)) ""))
;;
;; Main builder functions
;;
(define (json-build-null port)
(display "null" port))
(define (json-build-boolean scm port)
(display (if scm "true" "false") port))
(define (json-build-number scm port)
(if (and (rational? scm) (not (integer? scm)))
(display (number->string (exact->inexact scm)) port)
(display (number->string scm) port)))
(define (json-build-string scm port escape)
(display "\"" port)
(display
(list->string
(fold-right append '()
(map
(lambda (c)
(case c
((#\" #\\) `(#\\ ,c))
((#\bs) '(#\\ #\b))
((#\ff) '(#\\ #\f))
((#\lf) '(#\\ #\n))
((#\cr) '(#\\ #\r))
((#\ht) '(#\\ #\t))
((#\/) (if escape `(#\\ ,c) (list c)))
(else (string->list (build-char-string c)))))
(string->list scm))))
port)
(display "\"" port))
(define (json-build-array scm port escape pretty level)
(display "[" port)
(unless (null? scm)
(json-build (car scm) port escape pretty (+ level 1))
(for-each (lambda (v)
(display ", " port)
(json-build v port escape pretty (+ level 1)))
(cdr scm)))
(display "]" port))
(define (json-build-object scm port escape pretty level)
(build-newline port pretty)
(simple-format port "~A{" (indent-string pretty level))
(build-newline port pretty)
(let ((pairs (hash-map->list cons scm)))
(unless (null? pairs)
(build-object-pair (car pairs) port escape pretty (+ level 1))
(for-each (lambda (p)
(display "," port)
(build-newline port pretty)
(build-object-pair p port escape pretty (+ level 1)))
(cdr pairs))))
(build-newline port pretty)
(simple-format port "~A}" (indent-string pretty level)))
(define (json-build scm port escape pretty level)
(cond
((eq? scm #nil) (json-build-null port))
((boolean? scm) (json-build-boolean scm port))
((number? scm) (json-build-number scm port))
((string? scm) (json-build-string scm port escape))
((list? scm) (json-build-array scm port escape pretty level))
((hash-table? scm) (json-build-object scm port escape pretty level))
(else (throw 'json-invalid))))
;;
;; Public procedures
;;
(define* (scm->json scm
#:optional (port (current-output-port))
#:key (escape #f) (pretty #f))
"Creates a JSON document from native. The argument @var{scm} contains
the native value of the JSON document. Takes one optional argument,
@var{port}, which defaults to the current output port where the JSON
document will be written."
(json-build scm port escape pretty 0))
(define* (scm->json-string scm #:key (escape #f) (pretty #f))
"Creates a JSON document from native into a string. The argument
@var{scm} contains the native value of the JSON document."
(call-with-output-string
(lambda (p)
(scm->json scm p #:escape escape #:pretty pretty))))
;;; (json builder) ends here
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