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Implement surrogate pairs in the encoder. #7

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Implement surrogate pairs in the encoder. #7

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11 changes: 11 additions & 0 deletions src/encoder.lisp
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Original file line number Diff line number Diff line change
Expand Up @@ -375,6 +375,15 @@ STREAM (or to *JSON-OUTPUT*)."
(write-char #\" stream)
nil)

(defun encode-json-surrogate-pairs-character (char)
"Write characters in range of surrogate pairs to JSON
escape sequence, char -> string."
(let* ((c (char-code char))
(o (- c #x10000)))
(let ((c1 (logior #xD800 (ash o -10)))
(c2 (logior #xDC00 (logand o #x3FF))))
(format nil "\\u~X\\u~X" c1 c2))))

(defun write-json-chars (s stream)
"Write JSON representations (chars or escape sequences) of
characters in string S to STREAM."
Expand All @@ -383,6 +392,8 @@ characters in string S to STREAM."
with special
if (setq special (car (rassoc ch +json-lisp-escaped-chars+)))
do (write-char #\\ stream) (write-char special stream)
else if (<= #x10000 code #x10FFFF)
do (write-string (encode-json-surrogate-pairs-character ch) stream)
else if (< #x1f code #x7f)
do (write-char ch stream)
else
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