Discussion:
JSON Parsing Edge Case
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Basil L. Contovounesios
2018-05-11 08:45:35 UTC
Permalink
I meant json-read-string --apologies. json-parse-buffer needs the
underlying emacs to be compiled with the json C module.
The following happens with both json-read -- the elisp implementation
as well as json-parse-string implemented in C --
{"quote": "1"}
The above is a json dict with one key -- "quote" -- with value 1.
Parsing this into an emacs alist -- either with (json-read) or
(json-parse-buffer)
yields the following lisp structure --
('. "1")
With json-read, and (json-read-from-string "{\"quote\": \"1\"}"), I get
((quote . "1"))
json-parse-string and json-parse-buffer don't seem to exist for me
(using the latest master branch).
FWIW, after emacs -Q and (require 'json), the following four forms all
evaluate to ((quote . "1")) on my end:

(with-temp-buffer
(insert "{\"quote\": \"1\"}")
(goto-char (point-min))
(json-read))

(with-temp-buffer
(insert "{\"quote\": \"1\"}")
(goto-char (point-min))
(json-parse-buffer :object-type 'alist))

(json-read-from-string "{\"quote\": \"1\"}")

(json-parse-string "{\"quote\": \"1\"}" :object-type 'alist)

AFAICT the json.el function json-read-string is for reading a single
JSON string at point, not a whole object.
--
Basil

In GNU Emacs 27.0.50 (build 20, x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
of 2018-05-10 built on thunk
Repository revision: 766b057e41df7316808ec7658836fda75facda75
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Debian GNU/Linux buster/sid

Configured using:
'configure 'CC=ccache gcc' 'CFLAGS=-march=native -O2 -pipe'
--config-cache --prefix=/home/blc/.local --with-mailutils
--with-x-toolkit=lucid --with-modules --with-file-notification=yes
--with-x'

Configured features:
XAW3D XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS
NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS LUCID X11 MODULES THREADS LIBSYSTEMD JSON LCMS2
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