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documentation,functests: State that UTF-8-only support is intentional

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ZyX
2016-03-12 20:54:19 +03:00
parent c129f6cfaf
commit 4f8b686435
2 changed files with 21 additions and 0 deletions
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13
runtime/doc/eval.txt
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@@ -4327,6 +4327,13 @@ json_decode({expr}) *json_decode()*
dictionary and for string will be emitted in case string
with NUL byte was a dictionary key.
Note: function treats its input as UTF-8 always regardless of
'encoding' value. This is needed because JSON source is
supposed to be external (e.g. |readfile()|) and JSON standard
allows only a few encodings, of which UTF-8 is recommended and
the only one required to be supported. Non-UTF-8 characters
are an error.
json_encode({expr}) *json_encode()*
Convert {expr} into a JSON string. Accepts
|msgpack-special-dict| as the input. Converts from 'encoding'
@@ -4341,6 +4348,12 @@ json_encode({expr}) *json_encode()*
Non-printable characters are converted into "\u1234" escapes
or special escapes like "\t", other are dumped as-is.
Note: all characters above U+0079 are considered non-printable
when 'encoding' is not UTF-8. This function always outputs
UTF-8 strings as required by the standard thus when 'encoding'
is not unicode resulting string will look incorrect if
"\u1234" notation is not used.
keys({dict}) *keys()*
Return a |List| with all the keys of {dict}. The |List| is in
arbitrary order.

8
test/functional/eval/json_functions_spec.lua
View File

@@ -521,6 +521,14 @@ describe('json_decode() function', function()
local str = ('%s{%s"key"%s:%s[%s"val"%s,%s"val2"%s]%s,%s"key2"%s:%s1%s}%s'):gsub('%%s', s)
eq({key={'val', 'val2'}, key2=1}, funcs.json_decode(str))
end)
it('always treats input as UTF-8', function()
-- When &encoding is latin1 string "«" is U+00C2 U+00AB U+00C2: «Â. So if
-- '"«"' was parsed as latin1 json_decode would return three characters, and
-- only one U+00AB when this string is parsed as latin1.
restart('set encoding=latin1')
eq(('%c'):format(0xAB), funcs.json_decode('"«"'))
end)
end)
describe('json_encode() function', function()