RJSONIO: Serialize R objects to JSON, JavaScript Object Notation
RオブジェクトとJSONの取り扱い
> library(RJSONIO)
バージョン: 1.3.0
| 関数名 | 概略 |
|---|---|
JSON_T_ARRAY_BEGIN |
Symbolic constants identifying the type of a JSON value. |
asJSVars |
Serialize R objects as Javsscript/ActionScript variables |
basicJSONHandler |
Create handler for processing JSON elements from a parser |
fromJSON |
Convert JSON content to R objects |
isValidJSON |
Test if JSON content is valid |
readJSONStream |
Read JSON from a Connection/Stream |
toJSON |
Convert an R object to a string in Javascript Object Notation |
basicJSONHandler
> h <- basicJSONHandler()
> x <- fromJSON("[1, 2, 3]", h)
> x
[[1]]
[1] 1
[[2]]
[1] 2
[[3]]
[1] 3
> h$value()
[[1]]
[1] 1
[[2]]
[1] 2
[[3]]
[1] 3
fromJSON
JSON形式の読み込み
ref) rjson::fromJSON(), jsonlite::fromJSON()
Arguments
- content
- handler
- default.size
- depth
- allowComments
- asText
- data
- maxChar
- simplify
- nullValue
- simplifyWithNames
- encoding
- ...
- stringFun
> fromJSON(I(toJSON(1:10)))
[1] 1 2 3 4 5 6 7 8 9 10
> fromJSON('{"ok":true,"id":"x123","rev":"1-1794908527"}')
$ok
[1] TRUE
$id
[1] "x123"
$rev
[1] "1-1794908527"
isValidJSON
JSONが適切な構文であるかを評価する
ref) jsonlite::validate()
Arguments
- content
- asText
- ...
> isValidJSON(content = I('{"foo" : "bar"}'))
[1] TRUE
> isValidJSON('{foo : "bar"}', TRUE)
[1] FALSE
readJSONStream
> readJSONStream(con,
+ cb = NULL,
+ simplify = Strict,
+ nullValue = NULL,
+ simplifyWithNames = TRUE)
toJSON
ref) rjson::toJSON(), jsonlite::toJSON()
> toJSON(1:10)
[1] "[ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]"
> toJSON(rnorm(3), digits = 4)
[1] "[ 0.2144, -0.3247, 0.09458 ]"