Convert buffered JSON objects To R

Convert a collection of JSON objects into R objects.

Usage

newJSONParser(method = "R")

Arguments

method

use the C implementation, or the slower original R implementation

Value

A list of functions used for parsing objects

See also

toJSON

Examples

sample_json <- '
  {
    "breakfast" : [ "milk", "fruit loops", "juice" ],
    "lunch" : [ "left over sushi" ]
  }
'

parser <- newJSONParser()

parser$addData( sample_json )
food <- parser$getObject()
print( food )
#> $breakfast
#> [1] "milk"        "fruit loops" "juice"      
#> 
#> $lunch
#> [1] "left over sushi"
#> 

#This is equivalent to using FromJSON( sample_json )
#However, sample_json can be split into several parts:

### EXAMPLE 2:

part_1 <- '{ "breakfast" : [ "milk", "fruit loops", "juice" ], '
part_2 <- '"lunch" : [ "left over sushi" ]'
# close off the first object, and create a 2nd JSON object, which is simply an 
# array
part_3 <- '} [1,2,3,4,5]' 

parser <- newJSONParser()
parser$addData( part_1 )
parser$getObject() #returns NULL - since part_1 isn't complete
#> NULL
parser$addData( part_2 )
parser$getObject() #returns NULL - since part_2 still isn't complete
#> NULL
parser$addData( part_3 )
parser$getObject() #returns the first food object
#> $breakfast
#> [1] "milk"        "fruit loops" "juice"      
#> 
#> $lunch
#> [1] "left over sushi"
#> 
parser$getObject() #returns the second array
#> [1] 1 2 3 4 5