The R Project SVN R-packages

Rev

Details | Last modification | View Log | RSS feed

Rev Author Line No. Line
7747 ripley 1 
\name{basicJSONHandler}
2 
\alias{basicJSONHandler}
3 
\title{Create handler for processing JSON elements from a parser}
4 
\description{
5 
 This function creates a handler object that is used to
6 
 consume tokens/elements from a JSON parser and combine
7 
 them into R objects.
8 
 
9 
 This is  slow relative to using C code because  this is done
10 
 in R and also we don't know the length of each object until
11 
 we have consumed all its elements.
12 
}
13 
\usage{
14 
basicJSONHandler(default.size = 100, simplify = FALSE)
15 
}
16 
\arguments{
17 
  \item{default.size}{the best guess as to the sizes of the different elements. This is used
18 
   for preallocating space for elements}
19 
  \item{simplify}{a logical value indicating whether to simplify arrays
20 
   from lists to vectors if the elements are of compatible types.}
21 
}
22 
\value{
23 
  \item{update}{a function called with a JSON element and used to process that element and add it to the relevant R object}
24 
  \item{value}{a function to retrieve the result after  processing the JSON}
25 
}
26 
%\references{}
27 
\author{
28 
Duncan Temple Lang
29 
}
30 
 
31 
\seealso{
32 
 \code{\link{fromJSON}} and the handler argument.
33 
}
34 
\examples{
35 
  h = basicJSONHandler()
36 
  x = fromJSON("[1, 2, 3]", h)
37 
  x
38 
  h$value()
39 
}
40 
\keyword{IO}
41 
\keyword{programming}