validate error messages appear later as attributes in parsed JSON

[jeremystan]

When using jsonlite::validate on an invalid json character string, the resulting error message can appear later in the parsed JSON for valid false JSON data.

For example, when running this code:

library(jsonlite)
sessionInfo()
fromJSON('false') # This works just fine
validate('')      # Validate that '' is not valid JSON
fromJSON('false') # This now picks up the error message from validate('')
fromJSON('true')  # But this is fine

The output produced is:

> library(jsonlite)

Attaching package: ‘jsonlite’

The following object is masked from ‘package:utils’:

    View

Warning message:
package ‘jsonlite’ was built under R version 3.1.2
> sessionInfo()
R version 3.1.0 (2014-04-10)
Platform: x86_64-apple-darwin13.1.0 (64-bit)

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] jsonlite_0.9.13
> fromJSON('false') # This works just fine
[1] FALSE
> validate('')      # Validate that '' is not valid JSON
[1] FALSE
attr(,"err")
[1] "parse error: premature EOF\n                                       \n                     (right here) ------^\n"
> fromJSON('false') # This now picks up the error message from validate('')
[1] FALSE
attr(,"err")
[1] "parse error: premature EOF\n                                       \n                     (right here) ------^\n"
> fromJSON('true')  # But this is fine
[1] TRUE
>

[jeroen]

Thank you, confirmed.

[jeroen]

I pushed a fix at 0e929a5. Could you test if this completely solves the problem?

[jeroen]

FYI this was the problem: https://stat.ethz.ch/pipermail/r-devel/2014-October/070010.html

[jeremystan]

Confirmed, that commit resolved the specific issue above, and all tidyjson tests pass with validation turned back on.