Gerbil Scheme

JSON

To use the bindings from this module:

(import :std/text/json)

read-json

(read-json [input = (current-input-port)]) -> json | error

  input := input source to read JSON data

Returns JSON object from given input source. Signals an error if fails to parse JSON

The input source can be:

  • An input port.
  • A BufferedStringReader.
  • A BufferedReader.

write-json

(write-json obj [sink = (current-output-port)]) -> void | error

  obj  := JSON object
  sink := output sink to write JSON data

Writes JSON object obj optionally given port. Defaults to using current-output-port. Signals an error on failed write.

The output sink can be:

  • An output port.
  • A BufferedStringWriter.
  • A BufferedWriter.
  • A StringWriter.
  • A Writer.

string->json-object

(string->json-object str) -> json | error

  str := a string of JSON data

Parses given str and returns JSON object or signals an error fails to parse.

json-object->string

(json-object->string obj) -> string | error

  obj := JSON object

Returns a newly allocated string with JSON object as a string. Signals an error if fails to parse JSON.

json-symbolic-keys

json-symbolic-keys

Boolean parameter to control should decoded hashes have symbols as keys? Defaults to #t. #f means that keys will be strings.

Examples

> (hash->list (string->json-object "{\"a\":1}"))
((a . 1))

> (parameterize ((json-symbolic-keys #f))
    (hash->list (string->json-object "{\"a\":1}")))
(("a" . 1))

json-list-wrapper

json-list-wrapper

Parameter to control how JSON lists should be transformed. Defaults to identity, which means keep them as lists. If bound to list->vector then JSON lists will be parsed as vectors.

Examples

> (string->json-object "[\"a\",1]")
("a" 1)

> (parameterize ((json-list-wrapper list->vector))
    (string->json-object "[\"a\",1]"))
#("a" 1)

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