anil.recoil.org
RFC6901 JSON Pointer implementation in OCaml using jsont
pp-error
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doc/tutorial.md
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doc/tutorial.md
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# open Jsont_pointer;;
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# #install_printer Jsont_pointer_top.printer;;
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# #install_printer Jsont_pointer_top.json_printer;;
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# #install_printer Jsont_pointer_top.error_printer;;
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# let parse_json s =
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match Jsont_bytesrw.decode_string Jsont.json s with
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| Ok json -> json
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```ocaml
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# of_string "foo";;
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Exception: Jsont.Error ([], <abstr>, <abstr>).
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Exception:
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Jsont.Error Invalid JSON Pointer: must be empty or start with '/': foo.
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```
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The RFC is strict: non-empty pointers MUST start with `/`.
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```ocaml
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# get_result (of_string "/nonexistent") rfc_example;;
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- : (Jsont.json, Jsont.Error.t) result = Error ([], <abstr>, <abstr>)
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- : (Jsont.json, Jsont.Error.t) result =
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Error JSON Pointer: member 'nonexistent' not found
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File "-":
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# find (of_string "/nonexistent") rfc_example;;
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- : Jsont.json option = None
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```