Module Util.Json

Type of a read_ function as produced by atdgen -json.

In versions of yojson greater than 1.0.1, type Yojson.Safe.lexer_state is equivalent to Yojson.lexer_state, Yojson.Basic.lexer_state and Yojson.Raw.lexer_state.

type 'a writer = Bi_outbuf.t -> 'a -> unit

Type of a write_ function as produced by atdgen -json.

val from_lexbuf : ?⁠stream:bool -> 'a reader -> Yojson.Safe.lexer_state -> Stdlib.Lexing.lexbuf -> 'a

Read a JSON value from a lexbuf.

parameter stream

if true, the JSON parser will not try to consume whitespace until the end of file. Default is false, which raises a Yojson.Json_error exception if the valid JSON value is followed by anything other than standard JSON whitespace.

val from_string : ?⁠buf:Bi_outbuf.t -> ?⁠fname:string -> ?⁠lnum:int -> 'a reader -> string -> 'a

Convert a JSON value from a string.

parameter buf

buffer used to accumulate string data during the lexing phase.

parameter fname

input file name to be used in error messages. It does not have to be the name of a real file, it can be something like "<stdin>".

parameter lnum

line number to assign to the first line of input. For example lnum=10 means that an error on the first line of input will be reported as an error on line 10. Default: 1.

val from_channel : ?⁠buf:Bi_outbuf.t -> ?⁠fname:string -> ?⁠lnum:int -> 'a reader -> Stdlib.in_channel -> 'a

Read a JSON value from a channel.

parameter buf

buffer used to accumulate string data during the lexing phase.

parameter fname

input file name to be used in error messages. It does not have to be the name of a real file, it can be something like "<stdin>".

parameter lnum

line number to assign to the first line of input. For example lnum=10 means that an error on the first line of input will be reported as an error on line 10. Default: 1.

val from_file : ?⁠buf:Bi_outbuf.t -> ?⁠fname:string -> ?⁠lnum:int -> 'a reader -> string -> 'a

Read a JSON value from a channel.

parameter buf

buffer used to accumulate string data during the lexing phase.

parameter fname

input file name to be used in error messages. It is intended to represent the source file if it is different from the input file.

parameter lnum

line number to assign to the first line of input. For example lnum=10 means that an error on the first line of input will be reported as an error on line 10. Default: 1.

val stream_from_lexbuf : ?⁠fin:(unit -> unit) -> 'a reader -> Yojson.Safe.lexer_state -> Stdlib.Lexing.lexbuf -> 'a Stdlib.Stream.t

Read a stream of JSON values from a lexbuf.

parameter fin

finalization function executed once when the end of the stream is reached either because there is no more input or because of an exception. This is typically used to close the input channel, e.g. fun () -> close_in_noerr ic.

val stream_from_string : ?⁠buf:Bi_outbuf.t -> ?⁠fin:(unit -> unit) -> ?⁠fname:string -> ?⁠lnum:int -> 'a reader -> string -> 'a Stdlib.Stream.t

Read a stream of JSON values from a channel. Values do not have to be separated by newline characters.

parameter buf

buffer used to accumulate string data during the lexing phase.

parameter fin

finalization function executed once when the end of the stream is reached either because there is no more input or because of an exception. This is typically used to free the underlying resources, if any.

parameter fname

input file name to be used in error messages. It does not have to be the name of a real file, it can be something like "<stdin>".

parameter lnum

line number to assign to the first line of input. For example lnum=10 means that an error on the first line of input will be reported as an error on line 10. Default: 1.

val stream_from_channel : ?⁠buf:Bi_outbuf.t -> ?⁠fin:(unit -> unit) -> ?⁠fname:string -> ?⁠lnum:int -> 'a reader -> Stdlib.in_channel -> 'a Stdlib.Stream.t

Read a stream of JSON values from a channel. Values do not have to be separated by newline characters.

parameter buf

buffer used to accumulate string data during the lexing phase.

parameter fin

finalization function executed once when the end of the stream is reached either because there is no more input or because of an exception. This is typically used to close the input channel, e.g. fun () -> close_in_noerr ic.

parameter fname

input file name to be used in error messages. It does not have to be the name of a real file, it can be something like "<stdin>".

parameter lnum

line number to assign to the first line of input. For example lnum=10 means that an error on the first line of input will be reported as an error on line 10. Default: 1.

val stream_from_file : ?⁠buf:Bi_outbuf.t -> ?⁠fin:(unit -> unit) -> ?⁠fname:string -> ?⁠lnum:int -> 'a reader -> string -> 'a Stdlib.Stream.t

Read a stream of JSON values from a file. Values do not have to be separated by newline characters.

parameter buf

buffer used to accumulate string data during the lexing phase.

parameter fin

finalization function executed once when the end of the stream is reached either because there is no more input or because of an exception. This can be used to remove the input file if it was temporary, e.g. fun () -> Sys.remove fname.

parameter fname

input file name to be used in error messages. It is intended to represent the source file if it is different from the input file.

parameter lnum

line number to assign to the first line of input. For example lnum=10 means that an error on the first line of input will be reported as an error on line 10. Default: 1.

val list_from_string : ?⁠buf:Bi_outbuf.t -> ?⁠fin:(unit -> unit) -> ?⁠fname:string -> ?⁠lnum:int -> 'a reader -> string -> 'a list

Read a list of JSON values from a channel. Values do not have to be separated by newline characters.

parameter buf

buffer used to accumulate string data during the lexing phase.

parameter fin

finalization function executed once when the end of the stream is reached either because there is no more input or because of an exception. This is typically used to free the underlying resources, if any.

parameter fname

input file name to be used in error messages. It does not have to be the name of a real file, it can be something like "<stdin>".

parameter lnum

line number to assign to the first line of input. For example lnum=10 means that an error on the first line of input will be reported as an error on line 10. Default: 1.

val list_from_channel : ?⁠buf:Bi_outbuf.t -> ?⁠fin:(unit -> unit) -> ?⁠fname:string -> ?⁠lnum:int -> 'a reader -> Stdlib.in_channel -> 'a list

Read a list of JSON values from a channel. Values do not have to be separated by newline characters.

parameter buf

buffer used to accumulate string data during the lexing phase.

parameter fin

finalization function executed once when the end of the stream is reached either because there is no more input or because of an exception. This is typically used to close the input channel, e.g. fun () -> close_in_noerr ic.

parameter fname

input file name to be used in error messages. It does not have to be the name of a real file, it can be something like "<stdin>".

parameter lnum

line number to assign to the first line of input. For example lnum=10 means that an error on the first line of input will be reported as an error on line 10. Default: 1.

val list_from_file : ?⁠buf:Bi_outbuf.t -> ?⁠fname:string -> ?⁠lnum:int -> 'a reader -> string -> 'a list

Read a list of JSON values from a file. Values do not have to be separated by newline characters.

parameter buf

buffer used to accumulate string data during the lexing phase.

parameter fname

input file name to be used in error messages. It is intended to represent the source file if it is different from the input file.

parameter lnum

line number to assign to the first line of input. For example lnum=10 means that an error on the first line of input will be reported as an error on line 10. Default: 1.

val to_string : ?⁠len:int -> 'a writer -> 'a -> string

Write a JSON value to a string.

parameter len

output buffer length.

val to_channel : ?⁠len:int -> 'a writer -> Stdlib.out_channel -> 'a -> unit

Write a JSON value to a channel.

parameter len

output buffer length.

val to_file : ?⁠len:int -> 'a writer -> string -> 'a -> unit

Write a JSON value to a file.

parameter len

output buffer length.

val stream_to_string : ?⁠len:int -> ?⁠lf:string -> 'a writer -> 'a Stdlib.Stream.t -> string

Write a stream of values to a string.

parameter len

output buffer length.

parameter lf

additional element terminator. Default: "\n".

val stream_to_channel : ?⁠len:int -> ?⁠lf:string -> 'a writer -> Stdlib.out_channel -> 'a Stdlib.Stream.t -> unit

Write a stream of values to a channel.

parameter len

output buffer length.

parameter lf

additional element terminator. Default: "\n".

val stream_to_file : ?⁠len:int -> ?⁠lf:string -> 'a writer -> string -> 'a Stdlib.Stream.t -> unit

Write a stream of values to a file.

parameter len

output buffer length.

parameter lf

additional element terminator. Default: "\n".

val list_to_string : ?⁠len:int -> ?⁠lf:string -> 'a writer -> 'a list -> string

Write a list of values to a string.

parameter len

output buffer length.

parameter lf

additional element terminator. Default: "\n".

val list_to_channel : ?⁠len:int -> ?⁠lf:string -> 'a writer -> Stdlib.out_channel -> 'a list -> unit

Write a list of values to a channel.

parameter len

output buffer length.

parameter lf

additional element terminator. Default: "\n".

val list_to_file : ?⁠len:int -> ?⁠lf:string -> 'a writer -> string -> 'a list -> unit

Write a list of values to a file.

parameter len

output buffer length.

parameter lf

additional element terminator. Default: "\n".

val preset_unknown_field_handler : string -> string -> unit

preset_unknown_field_handler src_loc field_name raises a Failure exception with a message containing the location of the type definition in the source ATD file (src_loc) and the name of the field (field_name).

val unknown_field_handler : (string -> string -> unit) Stdlib.ref

Function called when an unknown JSON field is encountered if the code was generated by atdgen -json-strict-fields. Its preset behavior is to call preset_unknown_field_handler which raises a Failure exception.

Usage: !Atdgen_runtime.Util.Json.unknown_field_handler src_loc field_name where src_loc is the location of the type definition in the source ATD file and field_name is the unknown JSON field name.