Source file YojsonCommon.ml

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(*
Copyright (c) 2010-2012, Martin Jambon
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
 * Neither the name of  nor the names of its contributors may be used to
   endorse or promote products derived from this software without specific
   prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.

----

Vendored!

MlFront_Thunk has its own JSON parsing for nice error handling.
Yojson has pretty printing.

Edits:
- Removed .mli unless necessary, and everything except [Safe] printing.
- Prefixed modules with "Yojson", with aliases using `open struct ... end`.
- Code formatted.
 *)

let version = "3.0.0"

exception Json_error of string

let json_error s = raise (Json_error s)

exception End_of_array
exception End_of_object
exception End_of_input

type lexer_state = {
  buf : Buffer.t; (* Buffer used to accumulate substrings *)
  mutable lnum : int; (* Current line number (starting from 1) *)
  mutable bol : int;
      (* Absolute position of the first character of the current line
         (starting from 0) *)
  mutable fname : string option; (* Name describing the input file *)
}

module Lexer_state = struct
  type t = lexer_state = {
    buf : Buffer.t;
    mutable lnum : int;
    mutable bol : int;
    mutable fname : string option;
  }
end

let init_lexer ?buf ?fname ?(lnum = 1) () =
  let buf = match buf with None -> Buffer.create 256 | Some buf -> buf in
  { buf; lnum; bol = 0; fname }