jsonpatPos.ml

(*
  Copyright (c) 2010, Mylife.com
  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are
  met:
        
  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.

  2. 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.

  3. Neither the name of Mylife.com nor the names of
     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.
*)

exception Syntax_error

let file = ref ""
let line = ref 1
let offset = ref 0

let newline lexbuf = 
  offset := Lexing.lexeme_end lexbuf ;
  incr line 

let print_error lexbuf = 
  let start = Lexing.lexeme_start lexbuf in
  let end_ = Lexing.lexeme_end lexbuf in
  let w = Lexing.lexeme lexbuf in
  let start = start - !offset in
  let end_ = end_ - !offset in
  Printf.fprintf 
    stderr 
    "File \"%s\", line %d, character %d-%d:\nSyntax error" 
    !file !line start end_ ;
  output_string stderr (if w = "" then "\n" else " on "^w^"\n")

let syntax_error lexbuf = 
  print_error lexbuf ;
  raise Syntax_error


let file s = file := s