;+
;
; @file_comments
; Convert an input in a string.
;
; @categories 
; String
;
; @param INPUT {in}{required}
; input can not contain or be of the type of:
;
; Complex floating, structure, Double-precision complex, Pointer, Object
; reference, Unsigned Integer, Unsigned Longword Integer, 64-bit
; Integer, Unsigned 64-bit Integer	
;
; @returns
; a string
;
; @restrictions
; If keywdvalue is an array, it will be convert in a vector.
;
; @restrictions
; Beware, this function has loops, ifs and cases everywhere. So it can 
; not be used by big keywords (with a lot of elements which are big 
; arrays).
; 
; @examples
;   IDL> help, tostr(1),tostr('a'),tostr(indgen(4)),tostr(['a','jkfjo'])
;    <Expression>    STRING    = '1'
;    <Expression>    STRING    = ''a''
;    <Expression>    STRING    = '[0,1,2,3]'
;    <Expression>    STRING    = '['a','jkfjo']'
;   IDL> print, tostr(['c''est bon','c''est bon'])
;    ['c''est bon','c''est bon']
;
; @history
; Sebastien Masson (smasson\@lodyc.jussieu.fr)
;                      18/10/1999
;
; @version
; $Id$
;
;-
FUNCTION tostr, input
;
  compile_opt idl2, strictarrsubs
;

   case 1 of
      size(input, /type) LE 5:BEGIN 
         if size(input, /type) EQ 1 then input = long(input)
         if n_elements(input) EQ 1 then res = strtrim(input, 1) $
         ELSE BEGIN 
            res = '['+strtrim((input)[0], 1)
            for i = 1,  n_elements(input)-1 do res = res+','+strtrim((input)[i], 1)
            res = res+']'
         ENDELSE 
      END
      size(input, /type) eq 7:BEGIN 
         if n_elements(input) EQ 1 then BEGIN
            sinput = strrepl(input, '''', '''''')
            res = ''''+sinput+''''
         ENDIF ELSE BEGIN 
            res = '['''+strrepl(input[0], '''', '''''')+''''
            for i = 1,  n_elements(input)-1 do res = res+','''+strrepl(input[i], '''', '''''')+''''
            res = res+']'
         ENDELSE 
      END
      ELSE:BEGIN 
         ras = report('la fonction tostr ne marche pas pour input qui est de type '+size(input, /tname))
         res = ''
      END
   ENDCASE

   return, res
end