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-- @NoPOG - do not generate obligations for this class
class IO

-- 	VDMTools STANDARD LIBRARY: INPUT/OUTPUT
--      --------------------------------------------
-- 
-- Standard library for the VDMTools Interpreter. When the interpreter
-- evaluates the preliminary functions/operations in this file,
-- corresponding internal functions is called instead of issuing a run
-- time error. Signatures should not be changed, as well as name of
-- module (VDM-SL) or class (VDM++). Pre/post conditions is 
-- fully user customisable. 
-- Dont care's may NOT be used in the parameter lists.
--
-- The in/out functions  will return false if an error occurs. In this
-- case an internal error string will be set (see 'ferror').

types
 
public
filedirective = | 

functions

-- Write VDM value in ASCII format to std out:
public
writeval[@p]: @p -> bool
writeval(val)==
  is not yet specified;

-- Write VDM value in ASCII format to file.
-- fdir =  will overwrite existing file,
-- fdir =  will append output to the file (created if
-- not existing).
public
fwriteval[@p]:seq1 of char * @p * filedirective -> bool
fwriteval(filename,val,fdir) ==
  is not yet specified;

-- Read VDM value in ASCII format from file
public
freadval[@p]:seq1 of char -> bool * [@p]
freadval(filename) ==
  is not yet specified
  post let mk_(b,t) = RESULT in not b => t = nil;

operations

-- Write text to std out. Surrounding double quotes will be stripped,
-- backslashed characters should be interpreted.
public
echo: seq of char ==> bool
echo(text) ==
  fecho ("",text,nil);

-- Write text to file like 'echo'
public
fecho: seq of char * seq of char * [filedirective] ==> bool
fecho (filename,text,fdir) ==
  is not yet specified
  pre filename = "" <=> fdir = nil;

-- The in/out functions  will return false if an error occur. In this
-- case an internal error string will be set. 'ferror' returns this
-- string and set it to "".
public
ferror:()  ==> seq of char
ferror () ==
  is not yet specified;
  
-- New simplified format printing operations

public static print: ? ==> ()
print(arg) ==
	is not yet specified;

public static println: ? ==> ()
println(arg) ==
	is not yet specified;

public static printf: seq of char * seq of ? ==> ()
printf(format, args) ==
	is not yet specified;

end IO