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module IO
exports all
definitions

-- 	Overture STANDARD LIBRARY: INPUT/OUTPUT
--      --------------------------------------------
-- 
-- Standard library for the Overture 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').
--
-- File path:
--  * An absolute path is accepted and used as specified.
--  * A relative path is relative to the debugger or if running in the 
--      Overture IDE relative to the project root.
--

types
 
/**
 * The file directive used in in/out functions.
 */
filedirective = | 

functions

sprintf : seq of char * seq of ? -> seq of char
sprintf(format,args) == is not yet specified;

/**
 * Write VDM value in ASCII format to the console.
 *
 * @param val the VDM value to be written
 * @return true if successful else false
 */
writeval[@p]: @p -> bool
writeval(val)==
  is not yet specified;

/**
 * Write VDM value in ASCII format to file. The type of the val must be
 * specified as fwriteval[seq of char](...) when calling the function.
 *
 * @param filename the name of the file
 * @param val the VDM value to be written.
 * @param fdir if  then it will overwrite an existing file, 
 *  else  will append output to the existing file
 * @return true if successful else false
 */
fwriteval[@p]:seq1 of char * @p * filedirective -> bool
fwriteval(filename,val,fdir) ==
  is not yet specified;

/**
 * Read VDM value in ASCII format from file. The type which should be read must be
 * specified as freadval[seq of char](...) when calling the function.
 *
 * @param filename the name of the file
 * @return mk_(success,@p) if successful success will be 
 * set to true else false. @p will hold nil if unsuccessful or the value read.
 */
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.
 *
 * @param text the text to write to the console
 * @return if successful true else false.
 */
echo: seq of char ==> bool
echo(text) ==
  fecho ("",text,nil);

/**
 * Write text to file like echo.
 *
 * @param filename the name of the file
 * @param text the text to write to be written.
 * @param fdir if nil or  then it will overwrite an existing file, 
 *  else  will append output to the existing file.
 * @return true if successful else false
 */
fecho: seq of char * seq of char * [filedirective] ==> bool
fecho (filename,text,fdir) ==
  is not yet specified
  pre filename = "" <=> fdir = nil;

/**
 * Returns the last error which may have occurred by any of the io/out functions
 *
 * @return the last error message
 */
ferror:()  ==> seq of char
ferror () ==
  is not yet specified;
  
-- New simplified format printing operations


/**
 * Prints any VDM value to the console
 *
 * @param arg a VDM value of any type
 */
print: ? ==> ()
print(arg) ==
    is not yet specified;

/**
 * Prints any VDM value to the console as a new line
 *
 * @param arg a VDM value of any type
 */
println: ? ==> ()
println(arg) ==
    is not yet specified;

/**
 * Prints any VDM value to the console
 *
 * @param format standard format string used in
 *  Java by String.format(format, value),
 *  though note that only the %s conversion is supported.
 *  eg. printf("Hello [%2$-5s][%1$5s]\n", [123, {2}])
 *  would produce Hello [{2}  ][  123] and a newline.
 *
 * @param arg a sequence of VDM values of any type
 */
printf: seq of char * seq of ? ==> ()
printf(format, args) ==
    is not yet specified;

end IO