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ANY2ANY.PRG
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1991-08-16
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/*
* File......: Any2Any.Prg
* Author....: David Husnian
* Date......: $Date: 15 Aug 1991 23:02:46 $
* Revision..: $Revision: 1.2 $
* Log file..: $Logfile: E:/nanfor/src/any2any.prv $
*
* This is an original work by David Husnian and is placed in the
* public domain.
*
* Modification history:
* ---------------------
*
* $Log: E:/nanfor/src/any2any.prv $
*
* Rev 1.2 15 Aug 1991 23:02:46 GLENN
* Forest Belt proofread/edited/cleaned up doc
*
* Rev 1.1 14 Jun 1991 19:50:54 GLENN
* Minor edit to file header
*
* Rev 1.0 01 Apr 1991 01:00:34 GLENN
* Nanforum Toolkit
*
*/
/* $DOC$
* $FUNCNAME$
* FT_XTOY()
* $CATEGORY$
* Conversion
* $ONELINER$
* Convert from any data type to any other data type
* $SYNTAX$
* FT_XTOY( <xValueToConvert>, <cTypeToConvertTo> ;
* [, <lWantYesNo> ] ) -> xResult
* $ARGUMENTS$
* <xValueToConvert> is the value to convert.
*
* <cTypeToConvertTo> is the type of value to convert to
* ("C","D","L","N","A" or "B").
*
* <lWantYesNo> is a logical to signal if 'Y' or 'N' is to be returned
* if Converting a logical, otherwise '.T.' or '.F.' will be returned
* for logicals.
* $RETURNS$
* The original value converted to the new type.
* $DESCRIPTION$
* This function converts a value of character, date, numeric, logical,
* array or code block type to any of the other type. While it is
* guaranteed to return a value of the correct type, that value may not
* be meaningful (i.e., converting from a code block returns an EMPTY()
* value of the desired type).
* $EXAMPLES$
* nNumericValue := FT_XTOY(cInputValue, "N")
* IF (FT_XTOY(nInputValue, "L"))
* $END$
*/
#define BLOCKIFY(x) { || x }
#define IS_CHAR(x) (VALTYPE(x) == "C")
#define IS_DATE(x) (VALTYPE(x) == "D")
#define IS_LOGICAL(x) (VALTYPE(x) == "L")
#define IS_NUMERIC(x) (VALTYPE(x) == "N")
#define CASE_AT(x,y,z) z[AT(x,y)+1]
#define TRIM_NUMBER(x) LTRIM(STR(x))
#define NULL ""
#define IS_NOT_CHAR(x) (VALTYPE(x) != "C")
#define IS_NOT_DATE(x) (VALTYPE(x) != "D")
#define EARLIEST_DATE CTOD("01/01/0100")
#define BLANK_DATE CTOD(NULL)
#define IS_NOT_ARRAY(x) (VALTYPE(x) != "A")
#define IS_NOT_LOGICAL(x) (VALTYPE(x) != "L")
#define IS_NOT_NUMERIC(x) (VALTYPE(x) != "N")
#define IS_NOT_CODE_BLOCK(x) (VALTYPE(x) != "B")
#define TRUE (.t.)
#define FALSE (.f.)
#Define XTOC(x) CASE_AT(VALTYPE(x), "CNDLM", ;
{ NULL, ;
x, ;
IF(IS_NUMERIC(x),;
TRIM_NUMBER(x), ;
NULL), ;
IF(IS_DATE(x),DTOC(x),NULL),;
IF(IS_LOGICAL(x),;
IF(x,".T.",".F."), ;
NULL), ;
x })
#command DEFAULT <Param1> TO <Def1> [, <ParamN> TO <DefN> ] ;
=> ;
<Param1> := IF(<Param1> == NIL,<Def1>,<Param1>) ;
[; <ParamN> := IF(<ParamN> == NIL,<DefN>,<ParamN>)]
FUNCTION FT_XTOY(xValueToConvert, cTypeToConvertTo, lWantYesNo)
DEFAULT lWantYesNo TO FALSE
DO CASE
CASE cTypeToConvertTo == "C" .AND.; // They Want a Character String
IS_NOT_CHAR(xValueToConvert)
xValueToConvert := XTOC(xValueToConvert)
CASE cTypeToConvertTo == "D" .AND.; // They Want a Date
IS_NOT_DATE(xValueToConvert)
xValueToConvert := IF(IS_CHAR(xValueToConvert), ;
; // Convert from a Character
CTOD(xValueToConvert), ;
IF(IS_NUMERIC(xValueToConvert), ;
; // Convert from a Number
xValueToConvert + EARLIEST_DATE, ;
IF(IS_LOGICAL(xValueToConvert), ;
; // Convert from a Logical
IF(xValueToConvert, DATE(), BLANK_DATE), ;
; // Unsupported Type
BLANK_DATE)))
CASE cTypeToConvertTo == "N" .AND.; // They Want a Number
IS_NOT_NUMERIC(xValueToConvert)
xValueToConvert := IF(IS_CHAR(xValueToConvert), ;
; // Convert from a Character
VAL(xValueToConvert), ;
IF(IS_DATE(xValueToConvert), ;
; // Convert from a Date
xValueToConvert - EARLIEST_DATE, ;
IF(IS_LOGICAL(xValueToConvert), ;
; // Convert from a Logical
IF(xValueToConvert, 1, 0), ;
; // Unsupported Type
0)))
CASE cTypeToConvertTo == "L" .AND.; // They Want a Logical
IS_NOT_LOGICAL(xValueToConvert)
xValueToConvert := IF(IS_CHAR(xValueToConvert), ;
; // Convert from a Character
UPPER(xValueToConvert) == IF(lWantYesNo,"Y",".T."), ;
IF(IS_DATE(xValueToConvert), ;
; // Convert from a Date
! EMPTY(xValueToConvert), ;
IF(IS_NUMERIC(xValueToConvert), ;
; // Convert from a Number
xValueToConvert != 0, ;
; // Unsupported Type
FALSE)))
CASE cTypeToConvertTo == "A" .AND.; // They Want an Array
IS_NOT_ARRAY(xValueToConvert)
xValueToConvert := { xValueToConvert }
CASE cTypeToConvertTo == "B" .AND.; // They Want a Code Block
IS_NOT_CODE_BLOCK(xValueToConvert)
xValueToConvert := BLOCKIFY(xValueToConvert)
ENDCASE
RETURN (xValueToConvert) // XToY