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|
;+
; NAME:
; CONVERT_TO_TYPE
;
; PURPOSE:
;
; Converts its input argument to a specified data type.
;
; AUTHOR:
;
; FANNING SOFTWARE CONSULTING
; David Fanning, Ph.D.
; 1645 Sheely Drive
; Fort Collins, CO 80526 USA
; Phone: 970-221-0438
; E-mail: david@idlcoyote.com
; Coyote's Guide to IDL Programming: http://www.idlcoyote.com
;
; CATEGORY:
;
; Utilities
;
; CALLING SEQUENCE:
;
; result = Convert_To_Type(input, type)
;
; INPUT_PARAMETERS:
;
; input: The input data to be converted.
; type: The data type. Accepts values as given by Size(var, /TNAME) or Size(var, /TYPE).
; If converting to integer types, values are truncated (similar to FLOOR keyword below),
; unless keywords are set.
;
; OUTPUT_PARAMETERS:
;
; result: The input data is converted to specified data type.
;
; KEYWORDS:
;
; CEILING: If set and converting to an integer type, the CEIL function is applied before conversion.
;
; FLOOR: If set and converting to an integer type, the FLOOR function is applied before conversion.
;
; ROUND: If set and converting to an integer type, the ROUND function is applied before conversion.
;
;
; RESTRICTIONS:
;
; Data types STRUCT, POINTER, and OBJREF are not allowed.
;
; MODIFICATION HISTORY:
;
; Written by David W. Fanning, 19 February 2006.
; Typo had "UNIT" instead of "UINT". 23 February 2009. DWF.
; Added CEILING, FLOOR, and ROUND keywords. 1 April 2009. DWF.
; Modified so that the "type" variable is not changed by the program. 5 May 2009. DWF.
;-
;******************************************************************************************;
; Copyright (c) 2008-2009, by Fanning Software Consulting, Inc. ;
; All rights reserved. ;
; ;
; Redistribution and use in source and binary forms, with or without ;
; modification, are permitted provided that the following conditions are met: ;
; ;
; * Redistributions of source code must retain the above copyright ;
; notice, this list of conditions and the following disclaimer. ;
; * 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. ;
; * Neither the name of Fanning Software Consulting, Inc. nor the names of its ;
; contributors may be used to endorse or promote products derived from this ;
; software without specific prior written permission. ;
; ;
; THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''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 FANNING SOFTWARE CONSULTING, INC. 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; ;
; 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. ;
;******************************************************************************************;
FUNCTION Convert_To_Type, input, theType, $
CEILING=ceiling, $
FLOOR=floor, $
ROUND=round
; Return to caller on error.
On_Error, 2
; Two positional parameters are required.
IF N_Params() NE 2 THEN Message, 'Two input parameters (INPUT and TYPE) are required.'
; If type is a string, turn it into a number.
IF Size(theType, /TNAME) EQ 'STRING' THEN BEGIN
type = StrUpCase(theType[0])
CASE type OF
'BYTE': type = 1
'INT': type = 2
'LONG': type = 3
'FLOAT': type = 4
'DOUBLE': type = 5
'COMPLEX': type = 6
'STRING': type = 7
'DCOMPLEX': type = 9
'UINT': type = 12
'ULONG': type = 13
'LONG64': type = 14
'ULONG64': type = 15
ELSE: Message, 'Unable to convert input to type: ' + StrUpCase(theType)
ENDCASE
ENDIF ELSE BEGIN
; Only certain kinds of data conversions can occur.
type = theType[0]
CASE 1 OF
(type LT 1): Message, 'Unable to convert input to UNDEFINED data type.'
(type EQ 8): Message, 'Unable to convert input to STRUCTURE data type.'
(type EQ 10): Message, 'Unable to convert input to POINTER data type.'
(type EQ 11): Message, 'Unable to convert input to OBJECT data type.'
(type GT 15): Message, 'Unable to convert undefined data type: ' + StrTrim(theType) + '.'
ELSE:
ENDCASE
ENDELSE
; Do the conversion.
CASE type OF
1: BEGIN
CASE 1 OF
Keyword_Set(ceiling): output = BYTE(CEIL(input))
Keyword_Set(round): output = BYTE(ROUND(input))
Keyword_Set(floor): output = BYTE(FLOOR(input))
ELSE: output = BYTE(input)
ENDCASE
END
2: BEGIN
CASE 1 OF
Keyword_Set(ceiling): output = FIX(CEIL(input))
Keyword_Set(round): output = FIX(ROUND(input))
Keyword_Set(floor): output = FIX(FLOOR(input))
ELSE: output = FIX(input)
ENDCASE
END
3: BEGIN
CASE 1 OF
Keyword_Set(ceiling): output = LONG(CEIL(input))
Keyword_Set(round): output = LONG(ROUND(input))
Keyword_Set(floor): output = LONG(FLOOR(input))
ELSE: output = LONG(input)
ENDCASE
END
4: output = FLOAT(input)
5: output = DOUBLE(input)
6: output = COMPLEX(input)
7: output = STRING(input)
9: output = DCOMPLEX(input)
12: BEGIN
CASE 1 OF
Keyword_Set(ceiling): output = UINT(CEIL(input))
Keyword_Set(round): output = UINT(ROUND(input))
Keyword_Set(floor): output = UINT(FLOOR(input))
ELSE: output = UINT(input)
ENDCASE
END
13: BEGIN
CASE 1 OF
Keyword_Set(ceiling): output = ULONG(CEIL(input))
Keyword_Set(round): output = ULONG(ROUND(input))
Keyword_Set(floor): output = ULONG(FLOOR(input))
ELSE: output = ULONG(input)
ENDCASE
END
14: BEGIN
CASE 1 OF
Keyword_Set(ceiling): output = LONG64(CEIL(input))
Keyword_Set(round): output = LONG64(ROUND(input))
Keyword_Set(floor): output = LONG64(FLOOR(input))
ELSE: output = LONG64(input)
ENDCASE
END
15: BEGIN
CASE 1 OF
Keyword_Set(ceiling): output = ULONG64(CEIL(input))
Keyword_Set(round): output = ULONG64(ROUND(input))
Keyword_Set(floor): output = ULONG64(FLOOR(input))
ELSE: output = ULONG64(input)
ENDCASE
END
ENDCASE
RETURN, output
END
|
