textlineformat.pro
6.55 KB
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;+
; NAME:
; TextLineFormat
;
; PURPOSE:
;
; This is a utility program for taking a line of text and shortening
; it to a defined maximum length. The result of the function is a string
; array in which no line of text in the string array is longer than the maximum
; length. The text is broken into "words" by white space. The algorithm is
; modified slightly if there are LF (line feeds) in the text, or if any single
; word in the text is too large to fit on a line.
;
; 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:
;
; formattedText = TextLineFormat(theText)
;
; INPUTS:
;
; theText: The line of text that is to be formatted.
;
; KEYWORDS:
;
; LENGTH: The maximum line length allowed in the resulting text array.
; Set to 60 characters by default. Lines greater than length
; can be permitted if Line Feeds (ASCII 10B) are found
; in the text or single words are too large to fit on a line.
;
; MODIFICATION HISTORY:
;
; Written by David Fanning, June 2005.
; Fixed a small problem with cumulative total not counting spaces between
; words. Changed the default size to 60. DWF. 18 August 2005.
; Added check for LF in text to accommodate reading netCDF file attributes.
; If LF are present, I break on these, and return. 15 Feb 2008. DWF.
; Better handling of lines with no white space in them for breaking. 23 March 2009. DWF.
;-
;
;******************************************************************************************;
; Copyright (c) 2008, 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 TEXTLINEFORMAT, theText, LENGTH=length
; Error handling.
Catch, theError
IF theError NE 0 THEN BEGIN
ok = cgErrorMsg()
RETURN, theText
ENDIF
; Check arguments.
IF N_Elements(theText) EQ 0 THEN Message, 'A line of text to format is required.'
IF Size(theText, /N_Dimensions) NE 0 THEN Message, 'The text line argument must be a scalar variable.'
IF N_Elements(length) EQ 0 THEN length = 60
; Make sure the text is not shorter than the maximum line length.
IF StrLen(theText) LE length THEN RETURN, theText
; Are there any Line Feeds (ASCII value 10) in the text? If so, I am going to
; assume the user did this intentionally, and split on these and return.
testSplit = StrSplit(theText, String(10B), /Preserve_Null, /Extract)
IF N_Elements(testSplit) GT 1 THEN BEGIN
RETURN, testSplit
ENDIF
; Set up formatted array and maxStrLen variable.
formattedText = [theText]
maxStrLen = StrLen(theText)
; Do until length of all strings are right.
WHILE maxStrLen GT length DO BEGIN
lastIndex = N_Elements(formattedText)-1
; Split the string at white space. First, get the length of each sub-string.
void = StrSplit(formattedText[lastIndex], /Preserve_Null, Length=len)
p = StrSplit(formattedText[lastIndex], /Preserve_Null, /Extract)
; If there is no white space. Just return.
IF N_Elements(p) EQ 1 THEN RETURN, formattedText
; Join the lines back together, increasing the size of the formatted
; text array by one each time.
cumLen = Total(len+1, /Cumulative)
cumLen[N_Elements(cumLen)-1] = cumLen[N_Elements(cumLen)-1] - 1
index = Value_Locate(cumLen, length)
IF index GE 0 THEN BEGIN
formattedText[lastIndex] = StrJoin(p[0:index],' ')
formattedText = [formattedText, StrJoin(p[index+1:*], ' ')]
ENDIF
; The word might be too big to fit on the line. If so, it goes on
; the next line, and I continue.
IF index LT 0 THEN BEGIN
formattedText[lastIndex] = p[0]
formattedText = [formattedText, StrJoin(p[1:*], ' ')]
ENDIF
maxStrLen = StrLen(formattedText[lastIndex + 1])
ENDWHILE
RETURN, formattedText
END