matchdelim.pro
5.17 KB
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;
;+
; NAME:
; MATCHDELIM
; PURPOSE:
; Match open/close delimiters in a string.
; CATEGORY:
; text/strings
; CALLING SEQUENCE:
; position = matchdelim( strn, [openpos])
; INPUTS:
; strn -- a string containing an open in
; delimiter (e.g. '{') in which you
; want to find the matching closing
; delimiter (e.g. '}')
; KEYWORD PARAMETERS:
; OPEN_DELIM -- A single character containing the opening in
; delimiter (e.g. '('). Default is '{'
; CLOSE_DELIM -- A single character containing the closing in
; delimiter (e.g. ')'). Default is '}'
; OUTPUTS:
; position -- returns the position in strn of the out
; closing delimiter, -1 if no closing found.
; openpos -- Set to a named variable to receive the out
; position of the first opening delimiter.
; Optional.
; COMMON BLOCKS:
; SIDE EFFECTS:
; NOTES:
; - Any pair of (nonidentical) characters can be used as
; delimiters.
; EXAMPLE:
; matchdelim('{one{two}}three') returns 9, the character just
; before 'three'.
; MODIFICATION HISTORY:
; $Id: matchdelim.pro,v 1.3 1996/06/14 20:00:27 mcraig Exp $
; $Log: matchdelim.pro,v $
; Revision 1.3 1996/06/14 20:00:27 mcraig
; Updated Copyright info.
;
; Revision 1.2 1996/05/09 00:22:17 mcraig
; Removed restriction that open delim must be first char. Added argument
; to allow for return of position of open delim.
;
; Revision 1.1 1996/01/31 18:41:06 mcraig
; Initial revision
;
; RELEASE:
; $Name: Rel_2_1 $
;
; COPYRIGHT:
; Copyright (C) 1996 The Regents of the University of California, All
; Rights Reserved. Written by Matthew W. Craig.
; See the file COPYRIGHT for restrictions on distrubting this code.
; This code comes with absolutely NO warranty; see DISCLAIMER for details.
;-
;
FUNCTION Matchdelim, InString, OpenPos, $
OPEN_DELIM=OpenDelim, $
CLOSE_DELIM=CloseDelim, $
HELP=Help
; Return to caller if error.
On_error, 2
IF (n_params() LT 1) OR keyword_set(Help) THEN BEGIN
offset = ' '
print, offset+'Match open/close delimiters in a string.'
print, offset+'position = matchdelim( strn, [openpos])'
print, offset+'Inputs:'
print, offset+offset+'strn -- a string containing an open in'
print, offset+offset+" delimiter (e.g. '{') in which you "
print, offset+offset+' want to find the matching closing '
print, offset+offset+" delimiter (e.g. '}')"
print, offset+'Keywords:'
print, offset+offset+'OPEN_DELIM -- A single character containing the opening in'
print, offset+offset+" delimiter (e.g. '('). Default is '{'"
print, offset+offset+'CLOSE_DELIM -- A single character containing the closing in'
print, offset+offset+" delimiter (e.g. ')'). Default is '}'"
print, offset+'Outputs:'
print, offset+offset+'position -- returns the position in strn of the out'
print, offset+offset+' closing delimiter, -1 if no closing found.'
print, offset+offset+'openpos -- Set to a named variable to receive the out'
print, offset+offset+' position of the first opening delimiter.'
print, offset+offset+' Optional.'
print, offset+'Example:'
print, offset+offset+"matchdelim('a{one{two}}three') returns 10, the character just"
print, offset+offset+" before 'three'. "
print, offset+offset+$
"a=matchdelim('aaa[bbb(ccc)]ddd[eee]',f,OP='[',CL=']')"
print, offset+offset+" returns a=12 (just before ddd), f=3 "+$
"(just before bbb)."
return, -1
ENDIF
; Set default delimiters.
IF n_elements(OpenDelim) EQ 0 THEN OpenDelim = '{'
IF n_elements(CloseDelim) EQ 0 THEN CloseDelim = '}'
; Make sure InString has more than 1 character.
length = strlen(InString)
IF (length LE 1) THEN return,-1
; Return if no open delimiter
OpenPos = strpos( InString, OpenDelim )
IF (OpenPos EQ -1) THEN BEGIN
print, 'Error: No opening delimiter'
return, -1
ENDIF
; Convert strings to array of integers to speed processing.
OpenDelim = fix((byte(OpenDelim))(0))
CloseDelim = fix((byte(CloseDelim))(0))
TmpStr = fix(byte(strmid( InString, OpenPos, length)))
; Leave the -1* in here. This forces conversion from BYTE to INTEGER,
; necessary because there are no negative BYTEs.
TmpStr = (TmpStr EQ OpenDelim) $
-1*(TmpStr EQ CloseDelim)
length = n_elements(TmpStr)
; Initialize count of number of delimiters. We've found one, the
; first opener.
BraceCnt = 1
i=0
WHILE (BraceCnt GT 0) AND (i LT length-1) DO BEGIN
i = i+1
BraceCnt = BraceCnt + TmpStr(i)
ENDWHILE
i = i + OpenPos
IF (BraceCnt GT 0) THEN i = -1
return, i
END