cafeexecparse

           parses a command line, returns a string list which contains
           all items of a command line, usually separated with ",".

           CAFE

           execlist=CAFEEXECPARSE(execstr[,separator=separator])

           execstr   -  string to split into its components. Will be
                        empty after call.

           separator - character (or string) which separates the
                       different items. Default: ','.

           /keep     - if set do not change (destroy) the input exec
                       string.

           A exec string list of items which are logically
           separated (usually via "," as the IDL command line syntax).
           Thus this function works like STRSPLIT(execstr,",") but
           parentheses and string marks are acknowledged.

           This procedure is called recursively and gets tokens from
           str which will change by subtracting the model tokens
           (models, operators etc).
           THE execstr WILL BE EMPTY AFTER CALLING THIS FUNCTION!!!

           $Id: cafeexecparse.pro,v 1.7 2005/01/04 10:56:05 goehler Exp $
 $Log: cafeexecparse.pro,v $
 Revision 1.7  2005/01/04 10:56:05  goehler
 fix: make shure all (internal) routines are properly documented
 Revision 1.6  2004/06/21 17:22:33  goehler
 fix: do not force all quotings to '' but keep proper use of ""
 Revision 1.5  2004/06/14 17:36:01  goehler
 fix: proper quoting using '' instead ""
 Revision 1.4  2003/10/04 23:38:49  goehler
 /keep keyword to not destroy input string
 Revision 1.3  2003/05/15 15:50:32  goehler
 trim string when performing %expr% expansion
 Revision 1.2  2003/05/13 08:15:54  goehler
 added %expression% expansion
 Revision 1.1  2003/02/17 17:26:09  goehler
 Change: now really parsing the input line (avoid ";")

 exprlist = expr "," expr  | expr;
 expr     = item
            | "(" exprlist ")"
            | '"' string    '"'
            | "[" exprlist "]";
 item     = item CHAR | EMPTY ;
 string   = ANYNONSTRINGCHAR string | EMPTY;

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