05-26-2011
Well, usually we use the PERL sax parser modules not home brew! They call you as tags are opened and closed, so you can deal with attributes and content.
Make an array string variable I_AM_IN and a depth integer variable xml_depth to index it, and keep track of where you are. Use them in debug or error log messages, presented as: /$I_AM_IN[0]/$I_AM_IN[1] . . .
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LEARN ABOUT OPENSOLARIS
lset
lset(1T) Tcl Built-In Commands lset(1T)
__________________________________________________________________________________________________________________________________________________
NAME
lset - Change an element in a list
SYNOPSIS
lset varName ?index...? newValue
_________________________________________________________________
DESCRIPTION
The lset command accepts a parameter, varName, which it interprets as the name of a variable containing a Tcl list. It also accepts zero
or more indices into the list. The indices may be presented either consecutively on the command line, or grouped in a Tcl list and pre-
sented as a single argument. Finally, it accepts a new value for an element of varName.
If no indices are presented, the command takes the form:
lset varName newValue
or
lset varName {} newValue
In this case, newValue replaces the old value of the variable varName.
When presented with a single index, the lset command treats the content of the varName variable as a Tcl list. It addresses the index'th
element in it (0 refers to the first element of the list). When interpreting the list, lset observes the same rules concerning braces and
quotes and backslashes as the Tcl command interpreter; however, variable substitution and command substitution do not occur. The command
constructs a new list in which the designated element is replaced with newValue. This new list is stored in the variable varName, and is
also the return value from the lset command.
If index is negative or greater than or equal to the number of elements in $varName, then an error occurs.
If index has the value end, it refers to the last element in the list, and end-integer refers to the last element in the list minus the
specified integer offset.
If additional index arguments are supplied, then each argument is used in turn to address an element within a sublist designated by the
previous indexing operation, allowing the script to alter elements in sublists. The command,
lset a 1 2 newValue
or
lset a {1 2} newValue
replaces element 2 of sublist 1 with newValue.
The integer appearing in each index argument must be greater than or equal to zero. The integer appearing in each index argument must be
strictly less than the length of the corresponding list. In other words, the lset command cannot change the size of a list. If an index
is outside the permitted range, an error is reported.
EXAMPLES
In each of these examples, the initial value of x is:
set x [list [list a b c] [list d e f] [list g h i]]
=> {a b c} {d e f} {g h i}
The indicated return value also becomes the new value of x (except in the last case, which is an error which leaves the value of x
unchanged.)
lset x {j k l} => j k l
lset x {} {j k l} => j k l
lset x 0 j => j {d e f} {g h i}
lset x 2 j => {a b c} {d e f} j
lset x end j => {a b c} {d e f} j
lset x end-1 j => {a b c} j {g h i}
lset x 2 1 j => {a b c} {d e f} {g j i}
lset x {2 1} j => {a b c} {d e f} {g j i}
lset x {2 3} j => list index out of range
In the following examples, the initial value of x is:
set x [list [list [list a b] [list c d]]
[list [list e f] [list g h]]]
=> {{a b} {c d}} {{e f} {g h}}
The indicated return value also becomes the new value of x.
lset x 1 1 0 j => {{a b} {c d}} {{e f} {j h}}
lset x {1 1 0} j => {{a b} {c d}} {{e f} {j h}}
SEE ALSO
list(1T), lappend(1T), lindex(1T), linsert(1T), llength(1T), lsearch(1T), lsort(1T), lrange(1T), lreplace(1T)
KEYWORDS
element, index, list, replace, set
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Availability | SUNWTcl |
+--------------------+-----------------+
|Interface Stability | Uncommitted |
+--------------------+-----------------+
NOTES
Source for Tcl is available on http://opensolaris.org.
Tcl 8.4 lset(1T)