Hi,
There is no need to add "push" and "pop" macros. The set-widget and TWs
locale variable handling does exactly that.
Try the following code:
\define test() The tiddler knows this text
<$set name=test value="outer text">
1: <<test>><br/>
<$set name=test value="some inner text">
2: <<test>><br/>
</$set>
3: <<test>>
</$set>
4: <<test>>
The \define test() ... command internally creates a "tiddler wide" test
variable using the set-widget
The first set-widget defines a _new_ variable named test, that is only
visible between the first <$set> and the _last_ </$set>
So at 1: test will be "outer text"
The second set-widget does the same thing. It creates a new test-variable
At 2: test will be: "some inner text"
The first </$set> closing element will "forget" the inner test-variable and
activate the outer var again.
So at 3: test will be "outer text" again
The last macro call at 4: knows the "tiddler global" variable.
So the first <$set widget call is a "push" command and the first closing
</$set command is a "pop" command.
The same mechanism is true for recursive code, but it's a bit more complex.
... Example will follow.
-mario
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