It is a standard OB filter subclassed from OBFilter. It is added to
OBCodeBrowser metagraph. There are source codes in attachment.
Have a look at OB-Refactory, it uses filters to show elements within
an environment in bold:
displayString: aString forParent: aParentNode child: aNode
"Display elements that are part of the environment in bold."
^ (mode = #highlight and: [ aNode withinBrowserEnvironment: environment
])
ifTrue: [ Text string: aString attribute: TextEmphasis bold ]
ifFalse: [ aString ]
Lukas
--
Lukas Renggli
http://www.lukas-renggli.ch
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