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> I suspect that formatting functions with named placeholders would be difficult to make acceptably ergonomic or performant in Java

yamlp performs string interpolation from YAML files:

https://bitbucket.org/djarvis/yamlp/

I reuse my library in my text editor:

https://github.com/DaveJarvis/scrivenvar/

The text editor can interpolate strings in a variety of contexts (such as Markdown, R Markdown, XML, and R XML documents):

https://www.youtube.com/watch?v=u_dFd6UhdV8

As far as I can tell, there is no performance degradation from the recursive interpolation; the editor reads, interpolates key/value pairs, and substitutes the resulting values into R Markdown documents riddled with up to a thousand simple formulas in about 600 milliseconds (on my desktop computer).

Also, the editor provides a way to maintain the interpolated variables in a tree-like view:

https://github.com/DaveJarvis/scrivenvar/blob/master/README....

The substituted values appear in the preview pane in their final form. This is all real-time and pure Java.






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