ICU-22907 MF2: Finish updating spec tests and implement required test functions #3216
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… functions Implement :test:format, :test:select, and :test:function, which are required by the new `pattern-selection.json` tests. Change the internal value representation in the formatter in order to support some of the test cases (binding the results of selectors to a variable).
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This PR does everything that's needed in order to make the pattern-selection spec tests work.
This includes implementing the test-only standard functions,
test:function,test:formatandtest:select, specified in the test README file in the spec.This was tricky because the select-only
test:selectfunction is used in a composable way in these tests, which isn't something that appeared in previous tests. Previously, the code assumed that a named result of a selector could be used in a.match, but not used as an operand to another function.So in this PR, I implement a limited form of what will eventually (see draft PR #3228, which is still in design review) be a more coherent mechanism for function composition. I implemented just enough of it to make these tests work.
I added an
InternalValuetype used in the formatter, which is distinct from theFormattedPlaceholdertype that function handlers return. This makes it easier to guarantee that fallback (error) values are not passed to functions. AnInternalValueincludes a function name, operand, and options. Since at the time when a resolved value is named, it's unknown whether it will be used for formatting or selection,InternalValuehas both a formatting and a selection method, which can be called when the resolved value is eventually consumed by either a.matchor a pattern.I had to modify the
depstest.pyscript for the same reasons as before; now, code that manipulates variants is also found inmessageformat2_evaluation.cpp, but as before, it's never used in a way that could throw an exception.I'll be happy to explain more and/or add comments to the code as needed.
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