pjfanning opened a new pull request, #1273:
URL: https://github.com/apache/poi/pull/1273
`WorkbookEvaluator.evaluateFormula(OperationEvaluationContext, Ptg[])` is
the low-level interpreter entry point: it evaluates parsed formula tokens
without a formula cell, result cache or dependency tracking. It was
package-private ("visibility raised for testing").
The rest of the evaluation SPI is already public — `EvaluationWorkbook`,
`EvaluationSheet`, `EvaluationCell`, `FormulaParsingWorkbook`,
`FormulaParser.parse(...)`, the `WorkbookEvaluator` and
`OperationEvaluationContext` constructors — so this was the one missing hook
for evaluating formulas against a custom in-memory `EvaluationWorkbook` without
building a `Workbook`. That lets a "standalone formula engine" such as the one
proposed in #1271 be built outside POI.
Kept `@Internal` to signal that it is a low-level hook, and added javadoc.
Extracted from #1271 (see discussion there).
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