The left end of a flat operator chain is not nesting, so (((...1)))+1 is
accepted whenever (((...1))) is, in Spanish entry and display.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
along: =1+1+... with 4,096 operands (8,192 characters, exactly Excel's
limit, which Excel accepts and calculates) overflowed the stack when
entered, because the derived Clone of Expr recursed once per operand
down the chain's left spine. Saving hit the same in the XLSX writer.
- Expr: Clone, PartialEq, walk and map follow the left spine in a loop
and recurse only into right operands and real nesting.
- XLSX: _xlpm. prefixing and the implicit-intersection scan follow the
spine too. The scan's depth limit of 64 wrote any chain of more than
about 64 operands as a dynamic-array formula; such sums are plain
formulas again (ranges in the chain still get array evaluation).
- Evaluate Formula borrows sub-expressions instead of cloning each
operator's subtree (quadratic memory on a long chain).
- Spanish formula entry and display no longer refuse chains of more
than 256 operands; the left spine does not count as nesting.
Tests run on a 1 MiB stack (the Windows main thread) with Excel's
observed results: formula (clone/eq/walk/map/adjust at 4,096), calc
(401 and 4,096 operands, -, *, /, ^, &, %, comparisons, 1,500 refs),
xlsx (long chains written as scalar formulas), engine (cell.set, fill,
copy/paste, insert rows/columns, undo/redo, Evaluate Formula, XLSX save
and reopen), Spanish entry. Each fails without the fix.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- gridcraft_formula::same_name lower-cases then upper-cases each
character, so ß matches ẞ (to_uppercase alone maps ß to SS).
- Formula-bar input uses it too, so a binding such as ſi is not
translated to IF while the evaluator binds it.
- Tests: ISOMITTED with a case variant, ß/ẞ, and the Spanish input case.
aiongg