a1

Parse and round-trip $A$1, $A1, A$1 absolute reference markers.
Equality and hashCode remain position-based only.

Co-Authored-By: Claude Opus 4.5 [email protected]

• Added $ absolute reference notation support ($A$1, $A1, A$1, A1)
• Added columnAbsolute and rowAbsolute fields to A1, A1Partial, and A1Reference
• toString() round-trips absolute markers: $A$1 parses and serializes correctly
• Equality and hashCode remain position-based (absolute state does not affect equality)
• Added A1.copyWith() for changing absolute flags on existing references

• Added A1.maxRows and A1.maxColumns constants with bounds validation on construction
• Added A1Range.collapsed() factory, isCollapsed getter, rowIterable() and columnIterable() methods
• Refactored [Quadtree] internals from array-based to map-based with Quadrant enum for correctness
• Improved internal naming for row/column partial helpers
• Fixed A1Reference.parse to treat bare cell/range strings (e.g. A1, A1:B2) as cell references instead of worksheet names
• Upgraded to petitparser ^7.0.1 and lints ^6.1.0

• Breaking changes on comparison of [A1], to provide deterministic binary searches
• Addition of [A1RangeSearch] that features a binary, quadtree searches and merge movements across mutliple [A1Range]s for a match
• Simplified [A1Range], [A1] and [A1Partial] to use rectangle-like logic, even for unbounded ranges
• Adding left,top,right,bottom as well as columnSpan and rowSpan to [A1Range]
• Refactored numerous tests to match the new more deterministic logic for comparisons, column/row matches

• Add features for A1Range to selection single border for left,top,right,bottom of range
• Fix range [A1Range] comparison to compare whole single/multi-column, single/multi-whole row, whole sheet
• Bug fix [A1Range] hashCode for range A1:A1, as this would return zero (0) for single value ranges like A1:A1, B2:B2
• Add intersect, subtract and overlayRanges to assist with formatting ranges in a worksheet
• Worthy of a minor version bump to 1.1.0

• Bug fix for hasRow, hasColumn for whole columns/rows ie. A:A, 1:1 cases
• Add features to check if a partial represents a whole row or column or either
• Add A1Range.all and A1Partial.all to support these single use-cases

• Fixeg bug in hasCorner or the A:A, 2:2 cases ie. whole row or column selection

• Add hasRow/Column method for A1Range to help with showing selection in a spreadsheet UI
• Fixed bug that didn't allow parsing A1Range A:C (cols)

• Add method for A1Range to check if an A1 is in one of its corners, typically a suitable place for an anchor cell

• Fix edge case in a A1Range where the FROM has a greater column than the TO

• Enhanced A1Range with an optional anchor cell

• Enhanced A1Range with fromA1s method.
• Enhanced A1Partial with fromA1 method.

• Enhanced A1Partial to accept a vector
• Moved the int to A1 Letters into an extension on int

• Added testing is an A1 is in an A1Range with contains method
• Slight tweak on comparing a A1Partial eg. A with 1, it will now use the larger index rather than have A always be larger
• Adjusted tests for above tweak

• Added support for A1 mapping as an extension on Map<String,String> to Map<A1,A1> to assist with A1 moves

• Added support for A1 as an extension on Set to simplify creating an a1 set from String

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• Added A1Range and A1Reference examples to readme and example
• Adjusted area to be a double for A1 and build this into a range
• Fixed minor bug with parsing a partial range in a reference
• Added github action build pipeline with coverage
• Move test coverage to 100%

• Minor fixes in docs and imports
• Added icon

• Initial version that implements