Crate ravenrs_sheet 

Headless spreadsheet engine for RavenRS.

The layers, from the bottom up:

• base: cell addresses, values, errors, date serials and input parsing.
• numfmt: number format codes, General display and TEXT().
• formula: the formula language: lexer, parser, printer and reference adjustment.
• functions: the worksheet function library.
• math: equations laid out from LaTeX, and their OMML form for XLSX.
• model: workbooks, sheets, copy-on-write cells, styles, tables and charts.
• calc: dependency graph, recalculation and dynamic arrays.
• xlsx: XLSX and CSV import and export.
• chart: chart data and layout into toolkit-free primitives, and sparklines.
• pdf: a small PDF writer for printing sheets.
• engine: sessions: every action is a command with an id and JSON parameters, with undo, clipboard, fill, sort and filter.

Nothing here draws or depends on a window, so it also runs on servers and in WebAssembly. The engine comes from GridCraft (MIT OR Apache-2.0); see NOTICE.

Modules

base

GridCraft core types: cell addresses, values and Excel’s coercion rules, error values, date serials and typed-input parsing. No dependencies on the rest of the workspace.

calc

GridCraft’s calculation engine: the evaluator (references, names, tables, LET/LAMBDA, dynamic arrays) and dependency-driven recalculation with spills and cycle detection.

chart

GridCraft charts (layer L3, toolkit-free).

engine

The GridCraft engine façade.

formula

The Excel formula language: tokenizer, parser, syntax tree, printer (A1 and R1C1) and reference adjustment for copy/fill and structural edits.

functions

GridCraft worksheet function library.

math

GridCraft equations. LaTeX source is laid out by RaTeX (ratex-parser, ratex-layout; MIT) into a MathList: plain glyph, rule and path data that the UI and the PDF writer paint without calling RaTeX again.

model

The GridCraft document model: workbooks, sheets, a copy-on-write cell store, interned styles, defined names, tables, conditional formats, validation, comments, charts and print settings. Pure data; calculation lives in gridcraft-calc.

numfmt

GridCraft number formats: Excel format codes (#,##0.00;[Red](#,##0.00), dates, fractions, scientific…), the General display format and the TEXT() worksheet function. en-US only.

pdf

A tiny, self-contained PDF 1.7 writer for GridCraft’s print and PDF export.

xlsx

GridCraft file formats: XLSX (transitional and strict) and CSV import/export, plus XLSB and ODS data import and legacy Excel 97-2003 .xls (BIFF8) import, and password-encrypted workbooks (Agile and Standard encryption).