Sheet and repeating-field mappings
Expand grids, paired columns, header streams and small delimiter formats.
Turn an item-column order grid into line records
Retain row provenance and zero quantities when expanding a grid.
Group detail rows under their preceding document header
Convert a mixed header/detail stream into nested documents.
Zip metric, value and unit columns into observations
Keep positional measurements aligned without guessing missing cells.
Rebuild repeating lines from sparse numbered slots
Sort supplied positions while preserving gaps and zero lines.
Decode escaped separators in a label list
Distinguish literal pipes from list boundaries in a small custom grammar.