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tables: expand multi-row cells in-place when fallback heuristic is empty (#71)

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* tables: expand multi-row TSR cells in place

Recover row-under-counted TSR tables by splitting overstuffed cells with native PDF text bands before falling back to heuristic extraction.

Made-with: Cursor

* docs: note multi-row expansion scope

Clarify that the row-band cap intentionally keeps v1 focused on common small row-loss cases while larger compressions continue to use heuristic fallback.

Made-with: Cursor
This commit is contained in:
Abimael Martell
2026-04-29 08:18:09 -07:00
committed by GitHub
parent 63b5573133
commit 5b1fe30c66
3 changed files with 603 additions and 87 deletions
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napi/src/lib.rs
+9 -7
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@@ -482,9 +482,10 @@ pub fn extract_tables_with_structure_cells(
/// `fallbackReason` is `null` when the TSR-hybrid path produced the
/// markdown directly. When stage 1's quality check fires (the cells
/// look like a SLANet detection pathology — phantom rows or multi-row
/// content in a single cell), the heuristic table extractor is run on
/// the same region instead, and `fallbackReason` carries the diagnostic
/// label (`"phantom_empty_row"`, `"multi_row_in_cell"`).
/// content in a single cell), the auto path may expand the TSR cells
/// in-place or run the heuristic table extractor on the same region.
/// `fallbackReason` carries the diagnostic label (for example
/// `"multi_row_in_cell_expanded"` or `"phantom_empty_row"`).
#[napi(object)]
pub struct TableExtractionResultJs {
pub markdown: String,
@@ -494,13 +495,14 @@ pub struct TableExtractionResultJs {
/// Auto-fallback variant of [`extractTablesWithStructure`].
///
/// Runs the TSR-hybrid path, checks the resulting cells for known
/// SLANet detection pathologies, and falls back to the heuristic
/// `extractTablesInRegions` for any input where the TSR path looks
/// SLANet detection pathologies, expands multi-row cells in-place when
/// possible, and otherwise falls back to the heuristic
/// `extractTablesInRegions` for inputs where the TSR path looks
/// compromised.
///
/// On clean inputs this returns identical markdown to
/// `extractTablesWithStructure`; on flagged inputs the heuristic
/// markdown replaces the TSR markdown and `fallbackReason` is set.
/// `extractTablesWithStructure`; on flagged inputs `fallbackReason` is
/// set to the recovery path that produced the result.
#[napi]
pub fn extract_tables_with_structure_auto(
buffer: Buffer,