* feat(markdown): underline emission, Unicode scripts, style-preserving merges (ENG-5015 2b)
Three formatting losses in the direct-extraction markdown path:
1. text_with_formatting gains <u> run emission (detect_underline option,
default on) using the geometric is_underline flag from 1.9.9.
Underline runs stay free of nested bold/italic markers — consumers
match tag content literally. Heading lines keep plain text for
bold/italic but preserve <u>: the tag carries meaning `#` doesn't.
2. merge_subscript_items now maps absorbed digit scripts to Unicode
sub/superscript forms with direction from the baseline offset
("H"+"2" -> "H₂", "word"+raised "2" -> "word²", "m"+"3" -> "m³").
NFKC/NFKD folds these back to plain digits so text matching
downstream is unaffected; renderers keep the script semantics.
3. merge_text_items no longer merges across bold/italic boundaries —
absorbing a styled run into a plain neighbor erased the styling
before markdown emission ever saw it. On eval docs this recovers
20-82 italic runs per document that previously emitted as plain.
Snapshots regenerated (diffs are the features: CCl₂F₂, m³, underlined
legal section headings, finer bold runs). pdf-evals regression suite:
202/202 real PDFs pass. napi 1.9.9 -> 1.9.10.
Co-authored-by: Cursor <cursoragent@cursor.com>
* fix(extractor): break merges at underline boundaries too (review)
OR-merging underline stretched the eventual <u> span over neighboring
plain fragments. Merge runs now break on any style-flag change, the
redundant accumulator is gone, and format_list_item learned to move
bullet markers outside <u> wrappers so fully-underlined bullet lines
still render as markdown lists. td9264 snapshot regenerated — spans are
tighter (trailing periods correctly outside the tag).
Co-authored-by: Cursor <cursoragent@cursor.com>
* fix(markdown): strip stray spaces before sentence punctuation (review)
Style-boundary item splits can strand a trailing period in its own
fragment, and multiple assembly paths join fragments with spaces,
yielding "word ." artifacts. Rather than chasing every join site, a
postprocess pass removes a space before `.`/`,`/`;` when the mark ends
its token (whitespace, cell boundary `|`, or end of text follows).
Dot leaders/ellipses and mid-token periods are untouched.
Fixes the td9264 "companies ." artifacts and two pre-existing
"armoring ," artifacts in the 2013-app2 snapshot. pdf-evals: zero
markdown diffs across all 203 corpus PDFs vs committed baselines.
Co-authored-by: Cursor <cursoragent@cursor.com>
* fix(tables): trim spaces inside parenthetical cell fragments
* fix(tables): reject sparse prose row-stripe tables
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Co-authored-by: Cursor <cursoragent@cursor.com>
Replace ad-hoc bold/ratio heading checks with a unified scoring system
based on font size rarity. For each line, compute:
score = font_rarity * 0.5 + bold * 0.3 + standalone * 0.2
Font rarity measures how infrequently a font size appears across the
document — heading fonts are rare while body text is common. This
approach (from opendataloader's ModeWeightStatistics) naturally adapts
to each document's font distribution instead of relying on fixed
thresholds.
Guards: require font_size >= 0.95 * base_size (no small-font headings),
word_count >= 3, and standalone (paragraph break before).
Benchmark improvement: MHS 0.56→0.58, MHS-S 0.66→0.70, overall +0.003.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Caption detection was incorrectly classifying "Table of Contents" as a
caption because it starts with "Table ". Now "Table" and "Figure"
prefixes require a digit, parenthesis, or hash after them — matching
actual captions like "Table 1", "Figure 3.2" but not titles.
Also removes debug logging left from previous iteration.
Benchmark improvement: MHS 0.52→0.54, overall 0.757→0.761.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The colon exclusion was preventing legitimate headings like "Steps for
Using the Microscope:" and "Changing objectives:" from being detected.
The single edge case it was protecting (chart sub-headers) is less
impactful than the many headings it was blocking.
Benchmark improvement: MHS 0.51→0.52, MHS-S 0.61→0.62.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Bold lines at body font size that are standalone (preceded by a paragraph
break) and have ≥3 words are promoted to headings. This catches the
common pattern in academic/technical PDFs where section headings use
bold text at the same size as body text.
Guards against false positives: minimum word count, colon-ending
exclusion (labels like "Table I:").
Benchmark improvement: MHS 0.37→0.50, overall 0.71→0.75.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Drop column-width padding from table output. Saves ~37% bytes on
table-heavy PDFs. Markdown renders identically — padding was purely
cosmetic. Optimizes token efficiency for AI agent consumers.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
When a PDF page has a graph directly above a table (e.g. Figure 2 above
Table II in real-estate-pricing.pdf), the heuristic table detector would
merge graph axis labels and legend items into the table, producing a
corrupted result.
Add rect hint regions: when a small cluster of cell-border rects (4-6)
fails full grid validation (e.g. only row borders, no column dividers),
extract their Y bounding box as a "hint region". The heuristic detector
then runs separately on items inside vs outside hint regions, preventing
unrelated content from being merged into tables.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Rects spanning multiple grid rows (e.g. classification labels) now have
their text consolidated into the first sub-row via propagate_merged_cells().
Also prevent continuation-row merge from folding body data into the header.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add 5 stripped public-domain PDF fixtures and golden markdown snapshots
for CI regression testing. Fix non-deterministic output caused by
HashMap iteration order in font stats, table heuristics, and rect
clustering by adding deterministic tie-breaking.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
