pptspine 0.1.0

Pure-Rust PowerPoint (.pptx / OOXML) structural parser with local image OCR, via PyO3.

pptspine

A pure-Rust PowerPoint (.pptx) parser with Python bindings (PyO3 / maturin, abi3-py311). A .pptx file is OOXML — a zip archive of XML parts — and pptspine walks that XML directly to produce a structured, information-preserving model: slides, text frames (paragraphs + styled runs), tables (cells, merges, fills), pictures, and autoshapes. Embedded images can additionally be OCR'd locally, offline, and deterministically via the sibling ocrspine crate (PP-OCRv5 through tract-onnx — no cloud, no network).

Capabilities

Area	Status
Slides + slide size	parsed
Text frames: paragraphs, runs, text	parsed
Run styling: font, size, bold, italic, solid-fill color	parsed
Paragraph level + alignment	parsed
Tables: rows, cells, cell text	parsed
Table merges: gridSpan / rowSpan / hMerge / vMerge	parsed
Cell solid-fill color	parsed
Pictures: r:embed rel → media name + raw bytes	parsed
Autoshapes: geometry name, fill, stroke, optional text	parsed (best-effort)
Groups (p:grpSp): recursive	parsed
Image OCR (embedded pictures → words + boxes)	working (ocr_image)
Image-table geometry reconstruction from OCR boxes	deferred (stub)

Parsing is tolerant: unknown elements are skipped, missing attributes become None, and malformed input yields a typed PptError rather than a panic.

Build (from the package root)

uv venv .venv
VIRTUAL_ENV="$(pwd)/.venv" uv pip install maturin pytest
# Structural parsing needs no models. The OCR path resolves models from
# ../ocrspine/models by default (or set OCRSPINE_MODELS).
OCRSPINE_MODELS="$(cd ../ocrspine && pwd)/models" \
  VIRTUAL_ENV="$(pwd)/.venv" .venv/bin/maturin develop --release

Use from Python

import pptspine

pres = pptspine.open("deck.pptx")
print(pres.slide_count, pres.slide_size)   # e.g. 2 (9144000, 6858000)  # EMU

for slide in pres.slides():
    for shape in slide.shapes():           # list[dict], introspectable
        if shape["kind"] == "text":
            for para in shape["paragraphs"]:
                for run in para["runs"]:
                    print(run["text"], run["bold"], run["color"])
        elif shape["kind"] == "table":
            for row in shape["rows"]:
                print([cell["text"] for cell in row])
        elif shape["kind"] == "picture":
            print("image:", shape["media"])

# Run OCR on raw image bytes (PNG/JPEG), offline:
items = pptspine.ocr_image(open("scan.png", "rb").read())
print(" ".join(i["text"] for i in items))

Rust workspace

crates/
  ppt-core    domain model + geometry (EMU) + typed PptError. No IO/zip/XML.
  ppt-parse   OOXML reader: zip extract + quick-xml walk -> Presentation.
  ppt-ocr     image-OCR bridge over ocrspine (PaddleOcr).
  py-bindings PyO3 _core extension (the FFI chokepoint).

Deferred / follow-up

• Image-table geometry reconstruction from OCR boxes (ppt_ocr::reconstruct_table_from_image, currently a typed Unsupported stub).
• Bundling the PP-OCRv5 ONNX weights into the published wheel (a CI task).
• Richer color models (theme/scheme colors, gradients), hyperlinks, charts, SmartArt, notes/comments.