master-of-hwp 0.2.1

Read Korean HWP/HWPX documents in Python; edit paragraphs and table cells in HWPX; natural-language edits via Claude or OpenAI. AI-friendly API.

master-of-hwp

Read Korean HWP/HWPX documents in Python, edit paragraphs in HWPX, and expose structure to AI workflows.

master-of-hwp is a Python-first library for opening real .hwp and .hwpx files, inspecting sections / paragraphs / tables, querying content, and performing immutable paragraph edits. The API is designed to be LLM-friendly: results are plain Python data structures, every mutation returns a new document, and a round-trip fidelity harness validates that edits preserve document structure.

Why this exists

Korean government, education, and enterprise workflows rely on HWP documents. Most AI tooling can't touch them directly — they get round-tripped through DOCX, shredding tables and formatting. master-of-hwp reads the real format, exposes the structure AI needs, and keeps edits byte-level honest.

30-Second Quickstart

pip install master-of-hwp

from master_of_hwp import HwpDocument

doc = HwpDocument.open("report.hwpx")

# Inspect
print(f"{doc.sections_count} sections, {len(list(doc.iter_paragraphs()))} paragraphs")
print(doc.summary())

# Query
for section, paragraph, text in doc.find_paragraphs("보도자료"):
    print(f"§{section}.{paragraph}: {text}")

# Edit (HWPX) — immutable: returns a new document
edited = doc.replace_paragraph(0, 0, "New intro text")
edited.path.with_suffix(".edited.hwpx").write_bytes(edited.raw_bytes)

API at a Glance

API	Purpose
HwpDocument.open(path)	Open .hwp / .hwpx as an immutable document
.sections_count	Number of sections
.byte_size	Size of raw bytes
.section_texts	Plain text per section
.section_paragraphs	Paragraphs per section (nested list)
.section_tables	Tables: [section][table][row][cell][paragraph]
.plain_text	All sections concatenated, format-agnostic normalization
.iter_paragraphs()	Yield (section, paragraph, text) tuples
.find_paragraphs(query, regex=, case_sensitive=)	Substring or regex search
.summary()	Compact JSON-serializable overview for LLM context
.replace_paragraph(s, p, text)	Return a new document with one paragraph replaced
.replace_table_cell_paragraph(s, t, r, c, p, text)	Edit a paragraph inside a table cell (HWPX)
.ai_edit(request, provider=, dry_run=)	Natural-language edit pipeline (intent → locate → apply → verify)

Supported Formats

Capability	HWP 5.0 (.hwp)	HWPX (.hwpx)
Open document	✅	✅
Count sections	✅	✅
Extract section text	✅	✅
Enumerate paragraphs	✅	✅
Enumerate tables	Best effort*	✅
Replace paragraph	Same-length only**	✅
Replace table cell paragraph	❌ (v0.3)	✅
Insert / delete	❌ (v0.3)	❌ (v0.3)

^{* Minimal heuristic anchored on the TABLE(0x5B) record; exact row/cell recovery is pending a richer record-level parser. ** Different-length HWP 5.0 edits require a CFBF stream resize writer, scheduled for v0.3.}

Natural-Language Editing

pip install master-of-hwp[ai]  # adds anthropic SDK
export ANTHROPIC_API_KEY=sk-ant-...

from master_of_hwp import HwpDocument
from master_of_hwp.ai.providers import AnthropicProvider

doc = HwpDocument.open("가정통신문.hwpx")
result = doc.ai_edit(
    "첫 번째 문단의 '급식비'를 '수업료'로 바꿔줘",
    provider=AnthropicProvider(),
)
if result.status == "applied":
    result.new_doc.path.with_suffix(".edited.hwpx").write_bytes(result.new_doc.raw_bytes)
else:
    print(result.message)  # refused / failed explanation

Without an API key, a rule-based fallback parser handles simple patterns (바꿔, 변경, keyword matches). See master_of_hwp.ai.providers for the LLMProvider Protocol — plug in OpenAI, local Ollama, etc.

Studio (Non-developer GUI)

For teachers / office workers who want a one-click experience — rhwp WYSIWYG editor is now bundled (v0.2+):

pip install master-of-hwp-studio
mohwp studio                    # launches web GUI + MCP server + bundled rhwp editor
mohwp mcp-config                # prints Claude Desktop config snippet

No Node.js setup required. The rhwp editor runs automatically on localhost:7700.

See studio/README.md.

Fidelity Harness

from master_of_hwp.fidelity.harness import verify_replace_roundtrip
from master_of_hwp.core.document import SourceFormat

report = verify_replace_roundtrip(
    raw_bytes, SourceFormat.HWPX, section_index=0, paragraph_index=5, new_text="New content"
)
assert report.structural_equal
assert report.edited_paragraph_applied

Examples

python examples/01_read_sections.py  samples/public-official/table-vpos-01.hwpx
python examples/02_extract_tables.py samples/public-official/table-vpos-01.hwpx
python examples/03_edit_paragraph.py samples/public-official/table-vpos-01.hwpx outputs/edited.hwpx

Roadmap

• v0.1 ✅ — Read path, HWPX paragraph replacement, fidelity harness, AI scaffold
• v0.2 — HWP 5.0 resize writer, paragraph insert/delete, table cell edit
• v0.3 — Full agentic edit loop (intent → locate → operate → verify → rollback)
• v1.0 — API compatibility contract starts

Details: docs/ROADMAP.md, docs/ARCHITECTURE.md.

Philosophy

• Platform-first — infrastructure, not a template app.
• Round-trip fidelity is the contract — opening and saving must not corrupt structure; proved by a benchmark, not a hope.
• Agentic document intelligence — documents should understand themselves.
• Solo OSS · no commercial pressure · quality first — take the time it needs.

Contributing

Contributions are very welcome — this is an open, community-driven project.

• 🐛 Bug reports / feature requests: open an issue
• 💻 Code contributions: fork → branch → PR. See CONTRIBUTING.md for dev setup, test expectations, and scope.
• 💬 Questions / discussion: GitHub Discussions

Areas we'd love help on:

• HWP 5.0 CFBF resize writer (v0.3)
• Paragraph insert / delete operations for both formats
• Additional LLM providers (OpenAI, Gemini, local Ollama) on top of the LLMProvider Protocol
• Windows / Linux installer for master-of-hwp-studio
• Accessibility improvements to the web GUI

No contribution is too small. Documentation fixes, typo corrections, and sample HWP files are equally valuable.

Acknowledgments

The WYSIWYG editor bundled in master-of-hwp-studio is built on rhwp by @edwardkim — a Rust + WebAssembly HWP parsing / rendering engine. This project would not be possible without their work. If you find master-of-hwp-studio useful, please star rhwp too.

License

MIT — see LICENSE.

한국어 개요

프로젝트의 한국어 소개는 README.ko.md 를 참고하세요.