GitHub - KimEJ/OpenJTD: Open-source JTD rendering engine and editor project for Ichitaro documents · GitHub
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KimEJ
OpenJTD
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OpenJTD
Open-source JTD rendering engine and editor project for Ichitaro documents<br>(.jtd, .jtt, and .jttc).
OpenJTD aims to become an open-source JTD rendering engine and editor. The<br>current phase focuses on rjtd, a Rust toolset that builds the components<br>needed to get there: container inspection, text extraction, document modeling,<br>export, and viewer integration. The longer-term technical milestone is a<br>practical JTD engine that can support faithful layout rendering and editing.
Current rjtd Components
CFB/OLE container inventory for .jtd, .jtt, and .jttc files, including<br>lenient fallback handling for malformed files.
Text extraction from observed /DocumentText streams.
Observed .jttc JustCompressedDocument and -lh5- payload support.
Embedded SsmgV.01 / TextV.01 fragment recovery for files without a named<br>/DocumentText stream.
Minimal Document Model output as plain text, Markdown, JSON, and text-oriented<br>PDF.
Diagnostic parsers for /DocumentTextPositionTables, /LineMark,<br>/PageMark, /PaperMark, and object/control marker research.
WASM wrapper support used by early viewer integration experiments.
rjtd Quick Start
cd rjtd<br>cargo test --workspace
cargo run -p rjtd-cli -- info path/to/document.jtd<br>cargo run -p rjtd-cli -- cat path/to/document.jtd<br>cargo run -p rjtd-cli -- export path/to/document.jtd --format md<br>cargo run -p rjtd-cli -- export path/to/document.jtd --format json<br>cargo run -p rjtd-cli -- export path/to/document.jtd --format pdf -o output.pdf
Repository Layout
rjtd/ - Rust toolset and workspace for the current OpenJTD<br>components: core engine, CLI, exporters, WASM wrapper, and test helpers.
openjtd-spec/ - public specification notes and RFC records.
docs/ - charter, architecture, roadmap, and research policy.
openjtd-samples/ - redistributable sample/output artifacts.
rjtd-testdata/ - test fixtures.
openjtd.github.io/ - future project site.
Documentation
rjtd/README.md describes the rjtd Rust workspace, CLI,<br>exporter, and diagnostic command surface.
openjtd-spec/README.md indexes the specification work and<br>RFC process.
docs/CHARTER.md, docs/ARCHITECTURE.md,<br>and docs/ROADMAP.md explain the project direction.
Design Reference
OpenJTD's repository layout and engine boundaries take inspiration from the<br>rhwp project structure, adapted for JTD.
Project Status
OpenJTD is in the reverse-engineering and component-building stage. It is not<br>yet a complete JTD rendering engine or editor, and the rjtd APIs, data model,<br>and diagnostic commands may still change.
Text extraction works for observed files, but full paragraph semantics, layout<br>fidelity, styles, tables, ruby annotations, images, and native editing behavior<br>are incomplete. PDF and SVG output should be treated as text-oriented fallback<br>output, not native layout reproduction.
Translations
English is the default documentation language. Japanese translations use<br>*.ja.md.
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Open-source JTD rendering engine and editor project for Ichitaro documents
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