RSyntaxTree Version: 1.9.0
Thank you for using RSyntaxTree. If you like it, please give a star on
GitHub. It will be a great encouragement for me 😃
About
RSyntaxTree is a graphical syntax tree generator written in the Ruby programming language.
Documentation of the input text syntax and markups of RSyntaxTree is available in English and Japanese. See also Example Gallery for different types of sample input and result syntree images.
A command-line version of RSyntaxTree is available on GitHub. A web user interface for RSyntaxTree is also available; you can run RSyntaxTree with a web UI locally on your computer using Docker.
The original version of RSyntaxTree was inspired by phpSyntaxTree by André Esenbach.
What's new
- Attribute-value matrices:
\t aligns columns down a label and #( … #) nests one matrix inside another, for the feature structures of HPSG, SBCG and LFG [August 2026]
Hyphen option: read a hyphen as a hyphen rather than as underline markup, for feature names such as HEAD-DTR [August 2026]Gray lines colour scheme: labels stay black, connectors and movement paths go grey, for diagrams whose links outnumber their labels [August 2026]- Tidy layout: one scale from symmetric to high that packs the tree, with connector heights adjusted automatically [August 2026]
- Mirror option: right-to-left trees for Arabic and Hebrew syntax [August 2026]
- Horizontal spacing option, the counterpart of connector height [August 2026]
- Hangul and simplified/traditional Han now render in every font style [August 2026]
- Multilingual rendering improved: any script is measured by the engine that draws it [August 2026]
- Display settings are remembered across visits (input text is never saved) [August 2026]
- Region shade with
% syntax: shade the whole subtree a node governs [June 2026]
- A straight apostrophe in a label is now rendered as a typographic (curly) apostrophe [June 2026]
- Left-to-right tree layout (
Direction option: Top to Bottom / Left to Right) [April 2026]
- Per-node coloring with
@color: syntax (named colors and hex colors) [January 2026]
IPA (International Phonetic Alphabet) virtual keyboard added [June 2025]- Improved usability of the Web UI; Japanese UI added [February 2025]
Past updates
- Escape square brackets with
\[ and \] [October 2024]
- Cross-hatch rendering issue fixed [September 2023]
- PDF download feature added [February 2023]
- Line edge rendering improved [February 2023]
Line width option added [February 2023]Traditional color option added [February 2023]Hide default connectors option added [February 2023]- Extra connector drawing feature added [February 2023]
Noto Sans Mono font option added [January 2023]- The
¥ symbol can be used in place of the backslash \ to escape certain characters [November 2022]
- Documentation in 日本語 (Japanese) has been added [November 2022]
- RSyntaxTree on the Web (UI sourcecode package you can run locally using docker) [June 2022]
Polyline connector option [February 2022]- Improved user interface (error message display; image zoom, etc.) [January 2022]
- Comprehensive code rewrite [January 2022]
- Path drawing functionality (non-directional, directional, bidirectional) [January 2022]
- Text markup is more flexibly applicable than before [January 2022]
- New text markup patterns (newlines, brackets, horizontal lines, boxed texts) [January 2022]
- Triangle can be specified in all connector modes (
auto, bar, none) [January 2022]
- Subscript (
_text_) and superscript (__text__) specification is possible (e.g. DP_i_ → DPi, T__0__ → T0) [December 2021]
- Newline characters
\n can be used inside terminal nodes [December 2021]
- Label-less terminal nodes are now allowed (e.g.
[A [B] [C]]) [November 2021]
- Auto bracket close option [November 2021]
- Math symbol rendering [November 2021]
- Better image quality [November 2021]
- Some decoration symbols have been altered [November 2021]
- System fix (SVG download error) [November 2019]
- Bug fix (SVG color on/off) [April 2019]
- White spaces can be included in node labels with the
<> notation (e.g. Modal<>AUX) [June 2018]
- Various sizes of
margin to the image [February 2018]
- Better text editor using Ace [February 2018]
Connector height option [March 2018]- Syntax highlighting of input text [March 2018]
- Refined site design and documentation [March 2018]
- Text styles (italic and bold) and decoration (underline, overline, line-through) [March 2018]
How to cite
If you use RSyntaxTree in your research or teaching materials, please cite it. You can use the following BibTeX entry (adjust version to the one shown at the top of this page):
@software{hasebe_rsyntaxtree,
author = {Hasebe, Yoichiro},
title = {RSyntaxTree: A graphical syntax tree image generator},
url = {https://yohasebe.com/rsyntaxtree},
doi = {10.5281/zenodo.21916150},
version = {1.9.0},
year = {2026}
}
Related blog posts
RSyntaxTree tag on yohasebe.com
Author
Yoichiro HASEBE
License
The MIT License
RSyntaxTree