rr:RR-铁路图生成器

 # RR - Railroad Diagram Generator RR is a generator of syntax diagrams, also known as railroad diagrams. It is a self-contained tool with both a browser-based GUI and a batch mode. Besides generating diagrams from EBNF rules, RR also can perform some grammar transformation, e.g. factorization and elimination of direct recursion. To some extent this transforms BNF to EBNF, yielding more compact diagrams. # Examples Here are two examples of generated diagrams (taken from the [Python grammar][PYTHON]): **if_stmt:**  **try_stmt:**  # Grammar syntax RR accepts grammars in [W3C-style EBNF][W3C-EBNF]. Some other representations, including some parser generator input notations, can be converted to W3C-style using [Grammar Conversion][CONVERT]. # Distribution RR comes as a .zip, containing a .war file. The .war file can be deployed in servlet containers like Tomcat or Jetty for serving the GUI. This makes up the webapp that is running on the original website, <https://bottlecaps.de/rr/ui>. The .war file is a Java "executable war", i.e. it can also be started standalone from command line. Two different tasks can be performed in standalone mode: - serving the GUI, e.g. ```bash java -jar rr.war -gui ``` - batch diagram generation, e.g. ```bash java -jar rr.war grammar.ebnf ``` For listing the full set of available options, run ```bash java -jar rr.war ``` without further command line arguments. ## Building RR For building RR, JDK 8 (or higher) must be available. In the project folder, run this command to build the distribution .zip file: ```bash gradlew ``` ## Thanks This project makes use of * [Saxon-HE][SAXON], * [TagSoup][TAGSOUP], * [Apache Batik][BATIK], * [Gradle][GRADLE], and * [Gradle-License-Report][GRADLE-LICENSE-REPORT]. ## License RR is released under the [Apache 2 License][ASL]. ## Links The official website for RR is <https://bottlecaps.de/rr/ui>. [ASL]: http://www.apache.org/licenses/LICENSE-2.0 [PYTHON]: https://docs.python.org/3/reference/grammar.html [W3C-EBNF]: http://www.w3.org/TR/2010/REC-xquery-20101214/#EBNFNotation [CONVERT]: http://bottlecaps.de/convert/ [SAXON]: http://www.saxonica.com/products/products.xml [TAGSOUP]: http://vrici.lojban.org/~cowan/XML/tagsoup/ [BATIK]: https://xmlgraphics.apache.org/batik/ [GRADLE]: https://gradle.org/ [GRADLE-LICENSE-REPORT]: https://github.com/jk1/Gradle-License-Report