# varphi_parsing_tools
This repository contains the grammar for the Varphi Programming Language, as well as an ANTLR-generated lexer and parser, for use by `vpc` and by other potential compilers and interpreters.
Contributors editing the grammar for the language may make their changes to `varphi_parsing_tools/Varphi.g4`, and then follow the follow instructions
1. Install the ANTLR runtime for Python
```
pip install antlr4-python3-runtime
```
2. Download the ANTLR `.jar` from [here](https://www.antlr.org/download.html)
3. Open a new terminal, change into this repository directory, and run
```
java -jar <PATH TO ANTLR JAR> -Dlanguage=Python3 varphi_parsing_tools/Varphi.g4
```
This will generate the Python files required to support the new grammar. There are
* `varphi_parsing_tools/VarphiLexer.py`
* `varphi_parsing_tools/VarphiParser.py`
* `varphi_parsing_tools/VarphiListener.py`
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