Decaf

Important Notes

• Task 1 (Lexer) and Task 2 (Parser) are complete.

  • These tasks pass all the given tests as well as some additional tests.
  • Additionally, parser tree data pasting into HTML file is automated. Whenever script decaf-parser is executed for any testcase file, its tree is automatically constructed through HTML file.

• Task 3, 4 are incomplete.

Installation

• Install ANTLR python library: pip install antlr4-python3-runtime
• Install Pycharm or VSCode plugins for ANTLR 4.

Usage

• After updating Decaf.g4, compile the language: java -Xmx500M -cp antlr-4.7.2-complete.jar org.antlr.v4.Tool -Dlanguage=Python3 Decaf.g4 -visitor

If parser rules are updated, copy the methods from DecafVisitor.py to decaf-parser.py and replace visitChildren m method with printNode.

• Run lexer: python decaf-lexer.py
• Run Parser: python decaf-parser.py

ANTLR Guide

Checkout this tutorial for ANTLR: ANTLR Mega Tutorial