A toy interpreter for a toy version of ABAP.

1. Clone the repo.
2. Run CLASSPATH=path/to/your/antlr-4.8-complete.jar make prepare (the Makefile has `/usr/share/java/antlr-4.8-comple.har as a default path).
3. Run the project as node index.js or event ./index.js!

node index.js --source <sourceFile> [--input <inputFile>]

Input defaults to stdin.

• task.md: The task in hand.
• ABAP.g4: ANTLR grammar for the project
• index.js: Entrypoint for the interpreter. Contains the setup of the parser and the handling of the arguments.
• ChecksVisitor.js: A ParseTreeVisitor that transforms a parse tree into a (maybe empty) list of errors.
• CompilerVisitor.js: A ParseTreeVisitor that transforms a parse tree into an anonymous function that interprets the program.
• test: Small "test-suite"
  • example*.abap: An example file
  • example*.input: The input to test that example file
  • example*.output: The expected output

Note: the Makefile uses GNU Make syntax. If you use Windows or BSD flavors of make it will not work.

• tree-% and gui-%: Run antlr's grun and see the parse tree of test/example%.abap
• test-%: Run the interpeter on test/example&.abap with test/example%.input as input and compare the results against test/example%.output.
• prepare: Generates the javascript parser files.
• clean: Remove all the files generated by antlr.