jlox

An implementation of jlox, the first variant of the Lox language described in the book Crafting Interpreters by Robert Nystrom.

status

done

• codecrafters interpreter challenge (ch. 1-10 of the book)
• full jlox compliance (ch. 11-13 of the book) with overrides applied (see below)

overview

This implementation diverges from the one in the book in the following ways:

• extensive use of records, sealed interfaces, and pattern matching instead of the visitor pattern
• on-demand scanning
• synchronization is not implemented, so only the first syntax error is reported. (this requires some overrides to the test suite, which are applied by the makefile)
• uses a different driver and CLI so that it also satisfies the interface expected by the CodeCrafters Interpreter challenge

usage

just once, to fetch dependencies and so on:

make all

to run the jlox test suite:

make suite

there is a wrapper for the cli:

./lox           # run the repl
./lox FILE      # run a lox program stored in FILENAME

during development:

make test       # build the project and run integration tests
make suite      # run the test suite from the book repository
make package    # build an executable jar at target/lox.jar