Gojlox

Crafting Interpreters tree walking interpreter but in go, with a few add ons.

Additions

• +=, -=, etc.. operators.
• printf and other native functions.
• lambda's or annoymous functions. var a = fun(x) { print x; };
• repl can evaluate expressions, not only statements. (WIP)
  • 2 + 3 in the repl prints 5.
• static class functions using the static keyword before a class method.
• arrays and hashmaps

Running

git clone --depth=1 https://github.com/Subarctic2796/gojlox.git
cd gojlox
make build
./gojlox

Currently working on

• make instances hashable
  • maybe add id or uuid to instance that can then be used for the key
• add ability to define multiple variables on the same line var a, b, c = 1, "hi", true;

Current plans

• add support for expressions in the repl
• improve performance
  • move some of the resolver checks to the parser
    • ErrAlreadyInScope check
    • ErrLocalInitializesSelf check
    • ErrLocalNotRead check
  • use arrays instead of hashmaps for Env struct
  • move away from visitor pattern, and just use straight type checks
  • precompute some binary nodes
  • make real negative numbers
  • store scope info in ast nodes
• add arrays and hashmaps
  • add trailing comma support
  • add hashmaps
    • make instances hashable
  • add arrays
  • add fancy indexing
    • add slicing print arr[2:5];
    • add negative indexing print a[-2];
  • add in keyword for arrays and hashmaps
    • add for in loops.
    • add indexed looping for (var k, v in hashmap) printf(k, v);
• make ; optional
• add ability to import other files
• add type hints (want to make it statically typed if possible)
• add errors so that scripts can recover
• add proper variadics
• add ability to define multiple variables on the same line var a, b, c = 1, "hi", true;
• add test suite
• add --tokens and --ast flags to output the tokens and ast respectively to stdout (maybe compile flag also)
  • add pretty printer for ast
• consolidate Return, Break, Continue Statements into ControlStmt
  • add continue keyword
• remove genAst.go script
• add native classes (act as modules maybe?)
• back port clox variable handling ?
• add compile step (?)
• create Makefile
• add better error messages
• add else if branches and switch cases
• add debugging support, dumping env, etc
• add a native dummy function
• setup github releases
• add string interpolation