Interpreter-zig

Continuation from the interpreter-rust
The rust borrow checker made the way of making the interpreter feel like hell

I will still be following Crafting Interpreters hopeful on my own this time

Working model

Check out the working model at https://tushyagupta81.github.io/interpreter-zig
The backend might take 1-2 min to turn back on

Current progress

• How to read a file
• Using the gpa allocator
• REPL mode working
• Tokens
• Scanner
  • Challenge
    • Multiline comments
• Parser
  • Temp hack - Using arena allocator to help memory release
  • Challenge
    • Implement Comma operator from C and C++
    • Ternary operator
    • Detect a Binary operation with a missing left hand operator
• Interpreter
  • Challenge
    • compare numbers and string(Don't know what it should really do?)
    • and numbers to string
    • divide by 0 check
• Statements
  • Parts
    • Exprs
    • print
    • variables(without scope)
    • variables(with scope)
    • conditionals
    • and or operators
    • loops
  • Challenge
    • REPL to auto detect a expr vs a statement and execute them accordingly
    • Give runtime error for variable that are declared but not initialized
    • branching statements?
    • break statement
• Functions
  • Return
  • Local functions(can't really figure it out moved all environments to the heap)
  • Challenge
    • Checking number of args at runtime hits preformance
    • Anonymous functions
• Resolver
  • Coping the env at the time of creation of the function
  • For the one from the book to work need to make it so that I can HashMap Expr itself and not there pointers
    • Got the tedious HashMap defination from tusharhero
    • Also needed a globals list(pointed the init env 2 times)
  • Resolve time errors
  • Challenge
    • Extend resolver to detect unused local variables
    • Look up variable using a index array instead of a hashmap
      • By sending the index and distance from the resolver
• ...

Pitfalls to fix

1. interpreter.zig
   • evaluvate_binary -> string concat size limit of 4096
2. token.zig
   • LiteralValue
     • to_string methods size limit of 4096
3. enironment.zig
   • get -> string concat size limit of 4096