Lua interpreter in Python

This is my second take on writing a Lua-To-Python compiler, it includes:

• Lexer
• Parser
• A internal AST representation
• Repl
• Interpeter

Running repl

• python repl.py

TODO

• Introduce ; as a separator
• Named functions
• Not defined variables should return nil
• Modulo operator
• and operator
• or operator
• elseif statement
• Variables with numbers in name
• Iterator for Table using pairs/ipairs
• _G for globals access
• for loop
• while loop
• repeat loop
• Short circuit / tenary operator
• Dot property syntax in Table for string keys
• Numbers beginning with . (Ex .5)
• Handle global vs local variables in lua style
• Function calls with single params should not require parens
• Metatable support for tables

Supports

• Single and multiline comments
• Variable assignments
• Numbers
• Strings
• Tables
• Addition, multiplication and division
• If statements
• Comparison operators (==, >=, >, <, <≠, ~=)
• String concat ..
• return
• function declarations (both named and anymous with closures)
• not logical operator
• Negative values
• Table indexing
• Table count with #
• Non existing identifiers return nil
• Modulo operator

References

• A lot of the work here is based on the book Writing A Compiler In Go
• My first take
• A Python Interpreter Written in Python
• Let’s Build A Simple Interpreter. Part 7: Abstract Syntax Trees