plox

This is a python implemenation of the lox langauge as described in the book Crafting Interpreters by Robert Nystrom. In particular the first version from part 2.

Current state

• Line comments implemented (// comment)
• Expressions implemented
  • Assignment (IDENTIFIER = Expr)
  • Binary
    • Addition or Concatenation (Expr + Expr)
    • Subtraction (Expr - Expr)
    • Multiplication (Expr * Expr)
    • Division (Expr / Expr)
    • Comparisons
      • Equality (Expr == Expr)
      • Inequality (Expr != Expr)
      • Greater (Expr > Expr)
      • Greater or Equal (Expr >= Expr)
      • Less (Expr < Expr)
      • Less or Equal (Expr <= Expr)
  • Call (Expr())
  • Get (IDENTIFIER.IDENTIFIER)
  • Groupings ((Expr))
  • Literals (NUMBER, STRING, IDENTIFIER, true, false, "nil")
  • Logical
    • And (Expr and Expr)
    • Or (Expr or Expr)
  • Set (Expr = Expr)
  • Super (super.IDENTIFIER)
  • This (this.IDENTIFIER)
  • Unary
    • Negation (-Expr)
    • Logical Inverse (!Expr)
  • Variable (IDENTIFIER)
• Statements implemented
  • Block ({Stmt})
  • Class (class IDENTIFIER {Stmt})
  • Expression (Expr;)
  • Function (fun IDENTIFIER {Stmt})
  • If (if (Expr) {Stmt} else {Stmt})
  • Print (print Expr;)
  • Return (return Expr;)
  • Var (var IDENTIFIER;)
  • While (while (Expr) {Stmt})
    • For (for (INITIALIZER;CONDITION;INCREMENT) {Stmt}) (Syntactic sugar around a while loop)
• Scopes implemented
  • Global
  • Dynamic
  • Local
  • Closure

Usage

plox: a lox interpreter written in python

Usage:

$ plox [OPTIONS] COMMAND [ARGS]...

Options:

• --install-completion: Install completion for the current shell.
• --show-completion: Show completion for the current shell, to copy it or customize the installation.
• --help: Show this message and exit.

Commands:

• interpret: Execute a lox script.
• parse: Parse a lox script and display the...
• repl: Enter an interactive REPL for lox scripting.
• tokenize: Tokenize a lox script and display the...

plox interpret

Execute a lox script.

Usage:

$ plox interpret [OPTIONS] FILENAME

Arguments:

• FILENAME: File containing the lox script to be executed. [required]

Options:

• --help: Show this message and exit.

plox parse

Parse a lox script and display the abstract syntax tree produced from the parsing pass.

Usage:

$ plox parse [OPTIONS] FILENAME

Arguments:

• FILENAME: File containing the lox script to be parsed. [required]

Options:

• --help: Show this message and exit.

plox repl

Enter an interactive REPL for lox scripting.

Usage:

$ plox repl [OPTIONS]

Options:

• --help: Show this message and exit.

plox tokenize

Tokenize a lox script and display the results of the lexing pass.

Usage:

$ plox tokenize [OPTIONS] FILENAME

Arguments:

• FILENAME: File containing the lox script to be tokenized. [required]

Options:

• --help: Show this message and exit.