pox

lox programming language ast-walking interpreter

Note: some differences compared to the original implementation of lox

• strings can be denoted with single quotes
• /* multi-line comments (nesting them is not supported) */
• escape sequences supported by python are supported on pox as well
• truthiness is implemented with python's bool function (truth testing procedure)
• fn instead of fun
• let instead of var
• pox has support for else-if (see the examples folder)
• the print statement doesn't exist

built-in classes:

• list this is a really thin wrapper around python's list type, see the source code for methods it has

built-in functions:

• print(value) prints the given value to stdout without a trailing new line
• println(value) prints the given value to stdout with a trailing new line
• input(prompt) python's input function, returns nil on EOFError
• chr(int), ord(char) python's chr and ord functions, they both return nil on TypeError
• str(object), int(string), float(string) python's str, int and float functions. int and float returns nil on ValueError
• strlen(string) returns the length of a given string, nil if the passed argument is not a string
• strn(string, n) returns the nth char of a given string, nil if n > len(string) or if string is not a string
• exit(value) calls sys.exit with the given value
• time() returns the time in seconds since the epoch as a floating point number
• sleep(secs) suspend execution of the program for the given number of seconds
• pow(a, b) returns a**b