Python implementation of Lox language interpreter.
This is tree walk interpreter is developed by following the Crafting Interpreter book.
$ git clone https://github.com/sh15h4nk/pyl0x.git
$ pip install pyl0x/Now you can use the interpreter with pylox command.
For the repl, you can use the pylox command.
$ pylox
> var a = 2;
> print a;
2
> print 5*2;
10
> print 1 == 1;
True
> Bye :)For running a script, (the script must have .lox extension) and needs to be non empty
Empty source file
$ pylox empty_file.lox
Your source file is empty :/Sample source:
// * has higher precedence than +.
print 2 + 3 * 4; // expect: 14
// * has higher precedence than -.
print 20 - 3 * 4; // expect: 8
// / has higher precedence than +.
print 2 + 6 / 3; // expect: 4
// / has higher precedence than -.
print 2 - 6 / 3; // expect: 0
// < has higher precedence than ==.
print false == 2 < 1; // expect: true
// > has higher precedence than ==.
print false == 1 > 2; // expect: true
// <= has higher precedence than ==.
print false == 2 <= 1; // expect: true
// >= has higher precedence than ==.
print false == 1 >= 2; // expect: true
// 1 - 1 is not space-sensitive.
print 1 - 1; // expect: 0
print 1 -1; // expect: 0
print 1- 1; // expect: 0
print 1-1; // expect: 0
// Using () for grouping.
print (2 * (6 - (2 + 2))); // expect: 4
$ pylox precedence.lox
14
8
4
0
True
True
True
True
0
0
0
0
4This source code is licensed under MIT License.