A toy interpreted programming language written in Python.
Make sure you have Python installed on your computer.
Running lang.py will open up an interactive repl.
python lang.py
To run a file:
python lang.py <filename>
Press Ctrl+C to exit a program or the interactive repl.
Expressions follow normal BEDMAS rules.
1 + 1
3 - 2 * -6 / 3
(1 + 1) * 3
Logical and comparison operators follow the C-style syntax.
1 == 2
1 == 1 && 3 >= 0
Variables can be used once they have been assigned a value. Variable assignments are treated as expressions and can be used in arithmetic expressions.
a = 1
a = a + 3
1 + b = 1
If statements and while loops follow C-style syntax.
if (a == 1) {
b = 1
}
while (a < 10) {
a = a + 1
}
Adding the print keyword before an expression will print the interpreted result to the terminal.
print "Hello World!"
lang.py - The file that imports the modules for reading in the program source and printing out the results of the program.
The module responsible for lexing, parsing, and interpreting the program.
lexer.py - Scans the program for tokens.
parser.py - Parses through the tokens and returns a list of statements.
interpreter.py - Executes each of the statements.
The files that contain the classes which are used in the module lang for executing the program.
The files that contain information related to the language's grammar.
token_types.py - Stores the information of all the token types in language.