streetartist / Deity

Simple language built in Python using SLY

Requirements

• Python 3.8+
• Installation of requirements.txt pip install -r requirements.txt

Usage

• Windows: python deity.py file_path <'debug'>
• Linux: ./deity.py file_path <'debug'> or python3 deity.py file_path <'debug'>
• Run all tests: Replace file_path with runall

Operators

• Less Than: a < b
• Greater Than: a > b
• Less than or equal to: a <= b
• Greater than or equal to: a >= b
• Equal: a == b or a === b
• Inequal: a != b or a !== b
• And: a && b
• Or: a || b
• Logical not: !a
• Addition: a + b
• Subtraction: a - b
• Multiplication: a * b
• Division: a / b
• Modulo: a % b
• Accessor: a.b
• Pipe: (a) | (b) where a is an expression(s), and b is a function

Types

• obj (for unknown or flexible types)
• string
• int
• float
• null
• boolean

Constants

• true
• false
• null

Standard Library

• put(args...) -> Standard print function
• memaddr(obj) -> Retrieves memory address for obj
• input(prompt[, callable]) -> Retrieves user input with an optional callable param to evaluate the validity of the result of user input, continues callable evaluates to true
• converter.to_integer(x) -> Attempts to convert x to an integer
• converter.to_float(x) -> Attempts to convert x to a float
• converter.to_string(x) -> Converts x to a string
• converter.to_boolean(x) -> Evaluates the truthiness of x and returns it
• str.lower(x) -> Converts x to a string and makes it lowercase
• str.upper(x) -> Converts x to a string and makes it uppercase
• str.capitalize(x) -> Converts x to a string and capitalizes it

Functions

Declaration

fn my_func(int param1, string param2) : return_type {
    // fn body
    return value;
}

Usage

my_func(123, "abc");

Variables

Declaration

string my_string = "abc";
int my_int = 123;
boolean x = true;
boolean y = false;

Reassignment

my_string = "def";
my_int = 456;

Control Flow

If statement

string a = "abc";

if (a == "abc") { // parentheses optional
    put("a is abc");
} else if (a == "def") {
    put("a is def");
}

For loop

for int i : (1, 10) { // (1, 10, 1) (start, stop[, step=1])
    put(i);
}

While loop

int i = 0;

while (i < 30) {
    put(i);
    i = i + 1;
}