The interpreter is written in Python 3 and it currently can be used as an Interactive Prompt to evaluate expressions in real-time or to evaluate external files written in Chemit.

By executing the interpreter file (shell.py) you will be presented with this interface in the command line:

Chemit>

You can evaluate expressions by writing them after Chemit>:

Chemit> 1 + 2 + 3
6
Chemit> PRINT("hello world!")
hello world!
0

It's possible to load external files written in Chemit by calling the RUN function inside the interpreter interface.

chemit> RUN("test.myopl")
Hello
0

Chemit supports the order of operations in mathematics. The order of operations, which is used throughout mathematics, science, technology, and many computer programming languages, is expressed here:

1. exponentiation and root extraction
2. multiplication and division
3. addition and subtraction

chemit> 1 + 2 * 3
7
chemit> (1 + 2) * 3
9
chemit> 2^3 + 1
9

Note that the ^ operator is the power operator in chemit.

You can make variables and assign them any value using the VAR keyword.

chemit> VAR a = 1
1
chemit> VAR b = 2.2
2.2
chemit> VAR b = "string"
"string"

Chemit also supports different comparison operators: equals, not equals, less than, greater than, etc. Also, it supports the logical operators: AND, OR and NOT.

chemit> 1 > 0
1
chemit> 2 < -2
0
chemit> 2 != 2
0
chemit> 2 == 2
1
chemit> 1 OR 0
1
chemit> 1 AND 0
0
chemit> NOT 1
0
chemit> NOT 0
1

You can also use if statements in chemit using the following syntax:

chemit > IF(1 > 0) THEN PRINT("Hello")
Hello
0

Note that if the expression inside of the if statement evaluates to true then the expression after the THEN keyword will be executed, and you can also use the ELSE keyword to execute another expression if the expression inside the if statement is evaluated to false or 0.

chemit > IF(1 < 0) THEN PRINT("Hello") ELSE PRINT("Oops")
Oops
0

You can also use else-if statements.

chemit > IF(1 < 0) THEN PRINT("Hello") ELSE IF(1 > 0) THEN PRINT("Oops")
Oops
0

You can use the FOR and WHILE statements for looping in chemit:

chemit > FOR i = 5 TO 10 STEP 1 THEN PRINT("Hello")
Hello
Hello
Hello
Hello
Hello
[0, 0, 0, 0, 0]

chemit> WHILE TRUE THEN PRINT("Oops infinite loop")
infinite loop
....

In chemit you can define functions using the FUN keyword.

chemit > FUN test(a) -> a + 1
<function test>
chemit > test(1)
2