REPL of a simple, interpreted and statically-typed programming language.
Project description
Vadi is a simple, interpreted and dynamically-typed programming language. It comes with its own tool called a REPL, which lets you try out code quickly.
The interpreter which is the part of Vadi that runs your code, uses a technique named "Recursive Descent Parsing." This technique helps the interpreter understand your high-level code by creating a data-structure called a parse tree
. Then, the interpreter uses this parse tree to figure out what your code is asking it to do.You can check out the Vadi's Syntax Grammar in BNF for more information.
Installation
Use pip or pipx to install vadi's REPL.
[!TIP] The pipx package installer is strongly recommend for installing vadi on a global level to avoid conflicts.
pipx install vadi
OR
pip install vadi
Now, run the REPL.
vadi
Grammar
The grammar is written in BNF(Backus Naur Form) notation.
<Interpreter> ::= <binary_expression>
| <unary_expression>
| <statement>
| <expression>
| <VAR>
| <FLT>
| <INT>
<binary_expression> ::= <expression> "+" <expression>
| <expression> "-" <expression>
| <expression> "*" <expression>
| <expression> "/" <expression>
| <expression> "=" <expression>
<unary_expression> ::= "+" <expression>
| "-" <expression>
<statement> ::= "DECL" <variable> "=" <expression>
<expression> ::= <term> "+" <term>
| <term> "-" <term>
<term> ::= <factor> "*" <factor>
| <factor> "/" <factor>
<factor> ::= "INT"
| "FLT"
| "(" <expression> ")"
| <VAR>
Syntax
-
Unary operations
+1 -5
-
Binary operations
56+23
-
Complex arithmetic operations
1*2(4+5(5/6))
-
Variable declarations
var int = 89; var float = 3.1415; var difference = int - 20;
-
Conditionals: if-else
TODO: issue#2
-
Conditionals: loops
TODO: issue#2
Supported datatypes
- Integer
- Float
Contributing
Issues and Pull Requests are definitely welcome! Check out Contributing guidelines to get started. Everyone who interacts with the vadi project via codebase, issue tracker, chat rooms, or otherwise is expected to follow the Code of Conduct.
License
This project is licensed under the MIT License. See the LICENSE.
Project details
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