Makrell: A programming language family
Project description
Makrell
Makrell is family of programming language implemented in Python. It consists currently of these languages:
- MakrellPy, a general-purpose programming language with two-way Python compatibility. It features a simple syntax, functional programming constructs and meta programming.
- MRON (Makrell Object Notation), a lightweight alternative to JSON.
- MRML (Makrell Markup Language), a lightweight alternative to XML and HTML.
- Makrell Base Format, a simple data format that forms the basis for both MakrellPy, MRON and MRML.
Quick Start
Installation
pip install makrell
MakrellPy REPL usage
makrell
> 2 + 3
5
> [2 3 5] | sum
10
Run a MakrellPy script
makrell myscript.mr
IDE Support
MakrellPy is supported by the MakrellPy Language Server, included in the Makrell package. The language server is based on the LSP protocol and can be used with any LSP-compatible editor, such as Visual Studio Code, Sublime Text, Atom, Vim, Emacs etc. A VS Code extension is available here.
MakrellPy
The following is a quick introduction by example to the MakrellPy language. See examples and tests for more code examples.
Syntax
MakrellPy uses the Makrell Base Format as its base syntax (see below). MakrellPy-specific syntax is built on top of this. The following is a simple example of a MakrellPy program:
# This is a comment.
a = 2
b = a + 3
{sum [a b 5]} # function call
[a b 5] | sum # function call through pipe
# Conditional expression
{if a < b
"a is less than b"
"a is not less than b"}
# Function definition
{def add [x y]
x + y}
Note:
- The syntax is determined by lists and binary expressions.
- Return values are implicit, i.e. the last expression in a block is the return value.
Other Features
See the examples and tests directories for examples of the following features:
- Class definitions
- String interpolation
- Function composition
- Meta programming, including macros, custom operators and embedded mini-languages
- Python interoperability
TODOs and wishlist
- More built-in functions and operators
- Various missing Python features, such as decorators, yield and async/await
- Basic typing as in Python
- Pattern matching and destructuring
- More advanced typing, possibly unified with basic typing and grammar expressions
- Better error messages and better IDE support
- More documentation and examples
- Transpilers and code generators for other languages
- Mini-languages for e.g. database queries, regular expressions etc.
MRON
Example MRON document:
owner "Rena Holm"
last_update "2023-11-30"
books [
{
title "That Time of the Year Again"
year 1963
author "Norton Max"
}
{
title "One for the Team"
year 2024
author "Felicia X"
}
]
The above code corresponds to the following Python dictionary tree:
{
"owner": "Rena Holm",
"last_update": "2023-11-30",
"books": [
{
"title": "That Time of the Year Again",
"year": 1963,
"author": "Norton Max"
},
{
"title": "One for the Team",
"year": 2024,
"author": "Felicia X"
}
]
}
MRML
Example MRML document:
{html
{head
{title A Test}
}
{body
{h1 This is a Test}
{p [style="color: red"] Just some {b bold} text here.}
}
}
The above code corresponds to the following HTML:
<html>
<head>
<title>A Test</title>
</head>
<body>
<h1>This is a Test</h1>
<p style="color: red">Just some <b>bold</b> text here.</p>
</body>
</html>
Makrell Base Format
The Makrell Base Format is a simple data format that forms the basis for both MakrellPy, MRON and MRML. It is a simple text-based format that is easy to read and write. It is designed to be easy to parse and generate, and to be easy to work with in a text editor.
These element types are supported:
- Identifier: A simple name. Examples:
xY1$Example_Æ23.
- String: A sequence of characters surrounded by double quotes. The backslash character is used to escape double quotes and backslashes. A string may have a suffix that specifies an implementation-specific data type. Examples:
"Hi.""This is a string: \"Hi.\"""2024-02-02"date: a date"12AF"hex: a hexadecimal number
- Number: A numeric value. As with strings, a number may have a suffix that specifies an implementation-specific data type or value. Examples:
422.5e92.5G= 2,500,000,0002pi= 6.283185307179586
- List: A sequence of elements, surrounded by brackets and usually separated by spaces. Lists may be nested. There are three types of lists:
- "Round", e.g.
(2 3 5) - "Square", e.g.
["a" "b" "c"] - "Curly", e.g.
{asd qwe zxc}
- "Round", e.g.
- Operator: A symbol consisting of one or more non-alphanumeric characters. Examples:
+==|*<*>
For parsing purposes, the following element types are also defined:
- Whitespace: A sequence of space, tab and newline characters.
- Comment: A sequence of characters that is ignored by the parser. A line comment starts with a
#character and continues to the end of the line, while a block comment starts with/*and ends with*/. - Other Token: A sequence of characters that does not match any of the other element types.
In addition, the following element type is defined in the core library:
- Binary Expression: An operator with two operands.
License
Makrell is developed by Hans-Christian Holm and licensed under the MIT License. See LICENSE for details.
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