Positron Programming Language - Practical
To run, download all of the files into one directory and then run python lang.py file.txt <arg1> <arg2> ... to run a program.
sympy needs to be installed to run Positron.
A tutorial will be coming sometime, so for now, hopefully these examples offer some guidelines of how to use this programming language.
There are a few datatypes:
- numbers: these are represented by the
sympyPython package to prevent floating point errors. - strings: these are just Python strings
- lists: these are just Python lists
- tuples: these are just Python tuples, except when you pass them to a function, it will splat them automatically. To prevent this, use
((1, 2, 3),)(i.e. wrapping it in an outer tuple)
To assign a value to a symbol, use the = operator. For example, x = 2 assigns 2 to the symbol x. x = y = 2 will assign 2 to y and y to x, which will make both x and y equal 2.
A function object looks like this:
function {
// Do something; arguments are $1, $2, ... with $0 being the whole list of arguments
}
This can be treated like any other object, including being passed into other functions like in Python.
A conditional looks like this:
if <condition> then {
// Do something
} elif <condition> then {
// Do something
} else {
// Do something
}
If <condition> is a simple statement, it doesn't need brackets around it, but sometimes it does. Unless you're using this language for code golf, use brackets anyway :P
A while loop looks like this:
while <condition> do {
// Do something
}
A foreach loop looks like this:
foreach <list> do {
// Do something; $1 is the current element
}
Function calls are done like so: function@argument, or with multiple arguments, function@(argument, argument, ...). To pass an actual tuple as one of the arguments, use function@((content, content),). Note that function@x will splat the argument if x is a tuple, so only use tuples when that is the desired behavior; otherwise, use lists.