An odd dynamic programming language, interpreted by Python
Switch branches/tags
Nothing to show
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Permalink
Type Name Latest commit message Commit time
Failed to load latest commit information.
.gitignore
README.md
core.py
lark.py
larklex.py
larkparse.py
test.lk

README.md

lark

Language running on python -- everything is a value, whatever that means.

Features

  • python interoperability
  • reference counting (not complete yet, but close)
  • namespaces
  • closures
  • dynamic variables
  • flexible tuple data type (named members and positional slots)
  • explicit and unambiguous "references"

Getting Started

pip install ply
./lark.py

Examples

# comments
x = 3
y = { x } # boxed val
z = [a]{ a * x } # parametrized value
z[2] # 6

str = 'hello wendl' #string

make_counter = [n]{
    a = n
    { ^a = a + 1 } # last expression is returned
}
if true
    print['sane universe']
elif false
    print['uh oh']
else
    print['who even knows']
end

thing = if x > 2
    'x is bigger than two'
else
    'x is 2 or smaller'
end

noref = [x] { x += 1 }
y = 0
noref[y] # 1
y # 1

yesref = [^x] { x += 1 }
# yesref[y] # error
yesref[^y] # 1
y # 1
yesref[^y] # 2

counter = make_counter[0]
print[counter] # 1
print[counter] # 2
print[counter] # 3

t = (1,) # tuple
t2 = (1, "hello world") # more tuple
print[t.0] # 1
i = 1
print[t2.(i)] # hello world

i = 0
loop true
    i += 1
    print[i]
    if i > 5
        break
    end
end

# default parameter values
log = [msg="default used!"] { print["LOG: " + msg] }
log['parameter provided'] # > LOG: parameter provided
log # > LOG: default used!

# default parameters must be at the end
test = [a, b=1]{ a + b }
test[1]    # > 2
test[1, 2] # > 3

namespace hello {
    namespace world {
        yes = true
    }
}
print[hello::world::yes] # true

import test # imports a file named test (optional extensions)
import test::nested # imports namespace "nested" from file test,
                   # or file "nested[.lk]" from folder 'test'

nested::my_value = i

extern """import sys"""
input = extern "sys.stdin.readline().strip()"