https://github.com/ktravis/lark

An odd dynamic programming language, interpreted by Python
https://github.com/ktravis/lark

Last synced: about 2 months ago
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An odd dynamic programming language, interpreted by Python

• Host: GitHub
• URL: https://github.com/ktravis/lark
• Owner: ktravis
• Created: 2015-10-19T11:53:34.000Z (about 9 years ago)
• Default Branch: master
• Last Pushed: 2015-12-09T12:22:57.000Z (about 9 years ago)
• Last Synced: 2023-03-25T11:18:00.075Z (almost 2 years ago)
• Language: Python
• Size: 44.9 KB
• Stars: 2
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# 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

```bash

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()"

```