eslang

Espresso Script Language - eslang

A simple & expressive script language, which is inspired by Lisp, Python, JavaScript and many other great languages.

print "Hello, world!";

# or, without sweetener
(print "Hello, world!")

# or, with some decoration
printf "Hello, world!\n", "green bold underline";

Try it online

Espresso Web Shell

help; # for help.

# verify your browser's compatibility.
selftest;

# run a quick-sort example
run "examples/qsort1";

# print its code
print (.loader read "examples/qsort1");

# list all examples
.loader list "examples/";

# use print to show a full list.
print (.loader list "examples/");

# break items into lines
.loader list "examples/":: for-each print;

# display file url only
.loader list "examples/":: for-each (= item (print (item 0);

# display item no. for counting
.loader list "examples/":: for-each (= (item, no.) (print '#$(no.), $(item 0)');

 # display path only
.loader list "examples/":: for-each (= (item, no.) (print '#$(no.),', (var url (item 0):: slice (url first-of "examples/");

# Q: What's happening?
var print-examples (=>:() (var examples (.loader list "examples/")) (=> pattern (examples for-each (=> (item, no.) (print (string format (pattern ?* "{0}, {1}, {2}"), no., (item 0), (item 1);

# As a hint, here's a (more) friendly version.
(var print-examples (=>:()
  var examples (.loader list "examples/");
  (=> pattern
    (examples for-each (=> (item, no.)
      print (string format (pattern ?* "{0}, {1}, {2}"), no., (item 0), (item 1);
).

# You may also want to check
print print-examples;

# Finally, the Y-combinator in Espresso
print (.loader read "yc");

Install it

npm i -g eslang

es selftest # optional

run an example, or your own code:

es examples/qsort1

REPL in terminal:

es

You can do almost the same things after calling

fetch "https://eslang.dev/@";

# or try
fetch "https://eslang.dev/@":: finally (=>() (.loader list:: for-each print);

Use it in your JS project

add it

npm i --save eslang

use it

var $void = require('eslang')()
$void.$run('path-to-your-app.es')

use es-npm to create projects

npm i -g @eslang/es-npm
es-npm

Check the source code

git clone https://github.com/NirlStudio/eslang.git
cd eslang

npm install
npm test

bin/es

# or, start the local web shell
npm run build & npm start

IDE Support

VS Code Extension

In Extensions sidebar, search for eslang

Atom Plugin

language-espresso

apm install language-espresso

You can help to

- Test it in various OSes and browsers.

- Use it in your projects.

- Recommend it to your friends.

- Create documentation & tools.

- Report bugs and help to fix.

- Request for features.

- Create interpreters in other native languages

• Java, Go, Rust, Python, C#, C, etc

- ...

Enjoy the Espresso.