faaa97/egg-language-extended

EGG language compiler and interpreter

egg-language-extended

Extension of EloquentJS programming language.

• EGG Language
  • Tokens
  • Syntax
• How to use
  • install npm packages
  • Running tests
  • Executables
    • Running Egg-REPL
    • Running an EGG program
    • Parsing an EGG program
    • Running an EGG program via AST (json)

EGG Language

Tokens

WHITES            = /\s/y;
COMMENTS          = /#.*(\n|\r)?/y;
LEFT_PARENTHESIS  = /[(]/y;
RIGHT_PARENTHESIS = /[)]/y;
COMMA             = /,/y;
STRING            = /"([^"]*)"/y;
NUMBER            = /\d+\b/y;
WORD              = /[^\s(),#"]+/y;

Syntax

expression: ( STRING 
          | NUMBER 
          | WORD ) apply 

apply: /* vacio */
     | '(' (expression ',')* expression? ')' apply

How to use

install npm packages

First install npm packages:

$ npm install

Running tests

You can run all tests available with following command:

$ npm test

Executables

Then you can use bin/*.js executables to run examples/*.egg files, or any other file you create with EGG syntax.

Also you can use -h for help in any of these executables.

Running Egg-REPL

If you run bin/egg.js without any parameters, a REPL interface will launch up with the same capabilities as egg.js parser and interpreter.

$ node bin/egg.js
> Version 0.5.0
> help()
help() muestra esta ayuda.
exit() sale del bucle REPL.
Ctrl-D sale del bucle REPL.
'-------------------------'
> 

Running an EGG program

$ node bin/egg.js examples/one.egg

50

Parsing an EGG program

$ node bin/eggc.js examples/one.egg

Output in file 'examples/one.egg.evm'

examples/one.egg.evm:

{
  "type": "apply",
  "operator": {
    "type": "word",
    "name": "do"
  },
  "args": [
    {
      "type": "apply",
      "operator": {
        "type": "word",
        "name": "define"
      },
      "args": [
        {
          "type": "word",
          "name": "x"
        },
        {
          "type": "value",
          "value": 4
        }
      ]
    },
    . . .

Running an EGG program via AST (json)

$ node bin/evm.js examples/one.egg.evm

50