test-parser.ls

require! [jison, util]

Parser = jison.Parser

_  = (expr) ->
    rx = //
        ^function\s*\(\)\s*\{\s*
            (
                [\s\S]*
            );
        \s*\}
    //gmi
    "#expr".replace rx, (, a) -> a.replace /var \$\$;/ ''

grammar =
    lex :
        rules: [
            [ "\\s+"                                    '' ]
            [ "[0-9]+(?:\\.[0-9]+)?\\b"    _ ->    \NUMBER ]
            [ "="                          _ ->         \= ]
            [ "::"                         _ ->        \:: ]
            [ "(number|string)\\b"         _ ->      \TYPE ]
            [ "[a-zA-Z]+\\b"               _ ->        \ID ]
            [ "$"                          _ ->       \EOF ]
        ]
    operators: [
    ]

    bnf:
        expressions: [
            [ 'EXPR EOF' _ -> $1 ]
        ]
        EXPR: [
            [ 'ID :: TYPE = NUMBER' _ !-> $$ = id: $1, op: \= type: $3, val: Number($5) ]
        ]

parser = new Parser grammar

parserSource = parser.generate!

result = parser.parse 'foo:: string = 4'

console.log util.inspect result, false, 10, true

/*
    { id: 'foo',
      op: '=',
      type: 'string',
      val: 4 }
*/