module.exports = grammar({

name: 'test_grammar',

extras: $ => [/\s/, $.comment],

rules: {

expression: $ => choice(

),

sum: $ => prec.left(1, seq(field('left', $.expression), '+', field('right', $.expression))),

number: $ => /\d+/,

comment: $ => token(seq('//', /.*/)),

variable: $ => /[a-zA-Z]\\w*/,

}

});