BrightScript support written by a LLM

[walt93]

Check for existing issues

• Completed

Language

BrightScript

Tree Sitter parser link

No response

Language server link

No response

Misc notes

Multi-turn prompt for LLM:

1. Do you know the tree-sitter format from Github?
2. Do you know the Brightscript language by Roku?
3. Can you generate a tree-sitter specifcation for Brightscript?

Response: (this likely needs further promptgramming and/or someone with actual domain knowledge of tree-sitter)

// tree-sitter-brightscript/grammar.js
module.exports = grammar({
  name: 'brightscript',

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

  rules: {
    source_file: $ => repeat($._statement),

    _statement: $ => choice(
      $.assignment_statement,
      $.if_statement,
      $.while_statement,
      $.for_statement,
      $.function_declaration,
      $.return_statement,
      $.expression_statement
    ),

    assignment_statement: $ => seq(
      field('left', $.identifier),
      '=',
      field('right', $.expression),
      '\n'
    ),

    if_statement: $ => seq(
      'if',
      field('condition', $.expression),
      'then',
      repeat($._statement),
      optional(seq('else', repeat($._statement))),
      'end if'
    ),

    while_statement: $ => seq(
      'while',
      field('condition', $.expression),
      repeat($._statement),
      'end while'
    ),

    for_statement: $ => seq(
      'for',
      field('variable', $.identifier),
      '=',
      field('start', $.expression),
      'to',
      field('end', $.expression),
      optional(seq('step', field('step', $.expression))),
      repeat($._statement),
      'end for'
    ),

    function_declaration: $ => seq(
      'function',
      field('name', $.identifier),
      '(',
      optional($.parameter_list),
      ')',
      repeat($._statement),
      'end function'
    ),

    parameter_list: $ => commaSep1($.identifier),

    return_statement: $ => seq(
      'return',
      optional($.expression),
      '\n'
    ),

    expression_statement: $ => seq(
      $.expression,
      '\n'
    ),

    expression: $ => choice(
      $.identifier,
      $.number,
      $.string,
      $.binary_expression,
      $.function_call
    ),

    binary_expression: $ => prec.left(seq(
      field('left', $.expression),
      field('operator', choice('+', '-', '*', '/', '>', '<', '>=', '<=', '=', '<>')),
      field('right', $.expression)
    )),

    function_call: $ => seq(
      field('function', $.identifier),
      '(',
      optional($.argument_list),
      ')'
    ),

    argument_list: $ => commaSep1($.expression),

    identifier: $ => /[a-zA-Z_][a-zA-Z0-9_]*/,

    number: $ => /\d+(\.\d+)?/,

    string: $ => /"[^"]*"/,

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

function commaSep1(rule) {
  return seq(rule, repeat(seq(',', rule)));
}