module.exports = grammar({
    name: 'Groovy',
    conflicts: $ => [
        [$.qualified_name]
    ],
    rules: {
        // TODO: add the actual grammar rules
        source_file: $ => seq(
            optional($._shebang_comment),
            optional(seq($.package_declaration, repeat($._sep))),
            optional($._script_statements)
        ),
        static_modifier: $ => 'static',
        _shebang_comment: $ => token.immediate(/#!.*\n/),
        _script_statements: $ => seq(
            $._script_statement,
            repeat(
                seq(
                    $._sep,
                    $._script_statement
                )
            ),
            repeat($._sep)
        ),
        import_declaration: $ => seq(
            'import',
            optional($.static_modifier),
            field('name',
                seq($.qualified_name,
                    optional($.wildcard_import)
                )
            )
        ),
        wildcard_import: $ => seq('.','*'),
        package_declaration: $ => seq(
            optional($._annotations),
            'package',
            field('name', $.qualified_name)
        ),
        _annotations: $ => seq(
            $.annotation, 
            repeat($.annotation)
        ),
        annotation: $ => seq(
            '@',
            $.qualified_name
        ),
        _script_statement: $ => choice(
            $.import_declaration,
            $.statement,
            $.method_declaration
        ),
        expression: $ => choice(
            $.qualified_name
        ),
        qualified_name: $ => seq(
            $.identifier,
            repeat(seq('.', $.identifier))
        ),
        identifier: $ => /[A-Za-z_][A-Za-z_0-9]*/,
        statement: $ => choice(
            $.expression
        ),
        method_declaration: $ => seq('def', field('name', $.identifier)),
        _sep: $ => choice('\n', ';'),
        word: $ => $.identifier
    }
});