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// Tree-sitter grammar for the Fiddle hardware layout DSL.
// Mirrors the language accepted by src/Language/Fiddle/Parser.hs.
const commaSep1 = (rule) => seq(rule, repeat(seq(',', rule)));
const commaSep = (rule) => optional(commaSep1(rule));
module.exports = grammar({
name: 'fiddle',
extras: ($) => [/\s/, $.line_comment, $.doc_comment],
word: ($) => $.identifier,
rules: {
source_file: ($) => repeat($.declaration),
declaration: ($) =>
seq(repeat($.directive), choice(
$.option_decl,
$.package_decl,
$.using_decl,
$.import_decl,
$.location_decl,
$.bits_decl,
$.type_decl,
$.instance_decl
), ';'),
option_decl: ($) =>
seq(
'option',
field('name', $.identifier),
field('value', $.identifier)
),
package_decl: ($) =>
seq(
'package',
field('name', $.name),
field('body', $.package_body)
),
package_body: ($) =>
seq(
'{',
repeat(seq(repeat($.directive), choice(
$.option_decl,
$.using_decl,
$.import_decl,
$.location_decl,
$.bits_decl,
$.type_decl,
$.instance_decl
), ';')),
'}'
),
import_decl: ($) =>
seq(
'import',
field('path', $.string),
field('list', optional($.import_list))
),
import_list: ($) => seq('(', commaSep1($.identifier), ')'),
using_decl: ($) => seq('using', field('name', $.name)),
location_decl: ($) =>
seq(
'location',
field('name', $.identifier),
'=',
field('value', $.const_expression)
),
bits_decl: ($) =>
seq(
'bits',
field('name', $.identifier),
':',
field('type', $.bit_type)
),
bit_type: ($) =>
choice(
seq('(', field('width', $.expression), ')'),
seq('enum', field('width', $.expr_paren), field('body', $.enum_body))
),
enum_body: ($) =>
seq('{', commaSep(seq(repeat($.directive), $.enum_constant)), optional(','), '}'),
enum_constant: ($) =>
choice(
seq('reserved', '=', field('value', $.expression)),
seq(field('name', $.identifier), '=', field('value', $.const_expression))
),
type_decl: ($) =>
seq(
'type',
field('name', $.identifier),
':',
field('kind', $.body_type),
field('body', $.obj_type_body)
),
instance_decl: ($) =>
seq(
'instance',
field('name', $.identifier),
'at',
field('address', $.expression),
':',
field('type', $.obj_type)
),
obj_type: ($) =>
seq(
field('base', choice(
$.name,
seq(field('kind', $.body_type), field('body', $.obj_type_body))
)),
repeat($.array_extent)
),
obj_type_body: ($) =>
seq(
'{',
repeat(seq(repeat($.directive), $.obj_type_decl, ';')),
'}'
),
obj_type_decl: ($) =>
choice(
seq('assert_pos', field('target', $.expr_paren)),
seq('skip_to', field('offset', $.expr_paren)),
seq('buffer', field('name', optional($.identifier)), field('size', $.expr_paren)),
seq('reserved', field('size', $.expr_paren)),
seq(field('kind', $.body_type), field('body', $.obj_type_body), field('name', optional($.identifier))),
$.register_decl
),
register_decl: ($) =>
seq(
field('modifier', optional($.modifier)),
'reg',
field('name', optional($.identifier)),
field('width', $.expr_paren),
field('position', optional(seq('@', $.number))),
field('body', optional(seq(':', $.register_body)))
),
modifier: ($) => choice('ro', 'rw', 'wo'),
register_body: ($) =>
seq(
field('kind', $.bit_body_type),
field('body', $.register_bits_body)
),
bit_body_type: ($) => choice('struct', 'union'),
register_bits_body: ($) =>
seq(
'{',
repeat(seq(repeat($.directive), $.register_bits_decl, ';')),
'}'
),
register_bits_decl: ($) =>
choice(
seq('reserved', field('size', $.expr_paren)),
seq(
field('modifier', optional($.modifier)),
choice(
seq(field('body', $.register_body), field('name', optional($.identifier))),
seq(
field('name', $.identifier),
':',
field('type', $.register_bits_type_ref)
)
)
)
),
register_bits_type_ref: ($) =>
seq(
field('base', choice(
$.register_bits_width,
$.anonymous_bits_type,
$.name
)),
repeat($.array_extent)
),
register_bits_width: ($) => seq('(', field('width', $.const_expression), ')'),
anonymous_bits_type: ($) => seq('enum', field('width', $.expr_paren), field('body', $.enum_body)),
expr_paren: ($) => seq('(', $.expression, ')'),
array_extent: ($) => seq('[', field('size', $.const_expression), ']'),
body_type: ($) => choice('struct', 'union'),
const_expression: ($) => $.expression,
expression: ($) => choice($.number, $.name),
name: ($) => seq($.identifier, repeat(seq('.', $.identifier))),
directive: ($) => seq('[[', commaSep($.directive_element), ']]'),
directive_element: ($) =>
choice(
seq(
field('backend', $.identifier),
':',
field('key', $.identifier),
optional(seq('=', field('value', $.directive_value)))
),
seq(field('key', $.identifier), '=', field('value', $.directive_value)),
field('key', $.identifier)
),
directive_value: ($) => choice($.string, $.number),
identifier: ($) => token(prec(-1, /[A-Za-z_][A-Za-z0-9_]*/)),
number: ($) => token(/[0-9][0-9A-Za-z_]*/),
string: ($) => token(seq('"', repeat(choice(/[^"\\]/, /\\./)), '"')),
line_comment: ($) => token(seq('//', /.*/)),
doc_comment: ($) => token(seq('/**', /[^*]*\*+(?:[^/*][^*]*\*+)*/, '/')),
},
});
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