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grammar.js
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grammar.js
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const C = require('tree-sitter-c/grammar');
const HLSL = require("tree-sitter-hlsl/grammar")
const PREC = Object.assign(C.PREC, {
IS: C.PREC.RELATIONAL + 1,
AS: C.PREC.RELATIONAL + 1,
});
module.exports = grammar(HLSL, {
name: 'slang',
conflicts: ($, original) => original.concat([
[$._declarator, $.type_hinted_declarator],
[$.type_specifier, $.compound_literal_expression],
[$.type_specifier, $._class_name],
[$._declaration_specifiers, $.declaration_list],
[$._declaration_specifiers, $._top_level_statement],
[$.declaration_list, $._empty_declaration],
]),
rules: {
_top_level_item: (_, original) => original,
_top_level_statement: ($, original) => choice(original, $.import_statement, $.type_specifier),
placeholder_type_specifier: $ => prec(1, seq(
field('constraint', optional($.type_specifier)),
choice("var", "let", "This"),
)),
init_declarator: $ => seq(
field('declarator', choice($._declarator, $.type_hinted_declarator)),
'=',
field('value', choice($.initializer_list, $.expression)),
),
declaration: $ => seq(
$._declaration_specifiers,
commaSep1(field('declarator', choice(
// type hint has ambiguity with semantics in struct declarations
seq(choice($._declarator, $.type_hinted_declarator), optional(alias(seq(':', $.expression), $.semantics))),
$.init_declarator
))),
';'
),
//compound_statement: $ => seq(
//'{',
//repeat(choice($._block_item, $.type_specifier)),
//'}',
//),
declaration_list: $ => seq(
'{',
repeat(choice($._block_item, $.type_specifier)),
'}',
),
type_hinted_declarator: $ => seq($.identifier, $.type_hint),
type_hint: $ => seq(":", $._type_declarator),
interface_specifier: $ => seq(
'interface',
$._class_declaration,
),
extension_specifier: $ => seq(
'extension',
$._class_declaration,
),
type_specifier: ($, original) => choice(original, $.interface_specifier, $.extension_specifier, $.associatedtype_specifier),
template_argument_list: $ => seq(
'<',
commaSep(choice(
prec.dynamic(4, seq("let", $.identifier, optional($.interface_requirements), optional(seq("=", $.expression)))),
prec.dynamic(3, seq($.type_descriptor, optional($.interface_requirements), optional(seq("=", $.type_descriptor)))),
prec.dynamic(2, alias($.type_parameter_pack_expansion, $.parameter_pack_expansion)),
prec.dynamic(1, $.expression),
)),
alias(token(prec(1, '>')), '>'),
),
interface_requirements: $ => prec.left(seq(":", andSep1($.identifier))),
_function_declarator_seq: ($, original) => seq(original, optional($.where_clause)),
where_clause: ($, original) => prec.right(seq("where", commaSep1(seq($.type_descriptor, optional($.interface_requirements), optional(seq("=", $.type_descriptor)))))),
binary_expression: ($, original) => {
const table = [
['is', PREC.IS],
['as', PREC.AS],
];
return choice(
...original.members,
...table.map(([operator, precedence]) => {
return prec.left(precedence, seq(
field('left', $.expression),
// @ts-ignore
field('operator', operator),
field('right', $.expression),
));
}));
},
import_statement: $ => seq(optional("__exported"), "import", dotSep1($.identifier), ";"),
_field_declaration_list_item: ($, original) => choice(original, $.property_declaration, $.subscript_declaration, $.init_declaration, $.associatedtype_declaration),
init_declaration: $ => seq("__init", $.parameter_list, $.compound_statement),
subscript_declaration: $ => seq("__subscript", $.parameter_list, optional($.trailing_return_type), alias(seq("{", repeat(choice($.property_get, $.property_set)), "}"), $.compound_statement)),
property_declaration: $ => seq("property",
choice(seq($.identifier, ":", $.type_descriptor),
seq($.type_descriptor, $.identifier)),
alias(seq("{", repeat(choice($.property_get, $.property_set)), "}"), $.compound_statement)),
property_get: $ => seq("get", choice($.compound_statement, ";")),
property_set: $ => seq("set", choice($.compound_statement, ";")),
associatedtype_declaration: $ => seq("associatedtype", $._type_identifier, optional($.base_class_clause), ";"),
associatedtype_specifier: $ => prec.right(seq($.type_specifier, ".", $.type_specifier))
},
});
function commaSep(rule) {
return optional(commaSep1(rule));
}
function commaSep1(rule) {
return seq(rule, repeat(seq(',', rule)))
}
function dotSep1(rule) {
return seq(rule, repeat(seq('.', rule)))
}
function andSep1(rule) {
return seq(rule, repeat(seq('&', rule)))
}