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grammar.js
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/**
* @file C grammar for tree-sitter
* @author Max Brunsfeld
* @license MIT
*/
/* eslint-disable arrow-parens */
/* eslint-disable camelcase */
/* eslint-disable-next-line spaced-comment */
/// <reference types="tree-sitter-cli/dsl" />
// @ts-check
const PREC = {
PAREN_DECLARATOR: -10,
ASSIGNMENT: -2,
CONDITIONAL: -1,
DEFAULT: 0,
LOGICAL_OR: 1,
LOGICAL_AND: 2,
INCLUSIVE_OR: 3,
EXCLUSIVE_OR: 4,
BITWISE_AND: 5,
EQUAL: 6,
RELATIONAL: 7,
OFFSETOF: 8,
SHIFT: 9,
ADD: 10,
MULTIPLY: 11,
CAST: 12,
SIZEOF: 13,
UNARY: 14,
CALL: 15,
FIELD: 16,
SUBSCRIPT: 17,
};
module.exports = grammar({
name: 'c',
extras: $ => [
/\s|\\\r?\n/,
$.comment,
],
inline: $ => [
$._statement,
$._block_item,
$._top_level_item,
$._top_level_statement,
$._type_identifier,
$._field_identifier,
$._statement_identifier,
$._non_case_statement,
$._assignment_left_expression,
],
conflicts: $ => [
[$._type_specifier, $._declarator],
[$._type_specifier, $._declarator, $.macro_type_specifier],
[$._type_specifier, $._expression_not_binary],
[$._type_specifier, $._expression_not_binary, $.macro_type_specifier],
[$._type_specifier, $.macro_type_specifier],
[$.sized_type_specifier],
[$.attributed_statement],
[$._declaration_modifiers, $.attributed_statement],
[$.enum_specifier],
[$._type_specifier, $._old_style_parameter_list],
[$.parameter_list, $._old_style_parameter_list],
[$._enumerator_list_item, $._enumerator_list_item_end],
[$.preproc_ifdef_in_enumerator_list, $.preproc_ifdef_in_enumerator_list_end],
[$.preproc_else_in_enumerator_list, $.preproc_else_in_enumerator_list_end],
[$.preproc_if_in_enumerator_list, $.preproc_if_in_enumerator_list_end],
[$.preproc_elif_in_enumerator_list, $.preproc_elif_in_enumerator_list_end],
],
word: $ => $.identifier,
rules: {
translation_unit: $ => repeat($._top_level_item),
// Top level items are block items with the exception of the expression statement
_top_level_item: $ => choice(
$.function_definition,
alias($._old_style_function_definition, $.function_definition),
$.linkage_specification,
$.declaration,
$._top_level_statement,
$.attributed_statement,
$.type_definition,
$._empty_declaration,
$.preproc_if,
$.preproc_ifdef,
$.preproc_include,
$.preproc_def,
$.preproc_function_def,
$.preproc_call,
),
_block_item: $ => choice(
$.function_definition,
alias($._old_style_function_definition, $.function_definition),
$.linkage_specification,
$.declaration,
$._statement,
$.attributed_statement,
$.type_definition,
$._empty_declaration,
$.preproc_if,
$.preproc_ifdef,
$.preproc_include,
$.preproc_def,
$.preproc_function_def,
$.preproc_call,
),
// Preprocesser
preproc_include: $ => seq(
preprocessor('include'),
field('path', choice(
$.string_literal,
$.system_lib_string,
$.identifier,
alias($.preproc_call_expression, $.call_expression),
)),
token.immediate(/\r?\n/),
),
preproc_def: $ => seq(
preprocessor('define'),
field('name', $.identifier),
field('value', optional($.preproc_arg)),
token.immediate(/\r?\n/),
),
preproc_function_def: $ => seq(
preprocessor('define'),
field('name', $.identifier),
field('parameters', $.preproc_params),
field('value', optional($.preproc_arg)),
token.immediate(/\r?\n/),
),
preproc_params: $ => seq(
token.immediate('('), commaSep(choice($.identifier, '...')), ')',
),
preproc_call: $ => seq(
field('directive', $.preproc_directive),
field('argument', optional($.preproc_arg)),
token.immediate(/\r?\n/),
),
...preprocIf('', $ => $._block_item),
...preprocIf('_in_field_declaration_list', $ => $._field_declaration_list_item),
...preprocIf('_in_enumerator_list', $ => $._enumerator_list_item),
...preprocIf('_in_enumerator_list_end', $ => $._enumerator_list_item_end),
preproc_arg: _ => token(prec(-1, /\S([^/\n]|\/[^*]|\\\r?\n)*/)),
preproc_directive: _ => /#[ \t]*[a-zA-Z0-9]\w*/,
_preproc_expression: $ => choice(
$.identifier,
alias($.preproc_call_expression, $.call_expression),
$.number_literal,
$.char_literal,
$.preproc_defined,
alias($.preproc_unary_expression, $.unary_expression),
alias($.preproc_binary_expression, $.binary_expression),
alias($.preproc_parenthesized_expression, $.parenthesized_expression),
),
preproc_parenthesized_expression: $ => seq(
'(',
$._preproc_expression,
')',
),
preproc_defined: $ => choice(
prec(PREC.CALL, seq('defined', '(', $.identifier, ')')),
seq('defined', $.identifier),
),
preproc_unary_expression: $ => prec.left(PREC.UNARY, seq(
field('operator', choice('!', '~', '-', '+')),
field('argument', $._preproc_expression),
)),
preproc_call_expression: $ => prec(PREC.CALL, seq(
field('function', $.identifier),
field('arguments', alias($.preproc_argument_list, $.argument_list)),
)),
preproc_argument_list: $ => seq(
'(',
commaSep($._preproc_expression),
')',
),
preproc_binary_expression: $ => {
const table = [
['+', PREC.ADD],
['-', PREC.ADD],
['*', PREC.MULTIPLY],
['/', PREC.MULTIPLY],
['%', PREC.MULTIPLY],
['||', PREC.LOGICAL_OR],
['&&', PREC.LOGICAL_AND],
['|', PREC.INCLUSIVE_OR],
['^', PREC.EXCLUSIVE_OR],
['&', PREC.BITWISE_AND],
['==', PREC.EQUAL],
['!=', PREC.EQUAL],
['>', PREC.RELATIONAL],
['>=', PREC.RELATIONAL],
['<=', PREC.RELATIONAL],
['<', PREC.RELATIONAL],
['<<', PREC.SHIFT],
['>>', PREC.SHIFT],
];
return choice(...table.map(([operator, precedence]) => {
return prec.left(precedence, seq(
field('left', $._preproc_expression),
// @ts-ignore
field('operator', operator),
field('right', $._preproc_expression),
));
}));
},
// Main Grammar
function_definition: $ => seq(
optional($.ms_call_modifier),
$._declaration_specifiers,
field('declarator', $._declarator),
field('body', $.compound_statement),
),
_old_style_function_definition: $ => seq(
optional($.ms_call_modifier),
$._declaration_specifiers,
field('declarator', alias($._old_style_function_declarator, $.function_declarator)),
repeat($.declaration),
field('body', $.compound_statement),
),
declaration: $ => seq(
$._declaration_specifiers,
$._declaration_declarator,
';',
),
_declaration_declarator: $ => commaSep1(field('declarator', choice(
seq($._declarator, optional($.gnu_asm_expression)),
$.init_declarator,
))),
type_definition: $ => seq(
optional('__extension__'),
'typedef',
$._type_definition_type,
$._type_definition_declarators,
repeat($.attribute_specifier),
';',
),
_type_definition_type: $ => seq(repeat($.type_qualifier), field('type', $._type_specifier), repeat($.type_qualifier)),
_type_definition_declarators: $ => commaSep1(field('declarator', $._type_declarator)),
_declaration_modifiers: $ => choice(
$.storage_class_specifier,
$.type_qualifier,
$.attribute_specifier,
$.attribute_declaration,
$.ms_declspec_modifier,
),
_declaration_specifiers: $ => prec.right(seq(
repeat($._declaration_modifiers),
field('type', $._type_specifier),
repeat($._declaration_modifiers),
)),
linkage_specification: $ => seq(
'extern',
field('value', $.string_literal),
field('body', choice(
$.function_definition,
$.declaration,
$.declaration_list,
)),
),
attribute_specifier: $ => seq(
'__attribute__',
'(',
$.argument_list,
')',
),
attribute: $ => seq(
optional(seq(field('prefix', $.identifier), '::')),
field('name', $.identifier),
optional($.argument_list),
),
attribute_declaration: $ => seq(
'[[',
commaSep1($.attribute),
']]',
),
ms_declspec_modifier: $ => seq(
'__declspec',
'(',
$.identifier,
')',
),
ms_based_modifier: $ => seq(
'__based',
$.argument_list,
),
ms_call_modifier: _ => choice(
'__cdecl',
'__clrcall',
'__stdcall',
'__fastcall',
'__thiscall',
'__vectorcall',
),
ms_restrict_modifier: _ => '__restrict',
ms_unsigned_ptr_modifier: _ => '__uptr',
ms_signed_ptr_modifier: _ => '__sptr',
ms_unaligned_ptr_modifier: _ => choice('_unaligned', '__unaligned'),
ms_pointer_modifier: $ => choice(
$.ms_unaligned_ptr_modifier,
$.ms_restrict_modifier,
$.ms_unsigned_ptr_modifier,
$.ms_signed_ptr_modifier,
),
declaration_list: $ => seq(
'{',
repeat($._block_item),
'}',
),
_declarator: $ => choice(
$.attributed_declarator,
$.pointer_declarator,
$.function_declarator,
$.array_declarator,
$.parenthesized_declarator,
$.identifier,
),
_field_declarator: $ => choice(
alias($.attributed_field_declarator, $.attributed_declarator),
alias($.pointer_field_declarator, $.pointer_declarator),
alias($.function_field_declarator, $.function_declarator),
alias($.array_field_declarator, $.array_declarator),
alias($.parenthesized_field_declarator, $.parenthesized_declarator),
$._field_identifier,
),
_type_declarator: $ => choice(
alias($.attributed_type_declarator, $.attributed_declarator),
alias($.pointer_type_declarator, $.pointer_declarator),
alias($.function_type_declarator, $.function_declarator),
alias($.array_type_declarator, $.array_declarator),
alias($.parenthesized_type_declarator, $.parenthesized_declarator),
$._type_identifier,
alias(choice('signed', 'unsigned', 'long', 'short'), $.primitive_type),
$.primitive_type,
),
_abstract_declarator: $ => choice(
$.abstract_pointer_declarator,
$.abstract_function_declarator,
$.abstract_array_declarator,
$.abstract_parenthesized_declarator,
),
parenthesized_declarator: $ => prec.dynamic(PREC.PAREN_DECLARATOR, seq(
'(',
$._declarator,
')',
)),
parenthesized_field_declarator: $ => prec.dynamic(PREC.PAREN_DECLARATOR, seq(
'(',
$._field_declarator,
')',
)),
parenthesized_type_declarator: $ => prec.dynamic(PREC.PAREN_DECLARATOR, seq(
'(',
$._type_declarator,
')',
)),
abstract_parenthesized_declarator: $ => prec(1, seq(
'(',
$._abstract_declarator,
')',
)),
attributed_declarator: $ => prec.right(seq(
$._declarator,
repeat1($.attribute_declaration),
)),
attributed_field_declarator: $ => prec.right(seq(
$._field_declarator,
repeat1($.attribute_declaration),
)),
attributed_type_declarator: $ => prec.right(seq(
$._type_declarator,
repeat1($.attribute_declaration),
)),
pointer_declarator: $ => prec.dynamic(1, prec.right(seq(
optional($.ms_based_modifier),
'*',
repeat($.ms_pointer_modifier),
repeat($.type_qualifier),
field('declarator', $._declarator),
))),
pointer_field_declarator: $ => prec.dynamic(1, prec.right(seq(
optional($.ms_based_modifier),
'*',
repeat($.ms_pointer_modifier),
repeat($.type_qualifier),
field('declarator', $._field_declarator),
))),
pointer_type_declarator: $ => prec.dynamic(1, prec.right(seq(
optional($.ms_based_modifier),
'*',
repeat($.ms_pointer_modifier),
repeat($.type_qualifier),
field('declarator', $._type_declarator),
))),
abstract_pointer_declarator: $ => prec.dynamic(1, prec.right(seq('*',
repeat($.type_qualifier),
field('declarator', optional($._abstract_declarator)),
))),
function_declarator: $ => prec.right(1,
seq(
field('declarator', $._declarator),
field('parameters', $.parameter_list),
optional($.gnu_asm_expression),
repeat($.attribute_specifier),
)),
function_field_declarator: $ => prec(1, seq(
field('declarator', $._field_declarator),
field('parameters', $.parameter_list),
)),
function_type_declarator: $ => prec(1, seq(
field('declarator', $._type_declarator),
field('parameters', $.parameter_list),
)),
abstract_function_declarator: $ => prec(1, seq(
field('declarator', optional($._abstract_declarator)),
field('parameters', $.parameter_list),
)),
_old_style_function_declarator: $ => seq(
field('declarator', $._declarator),
field('parameters', alias($._old_style_parameter_list, $.parameter_list)),
),
array_declarator: $ => prec(1, seq(
field('declarator', $._declarator),
'[',
repeat($.type_qualifier),
field('size', optional(choice($._expression, '*'))),
']',
)),
array_field_declarator: $ => prec(1, seq(
field('declarator', $._field_declarator),
'[',
repeat($.type_qualifier),
field('size', optional(choice($._expression, '*'))),
']',
)),
array_type_declarator: $ => prec(1, seq(
field('declarator', $._type_declarator),
'[',
repeat($.type_qualifier),
field('size', optional(choice($._expression, '*'))),
']',
)),
abstract_array_declarator: $ => prec(1, seq(
field('declarator', optional($._abstract_declarator)),
'[',
repeat($.type_qualifier),
field('size', optional(choice($._expression, '*'))),
']',
)),
init_declarator: $ => seq(
field('declarator', $._declarator),
'=',
field('value', choice($.initializer_list, $._expression)),
),
compound_statement: $ => seq(
'{',
repeat($._block_item),
'}',
),
storage_class_specifier: _ => choice(
'extern',
'static',
'auto',
'register',
'inline',
'__inline',
'__inline__',
'__forceinline',
'thread_local',
'__thread',
),
type_qualifier: _ => choice(
'const',
'constexpr',
'volatile',
'restrict',
'__restrict__',
'__extension__',
'_Atomic',
'_Noreturn',
'noreturn',
),
_type_specifier: $ => choice(
$.struct_specifier,
$.union_specifier,
$.enum_specifier,
$.macro_type_specifier,
$.sized_type_specifier,
$.primitive_type,
$._type_identifier,
),
sized_type_specifier: $ => seq(
repeat1(choice(
'signed',
'unsigned',
'long',
'short',
)),
field('type', optional(choice(
prec.dynamic(-1, $._type_identifier),
$.primitive_type,
))),
),
primitive_type: _ => token(choice(
'bool',
'char',
'int',
'float',
'double',
'void',
'size_t',
'ssize_t',
'ptrdiff_t',
'intptr_t',
'uintptr_t',
'charptr_t',
'nullptr_t',
'max_align_t',
...[8, 16, 32, 64].map(n => `int${n}_t`),
...[8, 16, 32, 64].map(n => `uint${n}_t`),
...[8, 16, 32, 64].map(n => `char${n}_t`),
)),
enum_specifier: $ => seq(
'enum',
choice(
seq(
field('name', $._type_identifier),
optional(seq(':', field('underlying_type', $.primitive_type))),
field('body', optional($.enumerator_list)),
),
field('body', $.enumerator_list),
),
optional($.attribute_specifier),
),
enumerator_list: $ => seq(
'{',
repeat($._enumerator_list_item),
optional($._enumerator_list_item_end),
'}',
),
struct_specifier: $ => prec.right(seq(
'struct',
optional($.attribute_specifier),
optional($.ms_declspec_modifier),
choice(
seq(
field('name', $._type_identifier),
field('body', optional($.field_declaration_list)),
),
field('body', $.field_declaration_list),
),
optional($.attribute_specifier),
)),
union_specifier: $ => prec.right(seq(
'union',
optional($.ms_declspec_modifier),
choice(
seq(
field('name', $._type_identifier),
field('body', optional($.field_declaration_list)),
),
field('body', $.field_declaration_list),
),
optional($.attribute_specifier),
)),
field_declaration_list: $ => seq(
'{',
repeat($._field_declaration_list_item),
'}',
),
_field_declaration_list_item: $ => choice(
$.field_declaration,
$.preproc_def,
$.preproc_function_def,
$.preproc_call,
alias($.preproc_if_in_field_declaration_list, $.preproc_if),
alias($.preproc_ifdef_in_field_declaration_list, $.preproc_ifdef),
),
field_declaration: $ => seq(
$._declaration_specifiers,
optional($._field_declaration_declarator),
optional($.attribute_specifier),
';',
),
_field_declaration_declarator: $ => commaSep1(seq(
field('declarator', $._field_declarator),
optional($.bitfield_clause),
)),
bitfield_clause: $ => seq(':', $._expression),
enumerator: $ => seq(
field('name', $.identifier),
optional(seq('=', field('value', $._expression))),
),
_enumerator_list_item: $ => choice(
seq($.enumerator, ','),
$.preproc_def,
$.preproc_function_def,
$.preproc_call,
alias($.preproc_if_in_enumerator_list, $.preproc_if),
alias($.preproc_ifdef_in_enumerator_list, $.preproc_ifdef),
),
_enumerator_list_item_end: $ => choice(
$.enumerator,
$.preproc_def,
$.preproc_function_def,
$.preproc_call,
alias($.preproc_if_in_enumerator_list_end, $.preproc_if),
alias($.preproc_ifdef_in_enumerator_list_end, $.preproc_ifdef),
),
variadic_parameter: _ => seq(
'...',
),
parameter_list: $ => seq(
'(',
commaSep(choice($.parameter_declaration, $.variadic_parameter)),
')',
),
_old_style_parameter_list: $ => seq(
'(',
commaSep(choice($.identifier, $.variadic_parameter)),
')',
),
parameter_declaration: $ => seq(
$._declaration_specifiers,
optional(field('declarator', choice(
$._declarator,
$._abstract_declarator,
))),
),
// Statements
attributed_statement: $ => seq(
repeat1($.attribute_declaration),
$._statement,
),
_statement: $ => choice(
$.case_statement,
$._non_case_statement,
),
_non_case_statement: $ => choice(
$.attributed_statement,
$.labeled_statement,
$.compound_statement,
$.expression_statement,
$.if_statement,
$.switch_statement,
$.do_statement,
$.while_statement,
$.for_statement,
$.return_statement,
$.break_statement,
$.continue_statement,
$.goto_statement,
$.seh_try_statement,
$.seh_leave_statement,
),
_top_level_statement: $ => choice(
$.case_statement,
$.attributed_statement,
$.labeled_statement,
$.compound_statement,
alias($._top_level_expression_statement, $.expression_statement),
$.if_statement,
$.switch_statement,
$.do_statement,
$.while_statement,
$.for_statement,
$.return_statement,
$.break_statement,
$.continue_statement,
$.goto_statement,
),
labeled_statement: $ => seq(
field('label', $._statement_identifier),
':',
$._statement,
),
// This is missing binary expressions, others were kept so that macro code can be parsed better and code examples
_top_level_expression_statement: $ => seq(
$._expression_not_binary,
';',
),
expression_statement: $ => seq(
optional(choice(
$._expression,
$.comma_expression,
)),
';',
),
if_statement: $ => prec.right(seq(
'if',
field('condition', $.parenthesized_expression),
field('consequence', $._statement),
optional(field('alternative', $.else_clause)),
)),
else_clause: $ => seq('else', $._statement),
switch_statement: $ => seq(
'switch',
field('condition', $.parenthesized_expression),
field('body', $.compound_statement),
),
case_statement: $ => prec.right(seq(
choice(
seq('case', field('value', $._expression)),
'default',
),
':',
repeat(choice(
$._non_case_statement,
$.declaration,
$.type_definition,
)),
)),
while_statement: $ => seq(
'while',
field('condition', $.parenthesized_expression),
field('body', $._statement),
),
do_statement: $ => seq(
'do',
field('body', $._statement),
'while',
field('condition', $.parenthesized_expression),
';',
),
for_statement: $ => seq(
'for',
'(',
$._for_statement_body,
')',
field('body', $._statement),
),
_for_statement_body: $ => seq(
choice(
field('initializer', $.declaration),
seq(field('initializer', optional(choice($._expression, $.comma_expression))), ';'),
),
field('condition', optional(choice($._expression, $.comma_expression))),
';',
field('update', optional(choice($._expression, $.comma_expression))),
),
return_statement: $ => seq(
'return',
optional(choice($._expression, $.comma_expression)),
';',
),
break_statement: _ => seq(
'break', ';',
),
continue_statement: _ => seq(
'continue', ';',
),
goto_statement: $ => seq(
'goto',
field('label', $._statement_identifier),
';',
),
seh_try_statement: $ => seq(
'__try',
field('body', $.compound_statement),
choice($.seh_except_clause, $.seh_finally_clause),
),
seh_except_clause: $ => seq(
'__except',
field('filter', $.parenthesized_expression),
field('body', $.compound_statement),
),
seh_finally_clause: $ => seq(
'__finally',
field('body', $.compound_statement),
),
seh_leave_statement: _ => seq(
'__leave', ';',
),
// Expressions
_expression: $ => choice(
$._expression_not_binary,
$.binary_expression,
),
_expression_not_binary: $ => choice(
$.conditional_expression,
$.assignment_expression,
$.unary_expression,
$.update_expression,
$.cast_expression,
$.pointer_expression,
$.sizeof_expression,
$.alignof_expression,
$.offsetof_expression,
$.generic_expression,
$.subscript_expression,
$.call_expression,
$.field_expression,
$.compound_literal_expression,
$.identifier,
$.number_literal,
$.string_literal,
$.true,
$.false,
$.null,
$.concatenated_string,
$.char_literal,
$.parenthesized_expression,
$.gnu_asm_expression,
),
comma_expression: $ => seq(
field('left', $._expression),
',',
field('right', choice($._expression, $.comma_expression)),
),
conditional_expression: $ => prec.right(PREC.CONDITIONAL, seq(
field('condition', $._expression),
'?',
optional(field('consequence', $._expression)),
':',
field('alternative', $._expression),
)),
_assignment_left_expression: $ => choice(
$.identifier,
$.call_expression,
$.field_expression,
$.pointer_expression,
$.subscript_expression,
$.parenthesized_expression,
),
assignment_expression: $ => prec.right(PREC.ASSIGNMENT, seq(
field('left', $._assignment_left_expression),
field('operator', choice(
'=',
'*=',
'/=',
'%=',
'+=',
'-=',
'<<=',
'>>=',
'&=',
'^=',
'|=',
)),
field('right', $._expression),
)),
pointer_expression: $ => prec.left(PREC.CAST, seq(
field('operator', choice('*', '&')),
field('argument', $._expression),
)),
unary_expression: $ => prec.left(PREC.UNARY, seq(
field('operator', choice('!', '~', '-', '+')),
field('argument', $._expression),
)),
binary_expression: $ => {
const table = [
['+', PREC.ADD],
['-', PREC.ADD],
['*', PREC.MULTIPLY],
['/', PREC.MULTIPLY],
['%', PREC.MULTIPLY],
['||', PREC.LOGICAL_OR],
['&&', PREC.LOGICAL_AND],
['|', PREC.INCLUSIVE_OR],
['^', PREC.EXCLUSIVE_OR],
['&', PREC.BITWISE_AND],
['==', PREC.EQUAL],
['!=', PREC.EQUAL],
['>', PREC.RELATIONAL],
['>=', PREC.RELATIONAL],
['<=', PREC.RELATIONAL],
['<', PREC.RELATIONAL],
['<<', PREC.SHIFT],
['>>', PREC.SHIFT],
];
return choice(...table.map(([operator, precedence]) => {
return prec.left(precedence, seq(
field('left', $._expression),
// @ts-ignore
field('operator', operator),
field('right', $._expression),
));
}));
},
update_expression: $ => {
const argument = field('argument', $._expression);
const operator = field('operator', choice('--', '++'));
return prec.right(PREC.UNARY, choice(
seq(operator, argument),
seq(argument, operator),
));
},
cast_expression: $ => prec(PREC.CAST, seq(