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grammar.js
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/**
* @file Java grammar for tree-sitter
* @author Ayman Nadeem <aymannadeem@github.com>
* @author Max Brunsfeld <maxbrunsfeld@gmail.com>
* @author Amaan Qureshi <amaanq12@gmail.com>
* @author Nanashi Li <nanashili@auroraeditor.com>
* @license MIT
*/
/// <reference types="tree-sitter-cli/dsl" />
// @ts-check
const DIGITS = token(choice('0', seq(/[1-9]/, optional(seq(optional('_'), sep1(/[0-9]+/, /_+/))))));
const DECIMAL_DIGITS = token(sep1(/[0-9]+/, '_'));
const HEX_DIGITS = token(sep1(/[A-Fa-f0-9]+/, '_'));
/* eslint-disable no-multi-spaces */
const PREC = {
// https://introcs.cs.princeton.edu/java/11precedence/
COMMENT: 0, // // /* */
ASSIGN: 1, // = += -= *= /= %= &= ^= |= <<= >>= >>>=
DECL: 2,
ELEMENT_VAL: 2,
TERNARY: 3, // ?:
OR: 4, // ||
AND: 5, // &&
BIT_OR: 6, // |
BIT_XOR: 7, // ^
BIT_AND: 8, // &
EQUALITY: 9, // == !=
GENERIC: 10,
REL: 10, // < <= > >= instanceof
SHIFT: 11, // << >> >>>
ADD: 12, // + -
MULT: 13, // * / %
CAST: 14, // (Type)
OBJ_INST: 14, // new
UNARY: 15, // ++a --a a++ a-- + - ! ~
ARRAY: 16, // [Index]
OBJ_ACCESS: 16, // .
PARENS: 16, // (Expression)
CLASS_LITERAL: 17, // .
};
/* eslint-enable no-multi-spaces */
module.exports = grammar({
name: 'java',
extras: $ => [
$.line_comment,
$.block_comment,
/\s/,
],
supertypes: $ => [
$.expression,
$.declaration,
$.statement,
$.primary_expression,
$._literal,
$._type,
$._simple_type,
$._unannotated_type,
$.comment,
$.module_directive,
],
inline: $ => [
$._name,
$._simple_type,
$._class_body_declaration,
$._variable_initializer,
],
conflicts: $ => [
[$.modifiers, $.annotated_type, $.receiver_parameter],
[$.modifiers, $.annotated_type, $.module_declaration, $.package_declaration],
[$._unannotated_type, $.primary_expression, $.inferred_parameters],
[$._unannotated_type, $.primary_expression],
[$._unannotated_type, $.primary_expression, $.scoped_type_identifier],
[$._unannotated_type, $.scoped_type_identifier],
[$._unannotated_type, $.generic_type],
[$.generic_type, $.primary_expression],
[$.expression, $.statement],
// Only conflicts in switch expressions
[$.lambda_expression, $.primary_expression],
[$.inferred_parameters, $.primary_expression],
[$.argument_list, $.record_pattern_body],
],
word: $ => $.identifier,
rules: {
program: $ => repeat($._toplevel_statement),
_toplevel_statement: $ => choice(
$.statement,
$.method_declaration,
),
// Literals
_literal: $ => choice(
$.decimal_integer_literal,
$.hex_integer_literal,
$.octal_integer_literal,
$.binary_integer_literal,
$.decimal_floating_point_literal,
$.hex_floating_point_literal,
$.true,
$.false,
$.character_literal,
$.string_literal,
$.null_literal,
),
decimal_integer_literal: _ => token(seq(
DIGITS,
optional(choice('l', 'L')),
)),
hex_integer_literal: _ => token(seq(
choice('0x', '0X'),
HEX_DIGITS,
optional(choice('l', 'L')),
)),
octal_integer_literal: _ => token(seq(
choice('0o', '0O', '0'),
sep1(/[0-7]+/, '_'),
optional(choice('l', 'L')),
)),
binary_integer_literal: _ => token(seq(
choice('0b', '0B'),
sep1(/[01]+/, '_'),
optional(choice('l', 'L')),
)),
decimal_floating_point_literal: _ => token(choice(
seq(DECIMAL_DIGITS, '.', optional(DECIMAL_DIGITS), optional(seq((/[eE]/), optional(choice('-', '+')), DECIMAL_DIGITS)), optional(/[fFdD]/)),
seq('.', DECIMAL_DIGITS, optional(seq((/[eE]/), optional(choice('-', '+')), DECIMAL_DIGITS)), optional(/[fFdD]/)),
seq(DIGITS, /[eEpP]/, optional(choice('-', '+')), DECIMAL_DIGITS, optional(/[fFdD]/)),
seq(DIGITS, optional(seq((/[eE]/), optional(choice('-', '+')), DECIMAL_DIGITS)), (/[fFdD]/)),
)),
hex_floating_point_literal: _ => token(seq(
choice('0x', '0X'),
choice(
seq(HEX_DIGITS, optional('.')),
seq(optional(HEX_DIGITS), '.', HEX_DIGITS),
),
optional(seq(
/[eEpP]/,
optional(choice('-', '+')),
DIGITS,
optional(/[fFdD]/),
)),
)),
true: _ => 'true',
false: _ => 'false',
character_literal: _ => token(seq(
'\'',
repeat1(choice(
/[^\\'\n]/,
/\\./,
/\\\n/,
)),
'\'',
)),
string_literal: $ => choice($._string_literal, $._multiline_string_literal),
_string_literal: $ => seq(
'"',
repeat(choice(
$.string_fragment,
$.escape_sequence,
$.string_interpolation,
)),
'"',
),
_multiline_string_literal: $ => seq(
'"""',
repeat(choice(
alias($._multiline_string_fragment, $.multiline_string_fragment),
$._escape_sequence,
$.string_interpolation,
)),
'"""',
),
// Workaround to https://github.com/tree-sitter/tree-sitter/issues/1156
// We give names to the token() constructs containing a regexp
// so as to obtain a node in the CST.
string_fragment: _ => token.immediate(prec(1, /[^"\\]+/)),
_multiline_string_fragment: _ => choice(
/[^"\\]+/,
seq(/"([^"\\]|\\")*/),
),
string_interpolation: $ => seq(
'\\{',
$.expression,
'}',
),
_escape_sequence: $ => choice(
prec(2, token.immediate(seq('\\', /[^bfnrts'\"\\]/))),
prec(1, $.escape_sequence),
),
escape_sequence: _ => token.immediate(seq(
'\\',
choice(
/[^xu0-7]/,
/[0-7]{1,3}/,
/x[0-9a-fA-F]{2}/,
/u[0-9a-fA-F]{4}/,
/u\{[0-9a-fA-F]+\}/,
))),
null_literal: _ => 'null',
// Expressions
expression: $ => choice(
$.assignment_expression,
$.binary_expression,
$.instanceof_expression,
$.lambda_expression,
$.ternary_expression,
$.update_expression,
$.primary_expression,
$.unary_expression,
$.cast_expression,
$.switch_expression,
),
cast_expression: $ => prec(PREC.CAST, choice(
seq(
'(',
field('type', $._type),
')',
field('value', $.expression),
),
seq(
'(',
sep1(field('type', $._type), '&'),
')',
field('value', choice($.primary_expression, $.lambda_expression)),
),
)),
assignment_expression: $ => prec.right(PREC.ASSIGN, seq(
field('left', choice(
$.identifier,
$._reserved_identifier,
$.field_access,
$.array_access,
)),
field('operator', choice('=', '+=', '-=', '*=', '/=', '&=', '|=', '^=', '%=', '<<=', '>>=', '>>>=')),
field('right', $.expression),
)),
binary_expression: $ => choice(
...[
['>', PREC.REL],
['<', PREC.REL],
['>=', PREC.REL],
['<=', PREC.REL],
['==', PREC.EQUALITY],
['!=', PREC.EQUALITY],
['&&', PREC.AND],
['||', PREC.OR],
['+', PREC.ADD],
['-', PREC.ADD],
['*', PREC.MULT],
['/', PREC.MULT],
['&', PREC.BIT_AND],
['|', PREC.BIT_OR],
['^', PREC.BIT_XOR],
['%', PREC.MULT],
['<<', PREC.SHIFT],
['>>', PREC.SHIFT],
['>>>', PREC.SHIFT],
].map(([operator, precedence]) =>
prec.left(precedence, seq(
field('left', $.expression),
// @ts-ignore
field('operator', operator),
field('right', $.expression),
)),
)),
instanceof_expression: $ => prec(PREC.REL, seq(
field('left', $.expression),
'instanceof',
optional('final'),
choice(
seq(
field('right', $._type),
optional(field('name', choice($.identifier, $._reserved_identifier))),
),
field('pattern', $.record_pattern),
),
)),
lambda_expression: $ => seq(
field('parameters', choice(
$.identifier, $.formal_parameters, $.inferred_parameters, $._reserved_identifier,
)),
'->',
field('body', choice($.expression, $.block)),
),
inferred_parameters: $ => seq(
'(',
commaSep1(choice($.identifier, $._reserved_identifier)),
')',
),
ternary_expression: $ => prec.right(PREC.TERNARY, seq(
field('condition', $.expression),
'?',
field('consequence', $.expression),
':',
field('alternative', $.expression),
)),
unary_expression: $ => choice(...[
['+', PREC.UNARY],
['-', PREC.UNARY],
['!', PREC.UNARY],
['~', PREC.UNARY],
].map(([operator, precedence]) =>
prec.left(precedence, seq(
// @ts-ignore
field('operator', operator),
field('operand', $.expression),
)),
)),
update_expression: $ => prec.left(PREC.UNARY, choice(
// Post (in|de)crement is evaluated before pre (in|de)crement
seq($.expression, '++'),
seq($.expression, '--'),
seq('++', $.expression),
seq('--', $.expression),
)),
primary_expression: $ => choice(
$._literal,
$.class_literal,
$.this,
$.identifier,
$._reserved_identifier,
$.parenthesized_expression,
$.object_creation_expression,
$.field_access,
$.array_access,
$.method_invocation,
$.method_reference,
$.array_creation_expression,
$.template_expression,
),
array_creation_expression: $ => prec.right(seq(
'new',
repeat($._annotation),
field('type', $._simple_type),
choice(
seq(
field('dimensions', repeat1($.dimensions_expr)),
field('dimensions', optional($.dimensions)),
),
seq(
field('dimensions', $.dimensions),
field('value', $.array_initializer),
),
),
)),
dimensions_expr: $ => seq(repeat($._annotation), '[', $.expression, ']'),
parenthesized_expression: $ => prec(PREC.PARENS, seq(
'(',
$.expression,
')',
)),
class_literal: $ => prec.dynamic(PREC.CLASS_LITERAL, seq($._unannotated_type, '.', 'class')),
object_creation_expression: $ => choice(
$._unqualified_object_creation_expression,
seq($.primary_expression, '.', $._unqualified_object_creation_expression),
),
_unqualified_object_creation_expression: $ => prec.right(seq(
'new',
choice(
seq(
repeat($._annotation),
field('type_arguments', $.type_arguments),
repeat($._annotation),
),
repeat($._annotation),
),
field('type', $._simple_type),
field('arguments', $.argument_list),
optional($.class_body),
)),
field_access: $ => seq(
field('object', choice($.primary_expression, $.super)),
optional(seq(
'.',
$.super,
)),
'.',
field('field', choice($.identifier, $._reserved_identifier, $.this)),
),
template_expression: $ => seq(
field('template_processor', $.primary_expression),
'.',
field('template_argument', $.string_literal),
),
array_access: $ => seq(
field('array', $.primary_expression),
'[',
field('index', $.expression),
']',
),
method_invocation: $ => seq(
choice(
field('name', choice($.identifier, $._reserved_identifier)),
seq(
field('object', choice($.primary_expression, $.super)),
'.',
optional(seq(
$.super,
'.',
)),
field('type_arguments', optional($.type_arguments)),
field('name', choice($.identifier, $._reserved_identifier)),
),
),
field('arguments', $.argument_list),
),
argument_list: $ => seq('(', commaSep($.expression), ')'),
method_reference: $ => seq(
choice($._type, $.primary_expression, $.super),
'::',
optional($.type_arguments),
choice('new', $.identifier),
),
type_arguments: $ => seq(
'<',
commaSep(choice($._type, $.wildcard)),
'>',
),
wildcard: $ => seq(
repeat($._annotation),
'?',
optional($._wildcard_bounds),
),
_wildcard_bounds: $ => choice(
seq('extends', $._type),
seq($.super, $._type),
),
dimensions: $ => prec.right(repeat1(
seq(repeat($._annotation), '[', ']'),
)),
switch_expression: $ => seq(
'switch',
field('condition', $.parenthesized_expression),
field('body', $.switch_block),
),
switch_block: $ => seq(
'{',
choice(
repeat($.switch_block_statement_group),
repeat($.switch_rule),
),
'}',
),
switch_block_statement_group: $ => prec.left(seq(
repeat1(seq($.switch_label, ':')),
repeat($.statement),
)),
switch_rule: $ => seq(
$.switch_label,
'->',
choice($.expression_statement, $.throw_statement, $.block),
),
switch_label: $ => choice(
seq('case',
choice(
$.pattern,
commaSep1($.expression),
),
optional($.guard),
),
'default',
),
pattern: $ => choice(
$.type_pattern,
$.record_pattern,
),
type_pattern: $ => seq($._unannotated_type, choice($.identifier, $._reserved_identifier)),
record_pattern: $ => seq(choice($.identifier, $._reserved_identifier, $.generic_type), $.record_pattern_body),
record_pattern_body: $ => seq('(', commaSep(choice($.record_pattern_component, $.record_pattern)), ')'),
record_pattern_component: $ => choice(
$.underscore_pattern,
seq(
$._unannotated_type,
choice($.identifier, $._reserved_identifier),
),
),
underscore_pattern: _ => '_',
guard: $ => seq('when', $.expression),
// Statements
statement: $ => choice(
$.declaration,
$.expression_statement,
$.labeled_statement,
$.if_statement,
$.while_statement,
$.for_statement,
$.enhanced_for_statement,
$.block,
';',
$.assert_statement,
$.do_statement,
$.break_statement,
$.continue_statement,
$.return_statement,
$.yield_statement,
$.switch_expression, // switch statements and expressions are identical
$.synchronized_statement,
$.local_variable_declaration,
$.throw_statement,
$.try_statement,
$.try_with_resources_statement,
),
block: $ => seq(
'{', repeat($.statement), '}',
),
expression_statement: $ => seq(
$.expression,
';',
),
labeled_statement: $ => seq(
$.identifier, ':', $.statement,
),
assert_statement: $ => choice(
seq('assert', $.expression, ';'),
seq('assert', $.expression, ':', $.expression, ';'),
),
do_statement: $ => seq(
'do',
field('body', $.statement),
'while',
field('condition', $.parenthesized_expression),
';',
),
break_statement: $ => seq('break', optional($.identifier), ';'),
continue_statement: $ => seq('continue', optional($.identifier), ';'),
return_statement: $ => seq(
'return',
optional($.expression),
';',
),
yield_statement: $ => seq(
'yield',
$.expression,
';',
),
synchronized_statement: $ => seq(
'synchronized',
$.parenthesized_expression,
field('body', $.block),
),
throw_statement: $ => seq('throw', $.expression, ';'),
try_statement: $ => seq(
'try',
field('body', $.block),
choice(
repeat1($.catch_clause),
seq(repeat($.catch_clause), $.finally_clause),
),
),
catch_clause: $ => seq(
'catch',
'(',
$.catch_formal_parameter,
')',
field('body', $.block),
),
catch_formal_parameter: $ => seq(
optional($.modifiers),
$.catch_type,
$._variable_declarator_id,
),
catch_type: $ => sep1($._unannotated_type, '|'),
finally_clause: $ => seq('finally', $.block),
try_with_resources_statement: $ => seq(
'try',
field('resources', $.resource_specification),
field('body', $.block),
repeat($.catch_clause),
optional($.finally_clause),
),
resource_specification: $ => seq(
'(', sep1($.resource, ';'), optional(';'), ')',
),
resource: $ => choice(
seq(
optional($.modifiers),
field('type', $._unannotated_type),
$._variable_declarator_id,
'=',
field('value', $.expression),
),
$.identifier,
$.field_access,
),
if_statement: $ => prec.right(seq(
'if',
field('condition', $.parenthesized_expression),
field('consequence', $.statement),
optional(seq('else', field('alternative', $.statement))),
)),
while_statement: $ => seq(
'while',
field('condition', $.parenthesized_expression),
field('body', $.statement),
),
for_statement: $ => seq(
'for', '(',
choice(
field('init', $.local_variable_declaration),
seq(
commaSep(field('init', $.expression)),
';',
),
),
field('condition', optional($.expression)), ';',
commaSep(field('update', $.expression)), ')',
field('body', $.statement),
),
enhanced_for_statement: $ => seq(
'for',
'(',
optional($.modifiers),
field('type', $._unannotated_type),
$._variable_declarator_id,
':',
field('value', $.expression),
')',
field('body', $.statement),
),
// Annotations
_annotation: $ => choice(
$.marker_annotation,
$.annotation,
),
marker_annotation: $ => seq(
'@',
field('name', $._name),
),
annotation: $ => seq(
'@',
field('name', $._name),
field('arguments', $.annotation_argument_list),
),
annotation_argument_list: $ => seq(
'(',
choice(
$._element_value,
commaSep($.element_value_pair),
),
')',
),
element_value_pair: $ => seq(
field('key', $.identifier),
'=',
field('value', $._element_value),
),
_element_value: $ => prec(PREC.ELEMENT_VAL, choice(
$.expression,
$.element_value_array_initializer,
$._annotation,
)),
element_value_array_initializer: $ => seq(
'{',
commaSep($._element_value),
optional(','),
'}',
),
// Declarations
declaration: $ => prec(PREC.DECL, choice(
$.module_declaration,
$.package_declaration,
$.import_declaration,
$.class_declaration,
$.record_declaration,
$.interface_declaration,
$.annotation_type_declaration,
$.enum_declaration,
)),
module_declaration: $ => seq(
repeat($._annotation),
optional('open'),
'module',
field('name', $._name),
field('body', $.module_body),
),
module_body: $ => seq(
'{',
repeat($.module_directive),
'}',
),
module_directive: $ => choice(
$.requires_module_directive,
$.exports_module_directive,
$.opens_module_directive,
$.uses_module_directive,
$.provides_module_directive,
),
requires_module_directive: $ => seq(
'requires',
repeat(field('modifiers', $.requires_modifier)),
field('module', $._name),
';',
),
requires_modifier: _ => choice(
'transitive',
'static',
),
exports_module_directive: $ => seq(
'exports',
field('package', $._name),
optional(seq(
'to',
field('modules', $._name),
repeat(seq(',', field('modules', $._name))),
)),
';',
),
opens_module_directive: $ => seq(
'opens',
field('package', $._name),
optional(seq(
'to',
field('modules', $._name),
repeat(seq(',', field('modules', $._name))),
)),
';',
),
uses_module_directive: $ => seq(
'uses',
field('type', $._name),
';',
),
provides_module_directive: $ => seq(
'provides',
field('provided', $._name),
'with',
$._name,
repeat(seq(',', (field('provider', $._name)))),
';',
),
package_declaration: $ => seq(
repeat($._annotation),
'package',
$._name,
';',
),
import_declaration: $ => seq(
'import',
optional('static'),
$._name,
optional(seq('.', $.asterisk)),
';',
),
asterisk: _ => '*',
enum_declaration: $ => seq(
optional($.modifiers),
'enum',
field('name', $.identifier),
field('interfaces', optional($.super_interfaces)),
field('body', $.enum_body),
),
enum_body: $ => seq(
'{',
commaSep($.enum_constant),
optional(','),
optional($.enum_body_declarations),
'}',
),
enum_body_declarations: $ => seq(
';',
repeat($._class_body_declaration),
),
enum_constant: $ => (seq(
optional($.modifiers),
field('name', $.identifier),
field('arguments', optional($.argument_list)),
field('body', optional($.class_body)),
)),
class_declaration: $ => seq(
optional($.modifiers),
'class',
field('name', $.identifier),
optional(field('type_parameters', $.type_parameters)),
optional(field('superclass', $.superclass)),
optional(field('interfaces', $.super_interfaces)),
optional(field('permits', $.permits)),
field('body', $.class_body),
),
modifiers: $ => repeat1(choice(
$._annotation,
'public',
'protected',
'private',
'abstract',
'static',
'final',
'strictfp',
'default',
'synchronized',
'native',
'transient',
'volatile',
'sealed',
'non-sealed',
)),
type_parameters: $ => prec(PREC.GENERIC, seq(
'<', commaSep1($.type_parameter), '>',
)),
type_parameter: $ => seq(
repeat($._annotation),
alias($.identifier, $.type_identifier),
optional($.type_bound),
),
type_bound: $ => seq('extends', $._type, repeat(seq('&', $._type))),
superclass: $ => seq(
'extends',
$._type,
),
super_interfaces: $ => seq(
'implements',
$.type_list,
),
type_list: $ => seq(
$._type,
repeat(seq(',', $._type)),
),
permits: $ => seq(
'permits',
$.type_list,
),
class_body: $ => seq(
'{',
repeat($._class_body_declaration),
'}',
),
_class_body_declaration: $ => choice(
$.field_declaration,
$.record_declaration,
$.method_declaration,
$.compact_constructor_declaration, // For records.
$.class_declaration,
$.interface_declaration,
$.annotation_type_declaration,
$.enum_declaration,
$.block,
$.static_initializer,
$.constructor_declaration,
';',
),
static_initializer: $ => seq(
'static',
$.block,
),
constructor_declaration: $ => seq(
optional($.modifiers),
$._constructor_declarator,
optional($.throws),
field('body', $.constructor_body),
),
_constructor_declarator: $ => seq(
field('type_parameters', optional($.type_parameters)),
field('name', $.identifier),
field('parameters', $.formal_parameters),
),
constructor_body: $ => seq(
'{',
optional($.explicit_constructor_invocation),
repeat($.statement),
'}',
),
explicit_constructor_invocation: $ => seq(
choice(
seq(
field('type_arguments', optional($.type_arguments)),
field('constructor', choice($.this, $.super)),
),
seq(
field('object', choice($.primary_expression)),
'.',
field('type_arguments', optional($.type_arguments)),