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grammar.js
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grammar.js
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// Precedence is used by the parser to determine which rule to apply when there are two rules that can be applied.
// We use the PREC dict to globally define rule pprecidence
const PREC = {
COMMENT: 1,
STRING: 2,
COMMA: -1,
OBJECT: -1,
USER_TYPE: 1,
DECLARATION: 1,
ASSIGN: 0,
TERNARY: 1,
OR: 2,
AND: 3,
REL: 4,
PLUS: 5,
TIMES: 6,
EXP: 7,
TYPEOF: 8,
DELETE: 8,
VOID: 8,
NOT: 9,
NEG: 10,
INC: 11,
CALL: 12,
NEW: 13,
MEMBER: 14
}
// The following is the core grammar for Solidity. It accepts Solidity smart contracts between the versions 0.4.x and 0.7.x.
module.exports = grammar({
name: 'solidity',
// Extras is an array of tokens that is allowed anywhere in the document.
extras: $ => [
// Allow comments to be placed anywhere in the file
$.comment,
// Allow characters such as whitespaces to be placed anywhere in the file
/[\s\uFEFF\u2060\u200B\u00A0]/
],
// The word token allows tree-sitter to appropriately handle scenario's where an identifier includes a keyword.
// Documentation: https://tree-sitter.github.io/tree-sitter/creating-parsers#keywords
word: $ => $.identifier,
conflicts: $ => [
[$._primary_expression, $.type_name],
[$._parameter_list, $.fallback_receive_definition],
[$._primary_expression, $.type_cast_expression],
[$._yul_expression, $.yul_path],
[$._yul_expression, $.yul_assignment],
[$.pragma_value, $._solidity]
],
rules: {
// -- [ Program ] --
source_file: $ => seq(
repeat($._source_unit),
),
// -- [ Source Element ] --
_source_unit: $ => choice(
$._directive,
$._declaration,
),
// -- [ Directives ] --
_directive: $ => choice(
$.pragma_directive,
$.import_directive,
),
// Pragma
pragma_directive: $ => seq(
"pragma",
choice($.solidity_pragma_token, $.any_pragma_token),
$._semicolon,
),
solidity_pragma_token: $ => prec(10, seq(
$._solidity,
repeat(field("version_constraint", $._pragma_version_constraint)),
)),
any_pragma_token: $ => seq(
$.identifier,
$.pragma_value,
),
_solidity: $ => prec(1, "solidity"),
pragma_value: $ => prec(0, /[^;]+/),
_pragma_version_constraint: $ => seq(
optional($.solidity_version_comparison_operator),
$.solidity_version,
),
solidity_version: $ => /\d+(.\d+(.\d+)?)?/,
solidity_version_comparison_operator: $ => choice("<=", "<", "^", ">", ">=", "~", "="),
// Import
import_directive: $ => seq(
'import',
choice(
$._source_import,
seq($._import_clause, $._from_clause)
),
$._semicolon,
),
_source_import: $ => seq(
field('source', $.string),
optional(seq("as", $.identifier))
),
_import_clause: $ => choice(
$._single_import,
$._multiple_import,
),
_from_clause: $ => seq(
"from", field('source', $.string)
),
_single_import: $ => seq(
"*",
optional(
seq(
"as",
field("import_alias", $.identifier)
)
)
),
_multiple_import: $ => seq(
'{',
commaSep($._import_declaration),
'}'
),
_import_declaration: $ => seq(
field("import_origin", $.identifier),
optional(
seq(
"as",
field("import_alias", $.identifier)
)
)
),
// -- [ Declarations ] --
_declaration: $ => choice(
$.contract_declaration,
$.interface_declaration,
$.library_declaration,
$.struct_declaration,
$.enum_declaration,
$.function_definition,
$.constant_variable_declaration,
),
constant_variable_declaration: $ => seq(
field("type", $.type_name),
$.constant,
field("name", $.identifier),
'=',
field("value", $._expression),
$._semicolon
),
// Contract Declarations
contract_declaration: $ => seq(
optional('abstract'),
'contract',
field("name", $.identifier),
optional($._class_heritage),
field('body', $.contract_body),
),
interface_declaration: $ => seq(
'interface',
field("name", $.identifier),
optional($._class_heritage),
field('body', $.contract_body),
),
library_declaration: $ => seq(
'library',
field("name", $.identifier),
field('body', $.contract_body),
),
_class_heritage: $ => seq(
"is",
commaSep1($.inheritance_specifier)
),
inheritance_specifier: $ => seq(
field("ancestor", $._user_defined_type),
optional(field("ancestor_arguments", $._call_arguments)),
),
contract_body: $ => seq(
"{",
repeat($._contract_member),
"}",
),
_contract_member: $ => choice(
$.function_definition,
$.modifier_definition,
$.state_variable_declaration,
$.struct_declaration,
$.enum_declaration,
$.event_definition,
$.using_directive,
$.constructor_definition,
$.fallback_receive_definition,
),
struct_declaration: $ => seq(
'struct',
field("struct_name", $.identifier),
'{',
repeat1($.struct_member),
'}',
),
struct_member: $ => seq(
field("type", $.type_name),
field("name", $.identifier),
$._semicolon
),
enum_declaration: $ => seq(
'enum',
field("enum_type_name", $.identifier),
'{',
commaSep(alias($.identifier, $.enum_value)),
'}',
),
event_definition: $ => seq(
'event', field('name', $.identifier), $._event_parameter_list , optional('anonymous'), $._semicolon
),
_event_parameter_list: $ => seq(
"(",
commaSep($.event_paramater),
")"
),
event_paramater: $ => seq(
field("type", $.type_name),
optional("indexed"),
optional(field("name", $.identifier)),
),
using_directive: $ => seq(
'using',
alias($._user_defined_type, $.type_alias),
'for',
field("source", choice($.any_source_type, $.type_name)),
$._semicolon
),
any_source_type: $ => '*',
// -- [ Statements ] --
_statement: $ => choice(
$.block_statement,
$.expression_statement,
$.variable_declaration_statement,
$.if_statement,
$.for_statement,
$.while_statement,
$.do_while_statement,
$.continue_statement,
$.break_statement,
$.try_statement,
$.return_statement,
$.emit_statement,
$.assembly_statement
),
assembly_statement: $ => seq(
'assembly',
optional('"evmasm"'),
"{",
repeat($._yul_statement),
"}"
),
// -- [ Yul ] --
_yul_statement: $ => choice(
$.yul_block,
$.yul_variable_declaration,
$.yul_assignment,
$.yul_function_call,
$.yul_if_statement,
$.yul_for_statement,
$.yul_switch_statement,
$.yul_leave,
$.yul_break,
$.yul_continue,
$.yul_function_definition
),
yul_leave: $ => "leave",
yul_break: $ => "break",
yul_continue: $ => "continue",
yul_identifier: $ => /[a-zA-Z$_]+/,
_yul_expression: $ => choice($.yul_path, $.yul_function_call, $._yul_literal),
yul_path: $ => prec.left(dotSep1($.yul_identifier)),
// -- Yul Literals --
_yul_literal: $ => choice(
$.yul_decimal_number,
$.yul_string_literal,
$.yul_hex_number,
$.yul_boolean,
),
yul_decimal_number: $ => /0|([1-9][0-9]*)/,
yul_string_literal: $ => $.string,
yul_hex_number: $ => /0x[0-9A-Fa-f]*/,
yul_boolean: $ => choice('true', 'false'),
// -- Yul Statements --
yul_block: $ => seq('{', repeat($._yul_statement), '}'),
yul_variable_declaration: $ => prec.left(PREC.DECLARATION, choice(
seq('let', field("left", $.yul_identifier), optional(seq(':=', field("right", $._yul_expression)))),
seq(
'let', field("left", choice(
commaSep1($.yul_identifier),
seq('(', commaSep1($.yul_identifier), ')')
)),
optional(seq(':=', field("right", $.yul_function_call)))),
)),
yul_assignment: $ => prec.left(PREC.ASSIGN, choice(
seq($.yul_path, ':=', $._yul_expression),
seq(commaSep1($.yul_path), optional(seq(':=', $.yul_function_call))),
)),
yul_function_call: $ => seq(
field("function", choice($.yul_identifier, $.yul_evm_builtin)), '(', commaSep($._yul_expression), ')'
),
yul_if_statement: $ => seq('if', $._yul_expression, $.yul_block),
yul_for_statement: $ => seq('for', $.yul_block, $._yul_expression, $.yul_block, $.yul_block),
yul_switch_statement: $ => seq(
'switch', $._yul_expression,
choice(
seq('default', $.yul_block),
seq(
repeat1(seq('case', $._yul_literal, $.yul_block)),
optional(seq('default', $.yul_block)),
)
),
),
yul_function_definition: $ => seq(
'function', $.yul_identifier, '(', commaSep($.yul_identifier), ')',
optional(seq('->', commaSep1($.yul_identifier))),
$.yul_block
),
yul_evm_builtin: $ => prec(1, choice(
'stop',
'add',
'sub',
'mul',
'div',
'sdiv',
'mod',
'smod',
'exp',
'not',
'lt',
'gt',
'slt',
'sgt',
'eq',
'iszero',
'and',
'or',
'xor',
'byte',
'shl',
'shr',
'sar',
'addmod',
'mulmod',
'signextend',
'keccak256',
'pop',
'mload',
'mstore',
'mstore8',
'sload',
'sstore',
'msize',
'gas',
'address',
'balance',
'selfbalance',
'caller',
'callvalue',
'calldataload',
'calldatasize',
'calldatacopy',
'extcodesize',
'extcodecopy',
'returndatasize',
'returndatacopy',
'extcodehash',
'create',
'create2',
'call',
'callcode',
'delegatecall',
'staticcall',
'return',
'revert',
'selfdestruct',
'invalid',
'log0',
'log1',
'log2',
'log3',
'log4',
'chainid',
'origin',
'gasprice',
'blockhash',
'coinbase',
'timestamp',
'number',
'difficulty',
'gaslimit',
)),
// -- [ Statements ] --
block_statement: $ => seq('{', repeat($._statement), "}"),
variable_declaration_statement: $ => prec(3,seq(
choice(
seq($.variable_declaration, optional(seq('=', $._expression))),
seq($.variable_declaration_tuple, '=', $._expression),
),
$._semicolon
)),
// var_variable_decartion: $ => prec.left(seq(
// 'var',
// choice(
// $.identifier,
// seq(
// '(',
// optional($.identifier),
// repeat(
// seq(
// ',',
// optional($.identifier),
// )
// ),
// ')')
// ),
// '=',
// $._expression,
// $._semicolon,
// )),
variable_declaration: $ => seq(
$.type_name,
optional(choice('memory', 'storage', 'calldata')),
field('name', $.identifier)
),
variable_declaration_tuple: $ => prec(3, choice(
seq(
'(',
commaSep($.variable_declaration),
')'
),
seq('var',
'(',
optional($.identifier),
repeat(
seq(
',',
optional($.identifier),
)
),
')'
)
)),
expression_statement: $ => seq($._expression, $._semicolon),
if_statement: $ => prec.left(seq(
'if', '(',$._expression, ')', $._statement, optional(seq('else', $._statement)),
)),
for_statement: $ => seq(
'for', '(',
choice($.variable_declaration_statement, $.expression_statement, $._semicolon),
choice($.expression_statement, $._semicolon),
optional($._expression),
')', $._statement,
),
while_statement: $ => seq(
'while', '(',$._expression, ')', $._statement,
),
do_while_statement: $ => seq(
'do', $._statement, 'while', '(',$._expression, ')',
),
continue_statement: $ => seq('continue', $._semicolon),
break_statement: $ => seq('break', $._semicolon),
try_statement: $ => seq(
'try', $._expression, optional(seq('returns', $._parameter_list)), $.block_statement, repeat1($.catch_clause),
),
catch_clause: $ => seq(
'catch', optional(seq(optional($.identifier), $._parameter_list)), $.block_statement,
),
return_statement: $ => seq(
'return', optional($._expression), $._semicolon
),
emit_statement: $ => seq(
'emit', $._expression, $._call_arguments, $._semicolon
),
// -- [ Definitions ] --
// Definitions
state_variable_declaration: $ => seq(
field("type", $.type_name),
repeat(choice(
field('visibility', $.visibility), // FIXME: this also allows external
$.constant,
$.override_specifier,
$.immutable,
)),
field("name", $.identifier),
optional(seq(
'=', field("value", $._expression)
)),
$._semicolon
),
constant: $ => "constant",
visibility: $ => choice(
'public',
'internal',
'private',
'external',
),
state_mutability: $ => choice(
'pure',
'view',
'payable'
),
immutable: $ => 'immutable',
_override: $ => 'override',
override_specifier: $ => seq(
'override',
optional(seq(
'(',
commaSep1($._user_defined_type),
')',
))
),
modifier_definition: $ => seq(
"modifier",
field("name", $.identifier),
optional($._parameter_list),
repeat(choice(
$.virtual,
$.override_specifier,
)),
choice($._semicolon, field("body", $.function_body)),
),
constructor_definition: $ => seq(
'constructor',
$._parameter_list,
repeat(choice(
$.modifier_invocation,
'payable',
choice('internal', 'public'),
)),
field('body', $.function_body),
),
fallback_receive_definition: $ => seq(
choice(seq(
optional("function"),
choice('fallback', 'receive'),
),
"function"
),
'(', ')',
// FIXME: We use repeat to allow for unorderedness. However, this means that the parser
// accepts more than just the solidity language. The same problem exists for other definition rules.
repeat(choice(
$.visibility,
$.modifier_invocation,
$.state_mutability,
$.virtual,
$.override_specifier,
)),
choice($._semicolon, field('body', $.function_body))
),
function_definition: $ => seq(
"function",
field("function_name", $.identifier),
$._parameter_list,
repeat(choice(
$.modifier_invocation,
$.visibility,
$.state_mutability,
$.virtual,
$.override_specifier,
)),
field("return_type", optional($.return_type_definition)),
choice($._semicolon, field('body', $.function_body))
),
return_type_definition: $ => seq(
'returns',
$._parameter_list,
),
virtual: $ => "virtual",
modifier_invocation: $ => seq($.identifier, optional($._call_arguments)),
_call_arguments: $ => prec(4,
seq(
'(',
commaSep(choice(
$._expression,
seq("{", commaSep(seq($.identifier, ":", $._expression)), "}"),
)),
')'
),
),
function_body: $ => seq(
"{",
// TODO: make sure this is correct
repeat($._statement),
"}",
),
// Expressions
_expression: $ => choice(
$.binary_expression,
$.unary_expression,
$.update_expression,
$.call_expression,
// TODO: $.function_call_options_expression,
$.payable_conversion_expression,
$.meta_type_expression,
$._primary_expression,
$.struct_expression,
$.ternary_expression,
$.type_cast_expression,
),
// TODO: make primary expression anonymous
_primary_expression: $ => choice(
$.parenthesized_expression,
$.member_expression,
$.array_access,
$.slice_access,
$.primitive_type,
$.assignment_expression,
$.augmented_assignment_expression,
$._user_defined_type,
$.tuple_expression,
$.inline_array_expression,
$.identifier,
$._literal,
$.new_expression,
),
// TODO: back this up with official documentation
type_cast_expression: $ => prec.left(seq($.primitive_type, '(', $._expression,')')),
ternary_expression: $ => prec.left(seq($._expression, "?", $._expression, ':', $._expression)),
// TODO: make sure call arguments are part of solidity
new_expression: $ => prec.left(seq('new', $.type_name, optional($._call_arguments))),
tuple_expression: $ => prec(1, seq(
'(',
optional($._expression),
repeat(
seq(
',',
optional($._expression),
)
),
')'
)),
inline_array_expression: $ => seq(
'[',
commaSep($._expression),
']'
),
binary_expression: $ => choice(
...[
['&&', PREC.AND],
['||', PREC.OR],
['>>', PREC.TIMES],
['>>>', PREC.TIMES],
['<<', PREC.TIMES],
['&', PREC.AND],
['^', PREC.OR],
['|', PREC.OR],
['+', PREC.PLUS],
['-', PREC.PLUS],
['*', PREC.TIMES],
['/', PREC.TIMES],
['%', PREC.TIMES],
['**', PREC.EXP],
['<', PREC.REL],
['<=', PREC.REL],
['==', PREC.REL],
['!=', PREC.REL],
['!==', PREC.REL],
['>=', PREC.REL],
['>', PREC.REL],
].map(([operator, precedence]) =>
prec.left(precedence, seq(
field('left', $._expression),
field('operator', operator),
field('right', $._expression)
))
)
),
unary_expression: $ => choice(...[
['!', PREC.NOT],
['~', PREC.NOT],
['-', PREC.NEG],
['+', PREC.NEG],
['delete', PREC.DELETE],
].map(([operator, precedence]) =>
prec.left(precedence, seq(
field('operator', operator),
field('argument', $._expression)
))
)),
update_expression: $ => prec.left(PREC.INC, choice(
seq(
field('argument', $._expression),
field('operator', choice('++', '--'))
),
seq(
field('operator', choice('++', '--')),
field('argument', $._expression)
),
)),
member_expression: $ => prec(PREC.MEMBER, seq(
field('object', choice(
$._expression,
$.identifier,
)),
'.',
field('property', alias($.identifier, $.property_identifier))
)),
array_access: $ => prec.right(14,seq(
field('base', $._expression),
'[',
field('index', $._expression),
']'
)),
slice_access: $ => prec(PREC.MEMBER, seq(
field('base', $._expression),
'[',
field('from', $._expression),
':',
field('to', $._expression),
']'
)),
struct_expression: $ => seq(
$._expression,
"{",
commaSep(seq(
$.identifier,
":",
$._expression,
)),
"}"
),
_lhs_expression: $ => choice(
$.member_expression,
$.array_access,
$.identifier,
$.tuple_expression,
// $._destructuring_pattern
),
parenthesized_expression: $ => prec(2, seq('(', $._expression, ')')),
assignment_expression: $ => prec.right(PREC.ASSIGN, seq(
field('left', choice($.parenthesized_expression, $._lhs_expression)),
'=',
field('right', $._expression)
)),
augmented_assignment_expression: $ => prec.right(PREC.ASSIGN, seq(
field('left', $._lhs_expression),
choice('+=', '-=', '*=', '/=', '%=', '^=', '&=', '|=', '>>=', '>>>=',
'<<=',),
field('right', $._expression)
)),
call_expression: $ => seq($._expression, $._call_arguments),
payable_conversion_expression: $ => seq('payable', $._call_arguments),
meta_type_expression: $ => seq('type', '(', $.type_name, ')'),
type_name: $ => prec(0, choice(
$.primitive_type,
$._user_defined_type,
$._mapping,
$._array_type,
$._function_type,
)),
_array_type: $ => prec(1, seq($.type_name, '[', optional($._expression), ']')),
_function_type: $ => prec.right(seq(
'function', $._parameter_list, optional($._return_parameters),
)),
_parameter_list: $ => seq(
'(', commaSep($.parameter), ')'
),
_return_parameters: $ => seq(
'(', commaSep1($._nameless_parameter), ')'
),
_nameless_parameter: $ => seq(
$.type_name,
optional($._storage_location),
),
parameter: $ => seq(
field("type", $.type_name),
optional(field("storage_location", $._storage_location)),
optional(field("name", $.identifier)),
),
_storage_location: $ => choice(
'memory',
'storage',
'calldata'
),
// TODO: make visible type
_user_defined_type: $ => prec.left(PREC. USER_TYPE, seq(
$.identifier,
repeat(seq(
'.',
$.identifier,
))
)),
_mapping: $ => seq(
'mapping', '(', $._mapping_key, '=>', $.type_name, ')',
),
_mapping_key: $ => choice(
$.primitive_type,
$._user_defined_type
),
primitive_type: $ => prec.left(choice(
seq('address', optional('payable')),
'bool',
'string',
'var',
$._int,
$._uint,
$._bytes,
$._fixed,
$._ufixed,
)),
_int: $ => choice (
'int', 'int8', 'int16', 'int24', 'int32', 'int40', 'int48', 'int56', 'int64', 'int72', 'int80', 'int88', 'int96', 'int104', 'int112', 'int120', 'int128', 'int136', 'int144', 'int152', 'int160', 'int168', 'int176', 'int184', 'int192', 'int200', 'int208', 'int216', 'int224', 'int232', 'int240', 'int248', 'int256'
),
_uint: $ => choice (
'uint', 'uint8', 'uint16', 'uint24', 'uint32', 'uint40', 'uint48', 'uint56', 'uint64', 'uint72', 'uint80', 'uint88', 'uint96', 'uint104', 'uint112', 'uint120', 'uint128', 'uint136', 'uint144', 'uint152', 'uint160', 'uint168', 'uint176', 'uint184', 'uint192', 'uint200', 'uint208', 'uint216', 'uint224', 'uint232', 'uint240', 'uint248', 'uint256'
),
_bytes: $ => choice (
'byte', 'bytes', 'bytes1', 'bytes2', 'bytes3', 'bytes4', 'bytes5', 'bytes6', 'bytes7', 'bytes8', 'bytes9', 'bytes10', 'bytes11', 'bytes12', 'bytes13', 'bytes14', 'bytes15', 'bytes16', 'bytes17', 'bytes18', 'bytes19', 'bytes20', 'bytes21', 'bytes22', 'bytes23', 'bytes24', 'bytes25', 'bytes26', 'bytes27', 'bytes28', 'bytes29', 'bytes30', 'bytes31', 'bytes32'
),
_fixed: $ => choice (
'fixed',
/fixed([0-9]+)x([0-9]+)/
),
_ufixed: $ => choice (
'ufixed',
/ufixed([0-9]+)x([0-9]+)/
),
_semicolon: $ => ';',
identifier: $ => /[a-zA-Z$_][a-zA-Z0-9$_]*/,
number: $ => /\d+/,
_literal: $ => choice(
$.string_literal,
$.number_literal,
$.boolean_literal,
$.hex_string_literal,
$.unicode_string_literal,
),
string_literal: $ => prec.left(repeat1($.string)),
number_literal: $ => seq(choice($._decimal_number, $._hex_number), optional($.number_unit)),
_decimal_number: $ => choice(
/\d+(\.\d+)?([eE](-)?\d+)?/,
/\.\d+([eE](-)?\d+)?/,
),
_hex_number: $ => seq(/0[xX]/, optional(optionalDashSeparation($._hex_digit))),
_hex_digit: $ => /([a-fA-F0-9][a-fA-F0-9])/,
number_unit: $ => choice(
'wei','szabo', 'finney', 'gwei', 'ether', 'seconds', 'minutes', 'hours', 'days', 'weeks', 'years'
),
true: $ => "true",
false: $ => "false",
boolean_literal: $ => choice($.true, $.false),
hex_string_literal: $ => prec.left(repeat1(seq(
'hex',
choice(
seq('"', optional(optionalDashSeparation($._hex_digit)), '"'),
seq("'", optional(optionalDashSeparation($._hex_digit)), "'"),
)))),
_escape_sequence: $ => seq('\\', choice(
// TODO: it might be allowed to escape non special characters
/"'\\bfnrtv\n\r/,
/u([a-fA-F0-9]{4})/,
/x([a-fA-F0-9]{2})/,
)),
_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]+}/
)
)),
_single_quoted_unicode_char: $ => choice(/[^'\r\n\\]/, $._escape_sequence),
_double_quoted_unicode_char: $ => choice(/[^"\r\n\\]/, $._escape_sequence),
unicode_string_literal: $ => prec.left(repeat1(seq(
'unicode',
choice(
seq('"', repeat($._double_quoted_unicode_char), '"'),
seq("'", repeat($._single_quoted_unicode_char), "'"),
)))),
string: $ => choice(
seq(
'"',
repeat(choice(
$._string_immediate_elt_inside_double_quote,
$._escape_sequence
)),
'"'
),
seq(
"'",
repeat(choice(
$._string_immediate_elt_inside_quote,
$._escape_sequence
)),
"'"
)