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const
PREC
=
{
// this resolves a conflict between the usage of ':' in a lambda vs in a
// typed parameter. In the case of a lambda, we don't allow typed parameters.
lambda
:
-
2
,
typed_parameter
:
-
1
,
conditional
:
-
1
,
parenthesized_expression
:
1
,
parenthesized_list_splat
:
1
,
not
:
12
,
compare
:
2
,
or
:
10
,
and
:
11
,
bitwise_or
:
13
,
bitwise_and
:
14
,
xor
:
15
,
shift
:
16
,
plus
:
17
,
times
:
18
,
unary
:
19
,
power
:
20
,
call
:
21
,
}
module
.
exports
=
grammar
(
{
name
:
'python'
,
extras
:
$
=>
[
$
.
comment
,
/
[
\s
\f
\uFEFF
\u2060
\u200B
]
|
\\
\r
?
\n
/
]
,
conflicts
:
$
=>
[
[
$
.
primary_expression
,
$
.
pattern
]
,
[
$
.
primary_expression
,
$
.
list_splat_pattern
]
,
[
$
.
tuple
,
$
.
tuple_pattern
]
,
[
$
.
list
,
$
.
list_pattern
]
,
[
$
.
with_item
,
$
.
_collection_elements
]
,
[
$
.
match_statement
,
$
.
primary_expression
]
,
]
,
supertypes
:
$
=>
[
$
.
_simple_statement
,
$
.
_compound_statement
,
$
.
expression
,
$
.
primary_expression
,
$
.
pattern
,
$
.
parameter
,
]
,
externals
:
$
=>
[
$
.
_newline
,
$
.
_indent
,
$
.
_dedent
,
$
.
_string_start
,
$
.
_string_content
,
$
.
_string_end
,
$
.
_template_string_start
,
]
,
inline
:
$
=>
[
$
.
_simple_statement
,
$
.
_compound_statement
,
$
.
_suite
,
$
.
_expressions
,
$
.
_left_hand_side
,
$
.
keyword_identifier
,
]
,
word
:
$
=>
$
.
identifier
,
rules
:
{
module
:
$
=>
repeat
(
$
.
_statement
)
,
_statement
:
$
=>
choice
(
$
.
_simple_statements
,
$
.
_compound_statement
)
,
// Simple statements
_simple_statements
:
$
=>
seq
(
$
.
_simple_statement
,
optional
(
repeat
(
seq
(
$
.
_semicolon
,
$
.
_simple_statement
)
)
)
,
optional
(
$
.
_semicolon
)
,
$
.
_newline
)
,
_simple_statement
:
$
=>
choice
(
$
.
future_import_statement
,
$
.
import_statement
,
$
.
import_from_statement
,
$
.
print_statement
,
$
.
assert_statement
,
$
.
expression_statement
,
$
.
return_statement
,
$
.
delete_statement
,
$
.
raise_statement
,
$
.
pass_statement
,
$
.
break_statement
,
$
.
continue_statement
,
$
.
global_statement
,
$
.
nonlocal_statement
,
$
.
exec_statement
,
$
.
type_alias_statement
,
)
,
import_statement
:
$
=>
seq
(
'import'
,
$
.
_import_list
)
,
import_prefix
:
$
=>
repeat1
(
'.'
)
,
relative_import
:
$
=>
seq
(
$
.
import_prefix
,
optional
(
field
(
'name'
,
$
.
dotted_name
)
)
)
,
future_import_statement
:
$
=>
seq
(
'from'
,
'__future__'
,
'import'
,
choice
(
$
.
_import_list
,
seq
(
'('
,
$
.
_import_list
,
')'
)
,
)
)
,
import_from_statement
:
$
=>
seq
(
'from'
,
field
(
'module_name'
,
choice
(
$
.
relative_import
,
$
.
dotted_name
)
)
,
'import'
,
choice
(
$
.
wildcard_import
,
$
.
_import_list
,
seq
(
'('
,
$
.
_import_list
,
')'
)
)
)
,
_import_list
:
$
=>
seq
(
commaSep1
(
field
(
'name'
,
choice
(
$
.
dotted_name
,
$
.
aliased_import
)
)
)
,
optional
(
','
)
)
,
aliased_import
:
$
=>
seq
(
field
(
'name'
,
$
.
dotted_name
)
,
'as'
,
field
(
'alias'
,
$
.
identifier
)
)
,
wildcard_import
:
$
=>
'*'
,
print_statement
:
$
=>
choice
(
prec
(
1
,
seq
(
'print'
,
$
.
chevron
,
repeat
(
seq
(
','
,
field
(
'argument'
,
$
.
expression
)
)
)
,
optional
(
','
)
)
)
,
prec
(
-
10
,
seq
(
'print'
,
commaSep1
(
field
(
'argument'
,
$
.
expression
)
)
,
optional
(
','
)
)
)
)
,
chevron
:
$
=>
seq
(
'>>'
,
$
.
expression
)
,
assert_statement
:
$
=>
seq
(
'assert'
,
commaSep1
(
$
.
expression
)
)
,
expression_statement
:
$
=>
choice
(
$
.
expression
,
$
.
expression_list
,
$
.
assignment
,
$
.
augmented_assignment
,
$
.
yield
)
,
named_expression
:
$
=>
seq
(
field
(
'name'
,
choice
(
$
.
identifier
,
$
.
keyword_identifier
)
)
,
':='
,
field
(
'value'
,
$
.
expression
)
)
,
return_statement
:
$
=>
seq
(
'return'
,
optional
(
$
.
_expressions
)
)
,
delete_statement
:
$
=>
seq
(
'del'
,
field
(
'target'
,
$
.
_expressions
)
)
,
_expressions
:
$
=>
choice
(
$
.
expression
,
$
.
expression_list
)
,
raise_statement
:
$
=>
seq
(
'raise'
,
optional
(
$
.
_expressions
)
,
optional
(
seq
(
'from'
,
field
(
'cause'
,
$
.
expression
)
)
)
)
,
pass_statement
:
$
=>
prec
.
left
(
'pass'
)
,
break_statement
:
$
=>
prec
.
left
(
'break'
)
,
continue_statement
:
$
=>
prec
.
left
(
'continue'
)
,
// Compound statements
_compound_statement
:
$
=>
choice
(
$
.
if_statement
,
$
.
for_statement
,
$
.
while_statement
,
$
.
try_statement
,
$
.
with_statement
,
$
.
match_statement
,
$
.
function_definition
,
$
.
class_definition
,
$
.
decorated_definition
)
,
if_statement
:
$
=>
seq
(
'if'
,
field
(
'condition'
,
$
.
expression
)
,
':'
,
field
(
'consequence'
,
$
.
_suite
)
,
repeat
(
field
(
'alternative'
,
$
.
elif_clause
)
)
,
optional
(
field
(
'alternative'
,
$
.
else_clause
)
)
)
,
elif_clause
:
$
=>
seq
(
'elif'
,
field
(
'condition'
,
$
.
expression
)
,
':'
,
field
(
'consequence'
,
$
.
_suite
)
)
,
else_clause
:
$
=>
seq
(
'else'
,
':'
,
field
(
'body'
,
$
.
_suite
)
)
,
for_statement
:
$
=>
seq
(
optional
(
'async'
)
,
'for'
,
field
(
'left'
,
$
.
_left_hand_side
)
,
'in'
,
field
(
'right'
,
$
.
_expressions
)
,
':'
,
field
(
'body'
,
$
.
_suite
)
,
field
(
'alternative'
,
optional
(
$
.
else_clause
)
)
)
,
while_statement
:
$
=>
seq
(
'while'
,
field
(
'condition'
,
$
.
expression
)
,
':'
,
field
(
'body'
,
$
.
_suite
)
,
optional
(
field
(
'alternative'
,
$
.
else_clause
)
)
)
,
try_statement
:
$
=>
seq
(
'try'
,
':'
,
field
(
'body'
,
$
.
_suite
)
,
choice
(
seq
(
repeat1
(
$
.
except_clause
)
,
optional
(
$
.
else_clause
)
,
optional
(
$
.
finally_clause
)
)
,
seq
(
repeat1
(
$
.
except_group_clause
)
,
optional
(
$
.
else_clause
)
,
optional
(
$
.
finally_clause
)
)
,
$
.
finally_clause
)
)
,
exception_list
:
$
=>
seq
(
field
(
'element'
,
$
.
expression
)
,
repeat1
(
seq
(
','
,
field
(
'element'
,
$
.
expression
)
)
)
)
,
except_clause
:
$
=>
seq
(
'except'
,
optional
(
seq
(
field
(
'type'
,
choice
(
$
.
expression
,
$
.
exception_list
)
)
,
optional
(
seq
(
'as'
,
field
(
'alias'
,
$
.
expression
)
)
)
)
)
,
':'
,
field
(
'body'
,
$
.
_suite
)
,
)
,
except_group_clause
:
$
=>
seq
(
'except'
,
'*'
,
seq
(
field
(
'type'
,
choice
(
$
.
expression
,
$
.
exception_list
)
)
,
optional
(
seq
(
'as'
,
field
(
'alias'
,
$
.
expression
)
)
)
)
,
':'
,
field
(
'body'
,
$
.
_suite
)
,
)
,
finally_clause
:
$
=>
seq
(
'finally'
,
':'
,
field
(
'body'
,
$
.
_suite
)
,
)
,
with_statement
:
$
=>
seq
(
optional
(
'async'
)
,
'with'
,
$
.
with_clause
,
':'
,
field
(
'body'
,
$
.
_suite
)
)
,
with_clause
:
$
=>
choice
(
commaSep1
(
$
.
with_item
)
,
seq
(
'('
,
commaSep1
(
$
.
with_item
)
,
optional
(
","
)
,
')'
)
)
,
with_item
:
$
=>
prec
.
dynamic
(
-
1
,
seq
(
field
(
'value'
,
$
.
expression
)
,
optional
(
seq
(
'as'
,
field
(
'alias'
,
$
.
pattern
)
)
)
)
)
,
match_statement
:
$
=>
prec
(
-
3
,
seq
(
'match'
,
field
(
'subject'
,
choice
(
$
.
expression
,
alias
(
$
.
expression_list
,
$
.
tuple
)
,
)
)
,
':'
,
field
(
'cases'
,
$
.
cases
)
)
)
,
cases
:
$
=>
repeat1
(
$
.
case_block
)
,
case_block
:
$
=>
seq
(
'case'
,
field
(
'pattern'
,
$
.
_match_patterns
)
,
optional
(
field
(
'guard'
,
$
.
guard
)
)
,
':'
,
field
(
'body'
,
$
.
_suite
)
)
,
_match_patterns
:
$
=>
choice
(
$
.
_match_pattern
,
alias
(
$
.
open_sequence_match_pattern
,
$
.
match_sequence_pattern
)
)
,
open_sequence_match_pattern
:
$
=>
open_sequence
(
$
.
_match_maybe_star_pattern
)
,
_match_pattern
:
$
=>
choice
(
$
.
match_as_pattern
,
$
.
_match_or_pattern
)
,
match_as_pattern
:
$
=>
seq
(
field
(
'pattern'
,
$
.
_match_or_pattern
)
,
'as'
,
field
(
'alias'
,
$
.
identifier
)
)
,
_match_or_pattern
:
$
=>
choice
(
$
.
match_or_pattern
,
$
.
_closed_pattern
)
,
match_or_pattern
:
$
=>
seq
(
$
.
_closed_pattern
,
'|'
,
sep1
(
$
.
_closed_pattern
,
'|'
)
)
,
_closed_pattern
:
$
=>
choice
(
$
.
match_literal_pattern
,
$
.
match_capture_pattern
,
$
.
match_wildcard_pattern
,
$
.
match_value_pattern
,
$
.
match_group_pattern
,
$
.
match_sequence_pattern
,
$
.
match_mapping_pattern
,
$
.
match_class_pattern
)
,
match_literal_pattern
:
$
=>
choice
(
seq
(
optional
(
field
(
'prefix_operator'
,
'-'
)
)
,
field
(
'real'
,
choice
(
$
.
integer
,
$
.
float
)
)
,
optional
(
seq
(
field
(
'operator'
,
choice
(
'+'
,
'-'
)
)
,
field
(
'imaginary'
,
choice
(
$
.
integer
,
$
.
float
)
)
)
)
)
,
$
.
string
,
$
.
concatenated_string
,
$
.
template_string
,
$
.
concatenated_template_string
,
$
.
none
,
$
.
true
,
$
.
false
)
,
match_capture_pattern
:
$
=>
$
.
identifier
,
match_wildcard_pattern
:
$
=>
'_'
,
match_value_pattern
:
$
=>
seq
(
$
.
identifier
,
repeat1
(
seq
(
'.'
,
$
.
identifier
)
)
)
,
match_group_pattern
:
$
=>
seq
(
'('
,
field
(
'content'
,
$
.
_match_pattern
)
,
')'
)
,
match_sequence_pattern
:
$
=>
choice
(
seq
(
'['
,
optional
(
seq
(
commaSep1
(
$
.
_match_maybe_star_pattern
)
,
optional
(
','
)
)
)
,
']'
)
,
seq
(
'('
,
optional
(
open_sequence
(
$
.
_match_maybe_star_pattern
)
)
,
')'
)
)
,
_match_maybe_star_pattern
:
$
=>
choice
(
$
.
_match_pattern
,
$
.
match_star_pattern
)
,
match_star_pattern
:
$
=>
seq
(
'*'
,
field
(
'target'
,
choice
(
$
.
match_wildcard_pattern
,
$
.
match_capture_pattern
)
)
)
,
match_mapping_pattern
:
$
=>
choice
(
seq
(
'{'
,
optional
(
seq
(
$
.
match_double_star_pattern
,
optional
(
','
)
)
)
,
'}'
)
,
seq
(
'{'
,
commaSep1
(
$
.
match_key_value_pattern
)
,
optional
(
seq
(
','
,
$
.
match_double_star_pattern
)
)
,
optional
(
','
)
,
'}'
)
)
,
match_double_star_pattern
:
$
=>
seq
(
'**'
,
field
(
'target'
,
$
.
match_capture_pattern
)
)
,
match_key_value_pattern
:
$
=>
seq
(
field
(
'key'
,
choice
(
$
.
match_literal_pattern
,
$
.
match_value_pattern
)
)
,
':'
,
field
(
'value'
,
$
.
_match_pattern
)
)
,
match_class_pattern
:
$
=>
seq
(
field
(
'class'
,
$
.
pattern_class_name
)
,
choice
(
seq
(
'('
,
')'
)
,
seq
(
'('
,
seq
(
commaSep1
(
$
.
match_positional_pattern
)
,
optional
(
','
)
)
,
')'
)
,
seq
(
'('
,
seq
(
commaSep1
(
$
.
match_keyword_pattern
)
,
optional
(
','
)
)
,
')'
)
,
seq
(
'('
,
commaSep1
(
$
.
match_positional_pattern
)
,
','
,
commaSep1
(
$
.
match_keyword_pattern
)
,
optional
(
','
)
,
')'
)
)
)
,
pattern_class_name
:
$
=>
sep1
(
$
.
identifier
,
'.'
)
,
match_positional_pattern
:
$
=>
$
.
_match_pattern
,
match_keyword_pattern
:
$
=>
seq
(
field
(
'attribute'
,
$
.
identifier
)
,
'='
,
field
(
'value'
,
$
.
_match_pattern
)
)
,
guard
:
$
=>
seq
(
'if'
,
field
(
'test'
,
$
.
expression
)
)
,
function_definition
:
$
=>
seq
(
optional
(
'async'
)
,
'def'
,
field
(
'name'
,
$
.
identifier
)
,
optional
(
field
(
'type_parameters'
,
$
.
type_parameters
)
)
,
field
(
'parameters'
,
$
.
parameters
)
,
optional
(
seq
(
'->'
,
field
(
'return_type'
,
$
.
type
)
)
)
,
':'
,
field
(
'body'
,
$
.
_suite
)
)
,
parameters
:
$
=>
seq
(
'('
,
optional
(
$
.
_parameters
)
,
')'
)
,
lambda_parameters
:
$
=>
$
.
_parameters
,
list_splat
:
$
=>
seq
(
'*'
,
$
.
expression
,
)
,
dictionary_splat
:
$
=>
seq
(
'**'
,
field
(
'value'
,
$
.
expression
)
,
)
,
global_statement
:
$
=>
seq
(
'global'
,
commaSep1
(
$
.
identifier
)
)
,
nonlocal_statement
:
$
=>
seq
(
'nonlocal'
,
commaSep1
(
$
.
identifier
)
)
,
exec_statement
:
$
=>
seq
(
'exec'
,
field
(
'code'
,
$
.
string
)
,
optional
(
seq
(
'in'
,
commaSep1
(
$
.
expression
)
)
)
)
,
type_alias_statement
:
$
=>
seq
(
'type'
,
field
(
'name'
,
$
.
identifier
)
,
optional
(
field
(
'type_parameters'
,
$
.
type_parameters
)
)
,
'='
,
field
(
'value'
,
$
.
expression
)
)
,
class_definition
:
$
=>
seq
(
'class'
,
field
(
'name'
,
$
.
identifier
)
,
optional
(
field
(
'type_parameters'
,
$
.
type_parameters
)
)
,
field
(
'superclasses'
,
optional
(
$
.
argument_list
)
)
,
':'
,
field
(
'body'
,
$
.
_suite
)
)
,
type_parameters
:
$
=>
seq
(
'['
,
commaSep1
(
field
(
'type_parameter'
,
$
.
_type_parameter
)
)
,
']'
)
,
_type_bound
:
$
=>
seq
(
':'
,
field
(
'bound'
,
$
.
expression
)
)
,
typevar_parameter
:
$
=>
seq
(
field
(
'name'
,
$
.
identifier
)
,
optional
(
$
.
_type_bound
)
,
optional
(
$
.
_type_param_default
)
)
,
typevartuple_parameter
:
$
=>
seq
(
'*'
,
field
(
'name'
,
$
.
identifier
)
,
optional
(
$
.
_type_param_default
)
)
,
paramspec_parameter
:
$
=>
seq
(
'**'
,
field
(
'name'
,
$
.
identifier
)
,
optional
(
$
.
_type_param_default
)
,
)
,
_type_parameter
:
$
=>
choice
(
$
.
typevar_parameter
,
$
.
typevartuple_parameter
,
$
.
paramspec_parameter
,
)
,
_type_param_default
:
$
=>
seq
(
'='
,
field
(
'default'
,
choice
(
$
.
list_splat
,
$
.
expression
)
)
)
,
parenthesized_list_splat
:
$
=>
prec
(
PREC
.
parenthesized_list_splat
,
seq
(
'('
,
choice
(
alias
(
$
.
parenthesized_list_splat
,
$
.
parenthesized_expression
)
,
$
.
list_splat
,
)
,
')'
,
)
)
,
argument_list
:
$
=>
seq
(
'('
,
optional
(
commaSep1
(
field
(
'element'
,
choice
(
$
.
expression
,
$
.
list_splat
,
$
.
dictionary_splat
,
alias
(
$
.
parenthesized_list_splat
,
$
.
parenthesized_expression
)
,
$
.
keyword_argument
)
)
)
)
,
optional
(
','
)
,
')'
)
,
decorated_definition
:
$
=>
seq
(
repeat1
(
$
.
decorator
)
,
field
(
'definition'
,
choice
(
$
.
class_definition
,
$
.
function_definition
)
)
)
,
decorator
:
$
=>
seq
(
'@'
,
$
.
expression
,
$
.
_newline
)
,
_suite
:
$
=>
choice
(
alias
(
$
.
_simple_statements
,
$
.
block
)
,
seq
(
$
.
_indent
,
$
.
block
)
,
alias
(
$
.
_newline
,
$
.
block
)
)
,
block
:
$
=>
seq
(
repeat
(
$
.
_statement
)
,
$
.
_dedent
)
,
expression_list
:
$
=>
open_sequence
(
field
(
'element'
,
choice
(
$
.
expression
,
$
.
list_splat
,
$
.
dictionary_splat
)
)
)
,
dotted_name
:
$
=>
sep1
(
$
.
identifier
,
'.'
)
,
// Patterns
_parameters
:
$
=>
seq
(
commaSep1
(
$
.
parameter
)
,
optional
(
','
)
)
,
_patterns
:
$
=>
seq
(
commaSep1
(
field
(
'element'
,
$
.
pattern
)
)
,
optional
(
field
(
'trailing_comma'
,
','
)
)
)
,
parameter
:
$
=>
choice
(
$
.
identifier
,
$
.
typed_parameter
,
$
.
default_parameter
,
$
.
typed_default_parameter
,
$
.
list_splat_pattern
,
$
.
tuple_pattern
,
$
.
keyword_separator
,
$
.
positional_separator
,
$
.
dictionary_splat_pattern
)
,
pattern
:
$
=>
choice
(
$
.
identifier
,
$
.
keyword_identifier
,
$
.
subscript
,
$
.
attribute
,
$
.
list_splat_pattern
,
$
.
tuple_pattern
,
$
.
list_pattern
)
,
tuple_pattern
:
$
=>
seq
(
'('
,
optional
(
$
.
_patterns
)
,
')'
)
,
list_pattern
:
$
=>
seq
(
'['
,
optional
(
$
.
_patterns
)
,
']'
)
,
default_parameter
:
$
=>
seq
(
field
(
'name'
,
$
.
identifier
)
,
'='
,
field
(
'value'
,
$
.
expression
)
)
,
typed_default_parameter
:
$
=>
prec
(
PREC
.
typed_parameter
,
seq
(
field
(
'name'
,
$
.
identifier
)
,
':'
,
field
(
'type'
,
$
.
type
)
,
'='
,
field
(
'value'
,
$
.
expression
)
)
)
,
list_splat_pattern
:
$
=>
seq
(
'*'
,
field
(
'vararg'
,
choice
(
$
.
identifier
,
$
.
keyword_identifier
,
$
.
subscript
,
$
.
attribute
)
)
)
,
dictionary_splat_pattern
:
$
=>
seq
(
'**'
,
field
(
'kwarg'
,
choice
(
$
.
identifier
,
$
.
keyword_identifier
,
$
.
subscript
,
$
.
attribute
)
)
)
,
// Expressions
_expression_within_for_in_clause
:
$
=>
choice
(
$
.
expression
,
alias
(
$
.
lambda_within_for_in_clause
,
$
.
lambda
)
)
,
expression
:
$
=>
choice
(
$
.
comparison_operator
,
$
.
not_operator
,
$
.
boolean_operator
,
$
.
lambda
,
$
.
primary_expression
,
$
.
conditional_expression
,
$
.
named_expression
)
,
primary_expression
:
$
=>
choice
(
$
.
await
,
$
.
binary_operator
,
$
.
identifier
,
$
.
keyword_identifier
,
$
.
string
,
$
.
concatenated_string
,
$
.
template_string
,
$
.
concatenated_template_string
,
$
.
integer
,
$
.
float
,
$
.
true
,
$
.
false
,
$
.
none
,
$
.
unary_operator
,
$
.
attribute
,
$
.
subscript
,
$
.
call
,
$
.
list
,
$
.
list_comprehension
,
$
.
dictionary
,
$
.
dictionary_comprehension
,
$
.
set
,
$
.
set_comprehension
,
$
.
tuple
,
$
.
parenthesized_expression
,
$
.
generator_expression
,
$
.
ellipsis
)
,
not_operator
:
$
=>
prec
(
PREC
.
not
,
seq
(
'not'
,
field
(
'argument'
,
$
.
expression
)
)
)
,
boolean_operator
:
$
=>
choice
(
prec
.
right
(
PREC
.
and
,
seq
(
field
(
'left'
,
$
.
expression
)
,
field
(
'operator'
,
'and'
)
,
field
(
'right'
,
$
.
expression
)
)
)
,
prec
.
right
(
PREC
.
or
,
seq
(
field
(
'left'
,
$
.
expression
)
,
field
(
'operator'
,
'or'
)
,
field
(
'right'
,
$
.
expression
)
)
)
)
,
binary_operator
:
$
=>
{
const
table
=
[
[
prec
.
left
,
'+'
,
PREC
.
plus
]
,
[
prec
.
left
,
'-'
,
PREC
.
plus
]
,
[
prec
.
left
,
'*'
,
PREC
.
times
]
,
[
prec
.
left
,
'@'
,
PREC
.
times
]
,
[
prec
.
left
,
'/'
,
PREC
.
times
]
,
[
prec
.
left
,
'%'
,
PREC
.
times
]
,
[
prec
.
left
,
'//'
,
PREC
.
times
]
,
[
prec
.
right
,
'**'
,
PREC
.
power
]
,
[
prec
.
left
,
'|'
,
PREC
.
bitwise_or
]
,
[
prec
.
left
,
'&'
,
PREC
.
bitwise_and
]
,
[
prec
.
left
,
'^'
,
PREC
.
xor
]
,
[
prec
.
left
,
'<<'
,
PREC
.
shift
]
,
[
prec
.
left
,
'>>'
,
PREC
.
shift
]
,
]
;
return
choice
(
...
table
.
map
(
(
[
fn
,
operator
,
precedence
]
)
=>
fn
(
precedence
,
seq
(
field
(
'left'
,
$
.
primary_expression
)
,
field
(
'operator'
,
operator
)
,
field
(
'right'
,
$
.
primary_expression
)
)
)
)
)
;
}
,
unary_operator
:
$
=>
prec
(
PREC
.
unary
,
seq
(
field
(
'operator'
,
choice
(
'+'
,
'-'
,
'~'
)
)
,
field
(
'argument'
,
$
.
primary_expression
)
)
)
,
comparison_operator
:
$
=>
prec
.
left
(
PREC
.
compare
,
seq
(
$
.
primary_expression
,
repeat1
(
seq
(
field
(
'operators'
,
choice
(
'<'
,
'<='
,
'=='
,
'!='
,
'>='
,
'>'
,
'<>'
,
'in'
,
alias
(
seq
(
'not'
,
'in'
)
,
'not in'
)
,
'is'
,
alias
(
seq
(
'is'
,
'not'
)
,
'is not'
)
)
)
,
$
.
primary_expression
)
)
)
)
,
lambda
:
$
=>
prec
(
PREC
.
lambda
,
seq
(
'lambda'
,
field
(
'parameters'
,
optional
(
$
.
lambda_parameters
)
)
,
':'
,
field
(
'body'
,
$
.
expression
)
)
)
,
lambda_within_for_in_clause
:
$
=>
seq
(
'lambda'
,
field
(
'parameters'
,
optional
(
$
.
lambda_parameters
)
)
,
':'
,
field
(
'body'
,
$
.
_expression_within_for_in_clause
)
)
,
assignment
:
$
=>
seq
(
field
(
'left'
,
$
.
_left_hand_side
)
,
choice
(
seq
(
'='
,
field
(
'right'
,
$
.
_right_hand_side
)
)
,
seq
(
':'
,
field
(
'type'
,
$
.
type
)
)
,
seq
(
':'
,
field
(
'type'
,
$
.
type
)
,
'='
,
field
(
'right'
,
$
.
_right_hand_side
)
)
)
)
,
augmented_assignment
:
$
=>
seq
(
field
(
'left'
,
$
.
_left_hand_side
)
,
field
(
'operator'
,
choice
(
'+='
,
'-='
,
'*='
,
'/='
,
'@='
,
'//='
,
'%='
,
'**='
,
'>>='
,
'<<='
,
'&='
,
'^='
,
'|='
)
)
,
field
(
'right'
,
$
.
_right_hand_side
)
)
,
_left_hand_side
:
$
=>
choice
(
$
.
pattern
,
$
.
pattern_list
)
,
pattern_list
:
$
=>
seq
(
field
(
'element'
,
$
.
pattern
)
,
choice
(
','
,
seq
(
repeat1
(
seq
(
','
,
field
(
'element'
,
$
.
pattern
)
)
)
,
optional
(
','
)
)
)
)
,
_right_hand_side
:
$
=>
choice
(
$
.
expression
,
$
.
expression_list
,
$
.
assignment
,
$
.
augmented_assignment
,
$
.
yield
)
,
yield
:
$
=>
prec
.
right
(
seq
(
'yield'
,
choice
(
seq
(
'from'
,
$
.
expression
)
,
optional
(
$
.
_expressions
)
)
)
)
,
attribute
:
$
=>
prec
(
PREC
.
call
,
seq
(
field
(
'object'
,
$
.
primary_expression
)
,
'.'
,
field
(
'attribute'
,
$
.
identifier
)
)
)
,
_index_expression
:
$
=>
choice
(
$
.
list_splat
,
$
.
expression
,
$
.
slice
)
,
index_expression_list
:
$
=>
open_sequence
(
field
(
'element'
,
$
.
_index_expression
)
)
,
subscript
:
$
=>
prec
(
PREC
.
call
,
seq
(
field
(
'value'
,
$
.
primary_expression
)
,
'['
,
field
(
'subscript'
,
choice
(
$
.
_index_expression
,
$
.
index_expression_list
)
)
,
']'
)
)
,
slice
:
$
=>
seq
(
optional
(
field
(
'start'
,
$
.
expression
)
)
,
':'
,
optional
(
field
(
'stop'
,
$
.
expression
)
)
,
optional
(
seq
(
':'
,
optional
(
field
(
'step'
,
$
.
expression
)
)
)
)
)
,
ellipsis
:
$
=>
'...'
,
call
:
$
=>
prec
(
PREC
.
call
,
seq
(
field
(
'function'
,
$
.
primary_expression
)
,
field
(
'arguments'
,
choice
(
$
.
generator_expression
,
$
.
argument_list
)
)
)
)
,
typed_parameter
:
$
=>
prec
(
PREC
.
typed_parameter
,
seq
(
choice
(
$
.
identifier
,
$
.
list_splat_pattern
,
$
.
dictionary_splat_pattern
)
,
':'
,
field
(
'type'
,
$
.
type
)
)
)
,
type
:
$
=>
choice
(
$
.
list_splat
,
$
.
expression
)
,
keyword_argument
:
$
=>
seq
(
field
(
'name'
,
choice
(
$
.
identifier
,
$
.
keyword_identifier
)
)
,
'='
,
field
(
'value'
,
$
.
expression
)
)
,
// Literals
list
:
$
=>
seq
(
'['
,
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