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cpython/Grammar/python.gram
Pablo Galindo c878a97968
bpo-44180: Fix edge cases in invalid assigment rules in the parser (GH-26283) 
The invalid assignment rules are very delicate since the parser can
easily raise an invalid assignment when a keyword argument is provided.
As they are very deep into the grammar tree, is very difficult to
specify in which contexts these rules can be used and in which don't.
For that, we need to use a different version of the rule that doesn't do
error checking in those situations where we don't want the rule to raise
(keyword arguments and generator expressions).

We also need to check if we are in left-recursive rule, as those can try
to eagerly advance the parser even if the parse will fail at the end of
the expression. Failing to do this allows the parser to start parsing a
call as a tuple and incorrectly identify a keyword argument as an
invalid assignment, before it realizes that it was not a tuple after all.
2021-05-21 18:34:54 +01:00

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# PEG grammar for Python
@trailer '''
void *
_PyPegen_parse(Parser *p)
{
// Initialize keywords
p->keywords = reserved_keywords;
p->n_keyword_lists = n_keyword_lists;
p->soft_keywords = soft_keywords;
// Run parser
void *result = NULL;
if (p->start_rule == Py_file_input) {
result = file_rule(p);
} else if (p->start_rule == Py_single_input) {
result = interactive_rule(p);
} else if (p->start_rule == Py_eval_input) {
result = eval_rule(p);
} else if (p->start_rule == Py_func_type_input) {
result = func_type_rule(p);
} else if (p->start_rule == Py_fstring_input) {
result = fstring_rule(p);
}
return result;
}
// The end
'''
file[mod_ty]: a=[statements] ENDMARKER { _PyPegen_make_module(p, a) }
interactive[mod_ty]: a=statement_newline { _PyAST_Interactive(a, p->arena) }
eval[mod_ty]: a=expressions NEWLINE* ENDMARKER { _PyAST_Expression(a, p->arena) }
func_type[mod_ty]: '(' a=[type_expressions] ')' '->' b=expression NEWLINE* ENDMARKER { _PyAST_FunctionType(a, b, p->arena) }
fstring[expr_ty]: star_expressions
# type_expressions allow */** but ignore them
type_expressions[asdl_expr_seq*]:
| a=','.expression+ ',' '*' b=expression ',' '**' c=expression {
(asdl_expr_seq*)_PyPegen_seq_append_to_end(
p,
CHECK(asdl_seq*, _PyPegen_seq_append_to_end(p, a, b)),
c) }
| a=','.expression+ ',' '*' b=expression { (asdl_expr_seq*)_PyPegen_seq_append_to_end(p, a, b) }
| a=','.expression+ ',' '**' b=expression { (asdl_expr_seq*)_PyPegen_seq_append_to_end(p, a, b) }
| '*' a=expression ',' '**' b=expression {
(asdl_expr_seq*)_PyPegen_seq_append_to_end(
p,
CHECK(asdl_seq*, _PyPegen_singleton_seq(p, a)),
b) }
| '*' a=expression { (asdl_expr_seq*)_PyPegen_singleton_seq(p, a) }
| '**' a=expression { (asdl_expr_seq*)_PyPegen_singleton_seq(p, a) }
| a[asdl_expr_seq*]=','.expression+ {a}
statements[asdl_stmt_seq*]: a=statement+ { (asdl_stmt_seq*)_PyPegen_seq_flatten(p, a) }
statement[asdl_stmt_seq*]: a=compound_stmt { (asdl_stmt_seq*)_PyPegen_singleton_seq(p, a) } | a[asdl_stmt_seq*]=simple_stmts { a }
statement_newline[asdl_stmt_seq*]:
| a=compound_stmt NEWLINE { (asdl_stmt_seq*)_PyPegen_singleton_seq(p, a) }
| simple_stmts
| NEWLINE { (asdl_stmt_seq*)_PyPegen_singleton_seq(p, CHECK(stmt_ty, _PyAST_Pass(EXTRA))) }
| ENDMARKER { _PyPegen_interactive_exit(p) }
simple_stmts[asdl_stmt_seq*]:
| a=simple_stmt !';' NEWLINE { (asdl_stmt_seq*)_PyPegen_singleton_seq(p, a) } # Not needed, there for speedup
| a[asdl_stmt_seq*]=';'.simple_stmt+ [';'] NEWLINE { a }
# NOTE: assignment MUST precede expression, else parsing a simple assignment
# will throw a SyntaxError.
simple_stmt[stmt_ty] (memo):
| assignment
| e=star_expressions { _PyAST_Expr(e, EXTRA) }
| &'return' return_stmt
| &('import' | 'from') import_stmt
| &'raise' raise_stmt
| 'pass' { _PyAST_Pass(EXTRA) }
| &'del' del_stmt
| &'yield' yield_stmt
| &'assert' assert_stmt
| 'break' { _PyAST_Break(EXTRA) }
| 'continue' { _PyAST_Continue(EXTRA) }
| &'global' global_stmt
| &'nonlocal' nonlocal_stmt
compound_stmt[stmt_ty]:
| &('def' | '@' | ASYNC) function_def
| &'if' if_stmt
| &('class' | '@') class_def
| &('with' | ASYNC) with_stmt
| &('for' | ASYNC) for_stmt
| &'try' try_stmt
| &'while' while_stmt
| match_stmt
# NOTE: annotated_rhs may start with 'yield'; yield_expr must start with 'yield'
assignment[stmt_ty]:
| a=NAME ':' b=expression c=['=' d=annotated_rhs { d }] {
CHECK_VERSION(
stmt_ty,
6,
"Variable annotation syntax is",
_PyAST_AnnAssign(CHECK(expr_ty, _PyPegen_set_expr_context(p, a, Store)), b, c, 1, EXTRA)
) }
| a=('(' b=single_target ')' { b }
| single_subscript_attribute_target) ':' b=expression c=['=' d=annotated_rhs { d }] {
CHECK_VERSION(stmt_ty, 6, "Variable annotations syntax is", _PyAST_AnnAssign(a, b, c, 0, EXTRA)) }
| a[asdl_expr_seq*]=(z=star_targets '=' { z })+ b=(yield_expr | star_expressions) !'=' tc=[TYPE_COMMENT] {
_PyAST_Assign(a, b, NEW_TYPE_COMMENT(p, tc), EXTRA) }
| a=single_target b=augassign ~ c=(yield_expr | star_expressions) {
_PyAST_AugAssign(a, b->kind, c, EXTRA) }
| invalid_assignment
augassign[AugOperator*]:
| '+=' { _PyPegen_augoperator(p, Add) }
| '-=' { _PyPegen_augoperator(p, Sub) }
| '*=' { _PyPegen_augoperator(p, Mult) }
| '@=' { CHECK_VERSION(AugOperator*, 5, "The '@' operator is", _PyPegen_augoperator(p, MatMult)) }
| '/=' { _PyPegen_augoperator(p, Div) }
| '%=' { _PyPegen_augoperator(p, Mod) }
| '&=' { _PyPegen_augoperator(p, BitAnd) }
| '|=' { _PyPegen_augoperator(p, BitOr) }
| '^=' { _PyPegen_augoperator(p, BitXor) }
| '<<=' { _PyPegen_augoperator(p, LShift) }
| '>>=' { _PyPegen_augoperator(p, RShift) }
| '**=' { _PyPegen_augoperator(p, Pow) }
| '//=' { _PyPegen_augoperator(p, FloorDiv) }
global_stmt[stmt_ty]: 'global' a[asdl_expr_seq*]=','.NAME+ {
_PyAST_Global(CHECK(asdl_identifier_seq*, _PyPegen_map_names_to_ids(p, a)), EXTRA) }
nonlocal_stmt[stmt_ty]: 'nonlocal' a[asdl_expr_seq*]=','.NAME+ {
_PyAST_Nonlocal(CHECK(asdl_identifier_seq*, _PyPegen_map_names_to_ids(p, a)), EXTRA) }
yield_stmt[stmt_ty]: y=yield_expr { _PyAST_Expr(y, EXTRA) }
assert_stmt[stmt_ty]: 'assert' a=expression b=[',' z=expression { z }] { _PyAST_Assert(a, b, EXTRA) }
del_stmt[stmt_ty]:
| 'del' a=del_targets &(';' | NEWLINE) { _PyAST_Delete(a, EXTRA) }
| invalid_del_stmt
import_stmt[stmt_ty]: import_name | import_from
import_name[stmt_ty]: 'import' a=dotted_as_names { _PyAST_Import(a, EXTRA) }
# note below: the ('.' | '...') is necessary because '...' is tokenized as ELLIPSIS
import_from[stmt_ty]:
| 'from' a=('.' | '...')* b=dotted_name 'import' c=import_from_targets {
_PyAST_ImportFrom(b->v.Name.id, c, _PyPegen_seq_count_dots(a), EXTRA) }
| 'from' a=('.' | '...')+ 'import' b=import_from_targets {
_PyAST_ImportFrom(NULL, b, _PyPegen_seq_count_dots(a), EXTRA) }
import_from_targets[asdl_alias_seq*]:
| '(' a=import_from_as_names [','] ')' { a }
| import_from_as_names !','
| '*' { (asdl_alias_seq*)_PyPegen_singleton_seq(p, CHECK(alias_ty, _PyPegen_alias_for_star(p, EXTRA))) }
| invalid_import_from_targets
import_from_as_names[asdl_alias_seq*]:
| a[asdl_alias_seq*]=','.import_from_as_name+ { a }
import_from_as_name[alias_ty]:
| a=NAME b=['as' z=NAME { z }] { _PyAST_alias(a->v.Name.id,
(b) ? ((expr_ty) b)->v.Name.id : NULL,
EXTRA) }
dotted_as_names[asdl_alias_seq*]:
| a[asdl_alias_seq*]=','.dotted_as_name+ { a }
dotted_as_name[alias_ty]:
| a=dotted_name b=['as' z=NAME { z }] { _PyAST_alias(a->v.Name.id,
(b) ? ((expr_ty) b)->v.Name.id : NULL,
EXTRA) }
dotted_name[expr_ty]:
| a=dotted_name '.' b=NAME { _PyPegen_join_names_with_dot(p, a, b) }
| NAME
if_stmt[stmt_ty]:
| invalid_if_stmt
| 'if' a=named_expression ':' b=block c=elif_stmt {
_PyAST_If(a, b, CHECK(asdl_stmt_seq*, _PyPegen_singleton_seq(p, c)), EXTRA) }
| 'if' a=named_expression ':' b=block c=[else_block] { _PyAST_If(a, b, c, EXTRA) }
elif_stmt[stmt_ty]:
| invalid_elif_stmt
| 'elif' a=named_expression ':' b=block c=elif_stmt {
_PyAST_If(a, b, CHECK(asdl_stmt_seq*, _PyPegen_singleton_seq(p, c)), EXTRA) }
| 'elif' a=named_expression ':' b=block c=[else_block] { _PyAST_If(a, b, c, EXTRA) }
else_block[asdl_stmt_seq*]:
| invalid_else_stmt
| 'else' &&':' b=block { b }
while_stmt[stmt_ty]:
| invalid_while_stmt
| 'while' a=named_expression ':' b=block c=[else_block] { _PyAST_While(a, b, c, EXTRA) }
for_stmt[stmt_ty]:
| invalid_for_stmt
| 'for' t=star_targets 'in' ~ ex=star_expressions &&':' tc=[TYPE_COMMENT] b=block el=[else_block] {
_PyAST_For(t, ex, b, el, NEW_TYPE_COMMENT(p, tc), EXTRA) }
| ASYNC 'for' t=star_targets 'in' ~ ex=star_expressions &&':' tc=[TYPE_COMMENT] b=block el=[else_block] {
CHECK_VERSION(stmt_ty, 5, "Async for loops are", _PyAST_AsyncFor(t, ex, b, el, NEW_TYPE_COMMENT(p, tc), EXTRA)) }
| invalid_for_target
with_stmt[stmt_ty]:
| invalid_with_stmt_indent
| 'with' '(' a[asdl_withitem_seq*]=','.with_item+ ','? ')' ':' b=block {
_PyAST_With(a, b, NULL, EXTRA) }
| 'with' a[asdl_withitem_seq*]=','.with_item+ ':' tc=[TYPE_COMMENT] b=block {
_PyAST_With(a, b, NEW_TYPE_COMMENT(p, tc), EXTRA) }
| ASYNC 'with' '(' a[asdl_withitem_seq*]=','.with_item+ ','? ')' ':' b=block {
CHECK_VERSION(stmt_ty, 5, "Async with statements are", _PyAST_AsyncWith(a, b, NULL, EXTRA)) }
| ASYNC 'with' a[asdl_withitem_seq*]=','.with_item+ ':' tc=[TYPE_COMMENT] b=block {
CHECK_VERSION(stmt_ty, 5, "Async with statements are", _PyAST_AsyncWith(a, b, NEW_TYPE_COMMENT(p, tc), EXTRA)) }
| invalid_with_stmt
with_item[withitem_ty]:
| e=expression 'as' t=star_target &(',' | ')' | ':') { _PyAST_withitem(e, t, p->arena) }
| invalid_with_item
| e=expression { _PyAST_withitem(e, NULL, p->arena) }
try_stmt[stmt_ty]:
| invalid_try_stmt
| 'try' &&':' b=block f=finally_block { _PyAST_Try(b, NULL, NULL, f, EXTRA) }
| 'try' &&':' b=block ex[asdl_excepthandler_seq*]=except_block+ el=[else_block] f=[finally_block] { _PyAST_Try(b, ex, el, f, EXTRA) }
except_block[excepthandler_ty]:
| invalid_except_stmt_indent
| 'except' e=expression t=['as' z=NAME { z }] ':' b=block {
_PyAST_ExceptHandler(e, (t) ? ((expr_ty) t)->v.Name.id : NULL, b, EXTRA) }
| 'except' ':' b=block { _PyAST_ExceptHandler(NULL, NULL, b, EXTRA) }
| invalid_except_stmt
finally_block[asdl_stmt_seq*]:
| invalid_finally_stmt
| 'finally' &&':' a=block { a }
match_stmt[stmt_ty]:
| "match" subject=subject_expr ':' NEWLINE INDENT cases[asdl_match_case_seq*]=case_block+ DEDENT {
CHECK_VERSION(stmt_ty, 10, "Pattern matching is", _PyAST_Match(subject, cases, EXTRA)) }
| invalid_match_stmt
subject_expr[expr_ty]:
| value=star_named_expression ',' values=star_named_expressions? {
_PyAST_Tuple(CHECK(asdl_expr_seq*, _PyPegen_seq_insert_in_front(p, value, values)), Load, EXTRA) }
| named_expression
case_block[match_case_ty]:
| invalid_case_block
| "case" pattern=patterns guard=guard? ':' body=block {
_PyAST_match_case(pattern, guard, body, p->arena) }
guard[expr_ty]: 'if' guard=named_expression { guard }
patterns[pattern_ty]:
| patterns[asdl_pattern_seq*]=open_sequence_pattern {
_PyAST_MatchSequence(patterns, EXTRA) }
| pattern
pattern[pattern_ty]:
| as_pattern
| or_pattern
as_pattern[pattern_ty]:
| pattern=or_pattern 'as' target=pattern_capture_target {
_PyAST_MatchAs(pattern, target->v.Name.id, EXTRA) }
or_pattern[pattern_ty]:
| patterns[asdl_pattern_seq*]='|'.closed_pattern+ {
asdl_seq_LEN(patterns) == 1 ? asdl_seq_GET(patterns, 0) : _PyAST_MatchOr(patterns, EXTRA) }
closed_pattern[pattern_ty]:
| literal_pattern
| capture_pattern
| wildcard_pattern
| value_pattern
| group_pattern
| sequence_pattern
| mapping_pattern
| class_pattern
# Literal patterns are used for equality and identity constraints
literal_pattern[pattern_ty]:
| value=signed_number !('+' | '-') { _PyAST_MatchValue(value, EXTRA) }
| value=complex_number { _PyAST_MatchValue(value, EXTRA) }
| value=strings { _PyAST_MatchValue(value, EXTRA) }
| 'None' { _PyAST_MatchSingleton(Py_None, EXTRA) }
| 'True' { _PyAST_MatchSingleton(Py_True, EXTRA) }
| 'False' { _PyAST_MatchSingleton(Py_False, EXTRA) }
# Literal expressions are used to restrict permitted mapping pattern keys
literal_expr[expr_ty]:
| signed_number !('+' | '-')
| complex_number
| strings
| 'None' { _PyAST_Constant(Py_None, NULL, EXTRA) }
| 'True' { _PyAST_Constant(Py_True, NULL, EXTRA) }
| 'False' { _PyAST_Constant(Py_False, NULL, EXTRA) }
complex_number[expr_ty]:
| real=signed_real_number '+' imag=imaginary_number {
_PyAST_BinOp(real, Add, imag, EXTRA) }
| real=signed_real_number '-' imag=imaginary_number {
_PyAST_BinOp(real, Sub, imag, EXTRA) }
signed_number[expr_ty]:
| NUMBER
| '-' number=NUMBER { _PyAST_UnaryOp(USub, number, EXTRA) }
signed_real_number[expr_ty]:
| real_number
| '-' real=real_number { _PyAST_UnaryOp(USub, real, EXTRA) }
real_number[expr_ty]:
| real=NUMBER { _PyPegen_ensure_real(p, real) }
imaginary_number[expr_ty]:
| imag=NUMBER { _PyPegen_ensure_imaginary(p, imag) }
capture_pattern[pattern_ty]:
| target=pattern_capture_target { _PyAST_MatchAs(NULL, target->v.Name.id, EXTRA) }
pattern_capture_target[expr_ty]:
| !"_" name=NAME !('.' | '(' | '=') {
_PyPegen_set_expr_context(p, name, Store) }
wildcard_pattern[pattern_ty]:
| "_" { _PyAST_MatchAs(NULL, NULL, EXTRA) }
value_pattern[pattern_ty]:
| attr=attr !('.' | '(' | '=') { _PyAST_MatchValue(attr, EXTRA) }
attr[expr_ty]:
| value=name_or_attr '.' attr=NAME {
_PyAST_Attribute(value, attr->v.Name.id, Load, EXTRA) }
name_or_attr[expr_ty]:
| attr
| NAME
group_pattern[pattern_ty]:
| '(' pattern=pattern ')' { pattern }
sequence_pattern[pattern_ty]:
| '[' patterns=maybe_sequence_pattern? ']' { _PyAST_MatchSequence(patterns, EXTRA) }
| '(' patterns=open_sequence_pattern? ')' { _PyAST_MatchSequence(patterns, EXTRA) }
open_sequence_pattern[asdl_seq*]:
| pattern=maybe_star_pattern ',' patterns=maybe_sequence_pattern? {
_PyPegen_seq_insert_in_front(p, pattern, patterns) }
maybe_sequence_pattern[asdl_seq*]:
| patterns=','.maybe_star_pattern+ ','? { patterns }
maybe_star_pattern[pattern_ty]:
| star_pattern
| pattern
star_pattern[pattern_ty]:
| '*' target=pattern_capture_target {
_PyAST_MatchStar(target->v.Name.id, EXTRA) }
| '*' wildcard_pattern {
_PyAST_MatchStar(NULL, EXTRA) }
mapping_pattern[pattern_ty]:
| '{' '}' {
_PyAST_MatchMapping(NULL, NULL, NULL, EXTRA) }
| '{' rest=double_star_pattern ','? '}' {
_PyAST_MatchMapping(NULL, NULL, rest->v.Name.id, EXTRA) }
| '{' items=items_pattern ',' rest=double_star_pattern ','? '}' {
_PyAST_MatchMapping(
CHECK(asdl_expr_seq*, _PyPegen_get_pattern_keys(p, items)),
CHECK(asdl_pattern_seq*, _PyPegen_get_patterns(p, items)),
rest->v.Name.id,
EXTRA) }
| '{' items=items_pattern ','? '}' {
_PyAST_MatchMapping(
CHECK(asdl_expr_seq*, _PyPegen_get_pattern_keys(p, items)),
CHECK(asdl_pattern_seq*, _PyPegen_get_patterns(p, items)),
NULL,
EXTRA) }
items_pattern[asdl_seq*]:
| ','.key_value_pattern+
key_value_pattern[KeyPatternPair*]:
| key=(literal_expr | attr) ':' pattern=pattern {
_PyPegen_key_pattern_pair(p, key, pattern) }
double_star_pattern[expr_ty]:
| '**' target=pattern_capture_target { target }
class_pattern[pattern_ty]:
| cls=name_or_attr '(' ')' {
_PyAST_MatchClass(cls, NULL, NULL, NULL, EXTRA) }
| cls=name_or_attr '(' patterns=positional_patterns ','? ')' {
_PyAST_MatchClass(cls, patterns, NULL, NULL, EXTRA) }
| cls=name_or_attr '(' keywords=keyword_patterns ','? ')' {
_PyAST_MatchClass(
cls, NULL,
CHECK(asdl_identifier_seq*, _PyPegen_map_names_to_ids(p,
CHECK(asdl_expr_seq*, _PyPegen_get_pattern_keys(p, keywords)))),
CHECK(asdl_pattern_seq*, _PyPegen_get_patterns(p, keywords)),
EXTRA) }
| cls=name_or_attr '(' patterns=positional_patterns ',' keywords=keyword_patterns ','? ')' {
_PyAST_MatchClass(
cls,
patterns,
CHECK(asdl_identifier_seq*, _PyPegen_map_names_to_ids(p,
CHECK(asdl_expr_seq*, _PyPegen_get_pattern_keys(p, keywords)))),
CHECK(asdl_pattern_seq*, _PyPegen_get_patterns(p, keywords)),
EXTRA) }
positional_patterns[asdl_pattern_seq*]:
| args[asdl_pattern_seq*]=','.pattern+ { args }
keyword_patterns[asdl_seq*]:
| ','.keyword_pattern+
keyword_pattern[KeyPatternPair*]:
| arg=NAME '=' value=pattern { _PyPegen_key_pattern_pair(p, arg, value) }
return_stmt[stmt_ty]:
| 'return' a=[star_expressions] { _PyAST_Return(a, EXTRA) }
raise_stmt[stmt_ty]:
| 'raise' a=expression b=['from' z=expression { z }] { _PyAST_Raise(a, b, EXTRA) }
| 'raise' { _PyAST_Raise(NULL, NULL, EXTRA) }
function_def[stmt_ty]:
| d=decorators f=function_def_raw { _PyPegen_function_def_decorators(p, d, f) }
| function_def_raw
function_def_raw[stmt_ty]:
| invalid_def_raw
| 'def' n=NAME '(' params=[params] ')' a=['->' z=expression { z }] &&':' tc=[func_type_comment] b=block {
_PyAST_FunctionDef(n->v.Name.id,
(params) ? params : CHECK(arguments_ty, _PyPegen_empty_arguments(p)),
b, NULL, a, NEW_TYPE_COMMENT(p, tc), EXTRA) }
| ASYNC 'def' n=NAME '(' params=[params] ')' a=['->' z=expression { z }] &&':' tc=[func_type_comment] b=block {
CHECK_VERSION(
stmt_ty,
5,
"Async functions are",
_PyAST_AsyncFunctionDef(n->v.Name.id,
(params) ? params : CHECK(arguments_ty, _PyPegen_empty_arguments(p)),
b, NULL, a, NEW_TYPE_COMMENT(p, tc), EXTRA)
) }
func_type_comment[Token*]:
| NEWLINE t=TYPE_COMMENT &(NEWLINE INDENT) { t } # Must be followed by indented block
| invalid_double_type_comments
| TYPE_COMMENT
params[arguments_ty]:
| invalid_parameters
| parameters
parameters[arguments_ty]:
| a=slash_no_default b[asdl_arg_seq*]=param_no_default* c=param_with_default* d=[star_etc] {
_PyPegen_make_arguments(p, a, NULL, b, c, d) }
| a=slash_with_default b=param_with_default* c=[star_etc] {
_PyPegen_make_arguments(p, NULL, a, NULL, b, c) }
| a[asdl_arg_seq*]=param_no_default+ b=param_with_default* c=[star_etc] {
_PyPegen_make_arguments(p, NULL, NULL, a, b, c) }
| a=param_with_default+ b=[star_etc] { _PyPegen_make_arguments(p, NULL, NULL, NULL, a, b)}
| a=star_etc { _PyPegen_make_arguments(p, NULL, NULL, NULL, NULL, a) }
# Some duplication here because we can't write (',' | &')'),
# which is because we don't support empty alternatives (yet).
#
slash_no_default[asdl_arg_seq*]:
| a[asdl_arg_seq*]=param_no_default+ '/' ',' { a }
| a[asdl_arg_seq*]=param_no_default+ '/' &')' { a }
slash_with_default[SlashWithDefault*]:
| a=param_no_default* b=param_with_default+ '/' ',' { _PyPegen_slash_with_default(p, (asdl_arg_seq *)a, b) }
| a=param_no_default* b=param_with_default+ '/' &')' { _PyPegen_slash_with_default(p, (asdl_arg_seq *)a, b) }
star_etc[StarEtc*]:
| '*' a=param_no_default b=param_maybe_default* c=[kwds] {
_PyPegen_star_etc(p, a, b, c) }
| '*' ',' b=param_maybe_default+ c=[kwds] {
_PyPegen_star_etc(p, NULL, b, c) }
| a=kwds { _PyPegen_star_etc(p, NULL, NULL, a) }
| invalid_star_etc
kwds[arg_ty]: '**' a=param_no_default { a }
# One parameter. This *includes* a following comma and type comment.
#
# There are three styles:
# - No default
# - With default
# - Maybe with default
#
# There are two alternative forms of each, to deal with type comments:
# - Ends in a comma followed by an optional type comment
# - No comma, optional type comment, must be followed by close paren
# The latter form is for a final parameter without trailing comma.
#
param_no_default[arg_ty]:
| a=param ',' tc=TYPE_COMMENT? { _PyPegen_add_type_comment_to_arg(p, a, tc) }
| a=param tc=TYPE_COMMENT? &')' { _PyPegen_add_type_comment_to_arg(p, a, tc) }
param_with_default[NameDefaultPair*]:
| a=param c=default ',' tc=TYPE_COMMENT? { _PyPegen_name_default_pair(p, a, c, tc) }
| a=param c=default tc=TYPE_COMMENT? &')' { _PyPegen_name_default_pair(p, a, c, tc) }
param_maybe_default[NameDefaultPair*]:
| a=param c=default? ',' tc=TYPE_COMMENT? { _PyPegen_name_default_pair(p, a, c, tc) }
| a=param c=default? tc=TYPE_COMMENT? &')' { _PyPegen_name_default_pair(p, a, c, tc) }
param[arg_ty]: a=NAME b=annotation? { _PyAST_arg(a->v.Name.id, b, NULL, EXTRA) }
annotation[expr_ty]: ':' a=expression { a }
default[expr_ty]: '=' a=expression { a }
decorators[asdl_expr_seq*]: a[asdl_expr_seq*]=('@' f=named_expression NEWLINE { f })+ { a }
class_def[stmt_ty]:
| a=decorators b=class_def_raw { _PyPegen_class_def_decorators(p, a, b) }
| class_def_raw
class_def_raw[stmt_ty]:
| invalid_class_def_raw
| 'class' a=NAME b=['(' z=[arguments] ')' { z }] &&':' c=block {
_PyAST_ClassDef(a->v.Name.id,
(b) ? ((expr_ty) b)->v.Call.args : NULL,
(b) ? ((expr_ty) b)->v.Call.keywords : NULL,
c, NULL, EXTRA) }
block[asdl_stmt_seq*] (memo):
| NEWLINE INDENT a=statements DEDENT { a }
| simple_stmts
| invalid_block
star_expressions[expr_ty]:
| a=star_expression b=(',' c=star_expression { c })+ [','] {
_PyAST_Tuple(CHECK(asdl_expr_seq*, _PyPegen_seq_insert_in_front(p, a, b)), Load, EXTRA) }
| a=star_expression ',' { _PyAST_Tuple(CHECK(asdl_expr_seq*, _PyPegen_singleton_seq(p, a)), Load, EXTRA) }
| star_expression
star_expression[expr_ty] (memo):
| '*' a=bitwise_or { _PyAST_Starred(a, Load, EXTRA) }
| expression
star_named_expressions[asdl_expr_seq*]: a[asdl_expr_seq*]=','.star_named_expression+ [','] { a }
star_named_expression[expr_ty]:
| '*' a=bitwise_or { _PyAST_Starred(a, Load, EXTRA) }
| named_expression
assigment_expression[expr_ty]:
| a=NAME ':=' ~ b=expression { _PyAST_NamedExpr(CHECK(expr_ty, _PyPegen_set_expr_context(p, a, Store)), b, EXTRA) }
named_expression[expr_ty]:
| assigment_expression
| invalid_named_expression
| expression !':='
annotated_rhs[expr_ty]: yield_expr | star_expressions
expressions[expr_ty]:
| a=expression b=(',' c=expression { c })+ [','] {
_PyAST_Tuple(CHECK(asdl_expr_seq*, _PyPegen_seq_insert_in_front(p, a, b)), Load, EXTRA) }
| a=expression ',' { _PyAST_Tuple(CHECK(asdl_expr_seq*, _PyPegen_singleton_seq(p, a)), Load, EXTRA) }
| expression
expression[expr_ty] (memo):
| invalid_expression
| a=disjunction 'if' b=disjunction 'else' c=expression { _PyAST_IfExp(b, a, c, EXTRA) }
| disjunction
| lambdef
lambdef[expr_ty]:
| 'lambda' a=[lambda_params] ':' b=expression {
_PyAST_Lambda((a) ? a : CHECK(arguments_ty, _PyPegen_empty_arguments(p)), b, EXTRA) }
lambda_params[arguments_ty]:
| invalid_lambda_parameters
| lambda_parameters
# lambda_parameters etc. duplicates parameters but without annotations
# or type comments, and if there's no comma after a parameter, we expect
# a colon, not a close parenthesis. (For more, see parameters above.)
#
lambda_parameters[arguments_ty]:
| a=lambda_slash_no_default b[asdl_arg_seq*]=lambda_param_no_default* c=lambda_param_with_default* d=[lambda_star_etc] {
_PyPegen_make_arguments(p, a, NULL, b, c, d) }
| a=lambda_slash_with_default b=lambda_param_with_default* c=[lambda_star_etc] {
_PyPegen_make_arguments(p, NULL, a, NULL, b, c) }
| a[asdl_arg_seq*]=lambda_param_no_default+ b=lambda_param_with_default* c=[lambda_star_etc] {
_PyPegen_make_arguments(p, NULL, NULL, a, b, c) }
| a=lambda_param_with_default+ b=[lambda_star_etc] { _PyPegen_make_arguments(p, NULL, NULL, NULL, a, b)}
| a=lambda_star_etc { _PyPegen_make_arguments(p, NULL, NULL, NULL, NULL, a) }
lambda_slash_no_default[asdl_arg_seq*]:
| a[asdl_arg_seq*]=lambda_param_no_default+ '/' ',' { a }
| a[asdl_arg_seq*]=lambda_param_no_default+ '/' &':' { a }
lambda_slash_with_default[SlashWithDefault*]:
| a=lambda_param_no_default* b=lambda_param_with_default+ '/' ',' { _PyPegen_slash_with_default(p, (asdl_arg_seq *)a, b) }
| a=lambda_param_no_default* b=lambda_param_with_default+ '/' &':' { _PyPegen_slash_with_default(p, (asdl_arg_seq *)a, b) }
lambda_star_etc[StarEtc*]:
| '*' a=lambda_param_no_default b=lambda_param_maybe_default* c=[lambda_kwds] {
_PyPegen_star_etc(p, a, b, c) }
| '*' ',' b=lambda_param_maybe_default+ c=[lambda_kwds] {
_PyPegen_star_etc(p, NULL, b, c) }
| a=lambda_kwds { _PyPegen_star_etc(p, NULL, NULL, a) }
| invalid_lambda_star_etc
lambda_kwds[arg_ty]: '**' a=lambda_param_no_default { a }
lambda_param_no_default[arg_ty]:
| a=lambda_param ',' { a }
| a=lambda_param &':' { a }
lambda_param_with_default[NameDefaultPair*]:
| a=lambda_param c=default ',' { _PyPegen_name_default_pair(p, a, c, NULL) }
| a=lambda_param c=default &':' { _PyPegen_name_default_pair(p, a, c, NULL) }
lambda_param_maybe_default[NameDefaultPair*]:
| a=lambda_param c=default? ',' { _PyPegen_name_default_pair(p, a, c, NULL) }
| a=lambda_param c=default? &':' { _PyPegen_name_default_pair(p, a, c, NULL) }
lambda_param[arg_ty]: a=NAME { _PyAST_arg(a->v.Name.id, NULL, NULL, EXTRA) }
disjunction[expr_ty] (memo):
| a=conjunction b=('or' c=conjunction { c })+ { _PyAST_BoolOp(
Or,
CHECK(asdl_expr_seq*, _PyPegen_seq_insert_in_front(p, a, b)),
EXTRA) }
| conjunction
conjunction[expr_ty] (memo):
| a=inversion b=('and' c=inversion { c })+ { _PyAST_BoolOp(
And,
CHECK(asdl_expr_seq*, _PyPegen_seq_insert_in_front(p, a, b)),
EXTRA) }
| inversion
inversion[expr_ty] (memo):
| 'not' a=inversion { _PyAST_UnaryOp(Not, a, EXTRA) }
| comparison
comparison[expr_ty]:
| a=bitwise_or b=compare_op_bitwise_or_pair+ {
_PyAST_Compare(
a,
CHECK(asdl_int_seq*, _PyPegen_get_cmpops(p, b)),
CHECK(asdl_expr_seq*, _PyPegen_get_exprs(p, b)),
EXTRA) }
| bitwise_or
compare_op_bitwise_or_pair[CmpopExprPair*]:
| eq_bitwise_or
| noteq_bitwise_or
| lte_bitwise_or
| lt_bitwise_or
| gte_bitwise_or
| gt_bitwise_or
| notin_bitwise_or
| in_bitwise_or
| isnot_bitwise_or
| is_bitwise_or
eq_bitwise_or[CmpopExprPair*]: '==' a=bitwise_or { _PyPegen_cmpop_expr_pair(p, Eq, a) }
noteq_bitwise_or[CmpopExprPair*]:
| (tok='!=' { _PyPegen_check_barry_as_flufl(p, tok) ? NULL : tok}) a=bitwise_or {_PyPegen_cmpop_expr_pair(p, NotEq, a) }
lte_bitwise_or[CmpopExprPair*]: '<=' a=bitwise_or { _PyPegen_cmpop_expr_pair(p, LtE, a) }
lt_bitwise_or[CmpopExprPair*]: '<' a=bitwise_or { _PyPegen_cmpop_expr_pair(p, Lt, a) }
gte_bitwise_or[CmpopExprPair*]: '>=' a=bitwise_or { _PyPegen_cmpop_expr_pair(p, GtE, a) }
gt_bitwise_or[CmpopExprPair*]: '>' a=bitwise_or { _PyPegen_cmpop_expr_pair(p, Gt, a) }
notin_bitwise_or[CmpopExprPair*]: 'not' 'in' a=bitwise_or { _PyPegen_cmpop_expr_pair(p, NotIn, a) }
in_bitwise_or[CmpopExprPair*]: 'in' a=bitwise_or { _PyPegen_cmpop_expr_pair(p, In, a) }
isnot_bitwise_or[CmpopExprPair*]: 'is' 'not' a=bitwise_or { _PyPegen_cmpop_expr_pair(p, IsNot, a) }
is_bitwise_or[CmpopExprPair*]: 'is' a=bitwise_or { _PyPegen_cmpop_expr_pair(p, Is, a) }
bitwise_or[expr_ty]:
| a=bitwise_or '|' b=bitwise_xor { _PyAST_BinOp(a, BitOr, b, EXTRA) }
| bitwise_xor
bitwise_xor[expr_ty]:
| a=bitwise_xor '^' b=bitwise_and { _PyAST_BinOp(a, BitXor, b, EXTRA) }
| bitwise_and
bitwise_and[expr_ty]:
| a=bitwise_and '&' b=shift_expr { _PyAST_BinOp(a, BitAnd, b, EXTRA) }
| shift_expr
shift_expr[expr_ty]:
| a=shift_expr '<<' b=sum { _PyAST_BinOp(a, LShift, b, EXTRA) }
| a=shift_expr '>>' b=sum { _PyAST_BinOp(a, RShift, b, EXTRA) }
| sum
sum[expr_ty]:
| a=sum '+' b=term { _PyAST_BinOp(a, Add, b, EXTRA) }
| a=sum '-' b=term { _PyAST_BinOp(a, Sub, b, EXTRA) }
| term
term[expr_ty]:
| a=term '*' b=factor { _PyAST_BinOp(a, Mult, b, EXTRA) }
| a=term '/' b=factor { _PyAST_BinOp(a, Div, b, EXTRA) }
| a=term '//' b=factor { _PyAST_BinOp(a, FloorDiv, b, EXTRA) }
| a=term '%' b=factor { _PyAST_BinOp(a, Mod, b, EXTRA) }
| a=term '@' b=factor { CHECK_VERSION(expr_ty, 5, "The '@' operator is", _PyAST_BinOp(a, MatMult, b, EXTRA)) }
| factor
factor[expr_ty] (memo):
| '+' a=factor { _PyAST_UnaryOp(UAdd, a, EXTRA) }
| '-' a=factor { _PyAST_UnaryOp(USub, a, EXTRA) }
| '~' a=factor { _PyAST_UnaryOp(Invert, a, EXTRA) }
| power
power[expr_ty]:
| a=await_primary '**' b=factor { _PyAST_BinOp(a, Pow, b, EXTRA) }
| await_primary
await_primary[expr_ty] (memo):
| AWAIT a=primary { CHECK_VERSION(expr_ty, 5, "Await expressions are", _PyAST_Await(a, EXTRA)) }
| primary
primary[expr_ty]:
| invalid_primary # must be before 'primay genexp' because of invalid_genexp
| a=primary '.' b=NAME { _PyAST_Attribute(a, b->v.Name.id, Load, EXTRA) }
| a=primary b=genexp { _PyAST_Call(a, CHECK(asdl_expr_seq*, (asdl_expr_seq*)_PyPegen_singleton_seq(p, b)), NULL, EXTRA) }
| a=primary '(' b=[arguments] ')' {
_PyAST_Call(a,
(b) ? ((expr_ty) b)->v.Call.args : NULL,
(b) ? ((expr_ty) b)->v.Call.keywords : NULL,
EXTRA) }
| a=primary '[' b=slices ']' { _PyAST_Subscript(a, b, Load, EXTRA) }
| atom
slices[expr_ty]:
| a=slice !',' { a }
| a[asdl_expr_seq*]=','.slice+ [','] { _PyAST_Tuple(a, Load, EXTRA) }
slice[expr_ty]:
| a=[expression] ':' b=[expression] c=[':' d=[expression] { d }] { _PyAST_Slice(a, b, c, EXTRA) }
| a=named_expression { a }
atom[expr_ty]:
| NAME
| 'True' { _PyAST_Constant(Py_True, NULL, EXTRA) }
| 'False' { _PyAST_Constant(Py_False, NULL, EXTRA) }
| 'None' { _PyAST_Constant(Py_None, NULL, EXTRA) }
| &STRING strings
| NUMBER
| &'(' (tuple | group | genexp)
| &'[' (list | listcomp)
| &'{' (dict | set | dictcomp | setcomp)
| '...' { _PyAST_Constant(Py_Ellipsis, NULL, EXTRA) }
strings[expr_ty] (memo): a=STRING+ { _PyPegen_concatenate_strings(p, a) }
list[expr_ty]:
| '[' a=[star_named_expressions] ']' { _PyAST_List(a, Load, EXTRA) }
listcomp[expr_ty]:
| '[' a=named_expression b=for_if_clauses ']' { _PyAST_ListComp(a, b, EXTRA) }
| invalid_comprehension
tuple[expr_ty]:
| '(' a=[y=star_named_expression ',' z=[star_named_expressions] { _PyPegen_seq_insert_in_front(p, y, z) } ] ')' {
_PyAST_Tuple(a, Load, EXTRA) }
group[expr_ty]:
| '(' a=(yield_expr | named_expression) ')' { a }
| invalid_group
genexp[expr_ty]:
| '(' a=( assigment_expression | expression !':=') b=for_if_clauses ')' { _PyAST_GeneratorExp(a, b, EXTRA) }
| invalid_comprehension
set[expr_ty]: '{' a=star_named_expressions '}' { _PyAST_Set(a, EXTRA) }
setcomp[expr_ty]:
| '{' a=named_expression b=for_if_clauses '}' { _PyAST_SetComp(a, b, EXTRA) }
| invalid_comprehension
dict[expr_ty]:
| '{' a=[double_starred_kvpairs] '}' {
_PyAST_Dict(
CHECK(asdl_expr_seq*, _PyPegen_get_keys(p, a)),
CHECK(asdl_expr_seq*, _PyPegen_get_values(p, a)),
EXTRA) }
| '{' invalid_double_starred_kvpairs '}'
dictcomp[expr_ty]:
| '{' a=kvpair b=for_if_clauses '}' { _PyAST_DictComp(a->key, a->value, b, EXTRA) }
| invalid_dict_comprehension
double_starred_kvpairs[asdl_seq*]: a=','.double_starred_kvpair+ [','] { a }
double_starred_kvpair[KeyValuePair*]:
| '**' a=bitwise_or { _PyPegen_key_value_pair(p, NULL, a) }
| kvpair
kvpair[KeyValuePair*]: a=expression ':' b=expression { _PyPegen_key_value_pair(p, a, b) }
for_if_clauses[asdl_comprehension_seq*]:
| a[asdl_comprehension_seq*]=for_if_clause+ { a }
for_if_clause[comprehension_ty]:
| ASYNC 'for' a=star_targets 'in' ~ b=disjunction c[asdl_expr_seq*]=('if' z=disjunction { z })* {
CHECK_VERSION(comprehension_ty, 6, "Async comprehensions are", _PyAST_comprehension(a, b, c, 1, p->arena)) }
| 'for' a=star_targets 'in' ~ b=disjunction c[asdl_expr_seq*]=('if' z=disjunction { z })* {
_PyAST_comprehension(a, b, c, 0, p->arena) }
| invalid_for_target
yield_expr[expr_ty]:
| 'yield' 'from' a=expression { _PyAST_YieldFrom(a, EXTRA) }
| 'yield' a=[star_expressions] { _PyAST_Yield(a, EXTRA) }
arguments[expr_ty] (memo):
| a=args [','] &')' { a }
| invalid_arguments
args[expr_ty]:
| a[asdl_expr_seq*]=','.(starred_expression | ( assigment_expression | expression !':=') !'=')+ b=[',' k=kwargs {k}] {
_PyPegen_collect_call_seqs(p, a, b, EXTRA) }
| a=kwargs { _PyAST_Call(_PyPegen_dummy_name(p),
CHECK_NULL_ALLOWED(asdl_expr_seq*, _PyPegen_seq_extract_starred_exprs(p, a)),
CHECK_NULL_ALLOWED(asdl_keyword_seq*, _PyPegen_seq_delete_starred_exprs(p, a)),
EXTRA) }
kwargs[asdl_seq*]:
| a=','.kwarg_or_starred+ ',' b=','.kwarg_or_double_starred+ { _PyPegen_join_sequences(p, a, b) }
| ','.kwarg_or_starred+
| ','.kwarg_or_double_starred+
starred_expression[expr_ty]:
| '*' a=expression { _PyAST_Starred(a, Load, EXTRA) }
kwarg_or_starred[KeywordOrStarred*]:
| invalid_kwarg
| a=NAME '=' b=expression {
_PyPegen_keyword_or_starred(p, CHECK(keyword_ty, _PyAST_keyword(a->v.Name.id, b, EXTRA)), 1) }
| a=starred_expression { _PyPegen_keyword_or_starred(p, a, 0) }
kwarg_or_double_starred[KeywordOrStarred*]:
| invalid_kwarg
| a=NAME '=' b=expression {
_PyPegen_keyword_or_starred(p, CHECK(keyword_ty, _PyAST_keyword(a->v.Name.id, b, EXTRA)), 1) }
| '**' a=expression { _PyPegen_keyword_or_starred(p, CHECK(keyword_ty, _PyAST_keyword(NULL, a, EXTRA)), 1) }
# NOTE: star_targets may contain *bitwise_or, targets may not.
star_targets[expr_ty]:
| a=star_target !',' { a }
| a=star_target b=(',' c=star_target { c })* [','] {
_PyAST_Tuple(CHECK(asdl_expr_seq*, _PyPegen_seq_insert_in_front(p, a, b)), Store, EXTRA) }
star_targets_list_seq[asdl_expr_seq*]: a[asdl_expr_seq*]=','.star_target+ [','] { a }
star_targets_tuple_seq[asdl_expr_seq*]:
| a=star_target b=(',' c=star_target { c })+ [','] { (asdl_expr_seq*) _PyPegen_seq_insert_in_front(p, a, b) }
| a=star_target ',' { (asdl_expr_seq*) _PyPegen_singleton_seq(p, a) }
star_target[expr_ty] (memo):
| '*' a=(!'*' star_target) {
_PyAST_Starred(CHECK(expr_ty, _PyPegen_set_expr_context(p, a, Store)), Store, EXTRA) }
| target_with_star_atom
target_with_star_atom[expr_ty] (memo):
| a=t_primary '.' b=NAME !t_lookahead { _PyAST_Attribute(a, b->v.Name.id, Store, EXTRA) }
| a=t_primary '[' b=slices ']' !t_lookahead { _PyAST_Subscript(a, b, Store, EXTRA) }
| star_atom
star_atom[expr_ty]:
| a=NAME { _PyPegen_set_expr_context(p, a, Store) }
| '(' a=target_with_star_atom ')' { _PyPegen_set_expr_context(p, a, Store) }
| '(' a=[star_targets_tuple_seq] ')' { _PyAST_Tuple(a, Store, EXTRA) }
| '[' a=[star_targets_list_seq] ']' { _PyAST_List(a, Store, EXTRA) }
single_target[expr_ty]:
| single_subscript_attribute_target
| a=NAME { _PyPegen_set_expr_context(p, a, Store) }
| '(' a=single_target ')' { a }
single_subscript_attribute_target[expr_ty]:
| a=t_primary '.' b=NAME !t_lookahead { _PyAST_Attribute(a, b->v.Name.id, Store, EXTRA) }
| a=t_primary '[' b=slices ']' !t_lookahead { _PyAST_Subscript(a, b, Store, EXTRA) }
del_targets[asdl_expr_seq*]: a[asdl_expr_seq*]=','.del_target+ [','] { a }
del_target[expr_ty] (memo):
| a=t_primary '.' b=NAME !t_lookahead { _PyAST_Attribute(a, b->v.Name.id, Del, EXTRA) }
| a=t_primary '[' b=slices ']' !t_lookahead { _PyAST_Subscript(a, b, Del, EXTRA) }
| del_t_atom
del_t_atom[expr_ty]:
| a=NAME { _PyPegen_set_expr_context(p, a, Del) }
| '(' a=del_target ')' { _PyPegen_set_expr_context(p, a, Del) }
| '(' a=[del_targets] ')' { _PyAST_Tuple(a, Del, EXTRA) }
| '[' a=[del_targets] ']' { _PyAST_List(a, Del, EXTRA) }
targets[asdl_expr_seq*]: a[asdl_expr_seq*]=','.target+ [','] { a }
target[expr_ty] (memo):
| a=t_primary '.' b=NAME !t_lookahead { _PyAST_Attribute(a, b->v.Name.id, Store, EXTRA) }
| a=t_primary '[' b=slices ']' !t_lookahead { _PyAST_Subscript(a, b, Store, EXTRA) }
| t_atom
t_primary[expr_ty]:
| a=t_primary '.' b=NAME &t_lookahead { _PyAST_Attribute(a, b->v.Name.id, Load, EXTRA) }
| a=t_primary '[' b=slices ']' &t_lookahead { _PyAST_Subscript(a, b, Load, EXTRA) }
| a=t_primary b=genexp &t_lookahead {
_PyAST_Call(a, CHECK(asdl_expr_seq*, (asdl_expr_seq*)_PyPegen_singleton_seq(p, b)), NULL, EXTRA) }
| a=t_primary '(' b=[arguments] ')' &t_lookahead {
_PyAST_Call(a,
(b) ? ((expr_ty) b)->v.Call.args : NULL,
(b) ? ((expr_ty) b)->v.Call.keywords : NULL,
EXTRA) }
| a=atom &t_lookahead { a }
t_lookahead: '(' | '[' | '.'
t_atom[expr_ty]:
| a=NAME { _PyPegen_set_expr_context(p, a, Store) }
| '(' a=target ')' { _PyPegen_set_expr_context(p, a, Store) }
| '(' b=[targets] ')' { _PyAST_Tuple(b, Store, EXTRA) }
| '[' b=[targets] ']' { _PyAST_List(b, Store, EXTRA) }
# From here on, there are rules for invalid syntax with specialised error messages
invalid_arguments:
| a=args ',' '*' { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "iterable argument unpacking follows keyword argument unpacking") }
| a=expression b=for_if_clauses ',' [args | expression for_if_clauses] {
RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, PyPegen_last_item(b, comprehension_ty)->target, "Generator expression must be parenthesized") }
| a=NAME b='=' expression for_if_clauses {
RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, b, "invalid syntax. Maybe you meant '==' or ':=' instead of '='?")}
| a=args for_if_clauses { _PyPegen_nonparen_genexp_in_call(p, a) }
| args ',' a=expression b=for_if_clauses {
RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, asdl_seq_GET(b, b->size-1)->target, "Generator expression must be parenthesized") }
| a=args ',' args { _PyPegen_arguments_parsing_error(p, a) }
invalid_kwarg:
| a=NAME b='=' expression for_if_clauses {
RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, b, "invalid syntax. Maybe you meant '==' or ':=' instead of '='?")}
| !(NAME '=') a=expression b='=' {
RAISE_SYNTAX_ERROR_KNOWN_RANGE(
a, b, "expression cannot contain assignment, perhaps you meant \"==\"?") }
expression_without_invalid[expr_ty]:
| a=disjunction 'if' b=disjunction 'else' c=expression { _PyAST_IfExp(b, a, c, EXTRA) }
| disjunction
| lambdef
invalid_expression:
# !(NAME STRING) is not matched so we don't show this error with some invalid string prefixes like: kf"dsfsdf"
# Soft keywords need to also be ignored because they can be parsed as NAME NAME
| !(NAME STRING | SOFT_KEYWORD) a=disjunction b=expression_without_invalid {
RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, b, "invalid syntax. Perhaps you forgot a comma?") }
invalid_named_expression:
| a=expression ':=' expression {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(
a, "cannot use assignment expressions with %s", _PyPegen_get_expr_name(a)) }
| a=NAME '=' b=bitwise_or !('='|':=') {
p->in_raw_rule ? NULL : RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, b, "invalid syntax. Maybe you meant '==' or ':=' instead of '='?") }
| !(list|tuple|genexp|'True'|'None'|'False') a=bitwise_or b='=' bitwise_or !('='|':=') {
p->in_raw_rule ? NULL : RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "cannot assign to %s here. Maybe you meant '==' instead of '='?",
_PyPegen_get_expr_name(a)) }
invalid_assignment:
| a=invalid_ann_assign_target ':' expression {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(
a,
"only single target (not %s) can be annotated",
_PyPegen_get_expr_name(a)
)}
| a=star_named_expression ',' star_named_expressions* ':' expression {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "only single target (not tuple) can be annotated") }
| a=expression ':' expression {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "illegal target for annotation") }
| (star_targets '=')* a=star_expressions '=' {
RAISE_SYNTAX_ERROR_INVALID_TARGET(STAR_TARGETS, a) }
| (star_targets '=')* a=yield_expr '=' { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "assignment to yield expression not possible") }
| a=star_expressions augassign (yield_expr | star_expressions) {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(
a,
"'%s' is an illegal expression for augmented assignment",
_PyPegen_get_expr_name(a)
)}
invalid_ann_assign_target[expr_ty]:
| list
| tuple
| '(' a=invalid_ann_assign_target ')' { a }
invalid_del_stmt:
| 'del' a=star_expressions {
RAISE_SYNTAX_ERROR_INVALID_TARGET(DEL_TARGETS, a) }
invalid_block:
| NEWLINE !INDENT { RAISE_INDENTATION_ERROR("expected an indented block") }
invalid_primary:
| primary a='{' { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "invalid syntax") }
invalid_comprehension:
| ('[' | '(' | '{') a=starred_expression for_if_clauses {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "iterable unpacking cannot be used in comprehension") }
| ('[' | '{') a=star_named_expression ',' b=star_named_expressions for_if_clauses {
RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, PyPegen_last_item(b, expr_ty),
"did you forget parentheses around the comprehension target?") }
| ('[' | '{') a=star_named_expression b=',' for_if_clauses {
RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, b, "did you forget parentheses around the comprehension target?") }
invalid_dict_comprehension:
| '{' a='**' bitwise_or for_if_clauses '}' {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "dict unpacking cannot be used in dict comprehension") }
invalid_parameters:
| param_no_default* invalid_parameters_helper a=param_no_default {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "non-default argument follows default argument") }
invalid_parameters_helper: # This is only there to avoid type errors
| a=slash_with_default { _PyPegen_singleton_seq(p, a) }
| param_with_default+
invalid_lambda_parameters:
| lambda_param_no_default* invalid_lambda_parameters_helper a=lambda_param_no_default {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "non-default argument follows default argument") }
invalid_lambda_parameters_helper:
| a=lambda_slash_with_default { _PyPegen_singleton_seq(p, a) }
| lambda_param_with_default+
invalid_star_etc:
| a='*' (')' | ',' (')' | '**')) { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "named arguments must follow bare *") }
| '*' ',' TYPE_COMMENT { RAISE_SYNTAX_ERROR("bare * has associated type comment") }
invalid_lambda_star_etc:
| '*' (':' | ',' (':' | '**')) { RAISE_SYNTAX_ERROR("named arguments must follow bare *") }
invalid_double_type_comments:
| TYPE_COMMENT NEWLINE TYPE_COMMENT NEWLINE INDENT {
RAISE_SYNTAX_ERROR("Cannot have two type comments on def") }
invalid_with_item:
| expression 'as' a=expression &(',' | ')' | ':') {
RAISE_SYNTAX_ERROR_INVALID_TARGET(STAR_TARGETS, a) }
invalid_for_target:
| ASYNC? 'for' a=star_expressions {
RAISE_SYNTAX_ERROR_INVALID_TARGET(FOR_TARGETS, a) }
invalid_group:
| '(' a=starred_expression ')' {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "cannot use starred expression here") }
| '(' a='**' expression ')' {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "cannot use double starred expression here") }
invalid_import_from_targets:
| import_from_as_names ',' {
RAISE_SYNTAX_ERROR("trailing comma not allowed without surrounding parentheses") }
invalid_with_stmt:
| [ASYNC] 'with' ','.(expression ['as' star_target])+ &&':'
| [ASYNC] 'with' '(' ','.(expressions ['as' star_target])+ ','? ')' &&':'
invalid_with_stmt_indent:
| [ASYNC] a='with' ','.(expression ['as' star_target])+ ':' NEWLINE !INDENT {
RAISE_INDENTATION_ERROR("expected an indented block after 'with' statement on line %d", a->lineno) }
| [ASYNC] a='with' '(' ','.(expressions ['as' star_target])+ ','? ')' ':' NEWLINE !INDENT {
RAISE_INDENTATION_ERROR("expected an indented block after 'with' statement on line %d", a->lineno) }
invalid_try_stmt:
| a='try' ':' NEWLINE !INDENT {
RAISE_INDENTATION_ERROR("expected an indented block after 'try' statement on line %d", a->lineno) }
invalid_except_stmt:
| 'except' a=expression ',' expressions ['as' NAME ] ':' {
RAISE_SYNTAX_ERROR_STARTING_FROM(a, "multiple exception types must be parenthesized") }
| a='except' expression ['as' NAME ] NEWLINE { RAISE_SYNTAX_ERROR("expected ':'") }
| a='except' NEWLINE { RAISE_SYNTAX_ERROR("expected ':'") }
invalid_finally_stmt:
| a='finally' ':' NEWLINE !INDENT {
RAISE_INDENTATION_ERROR("expected an indented block after 'finally' statement on line %d", a->lineno) }
invalid_except_stmt_indent:
| a='except' expression ['as' NAME ] ':' NEWLINE !INDENT {
RAISE_INDENTATION_ERROR("expected an indented block after 'except' statement on line %d", a->lineno) }
| a='except' ':' NEWLINE !INDENT { RAISE_SYNTAX_ERROR("expected an indented block after except statement on line %d", a->lineno) }
invalid_match_stmt:
| "match" subject_expr !':' { CHECK_VERSION(void*, 10, "Pattern matching is", RAISE_SYNTAX_ERROR("expected ':'") ) }
| a="match" subject=subject_expr ':' NEWLINE !INDENT {
RAISE_INDENTATION_ERROR("expected an indented block after 'match' statement on line %d", a->lineno) }
invalid_case_block:
| "case" patterns guard? !':' { RAISE_SYNTAX_ERROR("expected ':'") }
| a="case" patterns guard? ':' NEWLINE !INDENT {
RAISE_INDENTATION_ERROR("expected an indented block after 'case' statement on line %d", a->lineno) }
invalid_if_stmt:
| 'if' named_expression NEWLINE { RAISE_SYNTAX_ERROR("expected ':'") }
| a='if' a=named_expression ':' NEWLINE !INDENT {
RAISE_INDENTATION_ERROR("expected an indented block after 'if' statement on line %d", a->lineno) }
invalid_elif_stmt:
| 'elif' named_expression NEWLINE { RAISE_SYNTAX_ERROR("expected ':'") }
| a='elif' named_expression ':' NEWLINE !INDENT {
RAISE_INDENTATION_ERROR("expected an indented block after 'elif' statement on line %d", a->lineno) }
invalid_else_stmt:
| a='else' ':' NEWLINE !INDENT {
RAISE_INDENTATION_ERROR("expected an indented block after 'else' statement on line %d", a->lineno) }
invalid_while_stmt:
| 'while' named_expression NEWLINE { RAISE_SYNTAX_ERROR("expected ':'") }
| a='while' named_expression ':' NEWLINE !INDENT {
RAISE_INDENTATION_ERROR("expected an indented block after 'while' statement on line %d", a->lineno) }
invalid_for_stmt:
| [ASYNC] a='for' star_targets 'in' star_expressions ':' NEWLINE !INDENT {
RAISE_INDENTATION_ERROR("expected an indented block after 'for' statement on line %d", a->lineno) }
invalid_def_raw:
| [ASYNC] a='def' NAME '(' [params] ')' ['->' expression] ':' NEWLINE !INDENT {
RAISE_INDENTATION_ERROR("expected an indented block after function definition on line %d", a->lineno) }
invalid_class_def_raw:
| a='class' NAME ['('[arguments] ')'] ':' NEWLINE !INDENT {
RAISE_INDENTATION_ERROR("expected an indented block after class definition on line %d", a->lineno) }
invalid_double_starred_kvpairs:
| ','.double_starred_kvpair+ ',' invalid_kvpair
| expression ':' a='*' bitwise_or { RAISE_SYNTAX_ERROR_STARTING_FROM(a, "cannot use a starred expression in a dictionary value") }
| expression a=':' &('}'|',') { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "expression expected after dictionary key and ':'") }
invalid_kvpair:
| a=expression !(':') {
RAISE_ERROR_KNOWN_LOCATION(p, PyExc_SyntaxError, a->lineno, a->end_col_offset - 1, a->end_lineno, -1, "':' expected after dictionary key") }
| expression ':' a='*' bitwise_or { RAISE_SYNTAX_ERROR_STARTING_FROM(a, "cannot use a starred expression in a dictionary value") }
| expression a=':' {RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "expression expected after dictionary key and ':'") }
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