mirror of https://github.com/python/cpython
bpo-46838: Syntax error improvements for function definitions (GH-31590)
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@ -306,14 +306,16 @@ slash_with_default[SlashWithDefault*]:
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| a=param_no_default* b=param_with_default+ '/' &')' { _PyPegen_slash_with_default(p, (asdl_arg_seq *)a, b) }
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star_etc[StarEtc*]:
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| invalid_star_etc
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| '*' a=param_no_default b=param_maybe_default* c=[kwds] {
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_PyPegen_star_etc(p, a, b, c) }
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| '*' ',' b=param_maybe_default+ c=[kwds] {
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_PyPegen_star_etc(p, NULL, b, c) }
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| a=kwds { _PyPegen_star_etc(p, NULL, NULL, a) }
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| invalid_star_etc
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kwds[arg_ty]: '**' a=param_no_default { a }
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kwds[arg_ty]:
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| invalid_kwds
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| '**' a=param_no_default { a }
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# One parameter. This *includes* a following comma and type comment.
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#
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@ -339,7 +341,7 @@ param_maybe_default[NameDefaultPair*]:
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| a=param c=default? tc=TYPE_COMMENT? &')' { _PyPegen_name_default_pair(p, a, c, tc) }
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param[arg_ty]: a=NAME b=annotation? { _PyAST_arg(a->v.Name.id, b, NULL, EXTRA) }
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annotation[expr_ty]: ':' a=expression { a }
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default[expr_ty]: '=' a=expression { a }
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default[expr_ty]: '=' a=expression { a } | invalid_default
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# If statement
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# ------------
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@ -836,14 +838,16 @@ lambda_slash_with_default[SlashWithDefault*]:
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| a=lambda_param_no_default* b=lambda_param_with_default+ '/' &':' { _PyPegen_slash_with_default(p, (asdl_arg_seq *)a, b) }
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lambda_star_etc[StarEtc*]:
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| invalid_lambda_star_etc
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| '*' a=lambda_param_no_default b=lambda_param_maybe_default* c=[lambda_kwds] {
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_PyPegen_star_etc(p, a, b, c) }
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| '*' ',' b=lambda_param_maybe_default+ c=[lambda_kwds] {
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_PyPegen_star_etc(p, NULL, b, c) }
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| a=lambda_kwds { _PyPegen_star_etc(p, NULL, NULL, a) }
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| invalid_lambda_star_etc
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lambda_kwds[arg_ty]: '**' a=lambda_param_no_default { a }
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lambda_kwds[arg_ty]:
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| invalid_lambda_kwds
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| '**' a=lambda_param_no_default { a }
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lambda_param_no_default[arg_ty]:
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| a=lambda_param ',' { a }
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@ -1151,6 +1155,26 @@ invalid_parameters:
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RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "non-default argument follows default argument") }
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| param_no_default* a='(' param_no_default+ ','? b=')' {
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RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, b, "Function parameters cannot be parenthesized") }
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| a="/" ',' {
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RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "at least one argument must precede /") }
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| (slash_no_default | slash_with_default) param_maybe_default* a='/' {
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RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "/ may appear only once") }
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| (slash_no_default | slash_with_default)? param_maybe_default* '*' (',' | param_no_default) param_maybe_default* a='/' {
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RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "/ must be ahead of *") }
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| param_maybe_default+ '/' a='*' {
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RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "expected comma between / and *") }
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invalid_default:
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| a='=' &(')'|',') { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "expected default value expression") }
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invalid_star_etc:
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| a='*' (')' | ',' (')' | '**')) { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "named arguments must follow bare *") }
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| '*' ',' TYPE_COMMENT { RAISE_SYNTAX_ERROR("bare * has associated type comment") }
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| '*' param a='=' { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "var-positional argument cannot have default value") }
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| '*' (param_no_default | ',') param_maybe_default* a='*' (param_no_default | ',') {
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RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "* argument may appear only once") }
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invalid_kwds:
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| '**' param a='=' { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "var-keyword argument cannot have default value") }
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| '**' param ',' a=param { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "arguments cannot follow var-keyword argument") }
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| '**' param ',' a[Token*]=('*'|'**'|'/') { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "arguments cannot follow var-keyword argument") }
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invalid_parameters_helper: # This is only there to avoid type errors
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| a=slash_with_default { _PyPegen_singleton_seq(p, a) }
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| param_with_default+
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@ -1159,14 +1183,26 @@ invalid_lambda_parameters:
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RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "non-default argument follows default argument") }
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| lambda_param_no_default* a='(' ','.lambda_param+ ','? b=')' {
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RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, b, "Lambda expression parameters cannot be parenthesized") }
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| a="/" ',' {
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RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "at least one argument must precede /") }
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| (lambda_slash_no_default | lambda_slash_with_default) lambda_param_maybe_default* a='/' {
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RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "/ may appear only once") }
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| (lambda_slash_no_default | lambda_slash_with_default)? lambda_param_maybe_default* '*' (',' | lambda_param_no_default) lambda_param_maybe_default* a='/' {
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RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "/ must be ahead of *") }
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| lambda_param_maybe_default+ '/' a='*' {
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RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "expected comma between / and *") }
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invalid_lambda_parameters_helper:
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| a=lambda_slash_with_default { _PyPegen_singleton_seq(p, a) }
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| lambda_param_with_default+
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invalid_star_etc:
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| a='*' (')' | ',' (')' | '**')) { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "named arguments must follow bare *") }
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| '*' ',' TYPE_COMMENT { RAISE_SYNTAX_ERROR("bare * has associated type comment") }
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invalid_lambda_star_etc:
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| '*' (':' | ',' (':' | '**')) { RAISE_SYNTAX_ERROR("named arguments must follow bare *") }
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| '*' lambda_param a='=' { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "var-positional argument cannot have default value") }
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| '*' (lambda_param_no_default | ',') lambda_param_maybe_default* a='*' (lambda_param_no_default | ',') {
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RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "* argument may appear only once") }
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invalid_lambda_kwds:
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| '**' lambda_param a='=' { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "var-keyword argument cannot have default value") }
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| '**' lambda_param ',' a=lambda_param { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "arguments cannot follow var-keyword argument") }
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| '**' lambda_param ',' a[Token*]=('*'|'**'|'/') { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "arguments cannot follow var-keyword argument") }
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invalid_double_type_comments:
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| TYPE_COMMENT NEWLINE TYPE_COMMENT NEWLINE INDENT {
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RAISE_SYNTAX_ERROR("Cannot have two type comments on def") }
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@ -1269,4 +1305,4 @@ invalid_kvpair:
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| a=expression !(':') {
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RAISE_ERROR_KNOWN_LOCATION(p, PyExc_SyntaxError, a->lineno, a->end_col_offset - 1, a->end_lineno, -1, "':' expected after dictionary key") }
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| expression ':' a='*' bitwise_or { RAISE_SYNTAX_ERROR_STARTING_FROM(a, "cannot use a starred expression in a dictionary value") }
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| expression a=':' {RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "expression expected after dictionary key and ':'") }
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| expression a=':' {RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "expression expected after dictionary key and ':'") }
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@ -351,6 +351,210 @@ SyntaxError: invalid syntax
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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>>> def foo(/,a,b=,c):
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... pass
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Traceback (most recent call last):
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SyntaxError: at least one argument must precede /
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>>> def foo(a,/,/,b,c):
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... pass
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Traceback (most recent call last):
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SyntaxError: / may appear only once
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>>> def foo(a,/,a1,/,b,c):
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... pass
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Traceback (most recent call last):
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SyntaxError: / may appear only once
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>>> def foo(a=1,/,/,*b,/,c):
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... pass
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Traceback (most recent call last):
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SyntaxError: / may appear only once
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>>> def foo(a,/,a1=1,/,b,c):
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... pass
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Traceback (most recent call last):
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SyntaxError: / may appear only once
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>>> def foo(a,*b,c,/,d,e):
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... pass
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Traceback (most recent call last):
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SyntaxError: / must be ahead of *
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>>> def foo(a=1,*b,c=3,/,d,e):
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... pass
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Traceback (most recent call last):
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SyntaxError: / must be ahead of *
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>>> def foo(a,*b=3,c):
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... pass
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Traceback (most recent call last):
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SyntaxError: var-positional argument cannot have default value
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>>> def foo(a,*b: int=,c):
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... pass
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Traceback (most recent call last):
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SyntaxError: var-positional argument cannot have default value
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>>> def foo(a,**b=3):
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... pass
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Traceback (most recent call last):
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SyntaxError: var-keyword argument cannot have default value
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>>> def foo(a,**b: int=3):
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... pass
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Traceback (most recent call last):
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SyntaxError: var-keyword argument cannot have default value
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>>> def foo(a,*a, b, **c, d):
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... pass
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Traceback (most recent call last):
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SyntaxError: arguments cannot follow var-keyword argument
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>>> def foo(a,*a, b, **c, d=4):
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... pass
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Traceback (most recent call last):
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SyntaxError: arguments cannot follow var-keyword argument
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>>> def foo(a,*a, b, **c, *d):
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... pass
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Traceback (most recent call last):
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SyntaxError: arguments cannot follow var-keyword argument
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>>> def foo(a,*a, b, **c, **d):
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... pass
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Traceback (most recent call last):
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SyntaxError: arguments cannot follow var-keyword argument
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>>> def foo(a=1,/,**b,/,c):
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... pass
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Traceback (most recent call last):
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SyntaxError: arguments cannot follow var-keyword argument
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>>> def foo(*b,*d):
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... pass
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Traceback (most recent call last):
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SyntaxError: * argument may appear only once
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>>> def foo(a,*b,c,*d,*e,c):
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... pass
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Traceback (most recent call last):
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SyntaxError: * argument may appear only once
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>>> def foo(a,b,/,c,*b,c,*d,*e,c):
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... pass
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Traceback (most recent call last):
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SyntaxError: * argument may appear only once
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>>> def foo(a,b,/,c,*b,c,*d,**e):
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... pass
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Traceback (most recent call last):
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SyntaxError: * argument may appear only once
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>>> def foo(a=1,/*,b,c):
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... pass
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Traceback (most recent call last):
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SyntaxError: expected comma between / and *
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>>> def foo(a=1,d=,c):
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... pass
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Traceback (most recent call last):
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SyntaxError: expected default value expression
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>>> def foo(a,d=,c):
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... pass
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Traceback (most recent call last):
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SyntaxError: expected default value expression
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>>> def foo(a,d: int=,c):
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... pass
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Traceback (most recent call last):
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SyntaxError: expected default value expression
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>>> lambda /,a,b,c: None
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Traceback (most recent call last):
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SyntaxError: at least one argument must precede /
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>>> lambda a,/,/,b,c: None
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Traceback (most recent call last):
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SyntaxError: / may appear only once
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>>> lambda a,/,a1,/,b,c: None
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Traceback (most recent call last):
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SyntaxError: / may appear only once
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>>> lambda a=1,/,/,*b,/,c: None
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Traceback (most recent call last):
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SyntaxError: / may appear only once
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>>> lambda a,/,a1=1,/,b,c: None
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Traceback (most recent call last):
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SyntaxError: / may appear only once
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>>> lambda a,*b,c,/,d,e: None
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Traceback (most recent call last):
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SyntaxError: / must be ahead of *
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>>> lambda a=1,*b,c=3,/,d,e: None
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Traceback (most recent call last):
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SyntaxError: / must be ahead of *
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>>> lambda a=1,/*,b,c: None
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Traceback (most recent call last):
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SyntaxError: expected comma between / and *
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>>> lambda a,*b=3,c: None
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Traceback (most recent call last):
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SyntaxError: var-positional argument cannot have default value
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>>> lambda a,**b=3: None
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Traceback (most recent call last):
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SyntaxError: var-keyword argument cannot have default value
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>>> lambda a, *a, b, **c, d: None
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Traceback (most recent call last):
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SyntaxError: arguments cannot follow var-keyword argument
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>>> lambda a,*a, b, **c, d=4: None
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Traceback (most recent call last):
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SyntaxError: arguments cannot follow var-keyword argument
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>>> lambda a,*a, b, **c, *d: None
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Traceback (most recent call last):
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SyntaxError: arguments cannot follow var-keyword argument
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>>> lambda a,*a, b, **c, **d: None
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Traceback (most recent call last):
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SyntaxError: arguments cannot follow var-keyword argument
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>>> lambda a=1,/,**b,/,c: None
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Traceback (most recent call last):
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SyntaxError: arguments cannot follow var-keyword argument
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>>> lambda *b,*d: None
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Traceback (most recent call last):
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SyntaxError: * argument may appear only once
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>>> lambda a,*b,c,*d,*e,c: None
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Traceback (most recent call last):
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SyntaxError: * argument may appear only once
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>>> lambda a,b,/,c,*b,c,*d,*e,c: None
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Traceback (most recent call last):
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SyntaxError: * argument may appear only once
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>>> lambda a,b,/,c,*b,c,*d,**e: None
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Traceback (most recent call last):
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SyntaxError: * argument may appear only once
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>>> lambda a=1,d=,c: None
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Traceback (most recent call last):
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SyntaxError: expected default value expression
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>>> lambda a,d=,c: None
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Traceback (most recent call last):
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SyntaxError: expected default value expression
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>>> import ast; ast.parse('''
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... def f(
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... *, # type: int
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@ -0,0 +1,2 @@
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Improve syntax errors for incorrect function definitions. Patch by Pablo
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Galindo
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