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bpo-42128: Add 'missing :' syntax error message to match statements (GH-24733)

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Pablo Galindo 2021-03-18 01:03:11 +00:00 • committed by GitHub
parent 526fdeb227
commit 08fb8ac99a
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3 changed files with 368 additions and 184 deletions
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@ -211,6 +211,7 @@ finally_block[asdl_stmt_seq*]: '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", _Py_Match(subject, cases, EXTRA)) }
| invalid_match_stmt
subject_expr[expr_ty]:
| value=star_named_expression ',' values=star_named_expressions? {
_Py_Tuple(CHECK(asdl_expr_seq*, _PyPegen_seq_insert_in_front(p, value, values)), Load, EXTRA) }
@ -218,6 +219,7 @@ subject_expr[expr_ty]:
case_block[match_case_ty]:
| "case" pattern=patterns guard=guard? ':' body=block {
_Py_match_case(pattern, guard, body, p->arena) }
| invalid_case_block
guard[expr_ty]: 'if' guard=named_expression { guard }
patterns[expr_ty]:
@ -853,3 +855,9 @@ invalid_except_block:
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "exception group must be parenthesized") }
| 'except' expression ['as' NAME ] &&':'
| 'except' &&':'
invalid_match_stmt:
| "match" subject_expr !':' { CHECK_VERSION(void*, 10, "Pattern matching is", RAISE_SYNTAX_ERROR("expected ':'") ) }
invalid_case_block:
| "case" patterns guard? !':' { RAISE_SYNTAX_ERROR("expected ':'") }