bpo-42128: Structural Pattern Matching (PEP 634) (GH-22917)

Co-authored-by: Guido van Rossum <guido@python.org>
Co-authored-by: Talin <viridia@gmail.com>
Co-authored-by: Pablo Galindo <pablogsal@gmail.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/Parser/Python.asdl b/Parser/Python.asdl
index 889712b4b3..ddc019da48 100644
--- a/Parser/Python.asdl
+++ b/Parser/Python.asdl
@@ -36,6 +36,8 @@ module Python
           | With(withitem* items, stmt* body, string? type_comment)
           | AsyncWith(withitem* items, stmt* body, string? type_comment)
 
+          | Match(expr subject, match_case* cases)
+
           | Raise(expr? exc, expr? cause)
           | Try(stmt* body, excepthandler* handlers, stmt* orelse, stmt* finalbody)
           | Assert(expr test, expr? msg)
@@ -87,6 +89,10 @@ module Python
          -- can appear only in Subscript
          | Slice(expr? lower, expr? upper, expr? step)
 
+         -- only used in patterns
+         | MatchAs(expr pattern, identifier name)
+         | MatchOr(expr* patterns)
+
           -- col_offset is the byte offset in the utf8 string the parser uses
           attributes (int lineno, int col_offset, int? end_lineno, int? end_col_offset)
 
@@ -121,5 +127,7 @@ module Python
 
     withitem = (expr context_expr, expr? optional_vars)
 
+    match_case = (expr pattern, expr? guard, stmt* body)
+
     type_ignore = TypeIgnore(int lineno, string tag)
 }