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

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Co-authored-by: Guido van Rossum <guido@python.org>
Co-authored-by: Talin <viridia@gmail.com>
Co-authored-by: Pablo Galindo <pablogsal@gmail.com>
This commit is contained in:
Brandt Bucher 2021-02-26 14:51:55 -08:00 • committed by GitHub
parent cc02b4f2e8
commit 145bf269df
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43 changed files with 10867 additions and 2607 deletions
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29
Python/ast.c
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@ -309,6 +309,14 @@ validate_expr(expr_ty exp, expr_context_ty ctx)
return validate_exprs(exp->v.Tuple.elts, ctx, 0);
case NamedExpr_kind:
return validate_expr(exp->v.NamedExpr.value, Load);
case MatchAs_kind:
PyErr_SetString(PyExc_ValueError,
"MatchAs is only valid in match_case patterns");
return 0;
case MatchOr_kind:
PyErr_SetString(PyExc_ValueError,
"MatchOr is only valid in match_case patterns");
return 0;
/* This last case doesn't have any checking. */
case Name_kind:
return 1;
@ -317,6 +325,13 @@ validate_expr(expr_ty exp, expr_context_ty ctx)
return 0;
}
static int
validate_pattern(expr_ty p)
{
// Coming soon (thanks Batuhan)!
return 1;
}
static int
_validate_nonempty_seq(asdl_seq *seq, const char *what, const char *owner)
{
@ -415,6 +430,20 @@ validate_stmt(stmt_ty stmt)
return 0;
}
return validate_body(stmt->v.AsyncWith.body, "AsyncWith");
case Match_kind:
if (!validate_expr(stmt->v.Match.subject, Load)
|| !validate_nonempty_seq(stmt->v.Match.cases, "cases", "Match")) {
return 0;
}
for (i = 0; i < asdl_seq_LEN(stmt->v.Match.cases); i++) {
match_case_ty m = asdl_seq_GET(stmt->v.Match.cases, i);
if (!validate_pattern(m->pattern)
|| (m->guard && !validate_expr(m->guard, Load))
|| !validate_body(m->body, "match_case")) {
return 0;
}
}
return 1;
case Raise_kind:
if (stmt->v.Raise.exc) {
return validate_expr(stmt->v.Raise.exc, Load) &&