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bpo-43892: Make match patterns explicit in the AST (GH-25585)

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Co-authored-by: Brandt Bucher <brandtbucher@gmail.com>
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Nick Coghlan 2021-04-29 15:58:44 +10:00 • committed by GitHub
parent e52ab42ced
commit 1e7b858575
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20 changed files with 3460 additions and 1377 deletions
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Parser/Python.asdl
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@ -89,10 +89,6 @@ 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)
@ -128,7 +124,21 @@ module Python
withitem = (expr context_expr, expr? optional_vars)
match_case = (expr pattern, expr? guard, stmt* body)
match_case = (pattern pattern, expr? guard, stmt* body)
pattern = MatchValue(expr value)
| MatchSingleton(constant value)
| MatchSequence(pattern* patterns)
| MatchMapping(expr* keys, pattern* patterns, identifier? rest)
| MatchClass(expr cls, pattern* patterns, identifier* kwd_attrs, pattern* kwd_patterns)
| MatchStar(identifier? name)
-- The optional "rest" MatchMapping parameter handles capturing extra mapping keys
| MatchAs(pattern? pattern, identifier? name)
| MatchOr(pattern* patterns)
attributes (int lineno, int col_offset, int end_lineno, int end_col_offset)
type_ignore = TypeIgnore(int lineno, string tag)
}