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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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27
Lib/ast.py
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@ -1478,6 +1478,13 @@ class _Unparser(NodeVisitor):
self.write(":")
self.traverse(node.step)
def visit_Match(self, node):
self.fill("match ")
self.traverse(node.subject)
with self.block():
for case in node.cases:
self.traverse(case)
def visit_arg(self, node):
self.write(node.arg)
if node.annotation:
@ -1562,6 +1569,26 @@ class _Unparser(NodeVisitor):
self.write(" as ")
self.traverse(node.optional_vars)
def visit_match_case(self, node):
self.fill("case ")
self.traverse(node.pattern)
if node.guard:
self.write(" if ")
self.traverse(node.guard)
with self.block():
self.traverse(node.body)
def visit_MatchAs(self, node):
with self.require_parens(_Precedence.TEST, node):
self.set_precedence(_Precedence.BOR, node.pattern)
self.traverse(node.pattern)
self.write(f" as {node.name}")
def visit_MatchOr(self, node):
with self.require_parens(_Precedence.BOR, node):
self.set_precedence(_Precedence.BOR.next(), *node.patterns)
self.interleave(lambda: self.write(" | "), self.traverse, node.patterns)
def unparse(ast_obj):
unparser = _Unparser()
return unparser.visit(ast_obj)