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Handling of star_expr and some async issues.

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This commit is contained in:
Dave Halter
2017-07-21 17:23:16 +02:00
parent 82d69ca211
commit 1df06025c2
3 changed files with 37 additions and 2 deletions
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27
parso/python/normalizer.py
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@@ -3,6 +3,7 @@ from contextlib import contextmanager
from parso.normalizer import Normalizer, NormalizerConfig, Issue
_BLOCK_STMTS = ('if_stmt', 'while_stmt', 'for_stmt', 'try_stmt', 'with_stmt')
_STAR_EXPR_PARENTS = ('testlist_star_expr', 'testlist_comp', 'exprlist')
# This is the maximal block size given by python.
_MAX_BLOCK_SIZE = 20
@@ -95,6 +96,24 @@ class ErrorFinder(Normalizer):
and is_future_import(node):
message = "from __future__ imports must occur at the beginning of the file"
self._add_syntax_error(message, node)
elif node.type in _STAR_EXPR_PARENTS:
if node.parent.type == 'del_stmt':
self._add_syntax_error("can't use starred expression here", node.parent)
else:
starred = [c for c in node.children if c.type == 'star_expr']
if len(starred) > 1:
message = "two starred expressions in assignment"
self._add_syntax_error(message, starred[1])
"can't use starred expression here"
elif node.type == 'star_expr':
if node.parent.type not in _STAR_EXPR_PARENTS:
message = "starred assignment target must be in a list or tuple"
self._add_syntax_error(message, node)
elif node.type == 'comp_for':
if node.children[0] == 'async' \
and not self._context.is_async_funcdef():
message = "asynchronous comprehension outside of an asynchronous function"
self._add_syntax_error(message, node)
yield
@@ -134,10 +153,14 @@ class ErrorFinder(Normalizer):
self._add_syntax_error("'break' outside loop", leaf)
elif leaf.value in ('yield', 'return'):
if self._context.node.type != 'funcdef':
self._add_syntax_error("'%s' outside function" % leaf.value, leaf)
self._add_syntax_error("'%s' outside function" % leaf.value, leaf.parent)
elif self._context.is_async_funcdef() and leaf.value == 'return' \
and leaf.parent.type == 'return_stmt' \
and any(self._context.node.iter_yield_exprs()):
self._add_syntax_error("'return' with value in async generator", leaf.parent)
elif leaf.value == 'await':
if not self._context.is_async_funcdef():
self._add_syntax_error("'await' outside async function", leaf)
self._add_syntax_error("'await' outside async function", leaf.parent)
elif leaf.value == 'from' and leaf.parent.type == 'yield_arg' \
and self._context.is_async_funcdef():
yield_ = leaf.parent.parent