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nexedi
cython
Commits
0a631b46
Commit
0a631b46
authored
Mar 21, 2016
by
Stefan Behnel
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discard empty substrings from the join-list of f-strings
parent
2fa17728
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1
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1 changed file
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17 additions
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4 deletions
+17
-4
Cython/Compiler/ParseTreeTransforms.py
Cython/Compiler/ParseTreeTransforms.py
+17
-4
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Cython/Compiler/ParseTreeTransforms.py
View file @
0a631b46
...
@@ -349,10 +349,23 @@ class PostParse(ScopeTrackingTransform):
...
@@ -349,10 +349,23 @@ class PostParse(ScopeTrackingTransform):
return
node
return
node
def
visit_JoinedStrNode
(
self
,
node
):
def
visit_JoinedStrNode
(
self
,
node
):
if
len
(
node
.
values
)
==
1
:
"""
# this is not uncommon because f-string format specs are parsed into JoinedStrNodes
Clean up after the parser by wrapping the substrings in a ListNode and
return
node
.
values
[
0
]
discarding empty Unicode strings. Empty or single-value join lists are not
node
.
values
=
ExprNodes
.
ListNode
(
node
.
pos
,
args
=
node
.
values
)
uncommon because f-string format specs are always parsed into JoinedStrNodes.
"""
values
=
[]
for
value
in
node
.
values
:
if
isinstance
(
value
,
ExprNodes
.
UnicodeNode
)
and
not
value
.
value
:
continue
# ignore empty Unicode strings
values
.
append
(
value
)
if
not
values
:
node
=
ExprNodes
.
UnicodeNode
(
node
.
pos
,
value
=
EncodedString
(
''
))
elif
len
(
values
)
==
1
:
node
=
values
[
0
]
else
:
node
.
values
=
ExprNodes
.
ListNode
(
node
.
pos
,
args
=
values
)
self
.
visitchildren
(
node
)
self
.
visitchildren
(
node
)
return
node
return
node
...
...
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