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Issue #18960: Fix bugs with Python source code encoding in the second line.

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* The first line of Python script could be executed twice when the source
encoding (not equal to 'utf-8') was specified on the second line.

* Now the source encoding declaration on the second line isn't effective if
the first line contains anything except a comment.

* As a consequence, 'python -x' works now again with files with the source
encoding declarations specified on the second file, and can be used again
to make Python batch files on Windows.

* The tokenize module now ignore the source encoding declaration on the second
line if the first line contains anything except a comment.

* IDLE now ignores the source encoding declaration on the second line if the
first line contains anything except a comment.

* 2to3 and the findnocoding.py script now ignore the source encoding
declaration on the second line if the first line contains anything except
a comment.
This commit is contained in:
Serhiy Storchaka 2014-01-09 18:41:59 +02:00
commit 7282ff6d5b
7 changed files with 87 additions and 5 deletions
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3
Lib/idlelib/IOBinding.py
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@ -64,6 +64,7 @@ encoding = locale_encoding ### KBK 07Sep07 This is used all over IDLE, check!
### 'encoding' is used below in encode(), check!
coding_re = re.compile(r'^[ \t\f]*#.*coding[:=][ \t]*([-\w.]+)', re.ASCII)
blank_re = re.compile(r'^[ \t\f]*(?:[#\r\n]|$)', re.ASCII)
def coding_spec(data):
"""Return the encoding declaration according to PEP 263.
@ -93,6 +94,8 @@ def coding_spec(data):
match = coding_re.match(line)
if match is not None:
break
if not blank_re.match(line):
return None
else:
return None
name = match.group(1)