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textwrap.pyc
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Python Compiled Bytecode
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2014-12-31
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317 lines
# Source Generated with Decompyle++
# File: in.pyc (Python 2.7)
'''Text wrapping and filling.
'''
__revision__ = '$Id$'
import string
import re
try:
_unicode = unicode
except NameError:
class _unicode(object):
pass
__all__ = [
'TextWrapper',
'wrap',
'fill',
'dedent']
_whitespace = '\t\n\x0b\x0c\r '
class TextWrapper:
'''
Object for wrapping/filling text. The public interface consists of
the wrap() and fill() methods; the other methods are just there for
subclasses to override in order to tweak the default behaviour.
If you want to completely replace the main wrapping algorithm,
you\'ll probably have to override _wrap_chunks().
Several instance attributes control various aspects of wrapping:
width (default: 70)
the maximum width of wrapped lines (unless break_long_words
is false)
initial_indent (default: "")
string that will be prepended to the first line of wrapped
output. Counts towards the line\'s width.
subsequent_indent (default: "")
string that will be prepended to all lines save the first
of wrapped output; also counts towards each line\'s width.
expand_tabs (default: true)
Expand tabs in input text to spaces before further processing.
Each tab will become 1 .. 8 spaces, depending on its position in
its line. If false, each tab is treated as a single character.
replace_whitespace (default: true)
Replace all whitespace characters in the input text by spaces
after tab expansion. Note that if expand_tabs is false and
replace_whitespace is true, every tab will be converted to a
single space!
fix_sentence_endings (default: false)
Ensure that sentence-ending punctuation is always followed
by two spaces. Off by default because the algorithm is
(unavoidably) imperfect.
break_long_words (default: true)
Break words longer than \'width\'. If false, those words will not
be broken, and some lines might be longer than \'width\'.
break_on_hyphens (default: true)
Allow breaking hyphenated words. If true, wrapping will occur
preferably on whitespaces and right after hyphens part of
compound words.
drop_whitespace (default: true)
Drop leading and trailing whitespace from lines.
'''
whitespace_trans = string.maketrans(_whitespace, ' ' * len(_whitespace))
unicode_whitespace_trans = { }
uspace = ord(u' ')
for x in map(ord, _whitespace):
unicode_whitespace_trans[x] = uspace
wordsep_re = re.compile('(\\s+|[^\\s\\w]*\\w+[^0-9\\W]-(?=\\w+[^0-9\\W])|(?<=[\\w\\!\\"\\\'\\&\\.\\,\\?])-{2,}(?=\\w))')
wordsep_simple_re = re.compile('(\\s+)')
sentence_end_re = re.compile('[%s][\\.\\!\\?][\\"\\\']?\\Z' % string.lowercase)
def __init__(self, width = 70, initial_indent = '', subsequent_indent = '', expand_tabs = True, replace_whitespace = True, fix_sentence_endings = False, break_long_words = True, drop_whitespace = True, break_on_hyphens = True):
self.width = width
self.initial_indent = initial_indent
self.subsequent_indent = subsequent_indent
self.expand_tabs = expand_tabs
self.replace_whitespace = replace_whitespace
self.fix_sentence_endings = fix_sentence_endings
self.break_long_words = break_long_words
self.drop_whitespace = drop_whitespace
self.break_on_hyphens = break_on_hyphens
self.wordsep_re_uni = re.compile(self.wordsep_re.pattern, re.U)
self.wordsep_simple_re_uni = re.compile(self.wordsep_simple_re.pattern, re.U)
def _munge_whitespace(self, text):
'''_munge_whitespace(text : string) -> string
Munge whitespace in text: expand tabs and convert all other
whitespace characters to spaces. Eg. " foo\tbar
baz"
becomes " foo bar baz".
'''
if self.expand_tabs:
text = text.expandtabs()
if self.replace_whitespace:
if isinstance(text, str):
text = text.translate(self.whitespace_trans)
elif isinstance(text, _unicode):
text = text.translate(self.unicode_whitespace_trans)
return text
def _split(self, text):
"""_split(text : string) -> [string]
Split the text to wrap into indivisible chunks. Chunks are
not quite the same as words; see _wrap_chunks() for full
details. As an example, the text
Look, goof-ball -- use the -b option!
breaks into the following chunks:
'Look,', ' ', 'goof-', 'ball', ' ', '--', ' ',
'use', ' ', 'the', ' ', '-b', ' ', 'option!'
if break_on_hyphens is True, or in:
'Look,', ' ', 'goof-ball', ' ', '--', ' ',
'use', ' ', 'the', ' ', '-b', ' ', option!'
otherwise.
"""
if isinstance(text, _unicode):
if self.break_on_hyphens:
pat = self.wordsep_re_uni
else:
pat = self.wordsep_simple_re_uni
elif self.break_on_hyphens:
pat = self.wordsep_re
else:
pat = self.wordsep_simple_re
chunks = pat.split(text)
chunks = filter(None, chunks)
return chunks
def _fix_sentence_endings(self, chunks):
'''_fix_sentence_endings(chunks : [string])
Correct for sentence endings buried in \'chunks\'. Eg. when the
original text contains "... foo.
Bar ...", munge_whitespace()
and split() will convert that to [..., "foo.", " ", "Bar", ...]
which has one too few spaces; this method simply changes the one
space to two.
'''
i = 0
patsearch = self.sentence_end_re.search
while i < len(chunks) - 1:
if chunks[i + 1] == ' ' and patsearch(chunks[i]):
chunks[i + 1] = ' '
i += 2
continue
i += 1
def _handle_long_word(self, reversed_chunks, cur_line, cur_len, width):
'''_handle_long_word(chunks : [string],
cur_line : [string],
cur_len : int, width : int)
Handle a chunk of text (most likely a word, not whitespace) that
is too long to fit in any line.
'''
if width < 1:
space_left = 1
else:
space_left = width - cur_len
if self.break_long_words:
cur_line.append(reversed_chunks[-1][:space_left])
reversed_chunks[-1] = reversed_chunks[-1][space_left:]
elif not cur_line:
cur_line.append(reversed_chunks.pop())
def _wrap_chunks(self, chunks):
'''_wrap_chunks(chunks : [string]) -> [string]
Wrap a sequence of text chunks and return a list of lines of
length \'self.width\' or less. (If \'break_long_words\' is false,
some lines may be longer than this.) Chunks correspond roughly
to words and the whitespace between them: each chunk is
indivisible (modulo \'break_long_words\'), but a line break can
come between any two chunks. Chunks should not have internal
whitespace; ie. a chunk is either all whitespace or a "word".
Whitespace chunks will be removed from the beginning and end of
lines, but apart from that whitespace is preserved.
'''
lines = []
if self.width <= 0:
raise ValueError('invalid width %r (must be > 0)' % self.width)
chunks.reverse()
while chunks:
cur_line = []
cur_len = 0
if lines:
indent = self.subsequent_indent
else:
indent = self.initial_indent
width = self.width - len(indent)
if self.drop_whitespace and chunks[-1].strip() == '' and lines:
del chunks[-1]
while chunks:
l = len(chunks[-1])
if cur_len + l <= width:
cur_line.append(chunks.pop())
cur_len += l
continue
break
if chunks and len(chunks[-1]) > width:
self._handle_long_word(chunks, cur_line, cur_len, width)
if self.drop_whitespace and cur_line and cur_line[-1].strip() == '':
del cur_line[-1]
if cur_line:
lines.append(indent + ''.join(cur_line))
continue
return lines
def wrap(self, text):
"""wrap(text : string) -> [string]
Reformat the single paragraph in 'text' so it fits in lines of
no more than 'self.width' columns, and return a list of wrapped
lines. Tabs in 'text' are expanded with string.expandtabs(),
and all other whitespace characters (including newline) are
converted to space.
"""
text = self._munge_whitespace(text)
chunks = self._split(text)
if self.fix_sentence_endings:
self._fix_sentence_endings(chunks)
return self._wrap_chunks(chunks)
def fill(self, text):
"""fill(text : string) -> string
Reformat the single paragraph in 'text' to fit in lines of no
more than 'self.width' columns, and return a new string
containing the entire wrapped paragraph.
"""
return '\n'.join(self.wrap(text))
def wrap(text, width = 70, **kwargs):
"""Wrap a single paragraph of text, returning a list of wrapped lines.
Reformat the single paragraph in 'text' so it fits in lines of no
more than 'width' columns, and return a list of wrapped lines. By
default, tabs in 'text' are expanded with string.expandtabs(), and
all other whitespace characters (including newline) are converted to
space. See TextWrapper class for available keyword args to customize
wrapping behaviour.
"""
w = TextWrapper(width = width, **kwargs)
return w.wrap(text)
def fill(text, width = 70, **kwargs):
"""Fill a single paragraph of text, returning a new string.
Reformat the single paragraph in 'text' to fit in lines of no more
than 'width' columns, and return a new string containing the entire
wrapped paragraph. As with wrap(), tabs are expanded and other
whitespace characters converted to space. See TextWrapper class for
available keyword args to customize wrapping behaviour.
"""
w = TextWrapper(width = width, **kwargs)
return w.fill(text)
_whitespace_only_re = re.compile('^[ \t]+$', re.MULTILINE)
_leading_whitespace_re = re.compile('(^[ \t]*)(?:[^ \t\n])', re.MULTILINE)
def dedent(text):
'''Remove any common leading whitespace from every line in `text`.
This can be used to make triple-quoted strings line up with the left
edge of the display, while still presenting them in the source code
in indented form.
Note that tabs and spaces are both treated as whitespace, but they
are not equal: the lines " hello" and "\thello" are
considered to have no common leading whitespace. (This behaviour is
new in Python 2.5; older versions of this module incorrectly
expanded tabs before searching for common leading whitespace.)
'''
margin = None
text = _whitespace_only_re.sub('', text)
indents = _leading_whitespace_re.findall(text)
for indent in indents:
if margin is None:
margin = indent
continue
if indent.startswith(margin):
continue
if margin.startswith(indent):
margin = indent
continue
margin = ''
break
if 0 and margin:
for line in text.split('\n'):
if not not line and line.startswith(margin):
raise AssertionError('line = %r, margin = %r' % (line, margin))
if margin:
text = re.sub('(?m)^' + margin, '', text)
return text
if __name__ == '__main__':
print dedent('Hello there.\n This is indented.')