Edit File: textwrap.py
"""Text wrapping and filling. """ # Copyright (C) 1999-2001 Gregory P. Ward. # Copyright (C) 2002, 2003 Python Software Foundation. # Written by Greg Ward <gward@python.net> __revision__ = "$Id$" import string, re try: _unicode = unicode except NameError: # If Python is built without Unicode support, the unicode type # will not exist. Fake one. class _unicode(object): pass # Do the right thing with boolean values for all known Python versions # (so this module can be copied to projects that don't depend on Python # 2.3, e.g. Optik and Docutils) by uncommenting the block of code below. #try: # True, False #except NameError: # (True, False) = (1, 0) __all__ = ['TextWrapper', 'wrap', 'fill', 'dedent'] # Hardcode the recognized whitespace characters to the US-ASCII # whitespace characters. The main reason for doing this is that in # ISO-8859-1, 0xa0 is non-breaking whitespace, so in certain locales # that character winds up in string.whitespace. Respecting # string.whitespace in those cases would 1) make textwrap treat 0xa0 the # same as any other whitespace char, which is clearly wrong (it's a # *non-breaking* space), 2) possibly cause problems with Unicode, # since 0xa0 is not in range(128). _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 # This funky little regex is just the trick for splitting # text up into word-wrappable chunks. E.g. # "Hello there -- you goof-ball, use the -b option!" # splits into # Hello/ /there/ /--/ /you/ /goof-/ball,/ /use/ /the/ /-b/ /option! # (after stripping out empty strings). wordsep_re = re.compile( r'(\s+|' # any whitespace r'[^\s\w]*\w+[^0-9\W]-(?=\w+[^0-9\W])|' # hyphenated words r'(?<=[\w\!\"\'\&\.\,\?])-{2,}(?=\w))') # em-dash # This less funky little regex just split on recognized spaces. E.g. # "Hello there -- you goof-ball, use the -b option!" # splits into # Hello/ /there/ /--/ /you/ /goof-ball,/ /use/ /the/ /-b/ /option!/ wordsep_simple_re = re.compile(r'(\s+)') # XXX this is not locale- or charset-aware -- string.lowercase # is US-ASCII only (and therefore English-only) sentence_end_re = re.compile(r'[%s]' # lowercase letter r'[\.\!\?]' # sentence-ending punct. r'[\"\']?' # optional end-of-quote r'\Z' # end of chunk % 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 # recompile the regexes for Unicode mode -- done in this clumsy way for # backwards compatibility because it's rather common to monkey-patch # the TextWrapper class' wordsep_re attribute. 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) # -- Private methods ----------------------------------------------- # (possibly useful for subclasses to override) 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\\n\\nbaz" 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 else: if self.break_on_hyphens: pat = self.wordsep_re else: pat = self.wordsep_simple_re chunks = pat.split(text) chunks = filter(None, chunks) # remove empty 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.\\nBar ...", 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 else: 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. """ # Figure out when indent is larger than the specified width, and make # sure at least one character is stripped off on every pass if width < 1: space_left = 1 else: space_left = width - cur_len # If we're allowed to break long words, then do so: put as much # of the next chunk onto the current line as will fit. if self.break_long_words: cur_line.append(reversed_chunks[-1][:space_left]) reversed_chunks[-1] = reversed_chunks[-1][space_left:] # Otherwise, we have to preserve the long word intact. Only add # it to the current line if there's nothing already there -- # that minimizes how much we violate the width constraint. elif not cur_line: cur_line.append(reversed_chunks.pop()) # If we're not allowed to break long words, and there's already # text on the current line, do nothing. Next time through the # main loop of _wrap_chunks(), we'll wind up here again, but # cur_len will be zero, so the next line will be entirely # devoted to the long word that we can't handle right now. 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) # Arrange in reverse order so items can be efficiently popped # from a stack of chucks. chunks.reverse() while chunks: # Start the list of chunks that will make up the current line. # cur_len is just the length of all the chunks in cur_line. cur_line = [] cur_len = 0 # Figure out which static string will prefix this line. if lines: indent = self.subsequent_indent else: indent = self.initial_indent # Maximum width for this line. width = self.width - len(indent) # First chunk on line is whitespace -- drop it, unless this # is the very beginning of the text (ie. no lines started yet). if self.drop_whitespace and chunks[-1].strip() == '' and lines: del chunks[-1] while chunks: l = len(chunks[-1]) # Can at least squeeze this chunk onto the current line. if cur_len + l <= width: cur_line.append(chunks.pop()) cur_len += l # Nope, this line is full. else: break # The current line is full, and the next chunk is too big to # fit on *any* line (not just this one). if chunks and len(chunks[-1]) > width: self._handle_long_word(chunks, cur_line, cur_len, width) # If the last chunk on this line is all whitespace, drop it. if self.drop_whitespace and cur_line and cur_line[-1].strip() == '': del cur_line[-1] # Convert current line back to a string and store it in list # of all lines (return value). if cur_line: lines.append(indent + ''.join(cur_line)) return lines # -- Public interface ---------------------------------------------- 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)) # -- Convenience interface --------------------------------------------- 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) # -- Loosely related functionality ------------------------------------- _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.) Entirely blank lines are normalized to a newline character. """ # Look for the longest leading string of spaces and tabs common to # all lines. margin = None text = _whitespace_only_re.sub('', text) indents = _leading_whitespace_re.findall(text) for indent in indents: if margin is None: margin = indent # Current line more deeply indented than previous winner: # no change (previous winner is still on top). elif indent.startswith(margin): pass # Current line consistent with and no deeper than previous winner: # it's the new winner. elif margin.startswith(indent): margin = indent # Find the largest common whitespace between current line and previous # winner. else: for i, (x, y) in enumerate(zip(margin, indent)): if x != y: margin = margin[:i] break else: margin = margin[:len(indent)] # sanity check (testing/debugging only) if 0 and margin: for line in text.split("\n"): assert not line or line.startswith(margin), \ "line = %r, margin = %r" % (line, margin) if margin: text = re.sub(r'(?m)^' + margin, '', text) return text if __name__ == "__main__": #print dedent("\tfoo\n\tbar") #print dedent(" \thello there\n \t how are you?") print dedent("Hello there.\n This is indented.")
Back to File Manager