Mercurial > cpython-lru_cache-weakref

annotate Lib/textwrap.py @ 78069:a8aa77458e12 3.2

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Add c_size_t and c_ssize_t to the ctypes summary table.
author Antoine Pitrou <solipsis@pitrou.net>
date Thu, 12 Jul 2012 20:31:50 +0200
parents 3e26c9033306
children 6b9f0a6efaeb
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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34d7137098a7 Docstring improvements. In particular, added docstrings for the
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1 """Text wrapping and filling.
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2 """
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3
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4 # Copyright (C) 1999-2001 Gregory P. Ward.
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5 # Copyright (C) 2002, 2003 Python Software Foundation.
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6 # Written by Greg Ward <gward@python.net>
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7
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8 import string, re
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9
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10 __all__ = ['TextWrapper', 'wrap', 'fill', 'dedent']
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11
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12 # Hardcode the recognized whitespace characters to the US-ASCII
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13 # whitespace characters. The main reason for doing this is that in
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14 # ISO-8859-1, 0xa0 is non-breaking whitespace, so in certain locales
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15 # that character winds up in string.whitespace. Respecting
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16 # string.whitespace in those cases would 1) make textwrap treat 0xa0 the
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17 # same as any other whitespace char, which is clearly wrong (it's a
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18 # *non-breaking* space), 2) possibly cause problems with Unicode,
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19 # since 0xa0 is not in range(128).
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20 _whitespace = '\t\n\x0b\x0c\r '
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21
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22 class TextWrapper:
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23 """
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24 Object for wrapping/filling text. The public interface consists of
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25 the wrap() and fill() methods; the other methods are just there for
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26 subclasses to override in order to tweak the default behaviour.
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27 If you want to completely replace the main wrapping algorithm,
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28 you'll probably have to override _wrap_chunks().
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29
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30 Several instance attributes control various aspects of wrapping:
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31 width (default: 70)
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32 the maximum width of wrapped lines (unless break_long_words
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33 is false)
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34 initial_indent (default: "")
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35 string that will be prepended to the first line of wrapped
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36 output. Counts towards the line's width.
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37 subsequent_indent (default: "")
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38 string that will be prepended to all lines save the first
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39 of wrapped output; also counts towards each line's width.
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40 expand_tabs (default: true)
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41 Expand tabs in input text to spaces before further processing.
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42 Each tab will become 1 .. 8 spaces, depending on its position in
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43 its line. If false, each tab is treated as a single character.
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44 replace_whitespace (default: true)
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45 Replace all whitespace characters in the input text by spaces
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46 after tab expansion. Note that if expand_tabs is false and
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47 replace_whitespace is true, every tab will be converted to a
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48 single space!
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49 fix_sentence_endings (default: false)
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50 Ensure that sentence-ending punctuation is always followed
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51 by two spaces. Off by default because the algorithm is
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52 (unavoidably) imperfect.
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53 break_long_words (default: true)
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54 Break words longer than 'width'. If false, those words will not
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55 be broken, and some lines might be longer than 'width'.
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56 break_on_hyphens (default: true)
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57 Allow breaking hyphenated words. If true, wrapping will occur
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58 preferably on whitespaces and right after hyphens part of
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59 compound words.
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60 drop_whitespace (default: true)
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61 Drop leading and trailing whitespace from lines.
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62 """
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63
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64 unicode_whitespace_trans = {}
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65 uspace = ord(' ')
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66 for x in _whitespace:
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67 unicode_whitespace_trans[ord(x)] = uspace
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68
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69 # This funky little regex is just the trick for splitting
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70 # text up into word-wrappable chunks. E.g.
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71 # "Hello there -- you goof-ball, use the -b option!"
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72 # splits into
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73 # Hello/ /there/ /--/ /you/ /goof-/ball,/ /use/ /the/ /-b/ /option!
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74 # (after stripping out empty strings).
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75 wordsep_re = re.compile(
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76 r'(\s+|' # any whitespace
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77 r'[^\s\w]*\w+[^0-9\W]-(?=\w+[^0-9\W])|' # hyphenated words
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78 r'(?<=[\w\!\"\'\&\.\,\?])-{2,}(?=\w))') # em-dash
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79
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80 # This less funky little regex just split on recognized spaces. E.g.
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81 # "Hello there -- you goof-ball, use the -b option!"
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82 # splits into
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83 # Hello/ /there/ /--/ /you/ /goof-ball,/ /use/ /the/ /-b/ /option!/
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84 wordsep_simple_re = re.compile(r'(\s+)')
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85
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86 # XXX this is not locale- or charset-aware -- string.lowercase
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87 # is US-ASCII only (and therefore English-only)
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88 sentence_end_re = re.compile(r'[a-z]' # lowercase letter
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89 r'[\.\!\?]' # sentence-ending punct.
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90 r'[\"\']?' # optional end-of-quote
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91 r'\Z') # end of chunk
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92
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93
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94 def __init__(self,
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95 width=70,
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96 initial_indent="",
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97 subsequent_indent="",
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98 expand_tabs=True,
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99 replace_whitespace=True,
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100 fix_sentence_endings=False,
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101 break_long_words=True,
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102 drop_whitespace=True,
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103 break_on_hyphens=True):
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104 self.width = width
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105 self.initial_indent = initial_indent
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106 self.subsequent_indent = subsequent_indent
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107 self.expand_tabs = expand_tabs
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108 self.replace_whitespace = replace_whitespace
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109 self.fix_sentence_endings = fix_sentence_endings
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110 self.break_long_words = break_long_words
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111 self.drop_whitespace = drop_whitespace
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112 self.break_on_hyphens = break_on_hyphens
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113
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114
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115 # -- Private methods -----------------------------------------------
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116 # (possibly useful for subclasses to override)
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117
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118 def _munge_whitespace(self, text):
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119 """_munge_whitespace(text : string) -> string
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120
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121 Munge whitespace in text: expand tabs and convert all other
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122 whitespace characters to spaces. Eg. " foo\tbar\n\nbaz"
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123 becomes " foo bar baz".
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124 """
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125 if self.expand_tabs:
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126 text = text.expandtabs()
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127 if self.replace_whitespace:
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128 text = text.translate(self.unicode_whitespace_trans)
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129 return text
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130
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131
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132 def _split(self, text):
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133 """_split(text : string) -> [string]
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134
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135 Split the text to wrap into indivisible chunks. Chunks are
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136 not quite the same as words; see _wrap_chunks() for full
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137 details. As an example, the text
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138 Look, goof-ball -- use the -b option!
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139 breaks into the following chunks:
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140 'Look,', ' ', 'goof-', 'ball', ' ', '--', ' ',
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141 'use', ' ', 'the', ' ', '-b', ' ', 'option!'
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142 if break_on_hyphens is True, or in:
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143 'Look,', ' ', 'goof-ball', ' ', '--', ' ',
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144 'use', ' ', 'the', ' ', '-b', ' ', option!'
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145 otherwise.
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146 """
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147 if self.break_on_hyphens is True:
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148 chunks = self.wordsep_re.split(text)
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149 else:
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150 chunks = self.wordsep_simple_re.split(text)
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151 chunks = [c for c in chunks if c]
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152 return chunks
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153
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154 def _fix_sentence_endings(self, chunks):
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155 """_fix_sentence_endings(chunks : [string])
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156
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157 Correct for sentence endings buried in 'chunks'. Eg. when the
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158 original text contains "... foo.\nBar ...", munge_whitespace()
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159 and split() will convert that to [..., "foo.", " ", "Bar", ...]
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160 which has one too few spaces; this method simply changes the one
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161 space to two.
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162 """
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163 i = 0
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164 patsearch = self.sentence_end_re.search
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165 while i < len(chunks)-1:
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166 if chunks[i+1] == " " and patsearch(chunks[i]):
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167 chunks[i+1] = " "
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168 i += 2
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169 else:
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170 i += 1
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171
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172 def _handle_long_word(self, reversed_chunks, cur_line, cur_len, width):
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173 """_handle_long_word(chunks : [string],
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174 cur_line : [string],
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175 cur_len : int, width : int)
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176
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177 Handle a chunk of text (most likely a word, not whitespace) that
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178 is too long to fit in any line.
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179 """
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180 # Figure out when indent is larger than the specified width, and make
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181 # sure at least one character is stripped off on every pass
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182 if width < 1:
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183 space_left = 1
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184 else:
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185 space_left = width - cur_len
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186
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187 # If we're allowed to break long words, then do so: put as much
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188 # of the next chunk onto the current line as will fit.
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189 if self.break_long_words:
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190 cur_line.append(reversed_chunks[-1][:space_left])
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191 reversed_chunks[-1] = reversed_chunks[-1][space_left:]
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192
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193 # Otherwise, we have to preserve the long word intact. Only add
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194 # it to the current line if there's nothing already there --
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195 # that minimizes how much we violate the width constraint.
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196 elif not cur_line:
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197 cur_line.append(reversed_chunks.pop())
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198
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199 # If we're not allowed to break long words, and there's already
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200 # text on the current line, do nothing. Next time through the
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201 # main loop of _wrap_chunks(), we'll wind up here again, but
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202 # cur_len will be zero, so the next line will be entirely
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203 # devoted to the long word that we can't handle right now.
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204
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205 def _wrap_chunks(self, chunks):
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206 """_wrap_chunks(chunks : [string]) -> [string]
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207
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208 Wrap a sequence of text chunks and return a list of lines of
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209 length 'self.width' or less. (If 'break_long_words' is false,
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210 some lines may be longer than this.) Chunks correspond roughly
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211 to words and the whitespace between them: each chunk is
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212 indivisible (modulo 'break_long_words'), but a line break can
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213 come between any two chunks. Chunks should not have internal
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214 whitespace; ie. a chunk is either all whitespace or a "word".
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215 Whitespace chunks will be removed from the beginning and end of
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216 lines, but apart from that whitespace is preserved.
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217 """
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218 lines = []
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219 if self.width <= 0:
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220 raise ValueError("invalid width %r (must be > 0)" % self.width)
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221
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222 # Arrange in reverse order so items can be efficiently popped
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223 # from a stack of chucks.
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224 chunks.reverse()
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225
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226 while chunks:
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227
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228 # Start the list of chunks that will make up the current line.
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229 # cur_len is just the length of all the chunks in cur_line.
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230 cur_line = []
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231 cur_len = 0
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232
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233 # Figure out which static string will prefix this line.
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234 if lines:
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235 indent = self.subsequent_indent
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236 else:
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237 indent = self.initial_indent
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238
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239 # Maximum width for this line.
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240 width = self.width - len(indent)
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241
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242 # First chunk on line is whitespace -- drop it, unless this
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243 # is the very beginning of the text (ie. no lines started yet).
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244 if self.drop_whitespace and chunks[-1].strip() == '' and lines:
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245 del chunks[-1]
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246
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247 while chunks:
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248 l = len(chunks[-1])
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249
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250 # Can at least squeeze this chunk onto the current line.
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251 if cur_len + l <= width:
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252 cur_line.append(chunks.pop())
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253 cur_len += l
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254
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255 # Nope, this line is full.
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256 else:
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257 break
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258
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259 # The current line is full, and the next chunk is too big to
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260 # fit on *any* line (not just this one).
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261 if chunks and len(chunks[-1]) > width:
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262 self._handle_long_word(chunks, cur_line, cur_len, width)
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263
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264 # If the last chunk on this line is all whitespace, drop it.
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265 if self.drop_whitespace and cur_line and cur_line[-1].strip() == '':
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266 del cur_line[-1]
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267
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268 # Convert current line back to a string and store it in list
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269 # of all lines (return value).
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270 if cur_line:
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271 lines.append(indent + ''.join(cur_line))
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272
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273 return lines
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274
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275
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276 # -- Public interface ----------------------------------------------
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277
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278 def wrap(self, text):
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279 """wrap(text : string) -> [string]
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280
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281 Reformat the single paragraph in 'text' so it fits in lines of
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282 no more than 'self.width' columns, and return a list of wrapped
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283 lines. Tabs in 'text' are expanded with string.expandtabs(),
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284 and all other whitespace characters (including newline) are
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285 converted to space.
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286 """
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287 text = self._munge_whitespace(text)
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288 chunks = self._split(text)
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289 if self.fix_sentence_endings:
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290 self._fix_sentence_endings(chunks)
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291 return self._wrap_chunks(chunks)
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292
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293 def fill(self, text):
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294 """fill(text : string) -> string
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295
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296 Reformat the single paragraph in 'text' to fit in lines of no
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297 more than 'self.width' columns, and return a new string
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298 containing the entire wrapped paragraph.
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299 """
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300 return "\n".join(self.wrap(text))
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301
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302
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303 # -- Convenience interface ---------------------------------------------
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304
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305 def wrap(text, width=70, **kwargs):
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306 """Wrap a single paragraph of text, returning a list of wrapped lines.
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307
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308 Reformat the single paragraph in 'text' so it fits in lines of no
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309 more than 'width' columns, and return a list of wrapped lines. By
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310 default, tabs in 'text' are expanded with string.expandtabs(), and
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311 all other whitespace characters (including newline) are converted to
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312 space. See TextWrapper class for available keyword args to customize
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313 wrapping behaviour.
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314 """
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315 w = TextWrapper(width=width, **kwargs)
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316 return w.wrap(text)
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317
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318 def fill(text, width=70, **kwargs):
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319 """Fill a single paragraph of text, returning a new string.
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320
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321 Reformat the single paragraph in 'text' to fit in lines of no more
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322 than 'width' columns, and return a new string containing the entire
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323 wrapped paragraph. As with wrap(), tabs are expanded and other
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324 whitespace characters converted to space. See TextWrapper class for
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325 available keyword args to customize wrapping behaviour.
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326 """
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327 w = TextWrapper(width=width, **kwargs)
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328 return w.fill(text)
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329
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330
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331 # -- Loosely related functionality -------------------------------------
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332
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333 _whitespace_only_re = re.compile('^[ \t]+$', re.MULTILINE)
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334 _leading_whitespace_re = re.compile('(^[ \t]*)(?:[^ \t\n])', re.MULTILINE)
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335
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336 def dedent(text):
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337 """Remove any common leading whitespace from every line in `text`.
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338
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339 This can be used to make triple-quoted strings line up with the left
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340 edge of the display, while still presenting them in the source code
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341 in indented form.
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342
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343 Note that tabs and spaces are both treated as whitespace, but they
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344 are not equal: the lines " hello" and "\thello" are
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345 considered to have no common leading whitespace. (This behaviour is
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346 new in Python 2.5; older versions of this module incorrectly
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347 expanded tabs before searching for common leading whitespace.)
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348 """
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349 # Look for the longest leading string of spaces and tabs common to
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350 # all lines.
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351 margin = None
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352 text = _whitespace_only_re.sub('', text)
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353 indents = _leading_whitespace_re.findall(text)
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354 for indent in indents:
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355 if margin is None:
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356 margin = indent
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357
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358 # Current line more deeply indented than previous winner:
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359 # no change (previous winner is still on top).
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360 elif indent.startswith(margin):
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361 pass
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362
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363 # Current line consistent with and no deeper than previous winner:
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364 # it's the new winner.
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365 elif margin.startswith(indent):
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366 margin = indent
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367
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368 # Current line and previous winner have no common whitespace:
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369 # there is no margin.
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370 else:
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371 margin = ""
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372 break
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373
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374 # sanity check (testing/debugging only)
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parents: 35235
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375 if 0 and margin:
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35235
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376 for line in text.split("\n"):
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35235
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377 assert not line or line.startswith(margin), \
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35235
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378 "line = %r, margin = %r" % (line, margin)
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
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parents: 35235
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379
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35235
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380 if margin:
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35235
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381 text = re.sub(r'(?m)^' + margin, '', text)
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35235
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382 return text
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35235
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383
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parents: 35235
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384 if __name__ == "__main__":
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Thomas Wouters <thomas@python.org>
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385 #print dedent("\tfoo\n\tbar")
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
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386 #print dedent(" \thello there\n \t how are you?")
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4cdf21a0dbbc Fix most trivially-findable print statements.
Guido van Rossum <guido@python.org>
parents: 39442
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387 print(dedent("Hello there.\n This is indented."))