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1 # |
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2 # Test suite for the textwrap module. |
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3 # |
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4 # Original tests written by Greg Ward <gward@python.net>. |
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5 # Converted to PyUnit by Peter Hansen <peter@engcorp.com>. |
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6 # Currently maintained by Greg Ward. |
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7 # |
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8 # $Id: test_textwrap.py 63053 2008-05-11 10:42:28Z georg.brandl $ |
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9 # |
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10 |
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11 import unittest |
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12 from test import test_support |
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13 |
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14 from textwrap import TextWrapper, wrap, fill, dedent |
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15 |
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16 |
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17 class BaseTestCase(unittest.TestCase): |
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18 '''Parent class with utility methods for textwrap tests.''' |
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19 |
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20 def show(self, textin): |
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21 if isinstance(textin, list): |
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22 result = [] |
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23 for i in range(len(textin)): |
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24 result.append(" %d: %r" % (i, textin[i])) |
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25 result = '\n'.join(result) |
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26 elif isinstance(textin, basestring): |
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27 result = " %s\n" % repr(textin) |
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28 return result |
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29 |
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30 |
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31 def check(self, result, expect): |
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32 self.assertEquals(result, expect, |
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33 'expected:\n%s\nbut got:\n%s' % ( |
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34 self.show(expect), self.show(result))) |
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35 |
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36 def check_wrap(self, text, width, expect, **kwargs): |
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37 result = wrap(text, width, **kwargs) |
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38 self.check(result, expect) |
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39 |
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40 def check_split(self, text, expect): |
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41 result = self.wrapper._split(text) |
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42 self.assertEquals(result, expect, |
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43 "\nexpected %r\n" |
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44 "but got %r" % (expect, result)) |
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45 |
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46 |
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47 class WrapTestCase(BaseTestCase): |
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48 |
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49 def setUp(self): |
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50 self.wrapper = TextWrapper(width=45) |
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51 |
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52 def test_simple(self): |
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53 # Simple case: just words, spaces, and a bit of punctuation |
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54 |
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55 text = "Hello there, how are you this fine day? I'm glad to hear it!" |
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56 |
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57 self.check_wrap(text, 12, |
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58 ["Hello there,", |
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59 "how are you", |
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60 "this fine", |
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61 "day? I'm", |
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62 "glad to hear", |
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63 "it!"]) |
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64 self.check_wrap(text, 42, |
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65 ["Hello there, how are you this fine day?", |
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66 "I'm glad to hear it!"]) |
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67 self.check_wrap(text, 80, [text]) |
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68 |
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69 |
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70 def test_whitespace(self): |
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71 # Whitespace munging and end-of-sentence detection |
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72 |
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73 text = """\ |
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74 This is a paragraph that already has |
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75 line breaks. But some of its lines are much longer than the others, |
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76 so it needs to be wrapped. |
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77 Some lines are \ttabbed too. |
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78 What a mess! |
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79 """ |
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80 |
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81 expect = ["This is a paragraph that already has line", |
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82 "breaks. But some of its lines are much", |
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83 "longer than the others, so it needs to be", |
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84 "wrapped. Some lines are tabbed too. What a", |
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85 "mess!"] |
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86 |
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87 wrapper = TextWrapper(45, fix_sentence_endings=True) |
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88 result = wrapper.wrap(text) |
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89 self.check(result, expect) |
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90 |
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91 result = wrapper.fill(text) |
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92 self.check(result, '\n'.join(expect)) |
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93 |
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94 def test_fix_sentence_endings(self): |
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95 wrapper = TextWrapper(60, fix_sentence_endings=True) |
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96 |
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97 # SF #847346: ensure that fix_sentence_endings=True does the |
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98 # right thing even on input short enough that it doesn't need to |
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99 # be wrapped. |
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100 text = "A short line. Note the single space." |
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101 expect = ["A short line. Note the single space."] |
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102 self.check(wrapper.wrap(text), expect) |
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103 |
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104 # Test some of the hairy end cases that _fix_sentence_endings() |
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105 # is supposed to handle (the easy stuff is tested in |
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106 # test_whitespace() above). |
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107 text = "Well, Doctor? What do you think?" |
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108 expect = ["Well, Doctor? What do you think?"] |
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109 self.check(wrapper.wrap(text), expect) |
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110 |
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111 text = "Well, Doctor?\nWhat do you think?" |
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112 self.check(wrapper.wrap(text), expect) |
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113 |
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114 text = 'I say, chaps! Anyone for "tennis?"\nHmmph!' |
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115 expect = ['I say, chaps! Anyone for "tennis?" Hmmph!'] |
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116 self.check(wrapper.wrap(text), expect) |
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117 |
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118 wrapper.width = 20 |
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119 expect = ['I say, chaps!', 'Anyone for "tennis?"', 'Hmmph!'] |
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120 self.check(wrapper.wrap(text), expect) |
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121 |
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122 text = 'And she said, "Go to hell!"\nCan you believe that?' |
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123 expect = ['And she said, "Go to', |
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124 'hell!" Can you', |
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125 'believe that?'] |
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126 self.check(wrapper.wrap(text), expect) |
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127 |
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128 wrapper.width = 60 |
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129 expect = ['And she said, "Go to hell!" Can you believe that?'] |
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130 self.check(wrapper.wrap(text), expect) |
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131 |
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132 text = 'File stdio.h is nice.' |
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133 expect = ['File stdio.h is nice.'] |
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134 self.check(wrapper.wrap(text), expect) |
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135 |
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136 def test_wrap_short(self): |
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137 # Wrapping to make short lines longer |
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138 |
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139 text = "This is a\nshort paragraph." |
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140 |
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141 self.check_wrap(text, 20, ["This is a short", |
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142 "paragraph."]) |
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143 self.check_wrap(text, 40, ["This is a short paragraph."]) |
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144 |
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145 |
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146 def test_wrap_short_1line(self): |
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147 # Test endcases |
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148 |
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149 text = "This is a short line." |
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150 |
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151 self.check_wrap(text, 30, ["This is a short line."]) |
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152 self.check_wrap(text, 30, ["(1) This is a short line."], |
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153 initial_indent="(1) ") |
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154 |
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155 |
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156 def test_hyphenated(self): |
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157 # Test breaking hyphenated words |
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158 |
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159 text = ("this-is-a-useful-feature-for-" |
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160 "reformatting-posts-from-tim-peters'ly") |
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161 |
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162 self.check_wrap(text, 40, |
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163 ["this-is-a-useful-feature-for-", |
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164 "reformatting-posts-from-tim-peters'ly"]) |
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165 self.check_wrap(text, 41, |
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166 ["this-is-a-useful-feature-for-", |
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167 "reformatting-posts-from-tim-peters'ly"]) |
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168 self.check_wrap(text, 42, |
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169 ["this-is-a-useful-feature-for-reformatting-", |
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170 "posts-from-tim-peters'ly"]) |
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171 |
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172 def test_hyphenated_numbers(self): |
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173 # Test that hyphenated numbers (eg. dates) are not broken like words. |
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174 text = ("Python 1.0.0 was released on 1994-01-26. Python 1.0.1 was\n" |
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175 "released on 1994-02-15.") |
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176 |
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177 self.check_wrap(text, 30, ['Python 1.0.0 was released on', |
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178 '1994-01-26. Python 1.0.1 was', |
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179 'released on 1994-02-15.']) |
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180 self.check_wrap(text, 40, ['Python 1.0.0 was released on 1994-01-26.', |
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181 'Python 1.0.1 was released on 1994-02-15.']) |
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182 |
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183 text = "I do all my shopping at 7-11." |
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184 self.check_wrap(text, 25, ["I do all my shopping at", |
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185 "7-11."]) |
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186 self.check_wrap(text, 27, ["I do all my shopping at", |
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187 "7-11."]) |
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188 self.check_wrap(text, 29, ["I do all my shopping at 7-11."]) |
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189 |
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190 def test_em_dash(self): |
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191 # Test text with em-dashes |
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192 text = "Em-dashes should be written -- thus." |
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193 self.check_wrap(text, 25, |
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194 ["Em-dashes should be", |
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195 "written -- thus."]) |
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196 |
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197 # Probe the boundaries of the properly written em-dash, |
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198 # ie. " -- ". |
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199 self.check_wrap(text, 29, |
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200 ["Em-dashes should be written", |
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201 "-- thus."]) |
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202 expect = ["Em-dashes should be written --", |
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203 "thus."] |
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204 self.check_wrap(text, 30, expect) |
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205 self.check_wrap(text, 35, expect) |
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206 self.check_wrap(text, 36, |
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207 ["Em-dashes should be written -- thus."]) |
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208 |
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209 # The improperly written em-dash is handled too, because |
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210 # it's adjacent to non-whitespace on both sides. |
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211 text = "You can also do--this or even---this." |
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212 expect = ["You can also do", |
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213 "--this or even", |
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214 "---this."] |
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215 self.check_wrap(text, 15, expect) |
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216 self.check_wrap(text, 16, expect) |
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217 expect = ["You can also do--", |
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218 "this or even---", |
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219 "this."] |
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220 self.check_wrap(text, 17, expect) |
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221 self.check_wrap(text, 19, expect) |
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222 expect = ["You can also do--this or even", |
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223 "---this."] |
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224 self.check_wrap(text, 29, expect) |
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225 self.check_wrap(text, 31, expect) |
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226 expect = ["You can also do--this or even---", |
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227 "this."] |
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228 self.check_wrap(text, 32, expect) |
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229 self.check_wrap(text, 35, expect) |
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230 |
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231 # All of the above behaviour could be deduced by probing the |
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232 # _split() method. |
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233 text = "Here's an -- em-dash and--here's another---and another!" |
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234 expect = ["Here's", " ", "an", " ", "--", " ", "em-", "dash", " ", |
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235 "and", "--", "here's", " ", "another", "---", |
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236 "and", " ", "another!"] |
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237 self.check_split(text, expect) |
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238 |
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239 text = "and then--bam!--he was gone" |
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240 expect = ["and", " ", "then", "--", "bam!", "--", |
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241 "he", " ", "was", " ", "gone"] |
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242 self.check_split(text, expect) |
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243 |
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244 |
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245 def test_unix_options (self): |
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246 # Test that Unix-style command-line options are wrapped correctly. |
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247 # Both Optik (OptionParser) and Docutils rely on this behaviour! |
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248 |
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249 text = "You should use the -n option, or --dry-run in its long form." |
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250 self.check_wrap(text, 20, |
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251 ["You should use the", |
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252 "-n option, or --dry-", |
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253 "run in its long", |
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254 "form."]) |
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255 self.check_wrap(text, 21, |
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256 ["You should use the -n", |
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257 "option, or --dry-run", |
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258 "in its long form."]) |
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259 expect = ["You should use the -n option, or", |
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260 "--dry-run in its long form."] |
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261 self.check_wrap(text, 32, expect) |
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262 self.check_wrap(text, 34, expect) |
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263 self.check_wrap(text, 35, expect) |
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264 self.check_wrap(text, 38, expect) |
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265 expect = ["You should use the -n option, or --dry-", |
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266 "run in its long form."] |
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267 self.check_wrap(text, 39, expect) |
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268 self.check_wrap(text, 41, expect) |
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269 expect = ["You should use the -n option, or --dry-run", |
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270 "in its long form."] |
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271 self.check_wrap(text, 42, expect) |
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272 |
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273 # Again, all of the above can be deduced from _split(). |
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274 text = "the -n option, or --dry-run or --dryrun" |
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275 expect = ["the", " ", "-n", " ", "option,", " ", "or", " ", |
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276 "--dry-", "run", " ", "or", " ", "--dryrun"] |
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277 self.check_split(text, expect) |
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278 |
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279 def test_funky_hyphens (self): |
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280 # Screwy edge cases cooked up by David Goodger. All reported |
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281 # in SF bug #596434. |
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282 self.check_split("what the--hey!", ["what", " ", "the", "--", "hey!"]) |
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283 self.check_split("what the--", ["what", " ", "the--"]) |
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284 self.check_split("what the--.", ["what", " ", "the--."]) |
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285 self.check_split("--text--.", ["--text--."]) |
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286 |
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287 # When I first read bug #596434, this is what I thought David |
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288 # was talking about. I was wrong; these have always worked |
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289 # fine. The real problem is tested in test_funky_parens() |
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290 # below... |
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291 self.check_split("--option", ["--option"]) |
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292 self.check_split("--option-opt", ["--option-", "opt"]) |
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293 self.check_split("foo --option-opt bar", |
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294 ["foo", " ", "--option-", "opt", " ", "bar"]) |
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295 |
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296 def test_punct_hyphens(self): |
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297 # Oh bother, SF #965425 found another problem with hyphens -- |
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298 # hyphenated words in single quotes weren't handled correctly. |
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299 # In fact, the bug is that *any* punctuation around a hyphenated |
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300 # word was handled incorrectly, except for a leading "--", which |
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301 # was special-cased for Optik and Docutils. So test a variety |
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302 # of styles of punctuation around a hyphenated word. |
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303 # (Actually this is based on an Optik bug report, #813077). |
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304 self.check_split("the 'wibble-wobble' widget", |
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305 ['the', ' ', "'wibble-", "wobble'", ' ', 'widget']) |
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306 self.check_split('the "wibble-wobble" widget', |
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307 ['the', ' ', '"wibble-', 'wobble"', ' ', 'widget']) |
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308 self.check_split("the (wibble-wobble) widget", |
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309 ['the', ' ', "(wibble-", "wobble)", ' ', 'widget']) |
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310 self.check_split("the ['wibble-wobble'] widget", |
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311 ['the', ' ', "['wibble-", "wobble']", ' ', 'widget']) |
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312 |
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313 def test_funky_parens (self): |
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314 # Second part of SF bug #596434: long option strings inside |
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315 # parentheses. |
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316 self.check_split("foo (--option) bar", |
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317 ["foo", " ", "(--option)", " ", "bar"]) |
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318 |
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319 # Related stuff -- make sure parens work in simpler contexts. |
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320 self.check_split("foo (bar) baz", |
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321 ["foo", " ", "(bar)", " ", "baz"]) |
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322 self.check_split("blah (ding dong), wubba", |
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323 ["blah", " ", "(ding", " ", "dong),", |
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324 " ", "wubba"]) |
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325 |
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326 def test_initial_whitespace(self): |
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327 # SF bug #622849 reported inconsistent handling of leading |
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328 # whitespace; let's test that a bit, shall we? |
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329 text = " This is a sentence with leading whitespace." |
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330 self.check_wrap(text, 50, |
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331 [" This is a sentence with leading whitespace."]) |
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332 self.check_wrap(text, 30, |
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333 [" This is a sentence with", "leading whitespace."]) |
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334 |
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335 def test_no_drop_whitespace(self): |
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336 # SF patch #1581073 |
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337 text = " This is a sentence with much whitespace." |
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338 self.check_wrap(text, 10, |
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339 [" This is a", " ", "sentence ", |
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340 "with ", "much white", "space."], |
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341 drop_whitespace=False) |
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342 |
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343 if test_support.have_unicode: |
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344 def test_unicode(self): |
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345 # *Very* simple test of wrapping Unicode strings. I'm sure |
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346 # there's more to it than this, but let's at least make |
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347 # sure textwrap doesn't crash on Unicode input! |
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348 text = u"Hello there, how are you today?" |
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349 self.check_wrap(text, 50, [u"Hello there, how are you today?"]) |
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350 self.check_wrap(text, 20, [u"Hello there, how are", "you today?"]) |
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351 olines = self.wrapper.wrap(text) |
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352 assert isinstance(olines, list) and isinstance(olines[0], unicode) |
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353 otext = self.wrapper.fill(text) |
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354 assert isinstance(otext, unicode) |
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355 |
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356 def test_split(self): |
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357 # Ensure that the standard _split() method works as advertised |
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358 # in the comments |
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359 |
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360 text = "Hello there -- you goof-ball, use the -b option!" |
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361 |
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362 result = self.wrapper._split(text) |
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363 self.check(result, |
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364 ["Hello", " ", "there", " ", "--", " ", "you", " ", "goof-", |
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365 "ball,", " ", "use", " ", "the", " ", "-b", " ", "option!"]) |
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366 |
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367 def test_break_on_hyphens(self): |
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368 # Ensure that the break_on_hyphens attributes work |
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369 text = "yaba daba-doo" |
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370 self.check_wrap(text, 10, ["yaba daba-", "doo"], |
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371 break_on_hyphens=True) |
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372 self.check_wrap(text, 10, ["yaba", "daba-doo"], |
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373 break_on_hyphens=False) |
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374 |
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375 def test_bad_width(self): |
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376 # Ensure that width <= 0 is caught. |
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377 text = "Whatever, it doesn't matter." |
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378 self.assertRaises(ValueError, wrap, text, 0) |
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379 self.assertRaises(ValueError, wrap, text, -1) |
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380 |
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381 |
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382 class LongWordTestCase (BaseTestCase): |
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383 def setUp(self): |
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384 self.wrapper = TextWrapper() |
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385 self.text = '''\ |
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386 Did you say "supercalifragilisticexpialidocious?" |
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387 How *do* you spell that odd word, anyways? |
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388 ''' |
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389 |
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390 def test_break_long(self): |
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391 # Wrap text with long words and lots of punctuation |
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392 |
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393 self.check_wrap(self.text, 30, |
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394 ['Did you say "supercalifragilis', |
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395 'ticexpialidocious?" How *do*', |
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396 'you spell that odd word,', |
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397 'anyways?']) |
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398 self.check_wrap(self.text, 50, |
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399 ['Did you say "supercalifragilisticexpialidocious?"', |
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400 'How *do* you spell that odd word, anyways?']) |
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401 |
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402 # SF bug 797650. Prevent an infinite loop by making sure that at |
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403 # least one character gets split off on every pass. |
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404 self.check_wrap('-'*10+'hello', 10, |
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405 ['----------', |
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406 ' h', |
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407 ' e', |
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408 ' l', |
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409 ' l', |
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410 ' o'], |
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411 subsequent_indent = ' '*15) |
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412 |
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413 # bug 1146. Prevent a long word to be wrongly wrapped when the |
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414 # preceding word is exactly one character shorter than the width |
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415 self.check_wrap(self.text, 12, |
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416 ['Did you say ', |
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417 '"supercalifr', |
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418 'agilisticexp', |
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419 'ialidocious?', |
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420 '" How *do*', |
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421 'you spell', |
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422 'that odd', |
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423 'word,', |
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424 'anyways?']) |
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425 |
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426 def test_nobreak_long(self): |
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427 # Test with break_long_words disabled |
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428 self.wrapper.break_long_words = 0 |
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429 self.wrapper.width = 30 |
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430 expect = ['Did you say', |
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431 '"supercalifragilisticexpialidocious?"', |
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432 'How *do* you spell that odd', |
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433 'word, anyways?' |
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434 ] |
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435 result = self.wrapper.wrap(self.text) |
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436 self.check(result, expect) |
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437 |
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438 # Same thing with kwargs passed to standalone wrap() function. |
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439 result = wrap(self.text, width=30, break_long_words=0) |
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440 self.check(result, expect) |
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441 |
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442 |
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443 class IndentTestCases(BaseTestCase): |
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444 |
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445 # called before each test method |
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446 def setUp(self): |
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447 self.text = '''\ |
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448 This paragraph will be filled, first without any indentation, |
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449 and then with some (including a hanging indent).''' |
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450 |
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451 |
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452 def test_fill(self): |
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453 # Test the fill() method |
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454 |
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455 expect = '''\ |
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456 This paragraph will be filled, first |
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457 without any indentation, and then with |
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458 some (including a hanging indent).''' |
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459 |
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460 result = fill(self.text, 40) |
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461 self.check(result, expect) |
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462 |
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463 |
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464 def test_initial_indent(self): |
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465 # Test initial_indent parameter |
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466 |
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467 expect = [" This paragraph will be filled,", |
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468 "first without any indentation, and then", |
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469 "with some (including a hanging indent)."] |
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470 result = wrap(self.text, 40, initial_indent=" ") |
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471 self.check(result, expect) |
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472 |
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473 expect = "\n".join(expect) |
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474 result = fill(self.text, 40, initial_indent=" ") |
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475 self.check(result, expect) |
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476 |
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477 |
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478 def test_subsequent_indent(self): |
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479 # Test subsequent_indent parameter |
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480 |
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481 expect = '''\ |
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482 * This paragraph will be filled, first |
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483 without any indentation, and then |
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484 with some (including a hanging |
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485 indent).''' |
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486 |
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487 result = fill(self.text, 40, |
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488 initial_indent=" * ", subsequent_indent=" ") |
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489 self.check(result, expect) |
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490 |
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491 |
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492 # Despite the similar names, DedentTestCase is *not* the inverse |
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493 # of IndentTestCase! |
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494 class DedentTestCase(unittest.TestCase): |
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495 |
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496 def assertUnchanged(self, text): |
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497 """assert that dedent() has no effect on 'text'""" |
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498 self.assertEquals(text, dedent(text)) |
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499 |
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500 def test_dedent_nomargin(self): |
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501 # No lines indented. |
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502 text = "Hello there.\nHow are you?\nOh good, I'm glad." |
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503 self.assertUnchanged(text) |
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504 |
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505 # Similar, with a blank line. |
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506 text = "Hello there.\n\nBoo!" |
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507 self.assertUnchanged(text) |
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508 |
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509 # Some lines indented, but overall margin is still zero. |
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510 text = "Hello there.\n This is indented." |
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511 self.assertUnchanged(text) |
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512 |
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513 # Again, add a blank line. |
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514 text = "Hello there.\n\n Boo!\n" |
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515 self.assertUnchanged(text) |
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516 |
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517 def test_dedent_even(self): |
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518 # All lines indented by two spaces. |
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519 text = " Hello there.\n How are ya?\n Oh good." |
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520 expect = "Hello there.\nHow are ya?\nOh good." |
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521 self.assertEquals(expect, dedent(text)) |
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522 |
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523 # Same, with blank lines. |
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524 text = " Hello there.\n\n How are ya?\n Oh good.\n" |
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525 expect = "Hello there.\n\nHow are ya?\nOh good.\n" |
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526 self.assertEquals(expect, dedent(text)) |
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527 |
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528 # Now indent one of the blank lines. |
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529 text = " Hello there.\n \n How are ya?\n Oh good.\n" |
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530 expect = "Hello there.\n\nHow are ya?\nOh good.\n" |
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531 self.assertEquals(expect, dedent(text)) |
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532 |
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533 def test_dedent_uneven(self): |
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534 # Lines indented unevenly. |
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535 text = '''\ |
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536 def foo(): |
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537 while 1: |
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538 return foo |
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539 ''' |
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540 expect = '''\ |
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541 def foo(): |
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542 while 1: |
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543 return foo |
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544 ''' |
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545 self.assertEquals(expect, dedent(text)) |
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546 |
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547 # Uneven indentation with a blank line. |
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548 text = " Foo\n Bar\n\n Baz\n" |
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549 expect = "Foo\n Bar\n\n Baz\n" |
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550 self.assertEquals(expect, dedent(text)) |
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551 |
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552 # Uneven indentation with a whitespace-only line. |
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553 text = " Foo\n Bar\n \n Baz\n" |
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554 expect = "Foo\n Bar\n\n Baz\n" |
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555 self.assertEquals(expect, dedent(text)) |
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556 |
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557 # dedent() should not mangle internal tabs |
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558 def test_dedent_preserve_internal_tabs(self): |
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559 text = " hello\tthere\n how are\tyou?" |
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560 expect = "hello\tthere\nhow are\tyou?" |
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561 self.assertEquals(expect, dedent(text)) |
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562 |
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563 # make sure that it preserves tabs when it's not making any |
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564 # changes at all |
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565 self.assertEquals(expect, dedent(expect)) |
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566 |
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567 # dedent() should not mangle tabs in the margin (i.e. |
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568 # tabs and spaces both count as margin, but are *not* |
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569 # considered equivalent) |
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570 def test_dedent_preserve_margin_tabs(self): |
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571 text = " hello there\n\thow are you?" |
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572 self.assertUnchanged(text) |
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573 |
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574 # same effect even if we have 8 spaces |
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575 text = " hello there\n\thow are you?" |
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576 self.assertUnchanged(text) |
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577 |
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578 # dedent() only removes whitespace that can be uniformly removed! |
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579 text = "\thello there\n\thow are you?" |
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580 expect = "hello there\nhow are you?" |
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581 self.assertEquals(expect, dedent(text)) |
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582 |
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583 text = " \thello there\n \thow are you?" |
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584 self.assertEquals(expect, dedent(text)) |
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585 |
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586 text = " \t hello there\n \t how are you?" |
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587 self.assertEquals(expect, dedent(text)) |
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588 |
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589 text = " \thello there\n \t how are you?" |
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590 expect = "hello there\n how are you?" |
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591 self.assertEquals(expect, dedent(text)) |
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592 |
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593 |
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594 def test_main(): |
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595 test_support.run_unittest(WrapTestCase, |
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596 LongWordTestCase, |
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597 IndentTestCases, |
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598 DedentTestCase) |
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599 |
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600 if __name__ == '__main__': |
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601 test_main() |