Mercurial > cpython-lru_cache-weakref

annotate Lib/formatter.py @ 25838:8540887bcec6 2.2

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Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.
author Guido van Rossum <guido@python.org>
date Fri, 18 Oct 2002 13:42:21 +0000
parents 99df257142f6
children 3caee2958387
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1 """Generic output formatting.
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2
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3 Formatter objects transform an abstract flow of formatting events into
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4 specific output events on writer objects. Formatters manage several stack
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5 structures to allow various properties of a writer object to be changed and
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6 restored; writers need not be able to handle relative changes nor any sort
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7 of ``change back'' operation. Specific writer properties which may be
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8 controlled via formatter objects are horizontal alignment, font, and left
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9 margin indentations. A mechanism is provided which supports providing
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10 arbitrary, non-exclusive style settings to a writer as well. Additional
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11 interfaces facilitate formatting events which are not reversible, such as
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12 paragraph separation.
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13
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14 Writer objects encapsulate device interfaces. Abstract devices, such as
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15 file formats, are supported as well as physical devices. The provided
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16 implementations all work with abstract devices. The interface makes
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17 available mechanisms for setting the properties which formatter objects
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18 manage and inserting data into the output.
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19 """
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20
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21 import string
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22 import sys
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23 from types import StringType
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24
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25
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26 AS_IS = None
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27
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28
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29 class NullFormatter:
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30 """A formatter which does nothing.
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31
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32 If the writer parameter is omitted, a NullWriter instance is created.
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33 No methods of the writer are called by NullFormatter instances.
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34
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35 Implementations should inherit from this class if implementing a writer
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36 interface but don't need to inherit any implementation.
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37
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38 """
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39
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40 def __init__(self, writer=None):
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41 if not writer:
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42 writer = NullWriter()
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43 self.writer = writer
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44 def end_paragraph(self, blankline): pass
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45 def add_line_break(self): pass
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46 def add_hor_rule(self, *args, **kw): pass
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47 def add_label_data(self, format, counter, blankline=None): pass
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48 def add_flowing_data(self, data): pass
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49 def add_literal_data(self, data): pass
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50 def flush_softspace(self): pass
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51 def push_alignment(self, align): pass
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52 def pop_alignment(self): pass
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53 def push_font(self, x): pass
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54 def pop_font(self): pass
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55 def push_margin(self, margin): pass
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56 def pop_margin(self): pass
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57 def set_spacing(self, spacing): pass
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58 def push_style(self, *styles): pass
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59 def pop_style(self, n=1): pass
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60 def assert_line_data(self, flag=1): pass
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61
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62
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63 class AbstractFormatter:
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64 """The standard formatter.
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65
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66 This implementation has demonstrated wide applicability to many writers,
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67 and may be used directly in most circumstances. It has been used to
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68 implement a full-featured World Wide Web browser.
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69
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70 """
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71
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72 # Space handling policy: blank spaces at the boundary between elements
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73 # are handled by the outermost context. "Literal" data is not checked
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74 # to determine context, so spaces in literal data are handled directly
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75 # in all circumstances.
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76
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77 def __init__(self, writer):
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78 self.writer = writer # Output device
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79 self.align = None # Current alignment
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80 self.align_stack = [] # Alignment stack
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81 self.font_stack = [] # Font state
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82 self.margin_stack = [] # Margin state
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83 self.spacing = None # Vertical spacing state
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84 self.style_stack = [] # Other state, e.g. color
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85 self.nospace = 1 # Should leading space be suppressed
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86 self.softspace = 0 # Should a space be inserted
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87 self.para_end = 1 # Just ended a paragraph
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88 self.parskip = 0 # Skipped space between paragraphs?
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89 self.hard_break = 1 # Have a hard break
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90 self.have_label = 0
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91
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92 def end_paragraph(self, blankline):
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93 if not self.hard_break:
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94 self.writer.send_line_break()
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95 self.have_label = 0
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96 if self.parskip < blankline and not self.have_label:
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97 self.writer.send_paragraph(blankline - self.parskip)
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98 self.parskip = blankline
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99 self.have_label = 0
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100 self.hard_break = self.nospace = self.para_end = 1
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101 self.softspace = 0
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102
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103 def add_line_break(self):
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104 if not (self.hard_break or self.para_end):
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105 self.writer.send_line_break()
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106 self.have_label = self.parskip = 0
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107 self.hard_break = self.nospace = 1
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108 self.softspace = 0
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109
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110 def add_hor_rule(self, *args, **kw):
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111 if not self.hard_break:
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112 self.writer.send_line_break()
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113 apply(self.writer.send_hor_rule, args, kw)
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114 self.hard_break = self.nospace = 1
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115 self.have_label = self.para_end = self.softspace = self.parskip = 0
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116
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117 def add_label_data(self, format, counter, blankline = None):
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118 if self.have_label or not self.hard_break:
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119 self.writer.send_line_break()
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120 if not self.para_end:
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121 self.writer.send_paragraph((blankline and 1) or 0)
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122 if type(format) is StringType:
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123 self.writer.send_label_data(self.format_counter(format, counter))
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124 else:
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125 self.writer.send_label_data(format)
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126 self.nospace = self.have_label = self.hard_break = self.para_end = 1
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127 self.softspace = self.parskip = 0
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128
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129 def format_counter(self, format, counter):
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130 label = ''
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131 for c in format:
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132 if c == '1':
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133 label = label + ('%d' % counter)
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134 elif c in 'aA':
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135 if counter > 0:
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136 label = label + self.format_letter(c, counter)
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137 elif c in 'iI':
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138 if counter > 0:
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139 label = label + self.format_roman(c, counter)
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140 else:
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141 label = label + c
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142 return label
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143
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144 def format_letter(self, case, counter):
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145 label = ''
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146 while counter > 0:
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147 counter, x = divmod(counter-1, 26)
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148 # This makes a strong assumption that lowercase letters
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149 # and uppercase letters form two contiguous blocks, with
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150 # letters in order!
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151 s = chr(ord(case) + x)
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152 label = s + label
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153 return label
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154
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155 def format_roman(self, case, counter):
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156 ones = ['i', 'x', 'c', 'm']
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157 fives = ['v', 'l', 'd']
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158 label, index = '', 0
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159 # This will die of IndexError when counter is too big
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160 while counter > 0:
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161 counter, x = divmod(counter, 10)
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162 if x == 9:
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163 label = ones[index] + ones[index+1] + label
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164 elif x == 4:
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165 label = ones[index] + fives[index] + label
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166 else:
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167 if x >= 5:
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168 s = fives[index]
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169 x = x-5
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170 else:
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171 s = ''
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172 s = s + ones[index]*x
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173 label = s + label
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174 index = index + 1
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175 if case == 'I':
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176 return label.upper()
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177 return label
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178
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179 def add_flowing_data(self, data,
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180 # These are only here to load them into locals:
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181 whitespace = string.whitespace,
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182 join = string.join, split = string.split):
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183 if not data: return
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184 # The following looks a bit convoluted but is a great improvement over
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185 # data = regsub.gsub('[' + string.whitespace + ']+', ' ', data)
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186 prespace = data[:1] in whitespace
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187 postspace = data[-1:] in whitespace
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188 data = join(split(data))
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189 if self.nospace and not data:
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190 return
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191 elif prespace or self.softspace:
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192 if not data:
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193 if not self.nospace:
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194 self.softspace = 1
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195 self.parskip = 0
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196 return
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197 if not self.nospace:
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198 data = ' ' + data
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199 self.hard_break = self.nospace = self.para_end = \
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200 self.parskip = self.have_label = 0
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201 self.softspace = postspace
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202 self.writer.send_flowing_data(data)
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203
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204 def add_literal_data(self, data):
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205 if not data: return
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206 if self.softspace:
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207 self.writer.send_flowing_data(" ")
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208 self.hard_break = data[-1:] == '\n'
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209 self.nospace = self.para_end = self.softspace = \
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210 self.parskip = self.have_label = 0
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211 self.writer.send_literal_data(data)
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212
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diff changeset
213 def flush_softspace(self):
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214 if self.softspace:
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215 self.hard_break = self.para_end = self.parskip = \
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216 self.have_label = self.softspace = 0
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217 self.nospace = 1
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218 self.writer.send_flowing_data(' ')
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diff changeset
219
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220 def push_alignment(self, align):
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221 if align and align != self.align:
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222 self.writer.new_alignment(align)
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223 self.align = align
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224 self.align_stack.append(align)
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225 else:
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226 self.align_stack.append(self.align)
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227
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228 def pop_alignment(self):
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229 if self.align_stack:
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230 del self.align_stack[-1]
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231 if self.align_stack:
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232 self.align = align = self.align_stack[-1]
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233 self.writer.new_alignment(align)
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234 else:
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235 self.align = None
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236 self.writer.new_alignment(None)
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237
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238 def push_font(self, (size, i, b, tt)):
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239 if self.softspace:
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240 self.hard_break = self.para_end = self.softspace = 0
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241 self.nospace = 1
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242 self.writer.send_flowing_data(' ')
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243 if self.font_stack:
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diff changeset
244 csize, ci, cb, ctt = self.font_stack[-1]
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245 if size is AS_IS: size = csize
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246 if i is AS_IS: i = ci
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247 if b is AS_IS: b = cb
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248 if tt is AS_IS: tt = ctt
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249 font = (size, i, b, tt)
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250 self.font_stack.append(font)
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251 self.writer.new_font(font)
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252
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253 def pop_font(self):
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254 if self.font_stack:
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255 del self.font_stack[-1]
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diff changeset
256 if self.font_stack:
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257 font = self.font_stack[-1]
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258 else:
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259 font = None
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260 self.writer.new_font(font)
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261
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262 def push_margin(self, margin):
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263 self.margin_stack.append(margin)
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264 fstack = filter(None, self.margin_stack)
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diff changeset
265 if not margin and fstack:
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266 margin = fstack[-1]
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267 self.writer.new_margin(margin, len(fstack))
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268
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269 def pop_margin(self):
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diff changeset
270 if self.margin_stack:
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diff changeset
271 del self.margin_stack[-1]
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272 fstack = filter(None, self.margin_stack)
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diff changeset
273 if fstack:
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diff changeset
274 margin = fstack[-1]
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diff changeset
275 else:
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diff changeset
276 margin = None
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diff changeset
277 self.writer.new_margin(margin, len(fstack))
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278
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279 def set_spacing(self, spacing):
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280 self.spacing = spacing
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281 self.writer.new_spacing(spacing)
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282
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283 def push_style(self, *styles):
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284 if self.softspace:
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285 self.hard_break = self.para_end = self.softspace = 0
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286 self.nospace = 1
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287 self.writer.send_flowing_data(' ')
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288 for style in styles:
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289 self.style_stack.append(style)
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290 self.writer.new_styles(tuple(self.style_stack))
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291
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292 def pop_style(self, n=1):
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293 del self.style_stack[-n:]
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294 self.writer.new_styles(tuple(self.style_stack))
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295
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296 def assert_line_data(self, flag=1):
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297 self.nospace = self.hard_break = not flag
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298 self.para_end = self.parskip = self.have_label = 0
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299
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300
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301 class NullWriter:
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302 """Minimal writer interface to use in testing & inheritance.
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303
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304 A writer which only provides the interface definition; no actions are
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305 taken on any methods. This should be the base class for all writers
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306 which do not need to inherit any implementation methods.
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307
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308 """
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309 def __init__(self): pass
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310 def flush(self): pass
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311 def new_alignment(self, align): pass
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312 def new_font(self, font): pass
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313 def new_margin(self, margin, level): pass
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314 def new_spacing(self, spacing): pass
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315 def new_styles(self, styles): pass
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316 def send_paragraph(self, blankline): pass
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317 def send_line_break(self): pass
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318 def send_hor_rule(self, *args, **kw): pass
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319 def send_label_data(self, data): pass
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320 def send_flowing_data(self, data): pass
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321 def send_literal_data(self, data): pass
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322
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323
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324 class AbstractWriter(NullWriter):
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325 """A writer which can be used in debugging formatters, but not much else.
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326
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327 Each method simply announces itself by printing its name and
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328 arguments on standard output.
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329
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330 """
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331
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332 def new_alignment(self, align):
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333 print "new_alignment(%s)" % `align`
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334
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335 def new_font(self, font):
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336 print "new_font(%s)" % `font`
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337
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338 def new_margin(self, margin, level):
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339 print "new_margin(%s, %d)" % (`margin`, level)
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340
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341 def new_spacing(self, spacing):
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342 print "new_spacing(%s)" % `spacing`
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343
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344 def new_styles(self, styles):
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345 print "new_styles(%s)" % `styles`
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346
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347 def send_paragraph(self, blankline):
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348 print "send_paragraph(%s)" % `blankline`
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349
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350 def send_line_break(self):
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351 print "send_line_break()"
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352
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353 def send_hor_rule(self, *args, **kw):
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354 print "send_hor_rule()"
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355
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356 def send_label_data(self, data):
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357 print "send_label_data(%s)" % `data`
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358
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359 def send_flowing_data(self, data):
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360 print "send_flowing_data(%s)" % `data`
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361
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362 def send_literal_data(self, data):
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363 print "send_literal_data(%s)" % `data`
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364
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365
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366 class DumbWriter(NullWriter):
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367 """Simple writer class which writes output on the file object passed in
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368 as the file parameter or, if file is omitted, on standard output. The
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369 output is simply word-wrapped to the number of columns specified by
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370 the maxcol parameter. This class is suitable for reflowing a sequence
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371 of paragraphs.
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372
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373 """
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374
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375 def __init__(self, file=None, maxcol=72):
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376 self.file = file or sys.stdout
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377 self.maxcol = maxcol
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378 NullWriter.__init__(self)
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379 self.reset()
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380
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381 def reset(self):
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382 self.col = 0
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383 self.atbreak = 0
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384
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385 def send_paragraph(self, blankline):
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386 self.file.write('\n'*blankline)
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387 self.col = 0
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388 self.atbreak = 0
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389
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390 def send_line_break(self):
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391 self.file.write('\n')
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392 self.col = 0
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393 self.atbreak = 0
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394
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395 def send_hor_rule(self, *args, **kw):
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396 self.file.write('\n')
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397 self.file.write('-'*self.maxcol)
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398 self.file.write('\n')
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399 self.col = 0
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400 self.atbreak = 0
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401
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402 def send_literal_data(self, data):
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403 self.file.write(data)
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404 i = data.rfind('\n')
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405 if i >= 0:
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406 self.col = 0
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407 data = data[i+1:]
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408 data = data.expandtabs()
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409 self.col = self.col + len(data)
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410 self.atbreak = 0
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411
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412 def send_flowing_data(self, data):
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413 if not data: return
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414 atbreak = self.atbreak or data[0] in string.whitespace
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415 col = self.col
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416 maxcol = self.maxcol
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417 write = self.file.write
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418 for word in data.split():
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419 if atbreak:
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420 if col + len(word) >= maxcol:
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421 write('\n')
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422 col = 0
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423 else:
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424 write(' ')
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425 col = col + 1
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426 write(word)
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427 col = col + len(word)
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428 atbreak = 1
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429 self.col = col
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430 self.atbreak = data[-1] in string.whitespace
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431
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432
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433 def test(file = None):
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434 w = DumbWriter()
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435 f = AbstractFormatter(w)
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436 if file:
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437 fp = open(file)
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438 elif sys.argv[1:]:
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439 fp = open(sys.argv[1])
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440 else:
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441 fp = sys.stdin
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442 while 1:
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443 line = fp.readline()
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444 if not line:
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445 break
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446 if line == '\n':
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447 f.end_paragraph(1)
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448 else:
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449 f.add_flowing_data(line)
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450 f.end_paragraph(0)
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451
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452
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453 if __name__ == '__main__':
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454 test()