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annotate HTML.py @ 0:e37910d2c794 draft

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author cstrittmatter
date Mon, 20 Jan 2020 15:11:03 -0500
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1 #!/usr/bin/python
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2 # -*- coding: iso-8859-1 -*-
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3 """
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4 HTML.py - v0.04 2009-07-28 Philippe Lagadec
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5
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6 This module provides a few classes to easily generate HTML code such as tables
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7 and lists.
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8
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9 Project website: http://www.decalage.info/python/html
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10
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11 License: CeCILL (open-source GPL compatible), see source code for details.
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12 http://www.cecill.info
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13 """
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14
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15 __version__ = '0.04'
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16 __date__ = '2009-07-28'
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17 __author__ = 'Philippe Lagadec'
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18
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19 #--- LICENSE ------------------------------------------------------------------
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20
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21 # Copyright Philippe Lagadec - see http://www.decalage.info/contact for contact info
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22 #
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23 # This module provides a few classes to easily generate HTML tables and lists.
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24 #
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25 # This software is governed by the CeCILL license under French law and
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26 # abiding by the rules of distribution of free software. You can use,
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27 # modify and/or redistribute the software under the terms of the CeCILL
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28 # license as circulated by CEA, CNRS and INRIA at the following URL
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29 # "http://www.cecill.info".
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30 #
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31 # A copy of the CeCILL license is also provided in these attached files:
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32 # Licence_CeCILL_V2-en.html and Licence_CeCILL_V2-fr.html
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33 #
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34 # As a counterpart to the access to the source code and rights to copy,
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35 # modify and redistribute granted by the license, users are provided only
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36 # with a limited warranty and the software's author, the holder of the
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37 # economic rights, and the successive licensors have only limited
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38 # liability.
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39 #
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40 # In this respect, the user's attention is drawn to the risks associated
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41 # with loading, using, modifying and/or developing or reproducing the
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42 # software by the user in light of its specific status of free software,
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43 # that may mean that it is complicated to manipulate, and that also
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44 # therefore means that it is reserved for developers and experienced
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45 # professionals having in-depth computer knowledge. Users are therefore
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46 # encouraged to load and test the software's suitability as regards their
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47 # requirements in conditions enabling the security of their systems and/or
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48 # data to be ensured and, more generally, to use and operate it in the
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49 # same conditions as regards security.
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50 #
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51 # The fact that you are presently reading this means that you have had
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52 # knowledge of the CeCILL license and that you accept its terms.
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53
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54 #--- THANKS --------------------------------------------------------------------
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55
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56 # - Michal Cernoevic, for the idea of column styles.
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57
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58 #--- REFERENCES ----------------------------------------------------------------
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59
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60 # HTML 4.01 specs: http://www.w3.org/TR/html4/struct/tables.html
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61
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62 # Colors: http://www.w3.org/TR/html4/types.html#type-color
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63
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64 # Columns alignement and style, one of the oldest and trickiest bugs in Mozilla:
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65 # https://bugzilla.mozilla.org/show_bug.cgi?id=915
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66
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67
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68 #--- CONSTANTS -----------------------------------------------------------------
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69
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70 # Table style to get thin black lines in Mozilla/Firefox instead of 3D borders
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71 #TABLE_STYLE_THINBORDER = "border: 1px solid #000000; border-collapse: collapse;"
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72 #TABLE_STYLE_THINBORDER = "border: 1px solid #000000;"
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73
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74
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75 #=== CLASSES ===================================================================
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76
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77 class TableCell (object):
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78 """
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79 a TableCell object is used to create a cell in a HTML table. (TD or TH)
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80
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81 Attributes:
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82 - text: text in the cell (may contain HTML tags). May be any object which
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83 can be converted to a string using str().
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84 - header: bool, false for a normal data cell (TD), true for a header cell (TH)
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85 - bgcolor: str, background color
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86 - width: str, width
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87 - align: str, horizontal alignement (left, center, right, justify or char)
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88 - char: str, alignment character, decimal point if not specified
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89 - charoff: str, see HTML specs
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90 - valign: str, vertical alignment (top|middle|bottom|baseline)
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91 - style: str, CSS style
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92 - attribs: dict, additional attributes for the TD/TH tag
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93
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94 Reference: http://www.w3.org/TR/html4/struct/tables.html#h-11.2.6
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95 """
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96
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97 def __init__(self, text="", bgcolor=None, header=False, width=None,
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98 align=None, char=None, charoff=None, valign=None, style=None,
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99 attribs=None):
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100 """TableCell constructor"""
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101 self.text = text
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102 self.bgcolor = bgcolor
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103 self.header = header
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104 self.width = width
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105 self.align = align
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106 self.char = char
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107 self.charoff = charoff
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108 self.valign = valign
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109 self.style = style
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110 self.attribs = attribs
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111 if attribs==None:
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112 self.attribs = {}
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113
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114 def __str__(self):
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115 """return the HTML code for the table cell as a string"""
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116 attribs_str = ""
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117 if self.bgcolor: self.attribs['bgcolor'] = self.bgcolor
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118 if self.width: self.attribs['width'] = self.width
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119 if self.align: self.attribs['align'] = self.align
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120 if self.char: self.attribs['char'] = self.char
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121 if self.charoff: self.attribs['charoff'] = self.charoff
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122 if self.valign: self.attribs['valign'] = self.valign
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123 if self.style: self.attribs['style'] = self.style
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124 for attr in self.attribs:
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125 attribs_str += ' %s="%s"' % (attr, self.attribs[attr])
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126 if self.text:
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127 text = str(self.text)
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128 else:
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129 # An empty cell should at least contain a non-breaking space
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130 text = ' '
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131 if self.header:
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132 return '<th%s>%s</th>' % (attribs_str, text)
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133 else:
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134 return '<td%s>%s</td>' % (attribs_str, text)
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135
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136 #-------------------------------------------------------------------------------
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137
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138 class TableRow (object):
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139 """
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140 a TableRow object is used to create a row in a HTML table. (TR tag)
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141
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142 Attributes:
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143 - cells: list, tuple or any iterable, containing one string or TableCell
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144 object for each cell
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145 - header: bool, true for a header row (TH), false for a normal data row (TD)
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146 - bgcolor: str, background color
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147 - col_align, col_valign, col_char, col_charoff, col_styles: see Table class
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148 - attribs: dict, additional attributes for the TR tag
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149
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150 Reference: http://www.w3.org/TR/html4/struct/tables.html#h-11.2.5
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151 """
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152
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153 def __init__(self, cells=None, bgcolor=None, header=False, attribs=None,
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154 col_align=None, col_valign=None, col_char=None,
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155 col_charoff=None, col_styles=None):
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156 """TableCell constructor"""
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157 self.bgcolor = bgcolor
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158 self.cells = cells
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159 self.header = header
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160 self.col_align = col_align
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161 self.col_valign = col_valign
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162 self.col_char = col_char
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163 self.col_charoff = col_charoff
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164 self.col_styles = col_styles
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165 self.attribs = attribs
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166 if attribs==None:
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167 self.attribs = {}
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168
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169 def __str__(self):
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170 """return the HTML code for the table row as a string"""
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171 attribs_str = ""
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172 if self.bgcolor: self.attribs['bgcolor'] = self.bgcolor
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173 for attr in self.attribs:
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174 attribs_str += ' %s="%s"' % (attr, self.attribs[attr])
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175 result = '<tr%s>' % attribs_str
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176 for cell in self.cells:
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177 col = self.cells.index(cell) # cell column index
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178 if not isinstance(cell, TableCell):
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179 cell = TableCell(cell, header=self.header)
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180 # apply column alignment if specified:
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181 if self.col_align and cell.align==None:
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182 cell.align = self.col_align[col]
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183 if self.col_char and cell.char==None:
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184 cell.char = self.col_char[col]
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185 if self.col_charoff and cell.charoff==None:
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186 cell.charoff = self.col_charoff[col]
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187 if self.col_valign and cell.valign==None:
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188 cell.valign = self.col_valign[col]
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189 # apply column style if specified:
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190 if self.col_styles and cell.style==None:
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191 cell.style = self.col_styles[col]
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192 result += str(cell)
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193 result += '</tr>\n'
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194 return result
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195
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196 #-------------------------------------------------------------------------------
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197
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198 class Table (object):
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199 """
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200 a Table object is used to create a HTML table. (TABLE tag)
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201
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202 Attributes:
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203 - rows: list, tuple or any iterable, containing one iterable or TableRow
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204 object for each row
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205 - header_row: list, tuple or any iterable, containing the header row (optional)
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206 - border: str or int, border width
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207 - style: str, table style in CSS syntax (thin black borders by default)
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208 - width: str, width of the table on the page
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209 - attribs: dict, additional attributes for the TABLE tag
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210 - col_width: list or tuple defining width for each column
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211 - col_align: list or tuple defining horizontal alignment for each column
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212 - col_char: list or tuple defining alignment character for each column
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213 - col_charoff: list or tuple defining charoff attribute for each column
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214 - col_valign: list or tuple defining vertical alignment for each column
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215 - col_styles: list or tuple of HTML styles for each column
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216
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217 Reference: http://www.w3.org/TR/html4/struct/tables.html#h-11.2.1
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218 """
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219
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220 def __init__(self, rows=None, border='1', style=None, width=None,
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221 cellspacing=None, cellpadding=4, attribs=None, header_row=None,
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222 col_width=None, col_align=None, col_valign=None,
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223 col_char=None, col_charoff=None, col_styles=None):
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224 """TableCell constructor"""
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225 self.border = border
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226 self.style = style
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227 # style for thin borders by default
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228 #if style == None: self.style = TABLE_STYLE_THINBORDER
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229 self.width = width
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230 self.cellspacing = cellspacing
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231 self.cellpadding = cellpadding
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232 self.header_row = header_row
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233 self.rows = rows
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234 if not rows: self.rows = []
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235 self.attribs = attribs
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236 if not attribs: self.attribs = {}
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237 self.col_width = col_width
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238 self.col_align = col_align
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239 self.col_char = col_char
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240 self.col_charoff = col_charoff
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241 self.col_valign = col_valign
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242 self.col_styles = col_styles
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243
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244 def __str__(self):
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245 """return the HTML code for the table as a string"""
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246 attribs_str = ""
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247 #if self.border: self.attribs['border'] = self.border
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248 if self.style: self.attribs['style'] = self.style
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249 if self.width: self.attribs['width'] = self.width
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250 if self.cellspacing: self.attribs['cellspacing'] = self.cellspacing
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251 if self.cellpadding: self.attribs['cellpadding'] = self.cellpadding
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252 for attr in self.attribs:
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253 attribs_str += ' %s="%s"' % (attr, self.attribs[attr])
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254 result = '<table%s>\n' % attribs_str
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255 # insert column tags and attributes if specified:
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256 if self.col_width:
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257 for width in self.col_width:
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258 result += ' <col width="%s">\n' % width
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259 # First insert a header row if specified:
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260 if self.header_row:
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261 if not isinstance(self.header_row, TableRow):
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262 result += str(TableRow(self.header_row, header=True))
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263 else:
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264 result += str(self.header_row)
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265 # Then all data rows:
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266 for row in self.rows:
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267 if not isinstance(row, TableRow):
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268 row = TableRow(row)
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269 # apply column alignments and styles to each row if specified:
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270 # (Mozilla bug workaround)
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271 if self.col_align and not row.col_align:
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272 row.col_align = self.col_align
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273 if self.col_char and not row.col_char:
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274 row.col_char = self.col_char
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275 if self.col_charoff and not row.col_charoff:
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276 row.col_charoff = self.col_charoff
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277 if self.col_valign and not row.col_valign:
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278 row.col_valign = self.col_valign
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279 if self.col_styles and not row.col_styles:
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280 row.col_styles = self.col_styles
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281 result += str(row)
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282 result += '</table>'
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283 return result
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284
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285
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286 #-------------------------------------------------------------------------------
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287
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288 class List (object):
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289 """
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290 a List object is used to create an ordered or unordered list in HTML.
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291 (UL/OL tag)
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292
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293 Attributes:
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294 - lines: list, tuple or any iterable, containing one string for each line
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295 - ordered: bool, choice between an ordered (OL) or unordered list (UL)
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296 - attribs: dict, additional attributes for the OL/UL tag
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297
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298 Reference: http://www.w3.org/TR/html4/struct/lists.html
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299 """
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300
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301 def __init__(self, lines=None, ordered=False, start=None, attribs=None):
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302 """List constructor"""
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303 if lines:
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304 self.lines = lines
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305 else:
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306 self.lines = []
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307 self.ordered = ordered
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308 self.start = start
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309 if attribs:
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310 self.attribs = attribs
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311 else:
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312 self.attribs = {}
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313
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314 def __str__(self):
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315 """return the HTML code for the list as a string"""
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316 attribs_str = ""
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317 if self.start: self.attribs['start'] = self.start
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318 for attr in self.attribs:
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319 attribs_str += ' %s="%s"' % (attr, self.attribs[attr])
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320 if self.ordered: tag = 'ol'
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321 else: tag = 'ul'
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322 result = '<%s%s>\n' % (tag, attribs_str)
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323 for line in self.lines:
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324 result += ' <li>%s\n' % str(line)
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325 result += '</%s>\n' % tag
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326 return result
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327
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328 #=== FUNCTIONS ================================================================
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329
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330 # much simpler definition of a link as a function:
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331 def Link(text, url):
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332 return '<a href="%s">%s</a>' % (url, text)
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333
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334 def link(text, url):
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335 return '<a href="%s">%s</a>' % (url, text)
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336
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337 def table(*args, **kwargs):
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338 'return HTML code for a table as a string. See Table class for parameters.'
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339 return str(Table(*args, **kwargs))
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340
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341 def list(*args, **kwargs):
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342 'return HTML code for a list as a string. See List class for parameters.'
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343 return str(List(*args, **kwargs))
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344
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345
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346 #=== MAIN =====================================================================
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347
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348 # Show sample usage when this file is launched as a script.
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349
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350 if __name__ == '__main__':
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351
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352 # open an HTML file to show output in a browser
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353 f = open('test.html', 'w')
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354
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355 t = Table()
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356 t.rows.append(TableRow(['A', 'B', 'C'], header=True))
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357 t.rows.append(TableRow(['D', 'E', 'F']))
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358 t.rows.append(('i', 'j', 'k'))
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359 f.write(str(t) + '<p>\n')
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360 print (str(t))
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361 f.close()