Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/lxml/builder.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 # cython: language_level=2
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2
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3 #
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4 # Element generator factory by Fredrik Lundh.
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5 #
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6 # Source:
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7 # http://online.effbot.org/2006_11_01_archive.htm#et-builder
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8 # http://effbot.python-hosting.com/file/stuff/sandbox/elementlib/builder.py
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9 #
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10 # --------------------------------------------------------------------
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11 # The ElementTree toolkit is
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12 #
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13 # Copyright (c) 1999-2004 by Fredrik Lundh
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14 #
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15 # By obtaining, using, and/or copying this software and/or its
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16 # associated documentation, you agree that you have read, understood,
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17 # and will comply with the following terms and conditions:
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18 #
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19 # Permission to use, copy, modify, and distribute this software and
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20 # its associated documentation for any purpose and without fee is
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21 # hereby granted, provided that the above copyright notice appears in
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22 # all copies, and that both that copyright notice and this permission
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23 # notice appear in supporting documentation, and that the name of
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24 # Secret Labs AB or the author not be used in advertising or publicity
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25 # pertaining to distribution of the software without specific, written
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26 # prior permission.
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27 #
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28 # SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
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29 # TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
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30 # ABILITY AND FITNESS. IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
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31 # BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
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32 # DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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33 # WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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34 # ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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35 # OF THIS SOFTWARE.
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36 # --------------------------------------------------------------------
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37
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38 """
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39 The ``E`` Element factory for generating XML documents.
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40 """
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41
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42 from __future__ import absolute_import
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43
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44 import lxml.etree as ET
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45
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46 from functools import partial
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47
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48 try:
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49 basestring
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50 except NameError:
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51 basestring = str
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52
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53 try:
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54 unicode
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55 except NameError:
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56 unicode = str
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57
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58
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59 class ElementMaker(object):
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60 """Element generator factory.
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61
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62 Unlike the ordinary Element factory, the E factory allows you to pass in
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63 more than just a tag and some optional attributes; you can also pass in
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64 text and other elements. The text is added as either text or tail
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65 attributes, and elements are inserted at the right spot. Some small
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66 examples::
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67
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68 >>> from lxml import etree as ET
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69 >>> from lxml.builder import E
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70
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71 >>> ET.tostring(E("tag"))
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72 '<tag/>'
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73 >>> ET.tostring(E("tag", "text"))
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74 '<tag>text</tag>'
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75 >>> ET.tostring(E("tag", "text", key="value"))
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76 '<tag key="value">text</tag>'
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77 >>> ET.tostring(E("tag", E("subtag", "text"), "tail"))
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78 '<tag><subtag>text</subtag>tail</tag>'
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79
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80 For simple tags, the factory also allows you to write ``E.tag(...)`` instead
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81 of ``E('tag', ...)``::
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82
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83 >>> ET.tostring(E.tag())
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84 '<tag/>'
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85 >>> ET.tostring(E.tag("text"))
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86 '<tag>text</tag>'
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87 >>> ET.tostring(E.tag(E.subtag("text"), "tail"))
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88 '<tag><subtag>text</subtag>tail</tag>'
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89
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90 Here's a somewhat larger example; this shows how to generate HTML
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91 documents, using a mix of prepared factory functions for inline elements,
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92 nested ``E.tag`` calls, and embedded XHTML fragments::
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93
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94 # some common inline elements
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95 A = E.a
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96 I = E.i
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97 B = E.b
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98
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99 def CLASS(v):
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100 # helper function, 'class' is a reserved word
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101 return {'class': v}
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102
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103 page = (
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104 E.html(
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105 E.head(
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106 E.title("This is a sample document")
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107 ),
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108 E.body(
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109 E.h1("Hello!", CLASS("title")),
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110 E.p("This is a paragraph with ", B("bold"), " text in it!"),
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111 E.p("This is another paragraph, with a ",
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112 A("link", href="http://www.python.org"), "."),
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113 E.p("Here are some reserved characters: <spam&egg>."),
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114 ET.XML("<p>And finally, here is an embedded XHTML fragment.</p>"),
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115 )
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116 )
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117 )
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118
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119 print ET.tostring(page)
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120
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121 Here's a prettyprinted version of the output from the above script::
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122
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123 <html>
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124 <head>
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125 <title>This is a sample document</title>
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126 </head>
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127 <body>
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128 <h1 class="title">Hello!</h1>
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129 <p>This is a paragraph with <b>bold</b> text in it!</p>
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130 <p>This is another paragraph, with <a href="http://www.python.org">link</a>.</p>
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131 <p>Here are some reserved characters: &lt;spam&amp;egg&gt;.</p>
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132 <p>And finally, here is an embedded XHTML fragment.</p>
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133 </body>
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134 </html>
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135
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136 For namespace support, you can pass a namespace map (``nsmap``)
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137 and/or a specific target ``namespace`` to the ElementMaker class::
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138
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139 >>> E = ElementMaker(namespace="http://my.ns/")
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140 >>> print(ET.tostring( E.test ))
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141 <test xmlns="http://my.ns/"/>
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142
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143 >>> E = ElementMaker(namespace="http://my.ns/", nsmap={'p':'http://my.ns/'})
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144 >>> print(ET.tostring( E.test ))
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145 <p:test xmlns:p="http://my.ns/"/>
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146 """
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147
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148 def __init__(self, typemap=None,
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149 namespace=None, nsmap=None, makeelement=None):
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150 if namespace is not None:
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151 self._namespace = '{' + namespace + '}'
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152 else:
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153 self._namespace = None
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154
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155 if nsmap:
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156 self._nsmap = dict(nsmap)
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157 else:
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158 self._nsmap = None
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159
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160 if makeelement is not None:
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161 assert callable(makeelement)
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162 self._makeelement = makeelement
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163 else:
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164 self._makeelement = ET.Element
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165
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166 # initialize type map for this element factory
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167
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168 if typemap:
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169 typemap = dict(typemap)
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170 else:
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171 typemap = {}
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172
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173 def add_text(elem, item):
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174 try:
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175 elem[-1].tail = (elem[-1].tail or "") + item
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176 except IndexError:
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177 elem.text = (elem.text or "") + item
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178
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179 def add_cdata(elem, cdata):
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180 if elem.text:
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181 raise ValueError("Can't add a CDATA section. Element already has some text: %r" % elem.text)
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182 elem.text = cdata
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183
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184 if str not in typemap:
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185 typemap[str] = add_text
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186 if unicode not in typemap:
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187 typemap[unicode] = add_text
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188 if ET.CDATA not in typemap:
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189 typemap[ET.CDATA] = add_cdata
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190
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191 def add_dict(elem, item):
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192 attrib = elem.attrib
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193 for k, v in item.items():
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194 if isinstance(v, basestring):
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195 attrib[k] = v
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196 else:
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197 attrib[k] = typemap[type(v)](None, v)
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198 if dict not in typemap:
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199 typemap[dict] = add_dict
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200
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201 self._typemap = typemap
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202
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203 def __call__(self, tag, *children, **attrib):
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204 typemap = self._typemap
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205
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206 if self._namespace is not None and tag[0] != '{':
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207 tag = self._namespace + tag
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208 elem = self._makeelement(tag, nsmap=self._nsmap)
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209 if attrib:
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210 typemap[dict](elem, attrib)
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211
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212 for item in children:
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213 if callable(item):
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214 item = item()
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215 t = typemap.get(type(item))
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216 if t is None:
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217 if ET.iselement(item):
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218 elem.append(item)
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219 continue
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220 for basetype in type(item).__mro__:
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221 # See if the typemap knows of any of this type's bases.
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222 t = typemap.get(basetype)
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223 if t is not None:
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224 break
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225 else:
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226 raise TypeError("bad argument type: %s(%r)" %
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227 (type(item).__name__, item))
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228 v = t(elem, item)
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229 if v:
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230 typemap.get(type(v))(elem, v)
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231
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232 return elem
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233
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234 def __getattr__(self, tag):
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235 return partial(self, tag)
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236
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237
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238 # create factory object
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239 E = ElementMaker()