Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/lxml/sax.py @ 0:26e78fe6e8c4 draft

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
parents
children
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0
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1 # cython: language_level=2
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2
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3 """
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4 SAX-based adapter to copy trees from/to the Python standard library.
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5
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6 Use the `ElementTreeContentHandler` class to build an ElementTree from
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7 SAX events.
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8
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9 Use the `ElementTreeProducer` class or the `saxify()` function to fire
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10 the SAX events of an ElementTree against a SAX ContentHandler.
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11
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12 See http://codespeak.net/lxml/sax.html
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13 """
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14
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15 from __future__ import absolute_import
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16
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17 from xml.sax.handler import ContentHandler
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18 from lxml import etree
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19 from lxml.etree import ElementTree, SubElement
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20 from lxml.etree import Comment, ProcessingInstruction
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21
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22
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23 class SaxError(etree.LxmlError):
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24 """General SAX error.
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25 """
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26
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27
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28 def _getNsTag(tag):
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29 if tag[0] == '{':
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30 return tuple(tag[1:].split('}', 1))
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31 else:
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32 return None, tag
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33
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34
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35 class ElementTreeContentHandler(ContentHandler):
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36 """Build an lxml ElementTree from SAX events.
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37 """
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38 def __init__(self, makeelement=None):
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39 ContentHandler.__init__(self)
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40 self._root = None
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41 self._root_siblings = []
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42 self._element_stack = []
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43 self._default_ns = None
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44 self._ns_mapping = { None : [None] }
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45 self._new_mappings = {}
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46 if makeelement is None:
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47 makeelement = etree.Element
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48 self._makeelement = makeelement
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49
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50 def _get_etree(self):
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51 "Contains the generated ElementTree after parsing is finished."
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52 return ElementTree(self._root)
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53
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54 etree = property(_get_etree, doc=_get_etree.__doc__)
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55
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56 def setDocumentLocator(self, locator):
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57 pass
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58
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59 def startDocument(self):
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60 pass
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61
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62 def endDocument(self):
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63 pass
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64
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65 def startPrefixMapping(self, prefix, uri):
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66 self._new_mappings[prefix] = uri
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67 try:
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68 self._ns_mapping[prefix].append(uri)
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69 except KeyError:
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70 self._ns_mapping[prefix] = [uri]
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71 if prefix is None:
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72 self._default_ns = uri
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73
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74 def endPrefixMapping(self, prefix):
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75 ns_uri_list = self._ns_mapping[prefix]
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76 ns_uri_list.pop()
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77 if prefix is None:
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78 self._default_ns = ns_uri_list[-1]
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79
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80 def _buildTag(self, ns_name_tuple):
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81 ns_uri, local_name = ns_name_tuple
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82 if ns_uri:
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83 el_tag = "{%s}%s" % ns_name_tuple
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84 elif self._default_ns:
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85 el_tag = "{%s}%s" % (self._default_ns, local_name)
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86 else:
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87 el_tag = local_name
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88 return el_tag
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89
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90 def startElementNS(self, ns_name, qname, attributes=None):
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91 el_name = self._buildTag(ns_name)
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92 if attributes:
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93 attrs = {}
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94 try:
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95 iter_attributes = attributes.iteritems()
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96 except AttributeError:
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97 iter_attributes = attributes.items()
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98
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99 for name_tuple, value in iter_attributes:
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100 if name_tuple[0]:
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101 attr_name = "{%s}%s" % name_tuple
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102 else:
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103 attr_name = name_tuple[1]
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104 attrs[attr_name] = value
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105 else:
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106 attrs = None
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107
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108 element_stack = self._element_stack
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109 if self._root is None:
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110 element = self._root = \
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111 self._makeelement(el_name, attrs, self._new_mappings)
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112 if self._root_siblings and hasattr(element, 'addprevious'):
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113 for sibling in self._root_siblings:
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114 element.addprevious(sibling)
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115 del self._root_siblings[:]
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116 else:
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117 element = SubElement(element_stack[-1], el_name,
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118 attrs, self._new_mappings)
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119 element_stack.append(element)
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120
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121 self._new_mappings.clear()
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122
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123 def processingInstruction(self, target, data):
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124 pi = ProcessingInstruction(target, data)
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125 if self._root is None:
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126 self._root_siblings.append(pi)
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127 else:
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128 self._element_stack[-1].append(pi)
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129
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130 def endElementNS(self, ns_name, qname):
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131 element = self._element_stack.pop()
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132 el_tag = self._buildTag(ns_name)
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133 if el_tag != element.tag:
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134 raise SaxError("Unexpected element closed: " + el_tag)
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135
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136 def startElement(self, name, attributes=None):
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137 if attributes:
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138 attributes = dict(
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139 [((None, k), v) for k, v in attributes.items()]
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140 )
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141 self.startElementNS((None, name), name, attributes)
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142
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143 def endElement(self, name):
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144 self.endElementNS((None, name), name)
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145
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146 def characters(self, data):
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147 last_element = self._element_stack[-1]
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148 try:
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149 # if there already is a child element, we must append to its tail
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150 last_element = last_element[-1]
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151 last_element.tail = (last_element.tail or '') + data
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152 except IndexError:
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153 # otherwise: append to the text
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154 last_element.text = (last_element.text or '') + data
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155
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156 ignorableWhitespace = characters
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157
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158
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159 class ElementTreeProducer(object):
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160 """Produces SAX events for an element and children.
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161 """
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162 def __init__(self, element_or_tree, content_handler):
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163 try:
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164 element = element_or_tree.getroot()
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165 except AttributeError:
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166 element = element_or_tree
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167 self._element = element
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168 self._content_handler = content_handler
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169 from xml.sax.xmlreader import AttributesNSImpl as attr_class
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170 self._attr_class = attr_class
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171 self._empty_attributes = attr_class({}, {})
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172
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173 def saxify(self):
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174 self._content_handler.startDocument()
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175
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176 element = self._element
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177 if hasattr(element, 'getprevious'):
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178 siblings = []
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179 sibling = element.getprevious()
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180 while getattr(sibling, 'tag', None) is ProcessingInstruction:
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181 siblings.append(sibling)
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182 sibling = sibling.getprevious()
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183 for sibling in siblings[::-1]:
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184 self._recursive_saxify(sibling, {})
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185
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186 self._recursive_saxify(element, {})
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187
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188 if hasattr(element, 'getnext'):
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189 sibling = element.getnext()
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190 while getattr(sibling, 'tag', None) is ProcessingInstruction:
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191 self._recursive_saxify(sibling, {})
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192 sibling = sibling.getnext()
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193
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194 self._content_handler.endDocument()
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195
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196 def _recursive_saxify(self, element, parent_nsmap):
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197 content_handler = self._content_handler
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198 tag = element.tag
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199 if tag is Comment or tag is ProcessingInstruction:
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parents:
diff changeset
200 if tag is ProcessingInstruction:
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201 content_handler.processingInstruction(
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parents:
diff changeset
202 element.target, element.text)
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203 tail = element.tail
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diff changeset
204 if tail:
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diff changeset
205 content_handler.characters(tail)
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parents:
diff changeset
206 return
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diff changeset
207
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diff changeset
208 element_nsmap = element.nsmap
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diff changeset
209 new_prefixes = []
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diff changeset
210 if element_nsmap != parent_nsmap:
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parents:
diff changeset
211 # There have been updates to the namespace
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parents:
diff changeset
212 for prefix, ns_uri in element_nsmap.items():
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parents:
diff changeset
213 if parent_nsmap.get(prefix) != ns_uri:
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parents:
diff changeset
214 new_prefixes.append( (prefix, ns_uri) )
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215
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diff changeset
216 attribs = element.items()
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diff changeset
217 if attribs:
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parents:
diff changeset
218 attr_values = {}
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parents:
diff changeset
219 attr_qnames = {}
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parents:
diff changeset
220 for attr_ns_name, value in attribs:
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shellac
parents:
diff changeset
221 attr_ns_tuple = _getNsTag(attr_ns_name)
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parents:
diff changeset
222 attr_values[attr_ns_tuple] = value
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parents:
diff changeset
223 attr_qnames[attr_ns_tuple] = self._build_qname(
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parents:
diff changeset
224 attr_ns_tuple[0], attr_ns_tuple[1], element_nsmap,
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parents:
diff changeset
225 preferred_prefix=None, is_attribute=True)
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parents:
diff changeset
226 sax_attributes = self._attr_class(attr_values, attr_qnames)
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parents:
diff changeset
227 else:
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parents:
diff changeset
228 sax_attributes = self._empty_attributes
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diff changeset
229
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parents:
diff changeset
230 ns_uri, local_name = _getNsTag(tag)
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parents:
diff changeset
231 qname = self._build_qname(
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parents:
diff changeset
232 ns_uri, local_name, element_nsmap, element.prefix, is_attribute=False)
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parents:
diff changeset
233
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parents:
diff changeset
234 for prefix, uri in new_prefixes:
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parents:
diff changeset
235 content_handler.startPrefixMapping(prefix, uri)
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parents:
diff changeset
236 content_handler.startElementNS(
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parents:
diff changeset
237 (ns_uri, local_name), qname, sax_attributes)
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parents:
diff changeset
238 text = element.text
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diff changeset
239 if text:
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parents:
diff changeset
240 content_handler.characters(text)
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parents:
diff changeset
241 for child in element:
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parents:
diff changeset
242 self._recursive_saxify(child, element_nsmap)
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parents:
diff changeset
243 content_handler.endElementNS((ns_uri, local_name), qname)
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shellac
parents:
diff changeset
244 for prefix, uri in new_prefixes:
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shellac
parents:
diff changeset
245 content_handler.endPrefixMapping(prefix)
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parents:
diff changeset
246 tail = element.tail
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parents:
diff changeset
247 if tail:
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parents:
diff changeset
248 content_handler.characters(tail)
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parents:
diff changeset
249
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parents:
diff changeset
250 def _build_qname(self, ns_uri, local_name, nsmap, preferred_prefix, is_attribute):
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parents:
diff changeset
251 if ns_uri is None:
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parents:
diff changeset
252 return local_name
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parents:
diff changeset
253
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parents:
diff changeset
254 if not is_attribute and nsmap.get(preferred_prefix) == ns_uri:
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parents:
diff changeset
255 prefix = preferred_prefix
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parents:
diff changeset
256 else:
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parents:
diff changeset
257 # Pick the first matching prefix, in alphabetical order.
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258 candidates = [
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259 pfx for (pfx, uri) in nsmap.items()
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260 if pfx is not None and uri == ns_uri
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261 ]
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262 prefix = (
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263 candidates[0] if len(candidates) == 1
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264 else min(candidates) if candidates
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265 else None
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266 )
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267
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268 if prefix is None:
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269 # Default namespace
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270 return local_name
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271 return prefix + ':' + local_name
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272
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273
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274 def saxify(element_or_tree, content_handler):
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275 """One-shot helper to generate SAX events from an XML tree and fire
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276 them against a SAX ContentHandler.
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277 """
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278 return ElementTreeProducer(element_or_tree, content_handler).saxify()