Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/lxml/_elementpath.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 # ElementTree
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5 # $Id: ElementPath.py 3375 2008-02-13 08:05:08Z fredrik $
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6 #
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7 # limited xpath support for element trees
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8 #
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9 # history:
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10 # 2003-05-23 fl created
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11 # 2003-05-28 fl added support for // etc
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12 # 2003-08-27 fl fixed parsing of periods in element names
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13 # 2007-09-10 fl new selection engine
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14 # 2007-09-12 fl fixed parent selector
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15 # 2007-09-13 fl added iterfind; changed findall to return a list
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16 # 2007-11-30 fl added namespaces support
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17 # 2009-10-30 fl added child element value filter
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18 #
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19 # Copyright (c) 2003-2009 by Fredrik Lundh. All rights reserved.
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20 #
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21 # fredrik@pythonware.com
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22 # http://www.pythonware.com
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23 #
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24 # --------------------------------------------------------------------
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25 # The ElementTree toolkit is
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26 #
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27 # Copyright (c) 1999-2009 by Fredrik Lundh
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28 #
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29 # By obtaining, using, and/or copying this software and/or its
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30 # associated documentation, you agree that you have read, understood,
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31 # and will comply with the following terms and conditions:
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32 #
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33 # Permission to use, copy, modify, and distribute this software and
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34 # its associated documentation for any purpose and without fee is
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35 # hereby granted, provided that the above copyright notice appears in
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36 # all copies, and that both that copyright notice and this permission
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37 # notice appear in supporting documentation, and that the name of
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38 # Secret Labs AB or the author not be used in advertising or publicity
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39 # pertaining to distribution of the software without specific, written
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40 # prior permission.
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41 #
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42 # SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
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43 # TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
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44 # ABILITY AND FITNESS. IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
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45 # BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
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46 # DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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47 # WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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48 # ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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49 # OF THIS SOFTWARE.
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50 # --------------------------------------------------------------------
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51
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52 ##
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53 # Implementation module for XPath support. There's usually no reason
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54 # to import this module directly; the <b>ElementTree</b> does this for
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55 # you, if needed.
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56 ##
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57
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58 from __future__ import absolute_import
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59
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60 import re
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61
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62 xpath_tokenizer_re = re.compile(
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63 "("
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64 "'[^']*'|\"[^\"]*\"|"
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65 "::|"
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66 "//?|"
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67 r"\.\.|"
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68 r"\(\)|"
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69 r"[/.*:\[\]\(\)@=])|"
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70 r"((?:\{[^}]+\})?[^/\[\]\(\)@=\s]+)|"
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71 r"\s+"
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72 )
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73
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74 def xpath_tokenizer(pattern, namespaces=None):
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75 # ElementTree uses '', lxml used None originally.
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76 default_namespace = (namespaces.get(None) or namespaces.get('')) if namespaces else None
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77 parsing_attribute = False
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78 for token in xpath_tokenizer_re.findall(pattern):
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79 ttype, tag = token
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80 if tag and tag[0] != "{":
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81 if ":" in tag:
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82 prefix, uri = tag.split(":", 1)
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83 try:
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84 if not namespaces:
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85 raise KeyError
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86 yield ttype, "{%s}%s" % (namespaces[prefix], uri)
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87 except KeyError:
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88 raise SyntaxError("prefix %r not found in prefix map" % prefix)
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89 elif default_namespace and not parsing_attribute:
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90 yield ttype, "{%s}%s" % (default_namespace, tag)
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91 else:
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92 yield token
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93 parsing_attribute = False
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94 else:
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95 yield token
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96 parsing_attribute = ttype == '@'
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97
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98
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99 def prepare_child(next, token):
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100 tag = token[1]
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101 def select(result):
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102 for elem in result:
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103 for e in elem.iterchildren(tag):
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104 yield e
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105 return select
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106
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107 def prepare_star(next, token):
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108 def select(result):
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109 for elem in result:
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110 for e in elem.iterchildren('*'):
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111 yield e
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112 return select
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113
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114 def prepare_self(next, token):
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115 def select(result):
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116 return result
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117 return select
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118
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119 def prepare_descendant(next, token):
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120 token = next()
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121 if token[0] == "*":
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122 tag = "*"
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123 elif not token[0]:
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124 tag = token[1]
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125 else:
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126 raise SyntaxError("invalid descendant")
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127 def select(result):
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128 for elem in result:
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guerler
parents:
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129 for e in elem.iterdescendants(tag):
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guerler
parents:
diff changeset
130 yield e
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guerler
parents:
diff changeset
131 return select
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guerler
parents:
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132
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parents:
diff changeset
133 def prepare_parent(next, token):
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guerler
parents:
diff changeset
134 def select(result):
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guerler
parents:
diff changeset
135 for elem in result:
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parents:
diff changeset
136 parent = elem.getparent()
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guerler
parents:
diff changeset
137 if parent is not None:
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guerler
parents:
diff changeset
138 yield parent
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guerler
parents:
diff changeset
139 return select
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guerler
parents:
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140
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parents:
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141 def prepare_predicate(next, token):
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guerler
parents:
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142 # FIXME: replace with real parser!!! refs:
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parents:
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143 # http://effbot.org/zone/simple-iterator-parser.htm
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parents:
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144 # http://javascript.crockford.com/tdop/tdop.html
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145 signature = ''
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146 predicate = []
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parents:
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147 while 1:
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parents:
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148 token = next()
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parents:
diff changeset
149 if token[0] == "]":
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parents:
diff changeset
150 break
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parents:
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151 if token == ('', ''):
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guerler
parents:
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152 # ignore whitespace
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153 continue
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parents:
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154 if token[0] and token[0][:1] in "'\"":
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155 token = "'", token[0][1:-1]
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parents:
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156 signature += token[0] or "-"
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157 predicate.append(token[1])
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158
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159 # use signature to determine predicate type
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parents:
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160 if signature == "@-":
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161 # [@attribute] predicate
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162 key = predicate[1]
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163 def select(result):
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164 for elem in result:
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165 if elem.get(key) is not None:
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166 yield elem
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167 return select
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parents:
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168 if signature == "@-='":
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169 # [@attribute='value']
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170 key = predicate[1]
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171 value = predicate[-1]
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172 def select(result):
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173 for elem in result:
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parents:
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174 if elem.get(key) == value:
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parents:
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175 yield elem
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176 return select
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parents:
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177 if signature == "-" and not re.match(r"-?\d+$", predicate[0]):
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178 # [tag]
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179 tag = predicate[0]
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180 def select(result):
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181 for elem in result:
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182 for _ in elem.iterchildren(tag):
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parents:
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183 yield elem
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184 break
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185 return select
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186 if signature == ".='" or (signature == "-='" and not re.match(r"-?\d+$", predicate[0])):
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187 # [.='value'] or [tag='value']
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188 tag = predicate[0]
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189 value = predicate[-1]
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190 if tag:
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191 def select(result):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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192 for elem in result:
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193 for e in elem.iterchildren(tag):
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194 if "".join(e.itertext()) == value:
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195 yield elem
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196 break
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parents:
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197 else:
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198 def select(result):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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199 for elem in result:
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200 if "".join(elem.itertext()) == value:
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parents:
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201 yield elem
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202 return select
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guerler
parents:
diff changeset
203 if signature == "-" or signature == "-()" or signature == "-()-":
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parents:
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204 # [index] or [last()] or [last()-index]
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guerler
parents:
diff changeset
205 if signature == "-":
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parents:
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206 # [index]
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207 index = int(predicate[0]) - 1
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guerler
parents:
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208 if index < 0:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
209 if index == -1:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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210 raise SyntaxError(
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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211 "indices in path predicates are 1-based, not 0-based")
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212 else:
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213 raise SyntaxError("path index >= 1 expected")
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214 else:
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parents:
diff changeset
215 if predicate[0] != "last":
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parents:
diff changeset
216 raise SyntaxError("unsupported function")
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
217 if signature == "-()-":
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guerler
parents:
diff changeset
218 try:
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219 index = int(predicate[2]) - 1
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guerler
parents:
diff changeset
220 except ValueError:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
221 raise SyntaxError("unsupported expression")
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guerler
parents:
diff changeset
222 else:
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223 index = -1
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224 def select(result):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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225 for elem in result:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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226 parent = elem.getparent()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
227 if parent is None:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
228 continue
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
229 try:
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230 # FIXME: what if the selector is "*" ?
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guerler
parents:
diff changeset
231 elems = list(parent.iterchildren(elem.tag))
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guerler
parents:
diff changeset
232 if elems[index] is elem:
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guerler
parents:
diff changeset
233 yield elem
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
234 except IndexError:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
235 pass
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
236 return select
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
237 raise SyntaxError("invalid predicate")
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guerler
parents:
diff changeset
238
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parents:
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239 ops = {
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240 "": prepare_child,
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guerler
parents:
diff changeset
241 "*": prepare_star,
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guerler
parents:
diff changeset
242 ".": prepare_self,
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guerler
parents:
diff changeset
243 "..": prepare_parent,
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guerler
parents:
diff changeset
244 "//": prepare_descendant,
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guerler
parents:
diff changeset
245 "[": prepare_predicate,
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guerler
parents:
diff changeset
246 }
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guerler
parents:
diff changeset
247
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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248
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
249 # --------------------------------------------------------------------
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guerler
parents:
diff changeset
250
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guerler
parents:
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251 _cache = {}
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guerler
parents:
diff changeset
252
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guerler
parents:
diff changeset
253
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
254 def _build_path_iterator(path, namespaces):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
255 """compile selector pattern"""
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guerler
parents:
diff changeset
256 if path[-1:] == "/":
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guerler
parents:
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257 path += "*" # implicit all (FIXME: keep this?)
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guerler
parents:
diff changeset
258
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guerler
parents:
diff changeset
259 cache_key = (path,)
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guerler
parents:
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260 if namespaces:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
261 # lxml originally used None for the default namespace but ElementTree uses the
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262 # more convenient (all-strings-dict) empty string, so we support both here,
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263 # preferring the more convenient '', as long as they aren't ambiguous.
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264 if None in namespaces:
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265 if '' in namespaces and namespaces[None] != namespaces['']:
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266 raise ValueError("Ambiguous default namespace provided: %r versus %r" % (
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267 namespaces[None], namespaces['']))
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268 cache_key += (namespaces[None],) + tuple(sorted(
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269 item for item in namespaces.items() if item[0] is not None))
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270 else:
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271 cache_key += tuple(sorted(namespaces.items()))
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272
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273 try:
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274 return _cache[cache_key]
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275 except KeyError:
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276 pass
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277 if len(_cache) > 100:
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278 _cache.clear()
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279
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280 if path[:1] == "/":
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281 raise SyntaxError("cannot use absolute path on element")
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282 stream = iter(xpath_tokenizer(path, namespaces))
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283 try:
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284 _next = stream.next
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285 except AttributeError:
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286 # Python 3
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287 _next = stream.__next__
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288 try:
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289 token = _next()
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290 except StopIteration:
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291 raise SyntaxError("empty path expression")
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292 selector = []
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293 while 1:
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294 try:
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295 selector.append(ops[token[0]](_next, token))
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296 except StopIteration:
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297 raise SyntaxError("invalid path")
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298 try:
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299 token = _next()
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300 if token[0] == "/":
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301 token = _next()
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302 except StopIteration:
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303 break
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304 _cache[cache_key] = selector
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305 return selector
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306
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307
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308 ##
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309 # Iterate over the matching nodes
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310
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311 def iterfind(elem, path, namespaces=None):
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312 selector = _build_path_iterator(path, namespaces)
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313 result = iter((elem,))
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314 for select in selector:
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315 result = select(result)
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316 return result
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317
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318
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319 ##
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320 # Find first matching object.
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321
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322 def find(elem, path, namespaces=None):
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323 it = iterfind(elem, path, namespaces)
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324 try:
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325 return next(it)
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326 except StopIteration:
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327 return None
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328
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329
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330 ##
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331 # Find all matching objects.
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332
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333 def findall(elem, path, namespaces=None):
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334 return list(iterfind(elem, path, namespaces))
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335
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336
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337 ##
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338 # Find text for first matching object.
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339
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340 def findtext(elem, path, default=None, namespaces=None):
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341 el = find(elem, path, namespaces)
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342 if el is None:
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343 return default
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344 else:
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345 return el.text or ''