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annotate planemo/lib/python3.7/site-packages/rdflib/plugins/parsers/pyMicrodata/utils.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 # -*- coding: utf-8 -*-
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2 """
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3 Various utilities for pyMicrodata
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4
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5 @organization: U{World Wide Web Consortium<http://www.w3.org>}
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6 @author: U{Ivan Herman<a href="http://www.w3.org/People/Ivan/">}
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7 @license: This software is available for use under the
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8 U{W3C® SOFTWARE NOTICE AND LICENSE<href="http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231">}
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9 """
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10
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11 """
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12 $Id: utils.py,v 1.7 2012/09/01 15:17:28 ivan Exp $
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13 $Date: 2012/09/01 15:17:28 $
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14 """
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15 import os, os.path, sys
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16 (py_v_major, py_v_minor, py_v_micro, py_v_final, py_v_serial) = sys.version_info
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17
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18 if py_v_major >= 3 :
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19 from urllib.request import Request, urlopen
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20 from urllib.parse import urljoin, quote, urlparse
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21 from http.server import BaseHTTPRequestHandler
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22 from urllib.error import HTTPError as urllib_HTTPError
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23 else :
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24 from urllib.request import Request, urlopen
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25 from urllib.error import HTTPError as urllib_HTTPError
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26 from urllib.parse import urljoin, urlparse
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27 from urllib.parse import quote
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28 from http.server import BaseHTTPRequestHandler
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29
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30 import re
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31 from datetime import datetime
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32
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33 from rdflib import BNode
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34 import rdflib
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35 if rdflib.__version__ >= "3.0.0" :
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36 from rdflib import RDF as ns_rdf
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37 else :
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38 from rdflib.RDF import RDFNS as ns_rdf
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39
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40 #################################################################################
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41 def is_absolute_URI( uri ) :
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42 return urlparse(uri)[0] != ""
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43
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44 #################################################################################
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45
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46 def fragment_escape( name ) :
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47 return quote(name, '/~:-.')
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48
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49 #################################################################################
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50
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51 def generate_URI(base, v) :
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52 """
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53 Generate an (absolute) URI; if val is a fragment, then using it with base,
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54 otherwise just return the value
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55 @param base: Absolute URI for base
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56 @param v: relative or absolute URI
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57 """
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58 if is_absolute_URI( v ) :
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59 return v
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60 else :
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61 # UGLY!!! There is a bug for a corner case in python version <= 2.5.X
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62 if len(v) > 0 and v[0] == '?' and (py_v_major < 3 and py_v_minor <= 5) :
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63 return base+val
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64 ####
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65
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66 # Trust the python library...
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67 # Well, not quite:-) there is what is, in my view, a bug in the urljoin; in some cases it
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68 # swallows the '#' or '?' character at the end. This is clearly a problem with
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69 # Semantic Web URI-s
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70 v = fragment_escape(v.strip())
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71 joined = urljoin(base, v)
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72 try :
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73 if v[-1] != joined[-1] and (v[-1] == "#" or v[-1] == "?") :
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74 return joined + v[-1]
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75 else :
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76 return joined
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77 except :
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78 return joined
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79
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80 #################################################################################
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81 def generate_RDF_collection( graph, vals ) :
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82 """
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83 Generate an RDF List from vals, returns the head of the list
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84 @param graph: RDF graph
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85 @type graph: RDFLib Graph
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86 @param vals: array of RDF Resources
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87 @return: head of the List (an RDF Resource)
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88 """
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89 # generate an RDF List, returns the head
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90 # list has all the elements in RDF format already
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91 heads = [ BNode() for r in vals ] + [ ns_rdf["nil"] ]
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92 for i in range(0, len(vals)) :
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93 graph.add( (heads[i], ns_rdf["first"], vals[i]) )
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94 graph.add( (heads[i], ns_rdf["rest"], heads[i+1]) )
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95 return heads[0]
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96
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97 #################################################################################
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98 def get_Literal(Pnode):
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99 """
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100 Get (recursively) the full text from a DOM Node.
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101
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102 @param Pnode: DOM Node
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103 @return: string
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104 """
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105 rc = ""
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106 for node in Pnode.childNodes:
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107 if node.nodeType == node.TEXT_NODE:
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108 rc = rc + node.data
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109 elif node.nodeType == node.ELEMENT_NODE :
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110 rc = rc + get_Literal(node)
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111
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112 # This presupposes that all spaces and such should be stripped. I am not sure it is true in the spec,
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113 # but this is what the examples show
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114 # return re.sub(r'(\r| |\n|\t)+'," ",rc).strip()
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115
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116 # at present, the agreement seems to say that white spaces are maintained:
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117 return rc
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118
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119 #################################################################################
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120 def get_lang(node) :
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121 # we may have lang and xml:lang
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122 retval = None
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123 if node.hasAttribute("lang") :
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124 retval = node.getAttribute("lang")
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125 if retval and node.hasAttribute("xml:lang") :
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126 xmllang = node.getAttribute("xml:lang").lower()
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127 if not( xmllang != None and xmllang == retval.lower() ) :
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128 # This is an error, in which case retval must be invalidated...
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129 retval = None
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130 return retval
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131
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132 def get_lang_from_hierarchy(document, node) :
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133 lang = get_lang(node)
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134 if lang == None :
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135 parent = node.parentNode
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136 if parent != None and parent != document :
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137 return get_lang_from_hierarchy(document, parent)
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138 else :
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139 return get_lang(document)
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140 else :
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141 return lang
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142
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143 #################################################################################
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144 datetime_type = "http://www.w3.org/2001/XMLSchema#dateTime"
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145 time_type = "http://www.w3.org/2001/XMLSchema#time"
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146 date_type = "http://www.w3.org/2001/XMLSchema#date"
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147 date_gYear = "http://www.w3.org/2001/XMLSchema#gYear"
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148 date_gYearMonth = "http://www.w3.org/2001/XMLSchema#gYearMonth"
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149 date_gMonthDay = "http://www.w3.org/2001/XMLSchema#gMonthDay"
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150 duration_type = "http://www.w3.org/2001/XMLSchema#duration"
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151
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152 _formats = {
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153 date_gMonthDay : [ "%m-%d" ],
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154 date_gYearMonth : [ "%Y-%m"],
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155 date_gYear : [ "%Y" ],
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156 date_type : [ "%Y-%m-%d", "%Y-%m-%dZ" ],
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157 time_type : [ "%H:%M",
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158 "%H:%M:%S",
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159 "%H:%M:%SZ",
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160 "%H:%M:%S.%f" ],
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161 datetime_type : [ "%Y-%m-%dT%H:%M",
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162 "%Y-%m-%dT%H:%M:%S",
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163 "%Y-%m-%dT%H:%M:%S.%f",
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164 "%Y-%m-%dT%H:%MZ",
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165 "%Y-%m-%dT%H:%M:%SZ",
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166 "%Y-%m-%dT%H:%M:%S.%fZ" ],
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167 duration_type : [ "P%dD",
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168 "P%YY%mM%dD",
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diff changeset
169 "P%YY%mM",
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diff changeset
170 "P%YY%dD",
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diff changeset
171 "P%YY",
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diff changeset
172 "P%mM",
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diff changeset
173 "P%mM%dD",
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174 ],
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175 }
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176
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177 _dur_times = [ "%HH%MM%SS", "%HH", "%MM", "%SS", "%HH%MM", "%HH%SS", "%MM%SS" ]
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178
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179 def get_time_type(string) :
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180 """
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181 Check whether the string abides to one of the accepted time related datatypes, and returns that one if yes
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182 @param string: the attribute value to be checked
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183 @return : a datatype URI or None
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184 """
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185 for key in _formats :
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186 for format in _formats[key] :
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diff changeset
187 try :
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188 # try to check if the syntax is fine
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189 d = datetime.strptime(string, format)
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190 # bingo!
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191 return key
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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192 except ValueError :
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193 pass
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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194
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195 # Now come the special cases:-(
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196 # Check first for the duration stuff, that is the nastiest.
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197 if len(string) > 2 and string[0] == 'P' or (string [0] == '-' and string[1] == 'P') :
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198 # this is meant to be a duration type
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199 # first of all, get rid of the leading '-' and check again
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diff changeset
200 if string[0] == '-' :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
201 for format in _formats[duration_type] :
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parents:
diff changeset
202 try :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
203 # try to check if the syntax is fine
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204 d = datetime.strptime(string, format)
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diff changeset
205 # bingo!
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206 return duration_type
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
207 except ValueError :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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208 pass
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
209 # Let us see if the value contains a separate time portion, and cut that one
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210 durs = string.split('T')
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
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diff changeset
211 if len(durs) == 2 :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
212 # yep, so we should check again
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213 dur = durs[0]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
214 tm = durs[1]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
215 # Check the duration part
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216 td = False
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diff changeset
217 for format in _formats[duration_type] :
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guerler
parents:
diff changeset
218 try :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
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diff changeset
219 # try to check if the syntax is fine
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diff changeset
220 d = datetime.strptime(dur, format)
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diff changeset
221 # bingo!
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
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diff changeset
222 td = True
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
223 break
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
224 except ValueError :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
225 pass
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
226 if td == True :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
227 # Getting there...
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guerler
parents:
diff changeset
228 for format in _dur_times :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
229 try :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
230 # try to check if the syntax is fine
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guerler
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diff changeset
231 d = datetime.strptime(tm, format)
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guerler
parents:
diff changeset
232 # bingo!
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
233 return duration_type
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
234 except ValueError :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
235 pass
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
236 # something went wrong...
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
237 return None
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
238 else :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
239 # Well, no more tricks, this is a plain type
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240 return None
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
241
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
242 # If we got here, we should check the time zone
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parents:
diff changeset
243 # there is a discrepancy betwen the python and the HTML5/XSD lexical string,
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guerler
parents:
diff changeset
244 # which means that this has to handled separately for the date and the timezone portion
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guerler
parents:
diff changeset
245 try :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
246 # The time-zone-less portion of the string
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guerler
parents:
diff changeset
247 str = string[0:-6]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
248 # The time-zone portion
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
249 tz = string[-5:]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
250 try :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
251 t = datetime.strptime(tz,"%H:%M")
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
252 except ValueError :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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253 # Bummer, this is not a correct time
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254 return None
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255 # The time-zone is fine, the datetime portion has to be checked
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256 for format in _formats[datetime_type] :
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257 try :
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258 # try to check if it is fine
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259 d = datetime.strptime(str, format)
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260 # Bingo!
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261 return datetime_type
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262 except ValueError :
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263 pass
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264 except :
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265 pass
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266 return None
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267
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268
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269 #########################################################################################################
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270 # Handling URIs
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271 class URIOpener :
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272 """A wrapper around the urllib2 method to open a resource. Beyond accessing the data itself, the class
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273 sets the content location.
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274 The class also adds an accept header to the outgoing request, namely
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275 text/html and application/xhtml+xml (unless set explicitly by the caller).
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276
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277 @ivar data: the real data, ie, a file-like object
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278 @ivar headers: the return headers as sent back by the server
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279 @ivar location: the real location of the data (ie, after possible redirection and content negotiation)
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280 """
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281 CONTENT_LOCATION = 'Content-Location'
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282 def __init__(self, name) :
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283 """
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284 @param name: URL to be opened
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285 @keyword additional_headers: additional HTTP request headers to be added to the call
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286 """
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287 try :
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288 # Note the removal of the fragment ID. This is necessary, per the HTTP spec
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289 req = Request(url=name.split('#')[0])
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290
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291 req.add_header('Accept', 'text/html, application/xhtml+xml')
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292
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293 self.data = urlopen(req)
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294 self.headers = self.data.info()
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295
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296 if URIOpener.CONTENT_LOCATION in self.headers :
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297 self.location = urljoin(self.data.geturl(),self.headers[URIOpener.CONTENT_LOCATION])
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298 else :
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299 self.location = name
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300
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301 except urllib_HTTPError :
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302 e = sys.exc_info()[1]
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303 from pyMicrodata import HTTPError
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304 msg = BaseHTTPRequestHandler.responses[e.code]
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305 raise HTTPError('%s' % msg[1], e.code)
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306 except Exception :
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307 e = sys.exc_info()[1]
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308 from pyMicrodata import MicrodataError
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309 raise MicrodataError('%s' % e)
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310