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annotate planemo/lib/python3.7/site-packages/rdflib/plugins/parsers/pyRdfa/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 pyRdfa.
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4
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5 Most of the utilities are straightforward.
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6
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7 @organization: U{World Wide Web Consortium<http://www.w3.org>}
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8 @author: U{Ivan Herman<a href="http://www.w3.org/People/Ivan/">}
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9 @license: This software is available for use under the
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10 U{W3C® SOFTWARE NOTICE AND LICENSE<href="http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231">}
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11
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12
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13 """
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14
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15 """
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16 $Id: utils.py,v 1.9 2012/11/16 17:51:53 ivan Exp $
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17 $Date: 2012/11/16 17:51:53 $
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18 """
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19 import os, os.path, sys, imp, datetime
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20
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21 # Python 3 vs. 2 switch
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22 if sys.version_info[0] >= 3 :
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23 from urllib.request import Request, urlopen
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24 from urllib.parse import urljoin, quote
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25 from http.server import BaseHTTPRequestHandler
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26 from urllib.error import HTTPError as urllib_HTTPError
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27 else :
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28 from urllib.request import Request, urlopen
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29 from urllib.error import HTTPError as urllib_HTTPError
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30 from urllib.parse import urljoin
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31 from urllib.parse import quote
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32 from http.server import BaseHTTPRequestHandler
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33
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34 from .extras.httpheader import content_type, parse_http_datetime
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35
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36 import rdflib
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37 if rdflib.__version__ >= "3.0.0" :
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38 from rdflib import RDF as ns_rdf
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39 else :
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40 from rdflib.RDF import RDFNS as ns_rdf
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41
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42 from .host import HostLanguage, preferred_suffixes
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43
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44 #########################################################################################################
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45 # Handling URIs
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46 class URIOpener :
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47 """A wrapper around the urllib2 method to open a resource. Beyond accessing the data itself, the class
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48 sets a number of instance variable that might be relevant for processing.
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49 The class also adds an accept header to the outgoing request, namely
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50 text/html and application/xhtml+xml (unless set explicitly by the caller).
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51
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52 If the content type is set by the server, the relevant HTTP response field is used. Otherwise,
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53 common suffixes are used (see L{host.preferred_suffixes}) to set the content type (this is really of importance
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54 for C{file:///} URI-s). If none of these works, the content type is empty.
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55
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56 Interpretation of the content type for the return is done by Deron Meranda's U{httpheader module<http://deron.meranda.us/>}.
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57
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58 @ivar data: the real data, ie, a file-like object
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59 @ivar headers: the return headers as sent back by the server
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60 @ivar content_type: the content type of the resource or the empty string, if the content type cannot be determined
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61 @ivar location: the real location of the data (ie, after possible redirection and content negotiation)
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62 @ivar last_modified_date: sets the last modified date if set in the header, None otherwise
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63 @ivar expiration_date: sets the expiration date if set in the header, I{current UTC plus one day} otherwise (this is used for caching purposes, hence this artificial setting)
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64 """
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65 CONTENT_LOCATION = 'Content-Location'
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66 CONTENT_TYPE = 'Content-Type'
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67 LAST_MODIFIED = 'Last-Modified'
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68 EXPIRES = 'Expires'
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69 def __init__(self, name, additional_headers = {}) :
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70 """
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71 @param name: URL to be opened
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72 @keyword additional_headers: additional HTTP request headers to be added to the call
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73 """
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74 try :
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75 # Note the removal of the fragment ID. This is necessary, per the HTTP spec
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76 req = Request(url=name.split('#')[0])
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77
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78 for key in additional_headers :
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79 req.add_header(key, additional_headers[key])
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80 if 'Accept' not in additional_headers :
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81 req.add_header('Accept', 'text/html, application/xhtml+xml')
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82
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83 self.data = urlopen(req)
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84 self.headers = self.data.info()
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85
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86 if URIOpener.CONTENT_TYPE in self.headers :
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87 # The call below will remove the possible media type parameters, like charset settings
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88 ct = content_type(self.headers[URIOpener.CONTENT_TYPE])
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89 self.content_type = ct.media_type
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90 if 'charset' in ct.parmdict :
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91 self.charset = ct.parmdict['charset']
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92 else :
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93 self.charset = None
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94 # print
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95 else :
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96 # check if the suffix can be used for the content type; this may be important
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97 # for file:// type URI or if the server is not properly set up to return the right
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98 # mime type
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99 self.charset = None
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100 self.content_type = ""
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101 for suffix in list(preferred_suffixes.keys()) :
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102 if name.endswith(suffix) :
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103 self.content_type = preferred_suffixes[suffix]
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104 break
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105
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106 if URIOpener.CONTENT_LOCATION in self.headers :
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107 self.location = urljoin(self.data.geturl(),self.headers[URIOpener.CONTENT_LOCATION])
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108 else :
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109 self.location = name
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110
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111 self.expiration_date = datetime.datetime.utcnow() + datetime.timedelta(days=1)
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112 if URIOpener.EXPIRES in self.headers :
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113 try :
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114 # Thanks to Deron Meranda for the HTTP date conversion method...
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115 self.expiration_date = parse_http_datetime(self.headers[URIOpener.EXPIRES])
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116 except :
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117 # The Expires date format was wrong, sorry, forget it...
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118 pass
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119
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120 self.last_modified_date = None
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121 if URIOpener.LAST_MODIFIED in self.headers :
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122 try :
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123 # Thanks to Deron Meranda for the HTTP date conversion method...
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124 self.last_modified_date = parse_http_datetime(self.headers[URIOpener.LAST_MODIFIED])
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125 except :
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126 # The last modified date format was wrong, sorry, forget it...
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127 pass
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128
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129 except urllib_HTTPError :
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130 e = sys.exc_info()[1]
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131 from . import HTTPError
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132 msg = BaseHTTPRequestHandler.responses[e.code]
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133 raise HTTPError('%s' % msg[1], e.code)
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134 except Exception :
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135 e = sys.exc_info()[1]
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136 from . import RDFaError
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137 raise RDFaError('%s' % e)
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138
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139 #########################################################################################################
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140
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141 # 'safe' characters for the URI quoting, ie, characters that can safely stay as they are. Other
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142 # special characters are converted to their %.. equivalents for namespace prefixes
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143 _unquotedChars = ':/\?=#~'
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144 _warnChars = [' ','\n','\r','\t']
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145
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146 def quote_URI(uri, options = None) :
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147 """
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148 'quote' a URI, ie, exchange special characters for their '%..' equivalents. Some of the characters
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149 may stay as they are (listed in L{_unquotedChars}. If one of the characters listed in L{_warnChars}
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150 is also in the uri, an extra warning is also generated.
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151 @param uri: URI
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152 @param options:
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153 @type options: L{Options<pyRdfa.Options>}
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154 """
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155 from . import err_unusual_char_in_URI
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156 suri = uri.strip()
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157 for c in _warnChars :
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158 if suri.find(c) != -1 :
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159 if options != None :
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160 options.add_warning(err_unusual_char_in_URI % suri)
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161 break
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162 return quote(suri, _unquotedChars)
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163
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164 #########################################################################################################
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165
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166 def create_file_name(uri) :
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167 """
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168 Create a suitable file name from an (absolute) URI. Used, eg, for the generation of a file name for a cached vocabulary file.
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169 """
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170 suri = uri.strip()
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171 final_uri = quote(suri,_unquotedChars)
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172 # Remove some potentially dangereous characters
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173 return final_uri.replace(' ','_').replace('%','_').replace('-','_').replace('+','_').replace('/','_').replace('?','_').replace(':','_').replace('=','_').replace('#','_')
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174
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175 #########################################################################################################
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176 def has_one_of_attributes(node,*args) :
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177 """
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178 Check whether one of the listed attributes is present on a (DOM) node.
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179 @param node: DOM element node
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180 @param args: possible attribute names
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181 @return: True or False
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182 @rtype: Boolean
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183 """
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184 if len(args) == 0 :
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185 return None
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186 if isinstance(args[0], tuple) or isinstance(args[0], list) :
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187 rargs = args[0]
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188 else :
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189 rargs = args
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190
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191 return True in [ node.hasAttribute(attr) for attr in rargs ]
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192
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193 #########################################################################################################
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194 def traverse_tree(node, func) :
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195 """Traverse the whole element tree, and perform the function C{func} on all the elements.
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196 @param node: DOM element node
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197 @param func: function to be called on the node. Input parameter is a DOM Element Node. If the function returns a boolean True, the recursion is stopped.
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198 """
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199 if func(node) :
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200 return
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201
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202 for n in node.childNodes :
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203 if n.nodeType == node.ELEMENT_NODE :
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204 traverse_tree(n, func)
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205
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206 #########################################################################################################
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207 def return_XML(state, inode, base = True, xmlns = True) :
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208 """
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209 Get (recursively) the XML Literal content of a DOM Element Node. (Most of the processing is done
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210 via a C{node.toxml} call of the xml minidom implementation.)
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211
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212 @param inode: DOM Node
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213 @param state: L{pyRdfa.state.ExecutionContext}
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214 @param base: whether the base element should be added to the output
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215 @type base: Boolean
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216 @param xmlns: whether the namespace declarations should be repeated in the generated node
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217 @type xmlns: Boolean
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218 @return: string
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219 """
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220 node = inode.cloneNode(True)
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221 # Decorate the element with namespaces.lang values and, optionally, base
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222 if base :
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223 node.setAttribute("xml:base",state.base)
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224 if xmlns :
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225 for prefix in state.term_or_curie.xmlns :
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226 if not node.hasAttribute("xmlns:%s" % prefix) :
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227 node.setAttribute("xmlns:%s" % prefix,"%s" % state.term_or_curie.xmlns[prefix])
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228 # Set the default namespace, if not done (and is available)
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229 if not node.getAttribute("xmlns") and state.defaultNS != None :
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230 node.setAttribute("xmlns", state.defaultNS)
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231 # Get the lang, if necessary
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232 if state.lang :
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233 if state.options.host_language in [ HostLanguage.xhtml, HostLanguage.xhtml5, HostLanguage.html5 ] :
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234 if not node.getAttribute("lang") :
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235 node.setAttribute("lang", state.lang)
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236 else :
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237 if not node.getAttribute("xml:lang") :
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238 node.setAttribute("xml:lang", state.lang)
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239
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240 if sys.version_info[0] >= 3 :
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241 return node.toxml()
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242 else :
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243 q = node.toxml(encoding='utf-8')
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244 return str(q, encoding='utf-8')
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245
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246 #########################################################################################################
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247
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248 def dump(node) :
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249 """
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250 This is just for debug purposes: it prints the essential content of the node in the tree starting at node.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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251
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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252 @param node: DOM node
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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253 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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254 print(( node.toprettyxml(indent="", newl="") ))
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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255
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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256
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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257