3 from StringIO import StringIO
4 from datetime import datetime, timedelta
5 from sfa.util.xrn import *
6 from sfa.util.plxrn import hostname_to_urn
7 from sfa.util.faults import SfaNotImplemented, InvalidRSpec, InvalidRSpecElement
15 for (key, value) in filter.items():
20 if isinstance(value, str):
21 filter_list.append('%s="%s"' % (key, value))
22 elif isinstance(value, list):
23 filter_list.append('contains("%s", %s)' % (' '.join(map(str, value)), key))
25 xpath = ' and '.join(filter_list)
26 xpath = '[' + xpath + ']'
31 def __init__(self, xml=""):
32 self.header = '<?xml version="1.0"?>\n'
33 self.template = """<RSpec></RSpec>"""
35 self.namespaces = None
45 self.parse_rspec(self.template)
47 def parse_xml(self, xml):
49 parse rspec into etree
51 parser = etree.XMLParser(remove_blank_text=True)
53 tree = etree.parse(xml, parser)
55 # 'rspec' file doesnt exist. 'rspec' is proably an xml string
57 tree = etree.parse(StringIO(xml), parser)
59 raise InvalidRSpec(str(e))
60 self.xml = tree.getroot()
62 def validate(self, schema):
64 Validate against rng schema
67 relaxng_doc = etree.parse(schema)
68 relaxng = etree.RelaxNG(relaxng_doc)
69 if not relaxng(self.xml):
70 error = relaxng.error_log.last_error
71 message = "%s (line %s)" % (error.message, error.line)
72 raise InvalidRSpec(message)
75 def xpath(self, xpath):
76 return self.xml.xpath(xpath, namespaces=self.namespaces)
78 def add_attribute(self, elem, name, value):
80 Add attribute to specified etree element
82 opt = etree.SubElement(elem, name)
85 def add_element(self, name, attrs={}, parent=None, text=""):
87 Generic wrapper around etree.SubElement(). Adds an element to
88 specified parent node. Adds element to root node is parent is
93 element = etree.SubElement(parent, name)
96 if isinstance(attrs, dict):
98 element.set(attr, attrs[attr])
101 def remove_attribute(self, elem, name, value):
103 Removes an attribute from an element
106 opts = elem.iterfind(name)
109 if opt.text == value:
112 def remove_element(self, element_name, root_node = None):
114 Removes all occurences of an element from the tree. Start at
115 specified root_node if specified, otherwise start at tree's root.
120 if not element_name.startswith('//'):
121 element_name = '//' + element_name
123 elements = root_node.xpath('%s ' % element_name, namespaces=self.namespaces)
124 for element in elements:
125 parent = element.getparent()
126 parent.remove(element)
128 def attributes_list(self, elem):
129 # convert a list of attribute tags into list of tuples
130 # (tagnme, text_value)
134 opts.append((e.tag, str(e.text).strip()))
137 def get_element_attributes(self, elem=None, depth=0):
139 elem = self.root_node
140 if not hasattr(elem, 'attrib'):
141 # this is probably not an element node with attribute. could be just and an
142 # attribute, return it
144 attrs = dict(elem.attrib)
145 attrs['text'] = str(elem.text).strip()
146 attrs['parent'] = elem.getparent()
147 if isinstance(depth, int) and depth > 0:
148 for child_elem in list(elem):
149 key = str(child_elem.tag)
151 attrs[key] = [self.get_element_attributes(child_elem, depth-1)]
153 attrs[key].append(self.get_element_attributes(child_elem, depth-1))
155 attrs['child_nodes'] = list(elem)
158 def merge(self, in_xml):
163 Optional method which inheriting classes can choose to implent.
170 def toxml(self, cleanup=False):
173 return self.header + etree.tostring(self.xml, pretty_print=True)
175 def save(self, filename):
176 f = open(filename, 'w')
177 f.write(self.toxml())
180 if __name__ == '__main__':
181 rspec = RSpec('/tmp/resources.rspec')