test.py

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#!/usr/bin/env python
PKG = 'srdfdom'

import sys
import rospkg
import unittest
from srdfdom.srdf import SRDF
from xml.dom.minidom import parseString
import xml.dom

# xml match code from test_xacro.py  
# by Stuart Glaser and William Woodall

def first_child_element(elt):
  c = elt.firstChild
  while c:
    if c.nodeType == xml.dom.Node.ELEMENT_NODE:
      return c
    c = c.nextSibling
  return None
  
def next_sibling_element(elt):
  c = elt.nextSibling
  while c:
    if c.nodeType == xml.dom.Node.ELEMENT_NODE:
      return c
    c = c.nextSibling
  return None

def all_attributes_match(a, b):
  if len(a.attributes) != len(b.attributes):
    print("Different number of attributes")
    return False
  a_atts = [(a.attributes.item(i).name, a.attributes.item(i).value) for i in range(len(a.attributes))]
  b_atts = [(b.attributes.item(i).name, b.attributes.item(i).value) for i in range(len(b.attributes))]
  a_atts.sort()
  b_atts.sort()
  for i in range(len(a_atts)):
    if a_atts[i][0] != b_atts[i][0]:
      print("Different attribute names: %s and %s" % (a_atts[i][0], b_atts[i][0]))
      return False
    try:
      if abs(float(a_atts[i][1]) - float(b_atts[i][1])) > 1.0e-9:
        print("Different attribute values: %s and %s" % (a_atts[i][1], b_atts[i][1]))
        return False
    except ValueError: # Attribute values aren't numeric
      if a_atts[i][1] != b_atts[i][1]:
        print("Different attribute values: %s and %s" % (a_atts[i][1], b_atts[i][1]))
        return False
  return True

def elements_match(a, b):
  if not a and not b:
    return True
  if not a or not b:
    return False
  if a.nodeType != b.nodeType:
    print("Different node types: %d and %d" % (a.nodeType, b.nodeType))
    return False
  if a.nodeName != b.nodeName:
    print("Different element names: %s and %s" % (a.nodeName, b.nodeName))
    return False
  if not all_attributes_match(a, b):
    return False
  if not elements_match(first_child_element(a), first_child_element(b)):
    return False
  if not elements_match(next_sibling_element(a), next_sibling_element(b)):
    return False
  return True

def xml_matches(a, b):
  if isinstance(a, str):
    return xml_matches(parseString(a).documentElement, b)
  if isinstance(b, str):
    return xml_matches(a, parseString(b).documentElement)
  if a.nodeType == xml.dom.Node.DOCUMENT_NODE:
    return xml_matches(a.documentElement, b)
  if b.nodeType == xml.dom.Node.DOCUMENT_NODE:
    return xml_matches(a, b.documentElement)
  if not elements_match(a, b):
    print("Match failed:")
    a.writexml(sys.stdout)
    print
    print('=' * 78)
    b.writexml(sys.stdout)
    return False
  return True
  
## A python unit test for srdf
class TestSRDFParser(unittest.TestCase):
    ## test valid srdf

  def test_full_srdf(self):
        srdf_data = '''
        <robot name="myrobot">
        <group name="body">
          <joint name="J1" />
          <joint name="J2" />
          <joint name="J3" />
          <chain base_link="robot_base" tip_link="robot_tip" />
          <group name="arm" />
        </group>
        <group_state name="zero" group="body">
        <joint name="J1" value="0" />
        <joint name="J2" value="0" />
        <joint name="J3" value="0" />
        </group_state>
        <end_effector name="tip_ee" parent_link="tip" group="arm" parent_group="body" />
        <end_effector name="othertip_ee" parent_link="othertip" group="arm" />
        <virtual_joint name="virtual_joint" type="floating" parent_frame="body_frame" child_link="arm" />
        <disable_collisions link1="link1" link2="link3" />
        <disable_collisions reason="Adjacent"  link1="link1" link2="link2" />
        <link_sphere_approximation link="link1" />
        <link_sphere_approximation link="link2" >
            <sphere center="1.0 2.0 3.0" radius="1.0" />
            <sphere center="1.0 2.0 4.0" radius="2.0" />
        </link_sphere_approximation>
        </robot>
        '''
        expected = '''
<robot name="myrobot">
  <group name="body">
    <joint name="J1" />
    <joint name="J2" />
    <joint name="J3" />
    <chain base_link="robot_base" tip_link="robot_tip"/>
    <group name="arm" />
  </group>
  <group_state name="zero" group="body">
    <joint name="J1" value="0" />
    <joint name="J2" value="0" />
    <joint name="J3" value="0" />
  </group_state>
  <end_effector group="arm" name="tip_ee" parent_group="body" parent_link="tip"/>
  <end_effector name="othertip_ee" parent_link="othertip" group="arm" />
  <virtual_joint child_link="arm" name="virtual_joint" parent_frame="body_frame" type="floating"  />
  <disable_collisions link1="link1" link2="link3" />
  <disable_collisions link1="link1" link2="link2" reason="Adjacent" />
  <link_sphere_approximation link="link1" />
  <link_sphere_approximation link="link2" >
    <sphere center="1.0 2.0 3.0" radius="1.0" />
    <sphere center="1.0 2.0 4.0" radius="2.0" />
  </link_sphere_approximation>
</robot>
        '''
        robot = SRDF.from_xml_string(srdf_data)
        self.assertTrue( xml_matches(robot.to_xml_string(),expected))
        
  def test_simple_srdf(self):
        datadir=rospkg.RosPack().get_path('srdfdom')+"/test/res/"
        stream = open(datadir+'pr2_desc.1.srdf', 'r')
        robot = SRDF.from_xml_string(stream.read())
        stream.close()
        self.assertTrue(len(robot.virtual_joints)==0)
        self.assertTrue(len(robot.groups)==0)
        self.assertTrue(len(robot.group_states)==0)
        self.assertTrue(len(robot.disable_collisionss)==0)
        self.assertTrue(len(robot.end_effectors)==0)
        
        stream = open(datadir+'pr2_desc.2.srdf', 'r')
        robot = SRDF.from_xml_string(stream.read())
        stream.close()
        self.assertTrue(len(robot.virtual_joints)==1)
        self.assertTrue(len(robot.groups)==1)
        self.assertTrue(len(robot.group_states)==0)
        self.assertTrue(len(robot.disable_collisionss)==0)
        self.assertTrue(len(robot.end_effectors)==0)
        
  def test_complex_srdf(self):
        datadir=rospkg.RosPack().get_path('srdfdom')+"/test/res/"
        stream = open(datadir+'pr2_desc.3.srdf', 'r')
        robot = SRDF.from_xml_string(stream.read())
        stream.close()
        self.assertTrue(len(robot.virtual_joints)==1)
        self.assertTrue(len(robot.groups)==7)
        self.assertTrue(len(robot.group_states)==2)
        self.assertTrue(len(robot.disable_collisionss)==2)
        self.assertTrue(robot.disable_collisionss[0].reason=="adjacent")
        self.assertTrue(len(robot.end_effectors)==2)
        
        self.assertTrue(robot.virtual_joints[0].name=="world_joint")
        self.assertTrue(robot.virtual_joints[0].type=="planar")
        
        for group in robot.groups:
          if (group.name == "left_arm" or group.name == "right_arm" ):
            self.assertTrue(len(group.chains)==1)
          if group.name == "arms":
            self.assertTrue(len(group.subgroups)==2)
          if group.name == "base":
            self.assertTrue(len(group.joints)==1)
          if (group.name == "l_end_effector" or group.name == "r_end_effector" ):
            self.assertTrue(len(group.links)==1)
            self.assertTrue(len(group.joints)==9)
          if group.name == "whole_body" :
            self.assertTrue(len(group.joints)==1)
            self.assertTrue(len(group.subgroups)==2)
    
        index=0
        if robot.group_states[0].group !="arms":
          index=1
          
        self.assertTrue(robot.group_states[index].group =="arms")
        self.assertTrue(robot.group_states[index].name =="tuck_arms")
        self.assertTrue(robot.group_states[1-index].group =="base")
        self.assertTrue(robot.group_states[1-index].name =="home")
            
        v=next((joint.value for joint in robot.group_states[index].joints if joint.name=="l_shoulder_pan_joint"),None)  
        self.assertTrue(len(v) == 1)
        self.assertTrue(v[0] ==0.2)
        
        w=next((joint.value for joint in robot.group_states[1-index].joints if joint.name=="world_joint"),None)  
        self.assertTrue(len(w) == 3)
        self.assertTrue(w[0] ==0.4)
        self.assertTrue(w[1] ==0)
        self.assertTrue(w[2] ==-1)
        
        index = 0 if (robot.end_effectors[0].name[0] == 'r') else 1
        self.assertTrue(robot.end_effectors[index].name == 'r_end_effector')
        self.assertTrue(robot.end_effectors[index].group == 'r_end_effector')
        self.assertTrue(robot.end_effectors[index].parent_link == 'r_wrist_roll_link')
      

if __name__ == '__main__':
    import rostest
    rostest.rosrun(PKG, 'srdf_python_parser_test', TestSRDFParser)