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SlicerScriptedFileReaderWriterTest.py
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SlicerScriptedFileReaderWriterTest.py
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import logging
import os
import slicer
from slicer.ScriptedLoadableModule import *
class SlicerScriptedFileReaderWriterTest(ScriptedLoadableModule):
def __init__(self, parent):
ScriptedLoadableModule.__init__(self, parent)
parent.title = "SlicerScriptedFileReaderWriterTest"
parent.categories = ["Testing.TestCases"]
parent.dependencies = []
parent.contributors = ["Andras Lasso (PerkLab, Queen's)"]
parent.helpText = """
This module is used to test qSlicerScriptedFileReader and qSlicerScriptedFileWriter classes.
"""
parent.acknowledgementText = """
This file was originally developed by Andras Lasso, PerkLab.
"""
self.parent = parent
class SlicerScriptedFileReaderWriterTestWidget(ScriptedLoadableModuleWidget):
def setup(self):
ScriptedLoadableModuleWidget.setup(self)
# Default reload&test widgets are enough.
# Note that reader and writer is not reloaded.
class SlicerScriptedFileReaderWriterTestFileReader:
def __init__(self, parent):
self.parent = parent
def description(self):
return "My file type"
def fileType(self):
return "MyFileType"
def extensions(self):
return ["My file type (*.mft)"]
def canLoadFile(self, filePath):
# Only enable this reader in testing mode
if not slicer.app.testingEnabled():
return False
# Check first if loadable based on file extension
if not self.parent.supportedNameFilters(filePath):
return False
firstLine = ""
with open(filePath) as f:
firstLine = f.readline()
validFile = "magic" in firstLine
return validFile
def load(self, properties):
try:
filePath = properties["fileName"]
# Get node base name from filename
if "name" in properties.keys():
baseName = properties["name"]
else:
baseName = os.path.splitext(os.path.basename(filePath))[0]
baseName = slicer.mrmlScene.GenerateUniqueName(baseName)
# Read file content
with open(filePath) as myfile:
data = myfile.readlines()
# Check if file is valid
firstLine = data[0].rstrip()
if firstLine != "magic":
raise ValueError("Cannot read file, it is expected to start with magic")
# Load content into new node
loadedNode = slicer.mrmlScene.AddNewNodeByClass("vtkMRMLTextNode", baseName)
loadedNode.SetText("".join(data[1:]))
# Uncomment the next line to display a warning message to the user.
# self.parent.userMessages().AddMessage(vtk.vtkCommand.WarningEvent, "This is a warning message")
except Exception as e:
import traceback
traceback.print_exc()
errorMessage = f"Failed to read file: {str(e)}"
self.parent.userMessages().AddMessage(vtk.vtkCommand.ErrorEvent, errorMessage)
return False
self.parent.loadedNodes = [loadedNode.GetID()]
return True
class SlicerScriptedFileReaderWriterTestFileWriter:
def __init__(self, parent):
self.parent = parent
def description(self):
return "My file type"
def fileType(self):
return "MyFileType"
def extensions(self, obj):
return ["My file type (*.mft)"]
def canWriteObject(self, obj):
# Only enable this writer in testing mode
if not slicer.app.testingEnabled():
return False
return bool(obj.IsA("vtkMRMLTextNode"))
def write(self, properties):
try:
# Get node
node = slicer.mrmlScene.GetNodeByID(properties["nodeID"])
# Write node content to file
filePath = properties["fileName"]
with open(filePath, "w") as myfile:
myfile.write("magic\n")
myfile.write(node.GetText())
except Exception as e:
import traceback
traceback.print_exc()
errorMessage = f"Failed to write file: {str(e)}"
self.parent.userMessages().AddMessage(vtk.vtkCommand.ErrorEvent, errorMessage)
return False
self.parent.writtenNodes = [node.GetID()]
return True
class SlicerScriptedFileReaderWriterTestTest(ScriptedLoadableModuleTest):
def runTest(self):
"""Run as few or as many tests as needed here."""
self.setUp()
self.test_Writer()
self.test_Reader()
self.tearDown()
self.delayDisplay("Testing complete")
def setUp(self):
self.tempDir = slicer.util.tempDirectory()
logging.info("tempDir: " + self.tempDir)
self.textInNode = "This is\nsome example test"
self.validFilename = self.tempDir + "/tempSlicerScriptedFileReaderWriterTestValid.mft"
self.invalidFilename = self.tempDir + "/tempSlicerScriptedFileReaderWriterTestInvalid.mft"
slicer.mrmlScene.Clear()
def tearDown(self):
import shutil
shutil.rmtree(self.tempDir, True)
def test_WriterReader(self):
# Writer and reader tests are put in the same function to ensure
# that writing is done before reading (it generates input data for reading).
self.delayDisplay("Testing node writer")
slicer.mrmlScene.Clear()
textNode = slicer.mrmlScene.AddNewNodeByClass("vtkMRMLTextNode")
textNode.SetText(self.textInNode)
self.assertTrue(slicer.util.saveNode(textNode, self.validFilename, {"fileType": "MyFileType"}))
self.delayDisplay("Testing node reader")
slicer.mrmlScene.Clear()
loadedNode = slicer.util.loadNodeFromFile(self.validFilename, "MyFileType")
self.assertIsNotNone(loadedNode)
self.assertTrue(loadedNode.IsA("vtkMRMLTextNode"))
self.assertEqual(loadedNode.GetText(), self.textInNode)