Source code for sas.sascalc.file_converter.cansas_writer

from sas.sascalc.dataloader.readers.cansas_reader import Reader as CansasReader
from sas.sascalc.dataloader.data_info import Data1D

import inspect

[docs]class CansasWriter(CansasReader):
[docs] def write(self, filename, frame_data, sasentry_attrs=None): """ Write the content of a Data1D as a CanSAS XML file :param filename: name of the file to write :param datainfo: Data1D object """ # Create XML document doc, _ = self._to_xml_doc(frame_data, sasentry_attrs) # Write the file file_ref = open(filename, 'w') if self.encoding == None: self.encoding = "UTF-8" doc.write(file_ref, encoding=self.encoding, pretty_print=True, xml_declaration=True) file_ref.close()
def _to_xml_doc(self, frame_data, sasentry_attrs=None): """ Create an XML document to contain the content of an array of Data1Ds :param frame_data: An array of Data1D objects """ valid_class = all([issubclass(data.__class__, Data1D) for data in frame_data]) if not valid_class: raise RuntimeError, ("The cansas writer expects an array of " "Data1D instances") # Get PIs and create root element pi_string = self._get_pi_string() # Define namespaces and create SASroot object main_node = self._create_main_node() # Create ElementTree, append SASroot and apply processing instructions base_string = pi_string + self.to_string(main_node) base_element = self.create_element_from_string(base_string) doc = self.create_tree(base_element) # Create SASentry Element entry_node = self.create_element("SASentry", sasentry_attrs) root = doc.getroot() root.append(entry_node) # Use the first element in the array for writing metadata datainfo = frame_data[0] # Add Title to SASentry self.write_node(entry_node, "Title", datainfo.title) # Add Run to SASentry self._write_run_names(datainfo, entry_node) # Add Data info to SASEntry for data_info in frame_data: self._write_data(data_info, entry_node) # Transmission Spectrum Info self._write_trans_spectrum(datainfo, entry_node) # Sample info self._write_sample_info(datainfo, entry_node) # Instrument info instr = self._write_instrument(datainfo, entry_node) # Source self._write_source(datainfo, instr) # Collimation self._write_collimation(datainfo, instr) # Detectors self._write_detectors(datainfo, instr) # Processes info self._write_process_notes(datainfo, entry_node) # Note info self._write_notes(datainfo, entry_node) # Return the document, and the SASentry node associated with # the data we just wrote return doc, entry_node def _write_data(self, datainfo, entry_node): """ Writes the I and Q data to the XML file :param datainfo: The Data1D object the information is coming from :param entry_node: lxml node ElementTree object to be appended to """ node = self.create_element("SASdata") self.append(node, entry_node) for i in range(len(datainfo.x)): point = self.create_element("Idata") node.append(point) self.write_node(point, "Q", datainfo.x[i], {'unit': datainfo.x_unit}) if len(datainfo.y) >= i: self.write_node(point, "I", datainfo.y[i], {'unit': datainfo.y_unit}) if datainfo.dy != None and len(datainfo.dy) > i: self.write_node(point, "Idev", datainfo.dy[i], {'unit': datainfo.y_unit}) if datainfo.dx != None and len(datainfo.dx) > i: self.write_node(point, "Qdev", datainfo.dx[i], {'unit': datainfo.x_unit}) if datainfo.dxw != None and len(datainfo.dxw) > i: self.write_node(point, "dQw", datainfo.dxw[i], {'unit': datainfo.x_unit}) if datainfo.dxl != None and len(datainfo.dxl) > i: self.write_node(point, "dQl", datainfo.dxl[i], {'unit': datainfo.x_unit})