| |
|
|
| """ |
| Functions to do XML schema and DTD validation. At the moment, this |
| makes a subprocess call to xmllint. This could use a Python-based |
| library at some point in the future, if something appropriate could be |
| found. |
| """ |
|
|
|
|
| import os |
| import subprocess |
|
|
|
|
| def validate_schema(filename, schema_file): |
| """ |
| Validates an XML file against a schema or DTD. |
| |
| Parameters |
| ---------- |
| filename : str |
| The path to the XML file to validate |
| |
| schema_file : str |
| The path to the XML schema or DTD |
| |
| Returns |
| ------- |
| returncode, stdout, stderr : int, str, str |
| Returns the returncode from xmllint and the stdout and stderr |
| as strings |
| """ |
|
|
| base, ext = os.path.splitext(schema_file) |
| if ext == '.xsd': |
| schema_part = '--schema ' + schema_file |
| elif ext == '.dtd': |
| schema_part = '--dtdvalid ' + schema_file |
| else: |
| raise TypeError("schema_file must be a path to an XML Schema or DTD") |
|
|
| p = subprocess.Popen( |
| "xmllint --noout --nonet {} {}".format(schema_part, filename), |
| shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE) |
| stdout, stderr = p.communicate() |
|
|
| if p.returncode == 127: |
| raise OSError( |
| "xmllint not found, so can not validate schema") |
| elif p.returncode < 0: |
| from astropy.utils.misc import signal_number_to_name |
| raise OSError( |
| "xmllint was terminated by signal '{0}'".format( |
| signal_number_to_name(-p.returncode))) |
|
|
| return p.returncode, stdout, stderr |
|
|
