diff --git a/.github/workflows/unittests.yml b/.github/workflows/unittests.yml index f9d0ba4..7287cc9 100644 --- a/.github/workflows/unittests.yml +++ b/.github/workflows/unittests.yml @@ -64,14 +64,14 @@ jobs: # Install dependencies. `--no-root` means "install all dependencies but not the project # itself", which is what you want to avoid caching _your_ code. The `if` statement # ensures this only runs on a cache miss. - - run: poetry install --no-root + - run: poetry install --no-root --extras "all" if: steps.cache-deps.outputs.cache-hit != 'true' # Now install _your_ project. This isn't necessary for many types of projects -- particularly # things like Django apps don't need this. But it's a good idea since it fully-exercises the # pyproject.toml and makes that if you add things like console-scripts at some point that # they'll be installed and working. - - run: poetry install + - run: poetry install --extras "all" # Runs a single command using the runners shell - name: Run Unittests diff --git a/README.md b/README.md index 0e0ee7a..951a2a4 100644 --- a/README.md +++ b/README.md @@ -26,7 +26,7 @@ Now you might be wondering why another library when there are already a few impl * The implementation achieves 100% test coverage. * It follows Pythonic principles, resulting in clean and readable code. * It adds some cool innovative features such as conditions or error handling and an even more declarative look. -* It provides loaders for various data sources such as CSV +* It provides loaders for various data sources such as CSV, JSON and XML files. Let's take a look at a small example: @@ -213,14 +213,15 @@ Stream.concat(Stream.of([1, 2]), Stream.of([3, 4])) Creates a new Stream from multiple Streams. Order doesn't change. -## Use loaders: Load data from CSV and JSON files in just one line +## Use loaders: Load data from CSV, JSON and XML files in just one line -PyStreamAPI offers a convenient way to load data from CSV and JSON files. Like that you can start processing your files right away without having to worry about reading and parsing the files. +PyStreamAPI offers a convenient way to load data from CSV, JSON and XML files. Like that you can start processing your +files right away without having to worry about reading and parsing the files. You can import the loaders with: ```python -from pystreamapi.loaders import csv, json +from pystreamapi.loaders import csv, json, xml ``` Now you can use the loaders directly when creating your Stream: @@ -241,6 +242,25 @@ Stream.of(json("data.json")) \ You can access the attributes of the data structures directly like you would do with a normal object. +For XML: + +In order to use the XML loader, you need to install the optional xml dependency: + +```bash +pip install streams.py[xml_loader] +``` + +Afterward, you can use the XML loader like this: + +```python +Stream.of(xml("data.xml")) + .map(lambda x: x.attr1) + .for_each(print) +``` + +The access to the attributes is using a node path syntax. For more details on how to use the node path syntax, please +refer to the [documentation](https://pystreamapi.pickwicksoft.org/reference/data-loaders). + ## API Reference For a more detailed documentation view the docs on GitBook: [PyStreamAPI Docs](https://pystreamapi.pickwicksoft.org/) diff --git a/poetry.lock b/poetry.lock index 0b76d3a..6f59f04 100644 --- a/poetry.lock +++ b/poetry.lock @@ -104,6 +104,18 @@ files = [ [package.extras] toml = ["tomli"] +[[package]] +name = "defusedxml" +version = "0.7.1" +description = "XML bomb protection for Python stdlib modules" +category = "main" +optional = true +python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*" +files = [ + {file = "defusedxml-0.7.1-py2.py3-none-any.whl", hash = "sha256:a352e7e428770286cc899e2542b6cdaedb2b4953ff269a210103ec58f6198a61"}, + {file = "defusedxml-0.7.1.tar.gz", hash = "sha256:1bb3032db185915b62d7c6209c5a8792be6a32ab2fedacc84e01b52c51aa3e69"}, +] + [[package]] name = "dill" version = "0.3.7" @@ 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+content-hash = "6252674f8a6cc31e6860115894c00fd86d891059074bf6fdb77bbea533d9cf30" diff --git a/pyproject.toml b/pyproject.toml index 049bd58..41025e1 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -1,6 +1,6 @@ [tool.poetry] name = "streams.py" -version = "1.1.0" +version = "1.2.0" authors = ["Stefan Garlonta "] description = "A stream library for Python inspired by Java Stream API" keywords = ["streams", "parallel", "data"] @@ -15,6 +15,11 @@ packages = [ [tool.poetry.dependencies] python = ">=3.7,<4.0" joblib = ">=1.2,<1.4" +defusedxml = { version = ">=0.7,<0.8", optional = true } + +[tool.poetry.extras] +xml_loader = ["defusedxml"] +all = ["defusedxml"] [tool.poetry.group.test.dependencies] parameterized = "*" diff --git a/pystreamapi/__init__.py b/pystreamapi/__init__.py index 171e82b..77d73a1 100644 --- a/pystreamapi/__init__.py +++ b/pystreamapi/__init__.py @@ -1,5 +1,5 @@ from pystreamapi.__stream import Stream from pystreamapi._streams.error.__levels import ErrorLevel -__version__ = "1.1.0" +__version__ = "1.2.0" __all__ = ["Stream", "ErrorLevel"] diff --git a/pystreamapi/loaders/__init__.py b/pystreamapi/loaders/__init__.py index 5d25db5..877f1a8 100644 --- a/pystreamapi/loaders/__init__.py +++ b/pystreamapi/loaders/__init__.py @@ -1,7 +1,9 @@ from pystreamapi.loaders.__csv.__csv_loader import csv from pystreamapi.loaders.__json.__json_loader import json +from pystreamapi.loaders.__xml.__xml_loader import xml __all__ = [ 'csv', - 'json' + 'json', + 'xml' ] diff --git a/pystreamapi/loaders/__xml/__init__.py b/pystreamapi/loaders/__xml/__init__.py new file mode 100644 index 0000000..e69de29 diff --git a/pystreamapi/loaders/__xml/__xml_loader.py b/pystreamapi/loaders/__xml/__xml_loader.py new file mode 100644 index 0000000..98b551e --- /dev/null +++ b/pystreamapi/loaders/__xml/__xml_loader.py @@ -0,0 +1,117 @@ +try: + from defusedxml import ElementTree +except ImportError as exc: + raise ImportError( + "Please install the xml_loader extra dependency to use the xml loader." + ) from exc +from collections import namedtuple +from pystreamapi.loaders.__lazy_file_iterable import LazyFileIterable +from pystreamapi.loaders.__loader_utils import LoaderUtils + + +class __XmlLoaderUtil: + """Utility class for the XML loader.""" + + def __init__(self): + self.cast_types = True + self.retrieve_children = True + + +config = __XmlLoaderUtil() + + +def xml(src: str, read_from_src=False, retrieve_children=True, cast_types=True, + encoding="utf-8") -> LazyFileIterable: + """ + Loads XML data from either a path or a string and converts it into a list of namedtuples. + Warning: This method isn't safe against malicious XML trees. Parse only safe XML from sources + you trust. + + Returns: + LazyFileIterable: A list of namedtuples, where each namedtuple represents an XML element. + :param retrieve_children: If true, the children of the root element are used as stream + elements. + :param encoding: The encoding of the XML file. + :param src: Either the path to an XML file or an XML string. + :param read_from_src: If True, src is treated as an XML string. If False, src is treated as + a path to an XML file. + :param cast_types: Set as False to disable casting of values to int, bool or float. + """ + config.cast_types = cast_types + config.retrieve_children = retrieve_children + if read_from_src: + return LazyFileIterable(lambda: __load_xml_string(src)) + path = LoaderUtils.validate_path(src) + return LazyFileIterable(lambda: __load_xml_file(path, encoding)) + + +def __load_xml_file(file_path, encoding): + """Load an XML file and convert it into a list of namedtuples.""" + # skipcq: PTC-W6004 + with open(file_path, mode='r', encoding=encoding) as xmlfile: + src = xmlfile.read() + if src: + return __parse_xml_string(src) + return [] + + +def __load_xml_string(xml_string): + """Load XML data from a string and convert it into a list of namedtuples.""" + return __parse_xml_string(xml_string) + + +def __parse_xml_string(xml_string): + """Parse XML string and convert it into a list of namedtuples.""" + root = ElementTree.fromstring(xml_string) + parsed_xml = __parse_xml(root) + return __flatten(parsed_xml) if config.retrieve_children else [parsed_xml] + + +def __parse_xml(element): + """Parse XML element and convert it into a namedtuple.""" + if len(element) == 0: + return __parse_empty_element(element) + if len(element) == 1: + return __parse_single_element(element) + return __parse_multiple_elements(element) + + +def __parse_empty_element(element): + """Parse XML element without children and convert it into a namedtuple.""" + return LoaderUtils.try_cast(element.text) if config.cast_types else element.text + + +def __parse_single_element(element): + """Parse XML element with a single child and convert it into a namedtuple.""" + sub_element = element[0] + sub_item = __parse_xml(sub_element) + Item = namedtuple(element.tag, [sub_element.tag]) + return Item(sub_item) + + +def __parse_multiple_elements(element): + """Parse XML element with multiple children and convert it into a namedtuple.""" + tag_dict = {} + for e in element: + if e.tag not in tag_dict: + tag_dict[e.tag] = [] + tag_dict[e.tag].append(__parse_xml(e)) + filtered_dict = __filter_single_items(tag_dict) + Item = namedtuple(element.tag, filtered_dict.keys()) + return Item(*filtered_dict.values()) + + +def __filter_single_items(tag_dict): + """Filter out single-item lists from a dictionary.""" + return {key: value[0] if len(value) == 1 else value for key, value in tag_dict.items()} + + +def __flatten(data): + """Flatten a list of lists.""" + res = [] + for item in data: + if isinstance(item, list): + res.extend(item) + else: + res.append(item) + return res diff --git a/setup.cfg b/setup.cfg deleted file mode 100644 index 5cc4514..0000000 --- a/setup.cfg +++ /dev/null @@ -1,30 +0,0 @@ -[metadata] -name = streams.py -version = attr: pystreamapi.__version__ -author = Stefan Garlonta -author_email = stefan@pickwicksoft.org -url = https://github.com/PickwickSoft/pystreamapi -description = A stream library for Python inspired by Java Stream API -long_description = file: README.md -long_description_content_type = text/markdown -keywords = streams, parallel, data -license = GPL-3.0 license -classifiers = - License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+) - Programming Language :: Python - Programming Language :: Python :: 3 - -[options] -packages = pystreamapi -zip_safe = True -include_package_data = True -install_requires = - optional.py>=1.3.2 - joblib~=1.2.0 - -[options.extras_require] -dev = - parameterized~=0.8.1 - -[options.package_data] -* = README.md diff --git a/tests/test_xml_loader.py b/tests/test_xml_loader.py new file mode 100644 index 0000000..d339c4a --- /dev/null +++ b/tests/test_xml_loader.py @@ -0,0 +1,107 @@ +# pylint: disable=not-context-manager +from unittest import TestCase +from unittest.mock import patch, mock_open +from xml.etree.ElementTree import ParseError + +from file_test import OPEN, PATH_EXISTS, PATH_ISFILE +from pystreamapi.loaders import xml + +file_content = """ + + + John Doe + 80000 + + + Alice Smith + + Frank + + + + + Bugatti + Mercedes + + + +""" +file_path = 'path/to/data.xml' + + +class TestXmlLoader(TestCase): + + def test_xml_loader_from_file_children(self): + with (patch(OPEN, mock_open(read_data=file_content)), + patch(PATH_EXISTS, return_value=True), + patch(PATH_ISFILE, return_value=True)): + data = xml(file_path) + self.assertEqual(len(data), 3) + self.assertEqual(data[0].salary, 80000) + self.assertIsInstance(data[0].salary, int) + self.assertEqual(data[1].child.name, "Frank") + self.assertIsInstance(data[1].child.name, str) + self.assertEqual(data[2].cars.car[0], 'Bugatti') + self.assertIsInstance(data[2].cars.car[0], str) + + def test_xml_loader_from_file_no_children_false(self): + with (patch(OPEN, mock_open(read_data=file_content)), + patch(PATH_EXISTS, return_value=True), + patch(PATH_ISFILE, return_value=True)): + data = xml(file_path, retrieve_children=False) + self.assertEqual(len(data), 1) + self.assertEqual(data[0].employee[0].salary, 80000) + self.assertIsInstance(data[0].employee[0].salary, int) + self.assertEqual(data[0].employee[1].child.name, "Frank") + self.assertIsInstance(data[0].employee[1].child.name, str) + self.assertEqual(data[0].founder.cars.car[0], 'Bugatti') + self.assertIsInstance(data[0].founder.cars.car[0], str) + + def test_xml_loader_no_casting(self): + with (patch(OPEN, mock_open(read_data=file_content)), + patch(PATH_EXISTS, return_value=True), + patch(PATH_ISFILE, return_value=True)): + data = xml(file_path, cast_types=False) + self.assertEqual(len(data), 3) + self.assertEqual(data[0].salary, '80000') + self.assertIsInstance(data[0].salary, str) + self.assertEqual(data[1].child.name, "Frank") + self.assertIsInstance(data[1].child.name, str) + self.assertEqual(data[2].cars.car[0], 'Bugatti') + self.assertIsInstance(data[2].cars.car[0], str) + + def test_xml_loader_is_iterable(self): + with (patch(OPEN, mock_open(read_data=file_content)), + patch(PATH_EXISTS, return_value=True), + patch(PATH_ISFILE, return_value=True)): + data = xml(file_path) + self.assertEqual(len(list(iter(data))), 3) + + def test_xml_loader_with_empty_file(self): + with (patch(OPEN, mock_open(read_data="")), + patch(PATH_EXISTS, return_value=True), + patch(PATH_ISFILE, return_value=True)): + data = xml(file_path) + self.assertEqual(len(data), 0) + + def test_xml_loader_with_invalid_path(self): + with self.assertRaises(FileNotFoundError): + xml('path/to/invalid.xml') + + def test_xml_loader_with_no_file(self): + with self.assertRaises(ValueError): + xml('./') + + def test_xml_loader_from_string(self): + data = xml(file_content, read_from_src=True) + self.assertEqual(len(data), 3) + self.assertEqual(data[0].salary, 80000) + self.assertIsInstance(data[0].salary, int) + self.assertEqual(data[1].child.name, "Frank") + self.assertIsInstance(data[1].child.name, str) + self.assertEqual(data[2].cars.car[0], 'Bugatti') + self.assertIsInstance(data[2].cars.car[0], str) + + def test_xml_loader_from_empty_string(self): + with self.assertRaises(ParseError): + len(xml('', read_from_src=True)) diff --git a/tox.ini b/tox.ini index c0a4aca..39d413d 100644 --- a/tox.ini +++ b/tox.ini @@ -8,6 +8,7 @@ deps = optional.py joblib parameterized + defusedxml commands = coverage run -m unittest discover -s tests -t tests --pattern 'test_*.py' coverage xml @@ -15,4 +16,4 @@ commands = [coverage:run] relative_files = True source = pystreamapi/ -branch = True \ No newline at end of file +branch = True