diff --git a/.github/workflows/ci_template.yml b/.github/workflows/ci_template.yml index b34b1dc..c4baed7 100644 --- a/.github/workflows/ci_template.yml +++ b/.github/workflows/ci_template.yml @@ -9,7 +9,7 @@ on: type: string python-version: description: 'Python version' - default: '["3.12"]' + default: '["3.9", "3.12"]' type: string jobs: diff --git a/.vscode/settings.json b/.vscode/settings.json new file mode 100644 index 0000000..e137fad --- /dev/null +++ b/.vscode/settings.json @@ -0,0 +1,4 @@ +{ + "python.testing.unittestEnabled": false, + "python.testing.pytestEnabled": true +} \ No newline at end of file diff --git a/csvy/validators.py b/csvy/validators.py new file mode 100644 index 0000000..103f18c --- /dev/null +++ b/csvy/validators.py @@ -0,0 +1,129 @@ +"""This module contains validators for the CSVY file format.""" + +import csv +from typing import Optional, TypeVar + +from pydantic import BaseModel, Field + +# Create a generic variable that can be 'Parent', or any subclass. +T = TypeVar("T", bound="CSVDialectValidator") + + +class CSVDialectValidator(BaseModel): + r"""Implements a validator for CSV Dialects. + + This class is used to validate the CSV Dialects in the CSVY file. It is based on the + `csv.Dialect` class from the Python Standard Library. It does not include the + 'quoting' attribute, as it is not serializable as JSON or easy to understand by + other tools, but rather a python specific thing. + + Attributes: + delimiter: A one-character string used to separate fields. + doublequote: Controls how instances of quotechar appearing inside a field should + themselves be quoted. When True, the character is doubled. When False, the + escapechar is used as a prefix to the quotechar. It defaults to True. + escapechar: A one-character string used by the writer to escape the delimiter. + It defaults to None. + lineterminator: The string used to terminate lines produced by the writer. It + defaults to '\\r\\n'. + quotechar: A one-character string used to quote fields containing special + characters, such as the delimiter or quotechar, or which contain new-line + characters. It defaults to '"'. + skipinitialspace: When True, whitespace immediately following the delimiter is + ignored. It defaults to False. + """ + + delimiter: str = Field(default=",") + doublequote: bool = Field(default=True) + escapechar: Optional[str] = Field(default=None) + lineterminator: str = Field(default="\r\n") + quotechar: str = Field(default='"') + skipinitialspace: bool = Field(default=False) + + def to_dialect(self) -> csv.Dialect: + """Converts the validator to a custom csv.Dialect object. + + This method converts the validator to a custom csv.Dialect object that can be + used to read or write CSV files with the specified dialect. + + For 'quoting', the default value is used, as it is not serializable. + + Returns: + A custom csv.Dialect object with the specified attributes. + """ + dialect = type( + "CustomDialect", + (csv.Dialect,), + { + "delimiter": self.delimiter, + "doublequote": self.doublequote, + "escapechar": self.escapechar, + "lineterminator": self.lineterminator, + "quotechar": self.quotechar, + "skipinitialspace": self.skipinitialspace, + "quoting": csv.QUOTE_MINIMAL, # This is not serializable. + }, + ) + return dialect() + + @classmethod + def excel(cls: type[T]) -> T: + """Returns a validator for the Excel CSV Dialect. + + This method returns a validator for the Excel CSV Dialect, which is a common + dialect used in Excel files. + + Returns: + A validator for the Excel CSV Dialect. + """ + excel = csv.excel() + return cls( + delimiter=excel.delimiter, + doublequote=excel.doublequote, + escapechar=excel.escapechar, + lineterminator=excel.lineterminator, + quotechar=excel.quotechar, + skipinitialspace=excel.skipinitialspace, + ) + + @classmethod + def excel_tab(cls: type[T]) -> T: + """Returns a validator for the Excel Tab CSV Dialect. + + This method returns a validator for the Excel Tab CSV Dialect, which is a common + dialect used in Excel files with tab delimiters. + + `excel` has not parameter `strict` so that one is ignored. + + Returns: + A validator for the Excel Tab CSV Dialect. + """ + excel_tab = csv.excel_tab() + return cls( + delimiter=excel_tab.delimiter, + doublequote=excel_tab.doublequote, + escapechar=excel_tab.escapechar, + lineterminator=excel_tab.lineterminator, + quotechar=excel_tab.quotechar, + skipinitialspace=excel_tab.skipinitialspace, + ) + + @classmethod + def unix_dialect(cls: type[T]) -> T: + """Returns a validator for the Unix CSV Dialect. + + This method returns a validator for the Unix CSV Dialect, which is a common + dialect used in Unix files. + + Returns: + A validator for the Unix CSV Dialect. + """ + unix = csv.unix_dialect() + return cls( + delimiter=unix.delimiter, + doublequote=unix.doublequote, + escapechar=unix.escapechar, + lineterminator=unix.lineterminator, + quotechar=unix.quotechar, + skipinitialspace=unix.skipinitialspace, + ) diff --git a/poetry.lock b/poetry.lock index 75de584..1107664 100644 --- a/poetry.lock +++ b/poetry.lock @@ -1,5 +1,16 @@ # This file is automatically @generated by Poetry 1.8.3 and should not be changed by hand. +[[package]] +name = "annotated-types" +version = "0.7.0" +description = "Reusable constraint types to use with typing.Annotated" +optional = false +python-versions = ">=3.8" +files = [ + {file = "annotated_types-0.7.0-py3-none-any.whl", hash = "sha256:1f02e8b43a8fbbc3f3e0d4f0f4bfc8131bcb4eebe8849b8e5c773f3a1c582a53"}, + {file = "annotated_types-0.7.0.tar.gz", hash = "sha256:aff07c09a53a08bc8cfccb9c85b05f1aa9a2a6f23728d790723543408344ce89"}, +] + [[package]] name = "attrs" version = "24.2.0" @@ -867,9 +878,9 @@ files = [ [package.dependencies] numpy = [ + {version = ">=1.26.0", markers = "python_version >= \"3.12\""}, {version = ">=1.22.4", markers = "python_version < \"3.11\""}, {version = ">=1.23.2", markers = "python_version == \"3.11\""}, - {version = ">=1.26.0", markers = "python_version >= \"3.12\""}, ] python-dateutil = ">=2.8.2" pytz = ">=2020.1" @@ -1001,6 +1012,130 @@ nodeenv = ">=0.11.1" pyyaml = ">=5.1" virtualenv = ">=20.10.0" +[[package]] +name = "pydantic" +version = "2.9.2" +description = 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"6321c85f6246e8baff7fad55345b0eb4585acce9a54e70f845665f5f9dd63ea2" +content-hash = "f4bbca0286e0fcd757a9b8284f7361e2e34be757216ac12c75ead50787b76695" diff --git a/pyproject.toml b/pyproject.toml index f792932..ec209b4 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -24,6 +24,7 @@ packages = [{ include = "csvy" }] [tool.poetry.dependencies] python = "^3.9" PyYAML = "^6.0" +pydantic = "^2.9.2" # A list of all of the optional dependencies, which are included in the # below `extras`. They can be opted into by apps. diff --git a/tests/test_validators.py b/tests/test_validators.py new file mode 100644 index 0000000..a71d58c --- /dev/null +++ b/tests/test_validators.py @@ -0,0 +1,22 @@ +"""Tests for the validators module.""" + +import pytest + + +@pytest.mark.parametrize("shortcut", ["excel", "excel_tab", "unix_dialect"]) +def test_shortcut_dialects_roundtrip(shortcut): + """Test that the shortcut dialects roundtrip to the actual dialects.""" + import csv + + from csvy.validators import CSVDialectValidator + + validator = getattr(CSVDialectValidator, shortcut)() + dialect = validator.to_dialect() + actual = getattr(csv, shortcut)() + + assert dialect.delimiter == actual.delimiter + assert dialect.doublequote == actual.doublequote + assert dialect.escapechar == actual.escapechar + assert dialect.lineterminator == actual.lineterminator + assert dialect.quotechar == actual.quotechar + assert dialect.skipinitialspace == actual.skipinitialspace