moz.l10n

This is a library of Python tools and utilities for working with localization files, primarily built for internal use at Mozilla.

The core idea here is to establish Message and Resource as format-independent representations of localizable and localized messages and resources, so that operations like linting and transforms can be applied to them.

Parsers and serializers are provided for a number of formats, using common and well-established libraries to take care of the details. A unified API for these is provided, such that FORMAT_parse(text) will always accept str input, and FORMAT_serialize(resource) will always provide a str iterator. All the serializers accept a trim_comments argument which leaves out comments from the serialized result, but additional input types and options vary by format.

The Message and Resource representations are drawn from work done for the Unicode MessageFormat 2 specification and the Message resource specification.

moz.l10n.resources

detect_format

def detect_format(name: str | None, source: bytes | str) -> Format | None

Detect the format of the input based on its file extension and/or contents.

Returns a Format enum value, or None if the input is not recognized.

iter_resources

def iter_resources(
    root: str,
    dirs: list[str] | None = None,
    ignorepath: str = ".l10n-ignore"
) -> Iterator[tuple[str, Resource[Message, str] | None]]

Iterate through localizable resources under the root directory. Use dirs to limit the search to only some subdirectories under root.

Yields (str, Resource | None) tuples, with the file path and the corresponding Resource, or None for files that could not be parsed as localization resources.

To ignore files, include a .l10n-ignore file in root, or some other location passed in as ignorepath. This file uses a git-ignore syntax, and is always based in the root directory.

parse_resource

def parse_resource(
    input: Format | str | None,
    source: str | bytes | None = None
) -> Resource[Message, str]

Parse a Resource from its string representation.

The first argument may be an explicit Format, the file path as a string, or None. For the latter two types, an attempt is made to detect the appropriate format.

If the first argument is a string path, the source argument is optional, as the file will be opened and read.

serialize_resource

def serialize_resource(
    resource: Resource[str, str] | Resource[Message, str],
    format: Format | None = None,
    trim_comments: bool = False
) -> Iterator[str]

Serialize a Resource as its string representation.

If format is set, it overrides the resource.format value.

With trim_comments, all standalone and attached comments are left out of the serialization.