NOTICE

Vale Harper Style
Copyright (c) 2026 Joseph Kato and contributors

This product includes software and linguistic rule definitions derived from
Harper (https://github.com/Automattic/harper), Copyright (c) Automattic, Inc.
and contributors, licensed under the Apache License, Version 2.0.

Everything derived from Harper carries a header naming it. Four kinds of
material are derived, from three parts of Harper's source:

  - Rules under generated/ compiled from Harper's `.weir` rule definitions.
    The matched phrases, corrections, messages and descriptions in those files
    are Harper's; the translation into Vale's rule format is this project's.

  - Rules under generated/ compiled from Harper's Rust linters. The phrases
    and messages are Harper's, read from the linter's own expression or from
    the examples it is tested against.

  - The tagger dictionary shipped with the style, expanded from Harper's
    dictionary and affix rules by Harper's own tooling. The words, their parts
    of speech and their inflections are Harper's.

  - Rules under Harper/ written by hand from a Harper linter's source, where a
    generator could not express what the linter does. These state the same
    phrases, conditions and messages as the linter they were read from.

Changes made to the original work:

  - Rule definitions were compiled into Vale's `existence`, `substitution` and
    `sequence` check formats.
  - Alternations were expanded into literal phrases, since Vale matches by
    pattern rather than by parsed expression.
  - Part-of-speech constraints were translated from Harper's universal tags
    into the Penn Treebank tags Vale's tagger produces, which do not divide the
    categories the same way.
  - Severity levels were assigned from Harper's rule kinds, which Vale requires
    and Harper does not express.
  - Rules Harper reports under one name but which need more than one Vale check
    are numbered, and some of Harper's rules are not ported at all; the
    generators name a reason for each omission.
  - Linters Harper ships disabled, and linters whose source Harper never adds
    to its lint group, are omitted so that the style reports what Harper
    reports rather than what its source tree contains.

The corpus the port is measured against is built from the examples in Harper's
own tests. It is not distributed with the style.

You may obtain a copy of the Apache License, Version 2.0 at

    http://www.apache.org/licenses/LICENSE-2.0