parse Reviewers Edition numbers

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Reviewers Editions are a simple way to number editions of useful prose projects, like policy statements or legal terms.
Each Reviewers Edition has up to four numbers.
  1. An edition number

  1. An update number

  1. A correction number

  1. A draft number

Every Reviewers Edition has an edition number. The edition number and any other numbers must be whole numbers, one or greater, written without any leading zeros.
These numbers increase over time for new published versions of a project. Correction numbers restart at one for every new update, and update numbers restart at one for every new edition.
How the authors of a project change numbers over time conveys advice to users of older editions.
  1. When authors recommend users review a new edition in its entirety to
ensure it meets their needs, they increase the _edition_ number.

For example, if a working group rewrites "second edition" of a form
privacy notice from scratch, they will release the rewrite as the
"third edition" of the form.

Users of "first edition" and "second edition" will know they should
review new "third edition" from top to bottom before substituting for
the editions they currently use.
  1. When authors recommend users review at least the new or changed parts
of a new edition, they increase the _update_ number.

For example, if the working group adds a new paragraph to "third
edition" of its form privacy notice on location data, they will
release the expanded policy as "third edition, first update". If they
later rephrase a paragraph on genetic privacy, the will release the
updated policy as "third edition, second update".

Users of "third edition" will know to review at least the parts of
the form that changed.
  1. When authors make only typographic or other, minor corrections that
users need not review, they increase the _correction_ number.

For example, if the working group corrects a spelling error in
"second edition, first update" of their form, they will release the
corrected form as "second edition, first update, first correction".
If they later catch and correct a typographical error, the resulting
edition will be "second edition, first update, second correction".

Users of "second edition, first update" will know the working group
advises they can use the corrected editions without further review.
Authors can also use Reviewers Editions to mark drafts of a new edition, update, or correction to come.
For example, if the working group publishes two drafts of the second update to the third edition, those drafts will be "fourth edition, first draft" and "fourth edition, second draft".
Exported Module
This npm package exports a single function that parses Reviewers Edition short code strings, returning structured representations of their components.
var parse = require('reviewers-edition-parse')
The following examples are also the test suite for the parser. The tests use Node.js' built-in assert module.
var assert = require('assert')

The simplest Reviewers Edition has only an edition number. This number is written followed by the lower-case letter "u". So "second edition" becomes 2e:
assert.deepStrictEqual(parse('2e'), {edition: 2})

An edition number cannot be zero, nor can it start with a zero.
assert.equal(parse('0e'), false)
assert.equal(parse('01e'), false)

The fifth update to a second edition adds the number five followed by the lower-case letter "u". So "second edition, fifth update" becomes 2e5u.
assert.deepStrictEqual(parse('2e5u'), {edition: 2, update: 5})

An edition number cannot be zero, nor can it start with a zero.
assert.equal(parse('2e0u'), false)
assert.equal(parse('2e01u'), false)

The seventh correction to that edition adds the number seven followed by the lower-case letter "c". So "second edition, fifth update, seventh correction" becomes 2e5u7c.
  {edition: 2, update: 5, correction: 7}

An correction number cannot be zero, nor can it start with a zero.
assert.equal(parse('2e5u0c'), false)
assert.equal(parse('2e5u01c'), false)

An edition that has not been updated can also be corrected. So "third edition, second correction" becomes 3e2c.
assert.deepStrictEqual(parse('3e2c'), {edition: 3, correction: 2})

The first draft of a new fourth edition would use the Reviewers Edition code for the fourth edition, followed by the number one and the lower-case letter "d". So "fourth edition, first draft" becomes 4e1d.
assert.deepStrictEqual(parse('4e1d'), {edition: 4, draft: 1})

Reviewers Editions can similarly describe various drafts of new updates and corrections. So "fourth edition, fifth update, first draft" becomes 4e5u1d.
  {edition: 4, update: 5, draft: 1}

Similarly, "fourth edition, fifth update, eighth correction, first draft" becomes 4e5u8c1d.
  {edition: 4, update: 5, correction: 8, draft: 1}

The parser function returns false for any invalid Reviewers Edition.
assert.equal(parse('1.0.0'), false)
Other Modules
An array of names for the numbers of Reviewers Editions are packaged as a JSON file, and can be required separately.
  ['edition', 'update', 'correction', 'draft']

The regular expression used to parse strings can be also be required separately.
var re = require('reviewers-edition-parse/regular-expression')

The match groups of the regular expression correspond to the order of number names.
var match = re.exec('1e2u3c4d')
assert.equal(match[1], '1')
assert.equal(match[2], '2')
assert.equal(match[3], '3')
assert.equal(match[4], '4')
Versions of this Package
This package uses semantic versioning numbers.
1.x releases are deprecated.
2.0.0 correctly parses inputs like 1e3c and clarifies that the parser function returns false for invalid inputs.
This package is bundled with other functions for creating and manipulating Reviewers Editions in reved.