URIutil – Module with functions for strings in context of resource identifiers. This is not targeting for the subset, which is a locator formed as URL (see URLutil). In fact unique key codes for any kind of documents are covered: DOI, ISBN, ISSN, URN; furthermore some national and other codes like LCCN, GTIN/EAN, DNB, GND, ZDB, assigned by public institutions.

All functions expect exactly one unnamed parameter (which should be provided to get a meaningful answer). Whitespace ahead and after content is ignored.

The return value is an empty string (“nothing”), if the parameter value does not fulfil the expectations. If there is a result or the query condition is true, at least one visible character will be returned. The result does not begin or end with a space.

coreISSN

7 significant digits of a 8-digit or 13-digit ISSN

formatISBN

Segmentation by hyphens; “X” capitalized.

formatISSN

Segmentation by hyphens; “X” capitalized.

• Optionally: second parameter 8 or 13 for output format; else as got.

isDNBvalid

Is this DNB (also GND, ZDB) identifier formally correct, including check digit?

• GND have at least 9 digits, not former 8 digits SWD and GKD with check digit separated by hyphen.

If a number with up to 7 digits a check digit separated by hyphen is following, a validation by rules before 2012 is tried.

• nothing – if invalid
• number of digits or 2011 – valid

isDOI

Is this a syntactically correct Digital Object Identifier?

• number of organisation – yes
• nothing – if invalid

isEscValid

Are bad percent escapings in attempt?

• nothing – no complaints
• string – objected sequence

isGTINvalid

Is this GTIN (EAN) formally correct, including check digit?

• number of digits
• nothing – if invalid

GTIN are also ISBN-13, ISSN-13 and perhaps one day AV media.

isISBN

Is this a syntactically correct ISBN?

• 10 if 10 digits and hyphens; also terminated by xX
• 13 if 13 digits and hyphens; starting with bookland
• nothing – else

isISBNvalid

Is this a syntactically correct ISBN, including check digit?

• 10 or 13 – yes
• nothing – no

isISSNvalid

Is this ISSN formally correct, including check digit?

• 8 or 13 – yes
• nichts – no

isLCCN

Is this a syntactically correct LCCN?

• string – identified, without separators
• nothing – if invalid

linkDOI

Bracketed external link on DOI resolver

linkISBN

Bracketed external link on Special:Booksources with prefixed keyword ISBN and formatISBN (also when syntactically incorrect)

• Optionally: second parameter 1 permits invalid check digit.
• Optionally: link=0 and nbsp=0

linkISSN

Bracketed external link on data base of periodicals with prefixed keyword ISSN and formatISSN (also when syntactically incorrect)

• Optionally: second parameter 1 permits invalid check digit.
• Optionally: link=0 and nbsp=0

class="plainlinks-print" won’t be issued.

linkURN

Bracketed external link on URN resolver

For the time being not implemented due lack of universal resolver.

mayDOI

isDOI or empty

• Number of organisation – yes
• 0 – empty
• nothing – if invalid

mayISBN

isISBN or empty

• 10 oder 13 – yes
• 0 empty
• nothing – if invalid

mayISSN

isISSNvalid or empty

• 8 oder 13 – yes
• 0 – empty
• nothing – if invalid

mayLCCN

isLCCN or empty

• string – identified, without separators
• 0 – empty
• nothing – if invalid

mayURI

URI in general or empty; no spaces within, isEscValid

• Optionally: second parameter 1 permits ASCII only (no IRI).
• nothing – no complaints
• string – objected sequence

mayURN

Valid URN or empty

• nothing – no complaints
• string – objected sequence

plainISBN

Raw ISBN with digits only (or X); 10 or 13 characters.

Appropriate for Wikipedia:BibRecord.

targetISSN

Bracketed external link on data base of periodicals formatISSN (also when syntactically incorrect)

• Optionally: second parameter 1 permits invalid check digit.

class="plainlinks-print" won’t be issued.

uriDOI

Like linkDOI with prefixed scheme doi:

• Optionally: link=0 – without linking doi: on Digital Object Identifier like doi:

uriURN

Like linkURN with prefixed scheme urn:

Not yet implemented.

failsafe

The functions link* and uri* link the prefixed keyword/scheme to the assumed enzyclopedic article. The parameter value may specify an alternative page name; or link=0 would suppress linking.

The functions link* will use non breaking space between prefixed keyword and code; but nbsp=0 requests ASCII spaces.

The functions link* and uri* assign class="invalid-ISBN" etc. to invalid codes. This might be utilized by users or gadgets for markup, e.g. a red box around the code.

.invalid-ISBN,
.invalid-ISSN {
   border: solid 2px #FF0000;
}

A test page illustrates practical use.

All functions described above can be used by other modules:^[1]

local lucky, URIutil = pcall( require, "Modul:URIutil" )
if type( URIutil ) == "table" then
    URIutil = URIutil()
else
    -- failure; URLutil is the error message
    return "<span class=\"error\">" .. URIutil .. "</span>"
end

Subsequently there are available:

• URIutil.coreISSN( attempt )
• URIutil.formatISBN( attempt )
• URIutil.formatISSN( attempt, achieve )
• URIutil.isDNBvalid( attempt )
• URIutil.isDOI( attempt )
• URIutil.isEscValid( attempt )
• URIutil.isGTINvalid( attempt )
• URIutil.isISBN( attempt )
  • Second return value: table with ISBN components; number with error code
• URIutil.isISBNvalid( attempt )
  • Second return value: table with ISBN components; number with error code
• URIutil.isISSNvalid( attempt )
• URIutil.isLCCN( attempt )
• URIutil.linkDOI( attempt )
• URIutil.linkISBN( attempt, allow, abbr, adhere )
• URIutil.linkISSN( attempt, allow, abbr, adhere )
• URIutil.mayDOI( attempt )
• URIutil.mayISBN( attempt )
• URIutil.mayISSN( attempt )
• URIutil.mayLCCN( attempt )
• URIutil.mayURI( attempt, ascii )
• URIutil.mayURN( attempt )
• URIutil.plainISBN( attempt )
• URIutil.targetISSN( attempt, allow, any1, any2, alert )
• URIutil.uriDOI( attempt )
• URIutil.uriHandle( attempt )
• URIutil.uriURN( attempt, alternate )
• URIutil.failsafe( atleast )

  1. atleast
     optional
     nil or required version or "wikidata" or ~ keyword

  returns: string or false

The input parameters are:

• attempt – string with code

Optional:

• achieve – number 8 or 13 for output format; else as got.
• allow – true permit invalid check digit.
• abbr – true or string will link prefixed abbreviation ISBN/ISSN.
• adhere – true use   instead of ASCII space.
• ascii – true permit ASCII only (no IRI).

If succeeding, most functions return a string, the URIutil.is*() a number or string; on failure always false.

General library; no limitations.

• Modul:URIutil/config – project dependant adaptions
• Modul:URIutil/isbn – definition of ISBN groups
• Modul:URIutil/urn – definition of URN resolvers

Follow the steps:

1. Copy main module Module:URIutil into your project.
   • If possible keep the name URIutil.
   • If another name is required due to conflict or naming convention or non-latin script then choose a different one.
2. Register this module at d:Q19644443.
3. Copy the following sub modules, and keep the chosen root name:
   • /isbn
   • /urn
4. Create optionally a /config and populate according to your needs.
5. Ready.
6. Consider translation of doc page.

Create a /config sub module of your root module for mw.loadData() access and return a table with the following components (strings):

issn

URL pattern for ISSN link

If containing $1 current ISSN will replace that placeholder, otherwise appended.

pmid

URL pattern for PMID link

If containing $1 current PMID will replace that placeholder, otherwise appended.

supportISBN

Page target for article on International Standard Book Number

No link if set to "-".

supportISSN

Page target for article on International Standard Serial Number

No link if set to "-".

supportPMID

Page target for article on PubMed

No link if set to "-".

supportURN

Page target for article on Uniform Resource Name

No link if set to "-".

1. ↑ Rather than
   URIutil = URIutil()
   previously it has been used:
   URIutil = URIutil.URIutil()
   This should be simplified now.