Struct Doi 

pub struct Doi(/* private fields */);

A Digital Object Identifier, held bare (10.3886/ICPSR36966.v1).

A newtype for one reason: a DOI is rendered by prefixing https://doi.org/, and a record that had already stored the prefixed form would render https://doi.org/https://doi.org/10.…. Doi::new accepts either spelling and stores the bare one, so the prefix is applied exactly once no matter which form was written down.

What is stored is the identifier, not a URL

The value held here is the DOI name itself, raw: 10.1234/a#b is a DOI whose suffix contains a literal #. It is never the percent-encoded form. Doi::url applies that encoding on the way out, and Doi::new undoes it when the input arrived as a resolver URL, so the two are inverses and Doi::new(d.url()) returns d.

Stating it that way round is what keeps the type coherent. The alternative — storing the encoded form — makes Doi::as_str not the identifier but a fragment of a URL, and leaves no way to tell a DOI containing a literal % from one whose % opens an escape. Recording what the thing is and transforming at the boundary is the same rule GivenName follows.

Implementations

impl Doi

pub fn new(text: &str) -> Result<Self, NotADoi>

Parse a DOI, accepting the bare form, a doi: prefix, or a https://doi.org/ (or http://, or dx.doi.org) resolver URL.

The shape checked is the one the DOI Handbook defines: a 10. prefix, a registrant code of digits (possibly dot-separated, as in 10.1000.10/123), a /, and a non-empty suffix all of whose characters are printable (is_doi_name_char). That is deliberately stricter than “starts with 10. and contains a slash”, because everything this type accepts is rendered as a resolver link — and a link that resolves to nothing is exactly the plausible-looking citation this module exists to prevent. Beyond the shape it cannot go: whether a well-formed DOI is registered is a question only the network answers, and this crate has no network by construction.

Errors

Returns NotADoi when what remains after the prefix is not that shape.

pub fn as_str(&self) -> &str

The bare DOI, with no resolver prefix.

pub fn url(&self) -> String

The DOI as APA renders it: https://doi.org/10.….

The identifier is percent-encoded on the way in, because a DOI may legitimately contain characters that mean something else inside a URL. The sharpest is #: concatenated raw, 10.1234/a#b becomes https://doi.org/10.1234/a#b, whose #b is an HTTP fragment and is never sent to the resolver — so the link retrieves 10.1234/a, a different record, silently and with every appearance of working. ? opens a query string and does the same; a bare % invalidates the escape sequence it looks like.

Encoded rather than refused, and the reason is evidence rather than taste: 10.1002/(SICI)1097-0258(19970815)16:15<1707::AID-SIM605>3.0.CO;2-Y is a real registered DOI, and <, >, (, ; and : are ordinary in the wild. A suffix rule narrow enough to be URL-safe by construction would refuse identifiers that exist, which is a worse failure than encoding them. Doi::as_str still returns the DOI exactly as recorded — this is a transport encoding applied where the transport is, the same kind of operation as applying the resolver prefix, and for the same reason it is applied exactly once.

What passes through unescaped is RFC 3986’s pchar (is_url_path_safe), plus /; everything else becomes %XX. Byte by byte, so a multi-byte character is encoded as the bytes a URL actually carries.

Trait Implementations

impl Clone for Doi

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Doi

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Doi

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Doi

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Doi

impl From<Doi> for String

fn from(doi: Doi) -> Self

Converts to this type from the input type.

impl Ord for Doi

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for Doi

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for Doi

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for Doi

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Doi

impl TryFrom<String> for Doi

type Error = NotADoi

The type returned in the event of a conversion error.

fn try_from(text: String) -> Result<Self, Self::Error>

Performs the conversion.