Struct Pattern 

pub struct Pattern<'a>(/* private fields */);

A pattern: a sequence of parts with no empty Text and no two adjacent Text parts (Pattern::push merges and drops accordingly).

The representation stores one part inline, so a placeholder-free message needs no allocation (the D1 target).

Implementations

impl<'a> Pattern<'a>

pub const fn new() -> Self

The empty pattern (does not allocate).

pub fn with_capacity(capacity: usize) -> Self

An empty pattern with room for capacity parts: no allocation for 0 or 1 part, one allocation of exactly capacity parts otherwise.

pub fn from_text(text: Cow<'a, str>) -> Self

The pattern holding just text; "" gives the empty pattern. Does not allocate.

pub fn push(&mut self, part: PatternPart<'a>)

Appends part: an empty Text is dropped, and a Text after a Text is merged into it (which makes the merged text owned).

pub fn parts(&self) -> &[PatternPart<'a>]

The parts, in order.

pub fn iter(&self) -> Iter<'_, PatternPart<'a>>

Iterates over the parts, in order.

pub fn len(&self) -> usize

How many parts.

pub fn is_empty(&self) -> bool

No parts.

pub fn as_simple_text(&self) -> Option<&str>

Some for the empty pattern ("") and for a pattern that is a single Text part; None if it has a placeholder.

pub fn into_parts(self) -> Vec<PatternPart<'a>>

The parts as a vector (allocates unless the pattern already holds one).

pub fn into_owned(self) -> Pattern<'static>

The same pattern with every string owned.

Trait Implementations

impl<'a> Clone for Pattern<'a>

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 Pattern<'_>

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

Formats the value using the given formatter.

impl<'a> Default for Pattern<'a>

fn default() -> Self

Returns the “default value” for a type.

impl<'de: 'a, 'a> Deserialize<'de> for Pattern<'a>

Available on crate feature serde only.

fn deserialize<D: Deserializer<'de>>(d: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

impl Eq for Pattern<'_>

impl<'a> From<Vec<PatternPart<'a>>> for Pattern<'a>

fn from(parts: Vec<PatternPart<'a>>) -> Self

Keeps the vector’s allocation when it already satisfies the pattern invariants (no empty or adjacent Text); otherwise normalizes.

impl<'a> FromIterator<PatternPart<'a>> for Pattern<'a>

fn from_iter<I: IntoIterator<Item = PatternPart<'a>>>(iter: I) -> Self

Creates a value from an iterator.

impl Hash for Pattern<'_>

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'p, 'a> IntoIterator for &'p Pattern<'a>

type Item = &'p PatternPart<'a>

The type of the elements being iterated over.

type IntoIter = Iter<'p, PatternPart<'a>>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl PartialEq for Pattern<'_>

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for Pattern<'_>

Available on crate feature serde only.

fn serialize<S: Serializer>(&self, s: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.