Enum Value 

#[non_exhaustive]
pub enum Value {
    Null,
    Boolean(bool),
    Integer(i64),
    Float(f64),
    Text(String),
}

A scalar value held inside a StoreEntry::Var.

Value is the narrow, concrete set of primitive types the pipeline understands: nothing, booleans, 64-bit integers, 64-bit floats, and owned text. Collections are represented by StoreEntry::Array and StoreEntry::Map, not by additional Value variants. The enum is marked #[non_exhaustive] so future scalar additions do not break external match statements.

The as_* accessors narrow to a specific variant for callers that know what they are holding; each returns an AccessError::TypeMismatch on the wrong variant. Use Value::get_type to inspect the type tag without narrowing.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Null

The absent value.

Boolean(bool)

A boolean.

Integer(i64)

A 64-bit signed integer.

Float(f64)

A 64-bit floating-point number.

Text(String)

An owned UTF-8 string.

Implementations

impl Value

pub fn as_text(&self) -> Result<&str, AccessError>

Narrows to a Text, returning a borrowed string slice. Fails with AccessError::TypeMismatch otherwise.

pub fn as_integer(&self) -> Result<i64, AccessError>

Narrows to an Integer. Fails with AccessError::TypeMismatch otherwise.

pub fn as_float(&self) -> Result<f64, AccessError>

Narrows to a Float. Fails with AccessError::TypeMismatch otherwise.

pub fn as_boolean(&self) -> Result<bool, AccessError>

Narrows to a Boolean. Fails with AccessError::TypeMismatch otherwise.

pub fn as_null(&self) -> Result<(), AccessError>

Asserts the value is Null. Fails with AccessError::TypeMismatch otherwise.

impl Value

pub fn get_type(&self) -> Type

Returns the Type tag that corresponds to this value.

Trait Implementations

impl Clone for Value

fn clone(&self) -> Value

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Value

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

Formats the value using the given formatter.

impl Display for Value

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

Formats the value using the given formatter.

impl From<&Value> for StoreEntry

fn from(v: &Value) -> Self

Converts to this type from the input type.

impl From<&str> for Value

fn from(s: &str) -> Self

Converts to this type from the input type.

impl From<String> for Value

fn from(s: String) -> Self

Converts to this type from the input type.

impl From<bool> for Value

fn from(b: bool) -> Self

Converts to this type from the input type.

impl From<f64> for Value

fn from(f: f64) -> Self

Converts to this type from the input type.

impl From<i64> for Value

fn from(i: i64) -> Self

Converts to this type from the input type.

impl Hash for Value

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 PartialEq for Value

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Value

impl StructuralPartialEq for Value