Enum Value 

#[non_exhaustive]
pub enum Value {
    Null,
    Bool(bool),
    Number(f64),
    Text(String),
    Date(DateTime),
}

A value: what fields hold and expressions compute.

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

No value (a missing field, a JSON null).

Bool(bool)

True or false.

Number(f64)

A number.

Text(String)

Text.

Date(DateTime)

A date and time.

Implementations

impl Value

pub fn from_json(json: &Value) -> Self

Converts a JSON scalar; arrays and objects become Null (they are collections, reached with [Items][].Sum(...)).

pub fn is_null(&self) -> bool

True for Null.

pub fn as_number(&self) -> Option<f64>

The value as a number: numbers, booleans (1/0) and numeric text.

pub fn as_date(&self) -> Option<DateTime>

The value as a date: dates and ISO 8601 text.

pub fn is_true(&self) -> bool

Truthiness for conditions: true, non-zero numbers and non-empty text.

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

Orders values for sorting and comparisons: nulls first, then by kind; numbers numerically, text case-insensitively, dates chronologically.

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

Equality as the = operator sees it (1 = '1' is false, 1 = 1.0 is true).

pub fn to_text(&self) -> String

Text for display without a format: numbers in invariant form.

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 Default for Value

fn default() -> Value

Returns the “default value” for a type.

impl From<&str> for Value

fn from(s: &str) -> Self

Converts to this type from the input type.

impl From<DateTime> for Value

fn from(d: DateTime) -> 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(n: f64) -> Self

Converts to this type from the input type.

impl From<i64> for Value

fn from(n: i64) -> Self

Converts to this type from the input type.

impl PartialEq for Value

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Value