Enum Condition 

pub enum Condition {
    Has(String),
    Equals {
        field: String,
        value: String,
    },
    Not(Box<Condition>),
    AllOf(Vec<Condition>),
    AnyOf(Vec<Condition>),
}

A condition a document’s metadata must satisfy.

Variants

Has(String)

The field is present and carries at least one non-empty value.

“Present” means usable, not merely written: a people: with an empty string under it has nothing to group or display, and a view that included it would be showing a row it cannot say anything about.

Equals

The field carries this value — any element of it, for a sequence, so equals: { people: Ada } matches a document listing several people.

Fields

field: String

The field to read.

value: String

The value it must carry, compared as text.

Not(Box<Condition>)

The inverse of the condition it wraps.

AllOf(Vec<Condition>)

Every condition must hold. An empty list holds vacuously, which is what makes it the identity a multi-key mapping folds into.

AnyOf(Vec<Condition>)

At least one condition must hold. An empty list holds for nothing, so a any-of: [] selects nothing rather than everything — the reading that cannot silently publish a whole workspace.

Implementations

impl Condition

pub fn matches(&self, meta: &Value) -> bool

Whether meta satisfies this condition.

pub fn parse(value: &Value) -> Option<Self>

Read a where: block.

Returns None for a value that is not a mapping, or one that yields no condition at all — an empty where: is not a filter that excludes everything, it is a view that did not say anything, and treating it as the former would hide a whole workspace behind a typo.

pub fn to_value(&self) -> Value

The mapping this condition writes back as.

Trait Implementations

impl Clone for Condition

fn clone(&self) -> Condition

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Condition

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

Formats the value using the given formatter.

impl Eq for Condition

impl PartialEq for Condition

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Condition