Enum SpanExpression 

pub enum SpanExpression {
    SpanTerm {
        field: String,
        value: String,
    },
    SpanNear {
        field: String,
        terms: Vec<String>,
        slop: u32,
        in_order: bool,
    },
    SpanNot {
        include: Box<SpanExpression>,
        exclude: Box<SpanExpression>,
    },
    SpanFirst {
        query: Box<SpanExpression>,
        end: u32,
    },
}

Span-typed expression — the subset of queries that yield (doc, start, end) span tuples and can be composed by span operators (SpanFirst, SpanNot, SpanNear).

The parser produces this type for span_first.match and span_not.include / exclude, so the AST makes it unrepresentable to place a non-span query inside a span composition operator — the mistake would require constructing an invalid enum variant, which doesn’t type-check. This replaces runtime dispatch and default-trait-error rejection in the engine.

Variants

SpanTerm

Single term with position awareness.

Fields

field: String

value: String

SpanNear

Terms within slop positions, optionally ordered.

Fields

field: String

terms: Vec<String>

slop: u32

in_order: bool

SpanNot

Include spans minus exclude spans (doc-level overlap in Luci).

Fields

include: Box<SpanExpression>

exclude: Box<SpanExpression>

SpanFirst

Spans ending at position ≤ end.

Fields

query: Box<SpanExpression>

end: u32

Trait Implementations

impl Clone for SpanExpression

fn clone(&self) -> SpanExpression

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SpanExpression

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

Formats the value using the given formatter.

impl PartialEq for SpanExpression

fn eq(&self, other: &SpanExpression) -> 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 StructuralPartialEq for SpanExpression