Enum Predicate 

pub enum Predicate {
    Contains {
        capture: u32,
        values: Vec<String>,
    },
    Ancestor {
        capture: u32,
        kinds: Vec<String>,
        parent: bool,
        negative: bool,
    },
    Offset {
        capture: u32,
        offsets: [isize; 4],
    },
}

A compiled custom predicate or capture-offset directive.

Variants

Contains

Require captured text to contain at least one literal.

Fields

capture: u32

Capture index to inspect or adjust.

values: Vec<String>

Literal substrings to search for.

Ancestor

Test parent or ancestor node kinds, optionally negating the result.

Fields

capture: u32

Capture index to inspect or adjust.

kinds: Vec<String>

Node kinds that satisfy the structural test.

parent: bool

Inspect only the immediate parent when true.

negative: bool

Accept when no inspected node matches a kind.

Offset

Adjust capture boundaries by row and byte-column offsets.

Fields

capture: u32

Capture index to inspect or adjust.

offsets: [isize; 4]

Start row/column and end row/column adjustments, in that order.

Implementations

impl Predicate

pub fn compile(operator: &str, arguments: Vec<Argument>) -> Result<Self, Error>

Compile a custom-predicate operator and literal arguments.

Errors

Returns Error::Query for unsupported operators or malformed arguments.

pub fn accepts(&self, matched: &Match, source: &str) -> bool

Test all matching captures before applying offsets.

A predicate with no matching captures is accepted. Offset directives do not filter matches. Self::apply adjusts their ranges.

pub fn apply(&self, matched: &mut Match, source: &str) -> Result<(), Error>

Apply offset directives to matching captures. Other predicates do nothing.

Errors

Returns Error::InvalidRange when an offset leaves the source or splits a UTF-8 character.