Struct Expr 

pub struct Expr {
    root: Node,
}

A compiled condition expression in APISIX’s triple-array form.

Parsed once at config load (Expr::parse); regexes are compiled at parse time so evaluation is allocation-light.

Fields

root: Node

Implementations

impl Expr

pub fn parse(v: &Value) -> Result<Self, String>

Parses the APISIX vars shape: a JSON array of rules, ANDed.

Each rule is [var, op, value], [var, "!", op, value], or a nested ["AND"|"OR", rule...]. Fails with a descriptive message on unknown operators, malformed rules, invalid regexes, or invalid CIDRs.

pub fn references_response_body(&self) -> bool

Evaluates the expression against the context. Rules referencing absent variables evaluate as if the variable were the empty string, except ipmatch, which is false for an absent/unparsable address. JSONPath subjects match zero nodes (rule is false) when the body is empty or not valid JSON. Whether evaluating this expression reads context.response.body.

Consulted at policy-compile time by the nodes that gate on a condition (traffic-label’s matchers, response-rewrite’s vars): a condition on the response body makes the node a body reader even though none of its other config touches the body, so the node must not report itself stream-safe.

pub fn eval(&self, ctx: &Context) -> bool

Trait Implementations

impl Debug for Expr

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

Formats the value using the given formatter.