Enum Directive 

pub enum Directive<'a> {
    LoadTime {
        prefix: &'a str,
        body: &'a str,
    },
    Deferred {
        id: &'a str,
        path: &'a str,
    },
}

Classification of a ${...} directive body. This is the single rule shared by load-time interpolation, record-time interpolation, and matrix validation (expand.rs) so they can never disagree about what a token means (#78/#39).

A load-time directive uses a colon (${env:VAR}, ${file:./p}); a deferred reference uses a dot or nothing (${users.id}, ${row}). The colon is checked first, so ${env.foo} (no colon) is a deferred reference to id env, not a malformed load-time env directive — both the validator and the runtime now treat it identically.

Variants

LoadTime

Prefixed directive like ${env:VAR} or ${file:./p} — split on :.

Fields

prefix: &'a str

body: &'a str

Deferred

No : — a ${id.dotted.path} reference deferred to runtime. id is the text before the first .; path is the (possibly empty) rest.

Fields

id: &'a str

path: &'a str