macroonz-compiler 0.2.0

Deterministic Rust code generation for procedural macros: plan, render, close, explain, and bind one sealed expansion from declared input.
Documentation 
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//! The compiler-owned roster contracts and how a disposition-set completion refusal reads.

use super::types::{
    Answer, CanonicalContent, Destination, DispositionSetError, NoQuestions, Question, Role,
    SoleRole,
};
use crate::identity::encode_bytes;
use core::fmt;

/// One row's position in its roster, or the roster's length where the roster does not carry it.
pub(super) fn slot_in<T: Copy + Eq>(roster: &[T], row: T) -> u16 {
    let position = roster
        .iter()
        .position(|other| *other == row)
        .unwrap_or(roster.len());
    u16::try_from(position).unwrap_or(u16::MAX)
}

/// Find one roster row by the name its declaration assigned it.
pub(crate) fn roster_row<Row: Copy>(
    roster: &[Row],
    name: fn(Row) -> &'static str,
    sought: &str,
) -> Option<Row> {
    roster.iter().copied().find(|row| name(*row) == sought)
}

impl CanonicalContent for () {
    fn encode_content_into(&self, _into: &mut Vec<u8>) {}
}

impl CanonicalContent for &'static str {
    fn encode_content_into(&self, into: &mut Vec<u8>) {
        encode_bytes(self.as_bytes(), into);
    }
}

impl Role for SoleRole {
    const ALL: &'static [Self] = &[Self::Sole];

    fn name(self) -> &'static str {
        "sole"
    }

    fn destination(self) -> Destination {
        Destination::DeclarationSite
    }
}

impl Question for NoQuestions {
    const ALL: &'static [Self] = &[];

    type Answer = Self;

    fn name(self) -> &'static str {
        match self {}
    }
}

impl Answer for NoQuestions {
    type Question = Self;

    fn question(&self) -> Self {
        match *self {}
    }

    fn encode_into(&self, _into: &mut Vec<u8>) {
        match *self {}
    }

    fn human(&self) -> String {
        match *self {}
    }
}

impl fmt::Display for DispositionSetError {
    fn fmt(&self, into: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::CountMismatch { expected, observed } => write!(
                into,
                "the kind set declares {expected} names but its disposition record surrendered {observed} rows"
            ),
            Self::KindMismatch { expected, observed } => write!(
                into,
                "the kind set declares `{expected}` at this position but its disposition record surrendered `{observed}`"
            ),
        }
    }
}

impl core::error::Error for DispositionSetError {}