fusible 0.4.0

Electronic linter: a fuse that blows to block firmware code generation
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//! Aperture definitions and deduplication dictionary for Gerber RS-274X.

use std::collections::HashMap;
use std::fmt::Write as FmtWrite;

/// Aperture geometry types supported in RS-274X standard template definitions.
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum Aperture {
    Circle { diameter_nm: i64 },
    Rectangle { width_nm: i64, height_nm: i64 },
    Obround { width_nm: i64, height_nm: i64 },
}

/// An aperture dictionary that allocates contiguous D-codes starting at D10.
#[derive(Debug, Default)]
pub struct ApertureDictionary {
    map: HashMap<Aperture, u32>,
    ordered: Vec<(u32, Aperture)>,
    next_id: u32,
}

impl ApertureDictionary {
    /// Creates a new empty dictionary starting at D-code 10.
    pub fn new() -> Self {
        Self {
            map: HashMap::new(),
            ordered: Vec::new(),
            next_id: 10,
        }
    }

    /// Interns an aperture and returns its unique D-code.
    pub fn intern(&mut self, aperture: Aperture) -> u32 {
        if let Some(&id) = self.map.get(&aperture) {
            return id;
        }
        let id = self.next_id;
        self.next_id += 1;
        self.map.insert(aperture.clone(), id);
        self.ordered.push((id, aperture));
        id
    }

    /// Emits all aperture definition commands (%ADD...*%).
    pub fn write_definitions(&self, out: &mut String) {
        for (id, ap) in &self.ordered {
            match ap {
                Aperture::Circle { diameter_nm } => {
                    let d = *diameter_nm as f64 / 1_000_000.0;
                    let _ = writeln!(out, "%ADD{id}C,{:.6}*%", d);
                }
                Aperture::Rectangle {
                    width_nm,
                    height_nm,
                } => {
                    let w = *width_nm as f64 / 1_000_000.0;
                    let h = *height_nm as f64 / 1_000_000.0;
                    let _ = writeln!(out, "%ADD{id}R,{:.6}X{:.6}*%", w, h);
                }
                Aperture::Obround {
                    width_nm,
                    height_nm,
                } => {
                    let w = *width_nm as f64 / 1_000_000.0;
                    let h = *height_nm as f64 / 1_000_000.0;
                    let _ = writeln!(out, "%ADD{id}O,{:.6}X{:.6}*%", w, h);
                }
            }
        }
    }
}