sim-lib-numbers-signal 0.1.0

Deterministic transforms, autoregression, spectral estimation, and guarded signal operations.
Documentation 
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// conformance: checked Lisp signal operations and finite diagnostic evidence.

use std::sync::Arc;

use sim_codec::{Input, decode_eval_expr_with_codec, encode_value_with_codec};
use sim_codec_lisp::LispCodecLib;
use sim_kernel::{
    CapabilitySet, DefaultFactory, EagerPolicy, EncodeOptions, ReadPolicy, Symbol, TrustLevel,
};

use crate::{RECIPES, SignalNumbersLib};

fn cx() -> sim_kernel::Cx {
    let mut cx = sim_kernel::Cx::new(Arc::new(EagerPolicy), Arc::new(DefaultFactory));
    cx.load_lib(&sim_lib_numbers_f64::F64NumbersLib::new())
        .unwrap();
    cx.load_lib(&SignalNumbersLib::new()).unwrap();
    let lisp = LispCodecLib::new(cx.registry_mut().fresh_codec_id()).unwrap();
    cx.load_lib(&lisp).unwrap();
    cx
}

#[test]
fn lisp_surface_runs_an_impulse_fft() {
    let mut cx = cx();
    let recipes = sim_cookbook::recipes_from_embedded(RECIPES).unwrap();
    let recipe = recipes
        .iter()
        .find(|recipe| recipe.id.ends_with("/impulse-fft"))
        .unwrap();
    let expr = decode_eval_expr_with_codec(
        &mut cx,
        &Symbol::qualified("codec", "lisp"),
        Input::Text(String::from_utf8(recipe.setup.clone()).unwrap()),
        ReadPolicy {
            trust: TrustLevel::TrustedSource,
            capabilities: CapabilitySet::new(),
        },
    )
    .unwrap();
    let output = cx.eval_expr(expr).unwrap();
    let encoded = encode_value_with_codec(
        &mut cx,
        &Symbol::qualified("codec", "lisp"),
        &output,
        EncodeOptions::default(),
    )
    .unwrap()
    .into_text()
    .unwrap();
    assert_eq!(recipe.expect.len(), 1);
    assert_eq!(recipe.expect[0].form, 0);
    assert_eq!(encoded, "((1 0) (1 0) (1 0) (1 0))");
}

#[test]
fn lisp_surface_exposes_costed_convolution_and_guarded_deconvolution() {
    let mut cx = cx();
    let recipes = sim_cookbook::recipes_from_embedded(RECIPES).unwrap();
    let recipe = recipes
        .iter()
        .find(|recipe| recipe.id.ends_with("/convolution-evidence"))
        .unwrap();
    let convolution = eval_lisp(&mut cx, &String::from_utf8(recipe.setup.clone()).unwrap());
    assert_eq!(
        convolution,
        "(expr:map [algorithm direct] [direct-cost-units 6] [fft-cost-units 40] [fft-len 4] [retained-len 4] [retained-start 0] [samples (1 1 1 -3)])"
    );
    assert!(convolution.contains("algorithm direct"), "{convolution}");
    assert!(convolution.contains("samples (1 1 1 -3)"), "{convolution}");
    assert!(convolution.contains("direct-cost-units 6"), "{convolution}");

    let deconvolution = eval_lisp(
        &mut cx,
        "(signal/deconvolve [1.0 -1.0 0.0] [1.0 -1.0] :regularization {:kind 'tikhonov :lambda 1e-8})",
    );
    assert!(
        deconvolution.contains("regularization tikhonov"),
        "{deconvolution}"
    );
    assert!(
        deconvolution.contains("singular-bins (0)"),
        "{deconvolution}"
    );
    assert!(!deconvolution.contains("inf"), "{deconvolution}");
    assert!(!deconvolution.contains("NaN"), "{deconvolution}");
}

#[test]
fn lisp_surface_exposes_burg_and_unitary_dft_interpolation_evidence() {
    let mut cx = cx();
    let interpolation = eval_lisp(
        &mut cx,
        "(signal/dft-interpolate [[2.0 0.0] [0.0 0.0] [0.0 0.0] [0.0 0.0]] :at '(0.125 0.375) :normalization 'unitary)",
    );
    assert!(
        interpolation.contains("values ((1 0) (1 0))"),
        "{interpolation}"
    );
    assert!(
        interpolation.contains("normalization unitary"),
        "{interpolation}"
    );
    assert!(
        interpolation.contains("periodicity wrap"),
        "{interpolation}"
    );
    assert!(
        interpolation.contains("endpoint excluded"),
        "{interpolation}"
    );

    let burg = eval_lisp(
        &mut cx,
        "(signal/burg [0.0 0.2 0.31 0.28 0.12 -0.08 -0.21 -0.19 -0.05 0.13 0.24 0.2] :order 2 :criterion 'fixed :stability 'reject)",
    );
    assert!(burg.contains("effective-order 2"), "{burg}");
    assert!(burg.contains("criterion fixed"), "{burg}");
    assert!(burg.contains("termination requested-order"), "{burg}");
    assert!(burg.contains("residual-energy"), "{burg}");
    assert!(!burg.contains("NaN"), "{burg}");
    assert!(!burg.contains("inf"), "{burg}");
}

fn eval_lisp(cx: &mut sim_kernel::Cx, source: &str) -> String {
    let expr = decode_eval_expr_with_codec(
        cx,
        &Symbol::qualified("codec", "lisp"),
        Input::Text(source.to_owned()),
        ReadPolicy {
            trust: TrustLevel::TrustedSource,
            capabilities: CapabilitySet::new(),
        },
    )
    .unwrap();
    let output = cx.eval_expr(expr).unwrap();
    encode_value_with_codec(
        cx,
        &Symbol::qualified("codec", "lisp"),
        &output,
        EncodeOptions::default(),
    )
    .unwrap()
    .into_text()
    .unwrap()
}