Add chirality information for every scale (iss #23)

README.md

@@ -12,6 +12,7 @@ A microtonal scale research app chiefly dedicated to ternary scales (scales with
 1. Visit `http://localhost:8080/` with your browser. Your browser must support WebAssembly; all major browsers should.
 
 # Dev scripts
+
 1. `npm run build`: Build the app
 2. `npm run serve`: Deploy the app on a development server.
 3. `npm run format`: Run `prettier` on all HTML, CSS, JavaScript, and TypeScript files.

index.js

@@ -17,6 +17,7 @@ let currentTuning = null;
 let currentProfile = null;
 
 const statusElement = document.getElementById("status");
+
 function displayStepVector(vector) {
   const keys = [...Object.keys(vector)];
   const sizeIdentifiers = ["L", "M", "s"];
@@ -497,6 +498,11 @@ stack()`
           ) {
             el.innerHTML += `None<br/>`;
           }
+          if (currentProfile["chirality"] === "Achiral") {
+            el.innerHTML += `<br/>Chirality: Achiral`;
+          } else {
+            el.innerHTML += `<br/>Chirality: ${currentProfile["chirality"]} (reversed: ${currentProfile["reversed"]})`;
+          }
           el.innerHTML += `<br/>Maximum variety ${currentProfile["mv"]}</small>`;
         }
       }

src/lib.rs

@@ -14,9 +14,8 @@ pub mod words;
 
 use itertools::Itertools;
 use wasm_bindgen::prelude::*;
-use words::countvector_to_slice;
-use words::dyad_on_degree;
-use words::Letter;
+use words::{chirality, countvector_to_slice, dyad_on_degree};
+use words::{Chirality, Letter};
 
 #[wasm_bindgen]
 extern "C" {
@@ -96,6 +95,10 @@ pub struct ScaleProfile {
     word: String,
     /// unimodular basis for lattice is there is one
     lattice_basis: Option<Vec<Vec<u8>>>,
+    /// chirality
+    chirality: Chirality,
+    /// brightest mode of reversed word
+    reversed: String,
     /// lowest-complexity guide frame structure provided there is one
     structure: Option<GuideResult>,
     /// whether scale is L=M monotone MOS
@@ -305,6 +308,9 @@ pub fn word_to_profile(query: &[usize]) -> ScaleProfile {
     let lm = monotone_lm(query);
     let ms = monotone_ms(query);
     let s0 = monotone_s0(query);
+    let chirality = chirality(query);
+    let reversed = least_mode(& query.iter().copied().rev().collect::<Vec<usize>>());
+    let reversed = numbers_to_string(&reversed);
     let mv = maximum_variety(query) as u8;
     let step_sig = word_to_sig(query)
         .iter()
@@ -319,6 +325,8 @@ pub fn word_to_profile(query: &[usize]) -> ScaleProfile {
         ScaleProfile {
             word: brightest,
             lattice_basis: Some(lattice_basis),
+            chirality,
+            reversed,
             structure: Some(structure),
             lm,
             ms,
@@ -329,6 +337,8 @@ pub fn word_to_profile(query: &[usize]) -> ScaleProfile {
         ScaleProfile {
             word: brightest,
             lattice_basis: None,
+            chirality,
+            reversed,
             structure: None,
             lm,
             ms,

src/words.rs

@@ -1,4 +1,5 @@
 use itertools::Itertools;
+use serde::Serialize;
 use std::cmp::{max, Ordering};
 use std::collections::{BTreeMap, BTreeSet, HashSet};
 use std::hash::Hash;
@@ -35,7 +36,7 @@ impl Subtendable for CountVector<Letter> {
 }
 
 /// The [chirality](https://en.xen.wiki/w/Chirality) of a scale.
-#[derive(Copy, Clone, Debug, Hash, PartialEq)]
+#[derive(Copy, Clone, Debug, Hash, PartialEq, Serialize)]
 pub enum Chirality {
     /// Lexicographically first mode is greater than that of reversed scale word.
     Left,