moment-of-symmetry/dist/src/hardness.js

Moment of Symmetry (MOS) musical scale generation and analysis for Javascript

const HARDNESS_RATIOS = [
    ['equalized', 1, 1],
    ['supersoft', 4, 3],
    ['soft', 3, 2],
    ['semisoft', 5, 3],
    ['basic', 2, 1],
    ['semihard', 5, 2],
    ['hard', 3, 1],
    ['superhard', 4, 1],
    ['collapsed', 1, 0],
];
const HARDNESS_RANGES = [
    ['ultrasoft', 6, 8],
    ['parasoft', 8, 9],
    ['quasisoft', 9, 10],
    ['minisoft', 10, 12],
    ['minihard', 12, 15],
    ['quasihard', 15, 18],
    ['parahard', 18, 24],
    ['ultrahard', 24, Infinity],
];
/**
 * Get the TAMNAMS name for a step ratio L:s.
 * @param sizeOfLargeStep Size of the large step.
 * @param sizeOfSmallStep Size of the small step.
 * @returns Name of the step ratio or the name of the hardness range it belongs to.
 */
export function getHardness(sizeOfLargeStep, sizeOfSmallStep) {
    // Non-standard
    if (!sizeOfLargeStep && !sizeOfSmallStep) {
        return 'stationary';
    }
    const sign = sizeOfLargeStep * sizeOfSmallStep;
    let l = Math.abs(sizeOfLargeStep);
    let s = Math.abs(sizeOfSmallStep);
    let prefix = '';
    // Standard
    if (s > l) {
        prefix = 'anti-' + prefix;
        [l, s] = [s, l];
    }
    // Non-standard
    if (sign < 0) {
        prefix = 'trans-' + prefix;
    }
    for (let i = 0; i < HARDNESS_RATIOS.length; ++i) {
        const [name, large, small] = HARDNESS_RATIOS[i];
        if (l * small === large * s) {
            return prefix + name;
        }
    }
    for (let i = 0; i < HARDNESS_RANGES.length; ++i) {
        const [name, low, high] = HARDNESS_RANGES[i];
        if (low * s < 6 * l && 6 * l < high * s) {
            return prefix + name;
        }
    }
    throw new Error('Unable to determine hardness');
}
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