PronounsPage/shared/language/morphemes.ts

import { capitalise } from '#shared/helpers.ts';

export const getBaseMorpheme = (morpheme: string): string => {
    return morpheme.replace(/^'/, '');
};

export const toMorphemeValue = (value: MorphemeValue | string): MorphemeValue => {
    if (typeof value === 'string') {
        return { spelling: value };
    }
    return value;
};

export interface MorphemeValue {
    /**
     * spelling (grapheme)
     */
    spelling: string;
    /**
     * pronunciation (phoneme), can be:
     * `string` starting with `=`, meaning that it should be pronounced like a word part in the respective language
     * `string`, meaning it should be pronounced according to IPA
     * `undefined` or absent, meaning that it should be pronounced like `spelling` in the respective language
     * `false`, meaning it is unpronounceable
     */
    pronunciation?: string | false;
}

export class MorphemeValues {
    private readonly values: Record<string, MorphemeValue | undefined>;

    constructor(values: Record<string, MorphemeValue | string | undefined>) {
        this.values = Object.fromEntries(Object.entries(values)
            .map(([morpheme, value]) => [morpheme, value !== undefined ? toMorphemeValue(value) : undefined]));
    }

    getSpelling(morpheme: string): string | undefined {
        let capital = false;
        if (morpheme.startsWith('\'')) {
            capital = true;
            morpheme = morpheme.substring(1);
        }

        const value = this.values[morpheme];
        if (value === undefined) {
            return undefined;
        }

        return capital ? capitalise(value.spelling) : value.spelling;
    }

    getPronunciation(morpheme: string): string | false | undefined {
        return this.values[morpheme]?.pronunciation;
    }
}