toRdf.js

// original file https://raw.githubusercontent.com/w3c/wot-thing-description/main/context/toRDF.js
const fs = require('fs');

const ld = 'http://www.w3.org/ns/json-ld#';
const a = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type';

function fullIRI(curie, ctx) {
    let capture = /^(\w+):(\w+)$/.exec(curie);

    if (capture) {
        let [str, ns, name] = capture;
        if (ctx[ns]) return ctx[ns] + name;
        else console.warn('No mapping found for prefix ' + ns);
    }

    return curie;
}

function scopeName(id) {
    return id ? id.substring(id.indexOf('#') + 1) + "-" : ""; // TODO hash
}

function context(obj, id) {
    let ctx = obj['@context'];
    let scope = scopeName(id);

    if (!ctx) {
        return '';
    }

    let txt = `_:${scope}context <${a}> <${ld}Context> .\r\n`;

    if (ctx['@vocab']) {
        let vocab = fullIRI(ctx['@vocab'], ctx);
        txt += `_:${scope}context <${ld}vocab> <${vocab}> .\r\n`;
    }

    Object.entries(ctx)
        .filter(([k, v]) => !k.startsWith('@'))
        .map(([k, v]) => {
            txt += `_:${scope}context <${ld}definition> _:${scope}${k} .\r\n`;

            txt += `_:${scope}${k} <${a}> <${ld}Mapping> .\r\n`;
            txt += `_:${scope}${k} <${ld}term> "${k}" .\r\n`;

            let iri = fullIRI(v instanceof Object ? v['@id'] : v, ctx);
            if (!iri.startsWith('@')) {
                txt += `_:${scope}${k} <${ld}iri> <${iri}> .\r\n`;
            }

            if (v instanceof Object) {
                if (v['@container']) {
                    let container = v['@container'].replace('@', '');
                    txt += `_:${scope}${k} <${ld}container> <${ld + container}> .\r\n`;
                }

                if (v['@type']) {
                    let type = v['@type'];
                    if (type != '@id' && type != '@vocab') {
                        txt += `_:${scope}${k} <${ld}type> <${type}> .\r\n`;
                    }
                }

                if (v['@context']) {
                    txt += `_:${scope}${k} <${ld}context> _:${scopeName(iri)}context .\r\n`;
                    txt += context(v, iri);
                }
            }
        });

    return txt;
}


module.exports = {
    context
}