all files / modules/utils/ parseMediaValue.js

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/**
 * Parses a media value string including parameters and returns an object
 * containing the type, subtype, and an object of parameters.
 *
 *   parseMediaValue("text/html;level=2;q=0.4") =>
 *     { type: 'text',
 *       subtype: 'html',
 *       params: { level: '2', q: '0.4' } }
 *
 *   parseMediaValue("en-gb;q=0.8", "-") =>
 *     { type: 'en',
 *       subtype: 'gb',
 *       params: { q: '0.8' } }
 *
 *   parseMediaValue("unicode-1-1;q=0.8") =>
 *     { type: 'unicode-1-1',
 *       subtype: undefined,
 *       params: { q: '0.8' } }
 */
function parseMediaValue(value, typeSeparator) {
    typeSeparator = typeSeparator || "/";
 
    const parts = value.split(/\s*;\s*/);
    const mediaTypes = parts.shift().split(typeSeparator, 2);
    const params = parts.reduce(function (memo, part) {
        const nameValue = part.split("=", 2);
        memo[nameValue[0]] = nameValue[1];
        return memo;
    }, {});
 
    return {
        type: mediaTypes[0],
        subtype: mediaTypes[1],
        params
    };
}
 
module.exports = parseMediaValue;