@teipublisher/pb-components/src/utils.js

Collection of webcomponents underlying TEI Publisher

export function resolveURL(relPath) {
  const src = document.querySelector('script[src*=pb-components]');
  if (src) {
    return new URL(relPath, src.src).href;
  }
  return new URL(relPath, window.location.href).href;
}

export function cmpVersion(a, b) {
  let i;
  let cmp;
  let len;
  a = `${a}`.split('.');
  b = `${b}`.split('.');
  len = Math.max(a.length, b.length);
  for (i = 0; i < len; i++) {
    if (a[i] === undefined) {
      a[i] = '0';
    }
    if (b[i] === undefined) {
      b[i] = '0';
    }
    cmp = parseInt(a[i], 10) - parseInt(b[i], 10);
    if (cmp !== 0) {
      return cmp < 0 ? -1 : 1;
    }
  }
  return 0;
}

export function minVersion(given, required) {
  return cmpVersion(given, required) >= 0;
}

/**
 * Retrieve value of a CSS property.
 *
 * @param {Element} elem the component
 * @param {string} name name of the property
 * @param {any} defaultValue default value
 * @returns the value or defaultValue if it does not exist
 */
export function getCSSProperty(elem, name, defaultValue) {
  const property = getComputedStyle(elem).getPropertyValue(name);
  if (property) {
    try {
      return JSON.parse(property);
    } catch (e) {
      return defaultValue;
    }
  }
  return defaultValue;
}