d3plus-common/es/src/parseSides.js

/**
 @function parseSides
 @desc Converts a string of directional CSS shorthand values into an object with the values expanded.
 @param {String|Number} sides The CSS shorthand string to expand.
 */
export default function(sides) {
  var values;
  if (typeof sides === "number") { values = [sides]; }
  else { values = sides.split(/\s+/); }

  if (values.length === 1) { values = [values[0], values[0], values[0], values[0]]; }
  else if (values.length === 2) { values = values.concat(values); }
  else if (values.length === 3) { values.push(values[1]); }

  return [
    "top",
    "right",
    "bottom",
    "left"
  ].reduce(function (acc, direction, i) {
    var value = parseFloat(values[i]);
    acc[direction] = value || 0;
    return acc;
  }, {});
}

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