Function normalizeSymbolArray

_benchmarks/sample_echarts.js:27398–27431

* Convert symbol array into normalized array * * @param {string | (string | string[])[]} symbol symbol input * @return {string[][]} normolized symbol array

(symbol)

     */

    function normalizeSymbolArray(symbol) {
      if (!symbol || symbol.length === 0) {
        return [['rect']];
      }

      if (typeof symbol === 'string') {
        return [[symbol]];
      }

      var isAllString = true;

      for (var i = 0; i < symbol.length; ++i) {
        if (typeof symbol[i] !== 'string') {
          isAllString = false;
          break;
        }
      }

      if (isAllString) {
        return normalizeSymbolArray([symbol]);
      }

      var result = [];

      for (var i = 0; i < symbol.length; ++i) {
        if (typeof symbol[i] === 'string') {
          result.push([symbol[i]]);
        } else {
          result.push(symbol[i]);
        }
      }

      return result;
    }
    /**
     * Convert dash input into dashArray
     *