Function detectSourceFormat

_benchmarks/sample_echarts.js:19841–19875

* Note: An empty array will be detected as `SOURCE_FORMAT_ARRAY_ROWS`.

(data)

    function detectSourceFormat(data) {
      var sourceFormat = SOURCE_FORMAT_UNKNOWN;

      if (isTypedArray(data)) {
        sourceFormat = SOURCE_FORMAT_TYPED_ARRAY;
      } else if (isArray(data)) {
        // FIXME Whether tolerate null in top level array?
        if (data.length === 0) {
          sourceFormat = SOURCE_FORMAT_ARRAY_ROWS;
        }

        for (var i = 0, len = data.length; i < len; i++) {
          var item = data[i];

          if (item == null) {
            continue;
          } else if (isArray(item)) {
            sourceFormat = SOURCE_FORMAT_ARRAY_ROWS;
            break;
          } else if (isObject(item)) {
            sourceFormat = SOURCE_FORMAT_OBJECT_ROWS;
            break;
          }
        }
      } else if (isObject(data)) {
        for (var key in data) {
          if (hasOwn(data, key) && isArrayLike(data[key])) {
            sourceFormat = SOURCE_FORMAT_KEYED_COLUMNS;
            break;
          }
        }
      }

      return sourceFormat;
    }
    /**
     * Determine the source definitions from data standalone dimensions definitions
     * are not specified.