calculateLayerDomain()

in src/layers/base-layer.js [912:956]
33 lines of code
10 McCabe index (conditional complexity)

  calculateLayerDomain(dataset, visualChannel) {
    const {allData, filteredIndexForDomain} = dataset;
    const defaultDomain = [0, 1];
    const {scale} = visualChannel;
    const scaleType = this.config[scale];

    const field = this.config[visualChannel.field];
    if (!field) {
      // if colorField or sizeField were set back to null
      return defaultDomain;
    }

    if (!SCALE_TYPES[scaleType]) {
      Console.error(`scale type ${scaleType} not supported`);
      return defaultDomain;
    }

    // TODO: refactor to add valueAccessor to field
    const fieldIdx = field.tableFieldIndex - 1;
    const isTime = field.type === ALL_FIELD_TYPES.timestamp;
    const valueAccessor = maybeToDate.bind(null, isTime, fieldIdx, field.format);
    const indexValueAccessor = i => valueAccessor(allData[i]);

    const sortFunction = getSortingFunction(field.type);

    switch (scaleType) {
      case SCALE_TYPES.ordinal:
      case SCALE_TYPES.point:
        // do not recalculate ordinal domain based on filtered data
        // don't need to update ordinal domain every time
        return getOrdinalDomain(allData, valueAccessor);

      case SCALE_TYPES.quantile:
        return getQuantileDomain(filteredIndexForDomain, indexValueAccessor, sortFunction);

      case SCALE_TYPES.log:
        return getLogDomain(filteredIndexForDomain, indexValueAccessor);

      case SCALE_TYPES.quantize:
      case SCALE_TYPES.linear:
      case SCALE_TYPES.sqrt:
      default:
        return getLinearDomain(filteredIndexForDomain, indexValueAccessor);
    }
  }