Method runExpressionOnColumn

docs/tests/v2/es6/js/sanddance.js:153079–153135

(datum, ex)

  }

  runExpressionOnColumn(datum, ex) {
    const actualDataValue = datum[ex.name];

    if (ex.operator === 'isnullorEmpty') {
      return isnullorEmpty(actualDataValue);
    } else if (ex.operator === '!isnullorEmpty') {
      return !isnullorEmpty(actualDataValue);
    }

    let dataValue = actualDataValue;
    let expressionValue = ex.value;

    if (ex.column) {
      if (ex.column.type === 'string' || ex.stringOperation) {
        dataValue = valueToString(actualDataValue).toLocaleLowerCase();
        expressionValue = ex.valueLow;
      } else if (ex.column.type === 'boolean') {
        dataValue = valueToBoolean(actualDataValue);
        expressionValue = ex.valueBool;
      } else if (ex.column.quantitative) {
        dataValue = +actualDataValue;
        expressionValue = +ex.value;
      }
    }

    switch (ex.operator) {
      case '!=':
        return dataValue != expressionValue;

      case '<':
        return dataValue < expressionValue;

      case '<=':
        return dataValue <= expressionValue;

      case '==':
        return dataValue == expressionValue;

      case '>':
        return dataValue > expressionValue;

      case '>=':
        return dataValue >= expressionValue;

      case 'contains':
        return dataValue.indexOf(expressionValue) >= 0;

      case '!contains':
        return dataValue.indexOf(expressionValue) < 0;

      case 'starts':
        return dataValue.indexOf(expressionValue) == 0;

      case '!starts':
        return dataValue.indexOf(expressionValue) !== 0;
    }
  }