All files / src/utils parser.js

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const Promise = require('bluebird');
const _ = require('lodash');
const util = require('util');
 
let dseDriver;
try {
  // eslint-disable-next-line import/no-extraneous-dependencies, import/no-unresolved
  dseDriver = require('dse-driver');
} catch (e) {
  dseDriver = null;
}
 
const cql = Promise.promisifyAll(dseDriver || require('cassandra-driver'));
 
const buildError = require('../orm/apollo_error.js');
const datatypes = require('../validators/datatypes');
const schemer = require('../validators/schema');
 
const parser = {};
 
parser.callback_or_throw = function f(err, callback) {
  Eif (typeof callback === 'function') {
    callback(err);
    return;
  }
  throw (err);
};
 
parser.extract_type = function f(val) {
  // decompose composite types
  const decomposed = val ? val.replace(/[\s]/g, '').split(/[<,>]/g) : [''];
 
  for (let d = 0; d < decomposed.length; d++) {
    Eif (_.has(datatypes, decomposed[d])) {
      return decomposed[d];
    }
  }
 
  return val;
};
 
parser.extract_typeDef = function f(val) {
  // decompose composite types
  let decomposed = val ? val.replace(/[\s]/g, '') : '';
  decomposed = decomposed.substr(decomposed.indexOf('<'), decomposed.length - decomposed.indexOf('<'));
 
  return decomposed;
};
 
parser.extract_altered_type = function f(normalizedModelSchema, diff) {
  const fieldName = diff.path[0];
  let type = '';
  if (diff.path.length > 1) {
    if (diff.path[1] === 'type') {
      type = diff.rhs;
      if (normalizedModelSchema.fields[fieldName].typeDef) {
        type += normalizedModelSchema.fields[fieldName].typeDef;
      }
    } else {
      type = normalizedModelSchema.fields[fieldName].type;
      type += diff.rhs;
    }
  } else {
    type = diff.rhs.type;
    if (diff.rhs.typeDef) type += diff.rhs.typeDef;
  }
  return type;
};
 
parser.get_db_value_expression = function f(schema, fieldName, fieldValue) {
  if (fieldValue == null || fieldValue === cql.types.unset) {
    return { query_segment: '?', parameter: fieldValue };
  }
 
  if (_.isPlainObject(fieldValue) && fieldValue.$db_function) {
    return fieldValue.$db_function;
  }
 
  const fieldType = schemer.get_field_type(schema, fieldName);
  const validators = schemer.get_validators(schema, fieldName);
 
  if (_.isArray(fieldValue) && fieldType !== 'list' && fieldType !== 'set' && fieldType !== 'frozen') {
    const val = fieldValue.map((v) => {
      const dbVal = parser.get_db_value_expression(schema, fieldName, v);
 
      Eif (_.isPlainObject(dbVal) && dbVal.query_segment) return dbVal.parameter;
      return dbVal;
    });
 
    return { query_segment: '?', parameter: val };
  }
 
  const validationMessage = schemer.get_validation_message(validators, fieldValue);
  if (typeof validationMessage === 'function') {
    throw (buildError('model.validator.invalidvalue', validationMessage(fieldValue, fieldName, fieldType)));
  }
 
  if (fieldType === 'counter') {
    let counterQuerySegment = util.format('"%s"', fieldName);
    if (fieldValue >= 0) counterQuerySegment += ' + ?';
    else counterQuerySegment += ' - ?';
    fieldValue = Math.abs(fieldValue);
    return { query_segment: counterQuerySegment, parameter: fieldValue };
  }
 
  return { query_segment: '?', parameter: fieldValue };
};
 
parser.unset_not_allowed = function f(operation, schema, fieldName, callback) {
  Iif (schemer.is_primary_key_field(schema, fieldName)) {
    parser.callback_or_throw(buildError(`model.${operation}.unsetkey`, fieldName), callback);
    return true;
  }
  if (schemer.is_required_field(schema, fieldName)) {
    parser.callback_or_throw(buildError(`model.${operation}.unsetrequired`, fieldName), callback);
    return true;
  }
  return false;
};
 
parser.get_inplace_update_expression = function f(schema, fieldName, fieldValue, updateClauses, queryParams) {
  const $add = (_.isPlainObject(fieldValue) && fieldValue.$add) || false;
  const $append = (_.isPlainObject(fieldValue) && fieldValue.$append) || false;
  const $prepend = (_.isPlainObject(fieldValue) && fieldValue.$prepend) || false;
  const $replace = (_.isPlainObject(fieldValue) && fieldValue.$replace) || false;
  const $remove = (_.isPlainObject(fieldValue) && fieldValue.$remove) || false;
 
  fieldValue = $add || $append || $prepend || $replace || $remove || fieldValue;
 
  const dbVal = parser.get_db_value_expression(schema, fieldName, fieldValue);
 
  if (!_.isPlainObject(dbVal) || !dbVal.query_segment) {
    updateClauses.push(util.format('"%s"=%s', fieldName, dbVal));
    return;
  }
 
  const fieldType = schemer.get_field_type(schema, fieldName);
 
  if (['map', 'list', 'set'].includes(fieldType)) {
    if ($add || $append) {
      dbVal.query_segment = util.format('"%s" + %s', fieldName, dbVal.query_segment);
    } else if ($prepend) {
      Eif (fieldType === 'list') {
        dbVal.query_segment = util.format('%s + "%s"', dbVal.query_segment, fieldName);
      } else {
        throw (buildError(
          'model.update.invalidprependop',
          util.format('%s datatypes does not support $prepend, use $add instead', fieldType),
        ));
      }
    } else if ($remove) {
      dbVal.query_segment = util.format('"%s" - %s', fieldName, dbVal.query_segment);
      if (fieldType === 'map') dbVal.parameter = Object.keys(dbVal.parameter);
    }
  }
 
  if ($replace) {
    if (fieldType === 'map') {
      updateClauses.push(util.format('"%s"[?]=%s', fieldName, dbVal.query_segment));
      const replaceKeys = Object.keys(dbVal.parameter);
      const replaceValues = _.values(dbVal.parameter);
      Eif (replaceKeys.length === 1) {
        queryParams.push(replaceKeys[0]);
        queryParams.push(replaceValues[0]);
      } else {
        throw (
          buildError('model.update.invalidreplaceop', '$replace in map does not support more than one item')
        );
      }
    } else Eif (fieldType === 'list') {
      updateClauses.push(util.format('"%s"[?]=%s', fieldName, dbVal.query_segment));
      Eif (dbVal.parameter.length === 2) {
        queryParams.push(dbVal.parameter[0]);
        queryParams.push(dbVal.parameter[1]);
      } else {
        throw (buildError(
          'model.update.invalidreplaceop',
          '$replace in list should have exactly 2 items, first one as the index and the second one as the value',
        ));
      }
    } else {
      throw (buildError(
        'model.update.invalidreplaceop',
        util.format('%s datatypes does not support $replace', fieldType),
      ));
    }
  } else {
    updateClauses.push(util.format('"%s"=%s', fieldName, dbVal.query_segment));
    queryParams.push(dbVal.parameter);
  }
};
 
parser.get_update_value_expression = function f(instance, schema, updateValues, callback) {
  const updateClauses = [];
  const queryParams = [];
 
  if (schema.options && schema.options.timestamps) {
    Eif (!updateValues[schema.options.timestamps.updatedAt]) {
      updateValues[schema.options.timestamps.updatedAt] = { $db_function: 'toTimestamp(now())' };
    }
  }
 
  if (schema.options && schema.options.versions) {
    Eif (!updateValues[schema.options.versions.key]) {
      updateValues[schema.options.versions.key] = { $db_function: 'now()' };
    }
  }
 
  const errorHappened = Object.keys(updateValues).some((fieldName) => {
    Iif (schema.fields[fieldName] === undefined || schema.fields[fieldName].virtual) return false;
 
    const fieldType = schemer.get_field_type(schema, fieldName);
    let fieldValue = updateValues[fieldName];
 
    Iif (fieldValue === undefined) {
      fieldValue = instance._get_default_value(fieldName);
      if (fieldValue === undefined) {
        return parser.unset_not_allowed('update', schema, fieldName, callback);
      } else if (!schema.fields[fieldName].rule || !schema.fields[fieldName].rule.ignore_default) {
        // did set a default value, ignore default is not set
        if (instance.validate(fieldName, fieldValue) !== true) {
          parser.callback_or_throw(buildError('model.update.invaliddefaultvalue', fieldValue, fieldName, fieldType), callback);
          return true;
        }
      }
    }
 
    if (fieldValue === null || fieldValue === cql.types.unset) {
      Iif (parser.unset_not_allowed('update', schema, fieldName, callback)) {
        return true;
      }
    }
 
    try {
      parser.get_inplace_update_expression(schema, fieldName, fieldValue, updateClauses, queryParams);
    } catch (e) {
      parser.callback_or_throw(e, callback);
      return true;
    }
    return false;
  });
 
  return { updateClauses, queryParams, errorHappened };
};
 
parser.get_save_value_expression = function fn(instance, schema, callback) {
  const identifiers = [];
  const values = [];
  const queryParams = [];
 
  if (schema.options && schema.options.timestamps) {
    if (instance[schema.options.timestamps.updatedAt]) {
      instance[schema.options.timestamps.updatedAt] = { $db_function: 'toTimestamp(now())' };
    }
  }
 
  if (schema.options && schema.options.versions) {
    if (instance[schema.options.versions.key]) {
      instance[schema.options.versions.key] = { $db_function: 'now()' };
    }
  }
 
  const errorHappened = Object.keys(schema.fields).some((fieldName) => {
    if (schema.fields[fieldName].virtual) return false;
 
    // check field value
    const fieldType = schemer.get_field_type(schema, fieldName);
    let fieldValue = instance[fieldName];
 
    if (fieldValue === undefined) {
      fieldValue = instance._get_default_value(fieldName);
      if (fieldValue === undefined) {
        return parser.unset_not_allowed('save', schema, fieldName, callback);
      } else Eif (!schema.fields[fieldName].rule || !schema.fields[fieldName].rule.ignore_default) {
        // did set a default value, ignore default is not set
        Iif (instance.validate(fieldName, fieldValue) !== true) {
          parser.callback_or_throw(buildError('model.save.invaliddefaultvalue', fieldValue, fieldName, fieldType), callback);
          return true;
        }
      }
    }
 
    if (fieldValue === null || fieldValue === cql.types.unset) {
      Iif (parser.unset_not_allowed('save', schema, fieldName, callback)) {
        return true;
      }
    }
 
    identifiers.push(util.format('"%s"', fieldName));
 
    try {
      const dbVal = parser.get_db_value_expression(schema, fieldName, fieldValue);
      if (_.isPlainObject(dbVal) && dbVal.query_segment) {
        values.push(dbVal.query_segment);
        queryParams.push(dbVal.parameter);
      } else {
        values.push(dbVal);
      }
    } catch (e) {
      parser.callback_or_throw(e, callback);
      return true;
    }
    return false;
  });
 
  return {
    identifiers,
    values,
    queryParams,
    errorHappened,
  };
};
 
parser.extract_query_relations = function f(fieldName, relationKey, relationValue, schema, validOperators) {
  const queryRelations = [];
  const queryParams = [];
 
  Iif (!_.has(validOperators, relationKey.toLowerCase())) {
    throw (buildError('model.find.invalidop', relationKey));
  }
 
  relationKey = relationKey.toLowerCase();
  Iif (relationKey === '$in' && !_.isArray(relationValue)) {
    throw (buildError('model.find.invalidinop'));
  }
  Iif (relationKey === '$token' && !(relationValue instanceof Object)) {
    throw (buildError('model.find.invalidtoken'));
  }
 
  let operator = validOperators[relationKey];
  let whereTemplate = '"%s" %s %s';
 
  const buildQueryRelations = (fieldNameLocal, relationValueLocal) => {
    const dbVal = parser.get_db_value_expression(schema, fieldNameLocal, relationValueLocal);
    Eif (_.isPlainObject(dbVal) && dbVal.query_segment) {
      queryRelations.push(util.format(
        whereTemplate,
        fieldNameLocal, operator, dbVal.query_segment,
      ));
      queryParams.push(dbVal.parameter);
    } else {
      queryRelations.push(util.format(
        whereTemplate,
        fieldNameLocal, operator, dbVal,
      ));
    }
  };
 
  const buildTokenQueryRelations = (tokenRelationKey, tokenRelationValue) => {
    tokenRelationKey = tokenRelationKey.toLowerCase();
    Eif (_.has(validOperators, tokenRelationKey) && tokenRelationKey !== '$token' && tokenRelationKey !== '$in') {
      operator = validOperators[tokenRelationKey];
    } else {
      throw (buildError('model.find.invalidtokenop', tokenRelationKey));
    }
 
    if (_.isArray(tokenRelationValue)) {
      const tokenKeys = fieldName.split(',');
      for (let tokenIndex = 0; tokenIndex < tokenRelationValue.length; tokenIndex++) {
        tokenKeys[tokenIndex] = tokenKeys[tokenIndex].trim();
        const dbVal = parser.get_db_value_expression(schema, tokenKeys[tokenIndex], tokenRelationValue[tokenIndex]);
        Eif (_.isPlainObject(dbVal) && dbVal.query_segment) {
          tokenRelationValue[tokenIndex] = dbVal.query_segment;
          queryParams.push(dbVal.parameter);
        } else {
          tokenRelationValue[tokenIndex] = dbVal;
        }
      }
      queryRelations.push(util.format(
        whereTemplate,
        tokenKeys.join('","'), operator, tokenRelationValue.toString(),
      ));
    } else {
      buildQueryRelations(fieldName, tokenRelationValue);
    }
  };
 
  if (relationKey === '$token') {
    whereTemplate = 'token("%s") %s token(%s)';
 
    const tokenRelationKeys = Object.keys(relationValue);
    for (let tokenRK = 0; tokenRK < tokenRelationKeys.length; tokenRK++) {
      const tokenRelationKey = tokenRelationKeys[tokenRK];
      const tokenRelationValue = relationValue[tokenRelationKey];
      buildTokenQueryRelations(tokenRelationKey, tokenRelationValue);
    }
  } else if (relationKey === '$contains') {
    const fieldType1 = schemer.get_field_type(schema, fieldName);
    Eif (['map', 'list', 'set', 'frozen'].includes(fieldType1)) {
      if (fieldType1 === 'map' && _.isPlainObject(relationValue)) {
        Object.keys(relationValue).forEach((key) => {
          queryRelations.push(util.format(
            '"%s"[%s] %s %s',
            fieldName, '?', '=', '?',
          ));
          queryParams.push(key);
          queryParams.push(relationValue[key]);
        });
      } else {
        queryRelations.push(util.format(
          whereTemplate,
          fieldName, operator, '?',
        ));
        queryParams.push(relationValue);
      }
    } else {
      throw (buildError('model.find.invalidcontainsop'));
    }
  } else if (relationKey === '$contains_key') {
    const fieldType2 = schemer.get_field_type(schema, fieldName);
    Iif (fieldType2 !== 'map') {
      throw (buildError('model.find.invalidcontainskeyop'));
    }
    queryRelations.push(util.format(
      whereTemplate,
      fieldName, operator, '?',
    ));
    queryParams.push(relationValue);
  } else {
    buildQueryRelations(fieldName, relationValue);
  }
  return { queryRelations, queryParams };
};
 
parser._parse_query_object = function f(schema, queryObject) {
  let queryRelations = [];
  let queryParams = [];
 
  Object.keys(queryObject).forEach((fieldName) => {
    if (fieldName.startsWith('$')) {
      // search queries based on lucene index or solr
      // escape all single quotes for queries in cassandra
      Iif (fieldName === '$expr') {
        if (typeof queryObject[fieldName].index === 'string' && typeof queryObject[fieldName].query === 'string') {
          queryRelations.push(util.format(
            "expr(%s,'%s')",
            queryObject[fieldName].index, queryObject[fieldName].query.replace(/'/g, "''"),
          ));
        } else {
          throw (buildError('model.find.invalidexpr'));
        }
      } else Iif (fieldName === '$solr_query') {
        if (typeof queryObject[fieldName] === 'string') {
          queryRelations.push(util.format(
            "solr_query='%s'",
            queryObject[fieldName].replace(/'/g, "''"),
          ));
        } else {
          throw (buildError('model.find.invalidsolrquery'));
        }
      }
      return;
    }
 
    let whereObject = queryObject[fieldName];
    // Array of operators
    Eif (!_.isArray(whereObject)) whereObject = [whereObject];
 
    for (let fk = 0; fk < whereObject.length; fk++) {
      let fieldRelation = whereObject[fk];
 
      const cqlOperators = {
        $eq: '=',
        $ne: '!=',
        $isnt: 'IS NOT',
        $gt: '>',
        $lt: '<',
        $gte: '>=',
        $lte: '<=',
        $in: 'IN',
        $like: 'LIKE',
        $token: 'token',
        $contains: 'CONTAINS',
        $contains_key: 'CONTAINS KEY',
      };
 
      if (_.isPlainObject(fieldRelation)) {
        const validKeys = Object.keys(cqlOperators);
        const fieldRelationKeys = Object.keys(fieldRelation);
        for (let i = 0; i < fieldRelationKeys.length; i++) {
          if (!validKeys.includes(fieldRelationKeys[i])) {
            // field relation key invalid, apply default $eq operator
            fieldRelation = { $eq: fieldRelation };
            break;
          }
        }
      } else {
        fieldRelation = { $eq: fieldRelation };
      }
 
      const relationKeys = Object.keys(fieldRelation);
      for (let rk = 0; rk < relationKeys.length; rk++) {
        const relationKey = relationKeys[rk];
        const relationValue = fieldRelation[relationKey];
        const extractedRelations = parser.extract_query_relations(
          fieldName,
          relationKey,
          relationValue,
          schema,
          cqlOperators,
        );
        queryRelations = queryRelations.concat(extractedRelations.queryRelations);
        queryParams = queryParams.concat(extractedRelations.queryParams);
      }
    }
  });
 
  return { queryRelations, queryParams };
};
 
parser.get_filter_clause = function f(schema, queryObject, clause) {
  const parsedObject = parser._parse_query_object(schema, queryObject);
  const filterClause = {};
  if (parsedObject.queryRelations.length > 0) {
    filterClause.query = util.format('%s %s', clause, parsedObject.queryRelations.join(' AND '));
  } else {
    filterClause.query = '';
  }
  filterClause.params = parsedObject.queryParams;
  return filterClause;
};
 
parser.get_filter_clause_ddl = function f(schema, queryObject, clause) {
  const filterClause = parser.get_filter_clause(schema, queryObject, clause);
  let filterQuery = filterClause.query;
  filterClause.params.forEach((param) => {
    let queryParam;
    Iif (typeof param === 'string') {
      queryParam = util.format("'%s'", param);
    } else Iif (param instanceof Date) {
      queryParam = util.format("'%s'", param.toISOString());
    } else Iif (param instanceof cql.types.Long
      || param instanceof cql.types.Integer
      || param instanceof cql.types.BigDecimal
      || param instanceof cql.types.TimeUuid
      || param instanceof cql.types.Uuid) {
      queryParam = param.toString();
    } else Iif (param instanceof cql.types.LocalDate
      || param instanceof cql.types.LocalTime
      || param instanceof cql.types.InetAddress) {
      queryParam = util.format("'%s'", param.toString());
    } else {
      queryParam = param;
    }
    // TODO: unhandled if queryParam is a string containing ? character
    // though this is unlikely to have in materialized view filters, but...
    filterQuery = filterQuery.replace('?', queryParam);
  });
  return filterQuery;
};
 
parser.get_where_clause = function f(schema, queryObject) {
  return parser.get_filter_clause(schema, queryObject, 'WHERE');
};
 
parser.get_if_clause = function f(schema, queryObject) {
  return parser.get_filter_clause(schema, queryObject, 'IF');
};
 
parser.get_primary_key_clauses = function f(schema) {
  const partitionKey = schema.key[0];
  let clusteringKey = schema.key.slice(1, schema.key.length);
  const clusteringOrder = [];
 
  for (let field = 0; field < clusteringKey.length; field++) {
    if (schema.clustering_order
        && schema.clustering_order[clusteringKey[field]]
        && schema.clustering_order[clusteringKey[field]].toLowerCase() === 'desc') {
      clusteringOrder.push(util.format('"%s" DESC', clusteringKey[field]));
    } else {
      clusteringOrder.push(util.format('"%s" ASC', clusteringKey[field]));
    }
  }
 
  let clusteringOrderClause = '';
  Eif (clusteringOrder.length > 0) {
    clusteringOrderClause = util.format(' WITH CLUSTERING ORDER BY (%s)', clusteringOrder.toString());
  }
 
  let partitionKeyClause = '';
  Eif (_.isArray(partitionKey)) {
    partitionKeyClause = partitionKey.map((v) => util.format('"%s"', v)).join(',');
  } else {
    partitionKeyClause = util.format('"%s"', partitionKey);
  }
 
  let clusteringKeyClause = '';
  Eif (clusteringKey.length) {
    clusteringKey = clusteringKey.map((v) => util.format('"%s"', v)).join(',');
    clusteringKeyClause = util.format(',%s', clusteringKey);
  }
 
  return { partitionKeyClause, clusteringKeyClause, clusteringOrderClause };
};
 
parser.get_mview_where_clause = function f(schema, viewSchema) {
  const clauses = parser.get_primary_key_clauses(viewSchema);
  let whereClause = clauses.partitionKeyClause.split(',').join(' IS NOT NULL AND ');
  Eif (clauses.clusteringKeyClause) whereClause += clauses.clusteringKeyClause.split(',').join(' IS NOT NULL AND ');
  whereClause += ' IS NOT NULL';
 
  const filters = _.cloneDeep(viewSchema.filters);
 
  if (_.isPlainObject(filters)) {
    // delete primary key fields defined as isn't null in filters
    Object.keys(filters).forEach((filterKey) => {
      if (filters[filterKey].$isnt === null
          && (viewSchema.key.includes(filterKey) || viewSchema.key[0].includes(filterKey))) {
        delete filters[filterKey].$isnt;
      }
    });
 
    const filterClause = parser.get_filter_clause_ddl(schema, filters, 'AND');
    whereClause += util.format(' %s', filterClause).replace(/IS NOT null/g, 'IS NOT NULL');
  }
 
  // remove unnecessarily quoted field names in generated where clause
  // so that it matches the where_clause from database schema
  const quotedFieldNames = whereClause.match(/"(.*?)"/g);
  quotedFieldNames.forEach((fieldName) => {
    const unquotedFieldName = fieldName.replace(/"/g, '');
    const reservedKeywords = [
      'ADD', 'AGGREGATE', 'ALLOW', 'ALTER', 'AND', 'ANY', 'APPLY',
      'ASC', 'AUTHORIZE', 'BATCH', 'BEGIN', 'BY', 'COLUMNFAMILY',
      'CREATE', 'DELETE', 'DESC', 'DROP', 'EACH_QUORUM', 'ENTRIES',
      'FROM', 'FULL', 'GRANT', 'IF', 'IN', 'INDEX', 'INET', 'INFINITY',
      'INSERT', 'INTO', 'KEYSPACE', 'KEYSPACES', 'LIMIT', 'LOCAL_ONE',
      'LOCAL_QUORUM', 'MATERIALIZED', 'MODIFY', 'NAN', 'NORECURSIVE',
      'NOT', 'OF', 'ON', 'ONE', 'ORDER', 'PARTITION', 'PASSWORD', 'PER',
      'PRIMARY', 'QUORUM', 'RENAME', 'REVOKE', 'SCHEMA', 'SELECT', 'SET',
      'TABLE', 'TIME', 'THREE', 'TO', 'TOKEN', 'TRUNCATE', 'TWO', 'UNLOGGED',
      'UPDATE', 'USE', 'USING', 'VIEW', 'WHERE', 'WITH'];
    if (unquotedFieldName === unquotedFieldName.toLowerCase()
      && !reservedKeywords.includes(unquotedFieldName.toUpperCase())) {
      whereClause = whereClause.replace(fieldName, unquotedFieldName);
    }
  });
  return whereClause;
};
 
parser.get_orderby_clause = function f(queryObject) {
  const orderKeys = [];
  Object.keys(queryObject).forEach((k) => {
    const queryItem = queryObject[k];
    if (k.toLowerCase() === '$orderby') {
      Iif (!(queryItem instanceof Object)) {
        throw (buildError('model.find.invalidorder'));
      }
      const orderItemKeys = Object.keys(queryItem);
 
      for (let i = 0; i < orderItemKeys.length; i++) {
        const cqlOrderDirection = { $asc: 'ASC', $desc: 'DESC' };
        Eif (orderItemKeys[i].toLowerCase() in cqlOrderDirection) {
          let orderFields = queryItem[orderItemKeys[i]];
 
          Eif (!_.isArray(orderFields)) {
            orderFields = [orderFields];
          }
 
          for (let j = 0; j < orderFields.length; j++) {
            orderKeys.push(util.format(
              '"%s" %s',
              orderFields[j], cqlOrderDirection[orderItemKeys[i]],
            ));
          }
        } else {
          throw (buildError('model.find.invalidordertype', orderItemKeys[i]));
        }
      }
    }
  });
  return orderKeys.length ? util.format('ORDER BY %s', orderKeys.join(', ')) : ' ';
};
 
parser.get_limit_clause = function f(queryObject) {
  let limit = null;
  Object.keys(queryObject).forEach((k) => {
    const queryItem = queryObject[k];
    if (k.toLowerCase() === '$limit') {
      Iif (typeof queryItem !== 'number') throw (buildError('model.find.limittype'));
      limit = queryItem;
    }
  });
  return limit ? util.format('LIMIT %s', limit) : ' ';
};
 
parser.get_select_clause = function f(options) {
  let selectClause = '*';
  if (options.select && _.isArray(options.select) && options.select.length > 0) {
    const selectArray = [];
    for (let i = 0; i < options.select.length; i++) {
      // separate the aggregate function and the column name if select is an aggregate function
      const selection = options.select[i].split(/[(, )]/g).filter((e) => (e));
      if (selection.length === 1) {
        Iif (selection[0] === '*') selectArray.push('*');
        else selectArray.push(util.format('"%s"', selection[0]));
      } else if (selection.length === 2) {
        selectArray.push(util.format('%s("%s")', selection[0], selection[1]));
      } else if (selection.length >= 3 && selection[selection.length - 2].toLowerCase() === 'as') {
        const selectionEndChunk = selection.splice(selection.length - 2);
        let selectionChunk = '';
        if (selection.length === 1) {
          selectionChunk = util.format('"%s"', selection[0]);
        } else if (selection.length === 2) {
          selectionChunk = util.format('%s("%s")', selection[0], selection[1]);
        } else {
          selectionChunk = util.format('%s(%s)', selection[0], `"${selection.splice(1).join('","')}"`);
        }
        selectArray.push(util.format('%s AS "%s"', selectionChunk, selectionEndChunk[1]));
      } else Eif (selection.length >= 3) {
        selectArray.push(util.format('%s(%s)', selection[0], `"${selection.splice(1).join('","')}"`));
      }
    }
    selectClause = selectArray.join(',');
  }
  return selectClause;
};
 
module.exports = parser;